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fschutt/solidjs-dragdrop.public.html

Created November 12, 2025 09:03
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solidjs-dragdrop.public.html
<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Dynamisches ERP Formular</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="app"></div>
<script type="module">
import { createSignal, createEffect } from 'https://cdn.skypack.dev/solid-js';
import { createStore } from 'https://cdn.skypack.dev/solid-js/store';
const INITIAL_STATE = {
formTitle: "LEISTUNG FÜR ADEL, ALINA",
constants: {
services: [
{ id: "service_001", displayName: "Stuga FLS" },
{ id: "service_002", displayName: "Therapie" },
{ id: "service_003", displayName: "Beratung" },
{ id: "service_004", displayName: "Hausbesuch" }
],
activities: [
{ id: "activity_001", displayName: "Verwaltung" },
{ id: "activity_002", displayName: "Betreuung" },
{ id: "activity_003", displayName: "Dokumentation" }
],
locations: [
{ id: "location_001", displayName: "Büro" },
{ id: "location_002", displayName: "Klient Zuhause" },
{ id: "location_003", displayName: "Praxis" }
]
},
fields: [
{
key: "system.mitarbeiter",
type: "text",
label: "Mitarbeiter",
value: "Bredemeier, Syenja",
valueType: "raw",
required: true,
readonly: false,
visible: true,
isSystem: true,
order: 0
},
{
key: "system.klient",
type: "text",
label: "Klient",
value: "Adel, Alina",
valueType: "raw",
required: true,
readonly: false,
visible: true,
isSystem: true,
order: 1
},
{
key: "system.beginn",
type: "datetime-local",
label: "Beginn",
value: "2025-10-08T08:00",
valueType: "raw",
required: true,
readonly: false,
visible: true,
isSystem: true,
order: 2
},
{
key: "system.ende",
type: "datetime-local",
label: "Ende",
value: "2025-10-08T09:00",
valueType: "raw",
required: true,
readonly: false,
visible: true,
isSystem: true,
order: 3
},
{
key: "system.zeitraum",
type: "daterange",
label: "Zeitraum",
value: { start: "2025-10-08T08:00", end: "2025-10-08T09:00" },
valueType: "raw",
required: false,
readonly: false,
visible: false,
isSystem: true,
order: 4
},
{
key: "system.leistung",
type: "select",
label: "Leistung",
value: "service_001",
valueType: "constant",
constantKey: "services",
options: ["service_001", "service_002", "service_003", "service_004"],
required: true,
readonly: false,
visible: true,
isSystem: true,
order: 5
},
{
key: "system.stunden",
type: "number",
label: "Stunden",
value: 1.0,
valueType: "raw",
required: false,
readonly: true,
visible: true,
isSystem: true,
order: 6
},
{
key: "system.sitzungslaenge",
type: "number",
label: "Sitzungslänge (min)",
value: 60,
valueType: "raw",
required: false,
readonly: false,
visible: true,
isSystem: true,
order: 7,
visibleWhen: {
field: "system.leistung",
operator: "equals",
value: "service_002"
}
},
{
key: "system.anzahl_sitzungen",
type: "number",
label: "Anzahl Sitzungen",
value: 1,
valueType: "raw",
required: false,
readonly: true,
visible: true,
isSystem: true,
order: 8,
visibleWhen: {
field: "system.leistung",
operator: "equals",
value: "service_002"
}
},
{
key: "system.taetigkeit",
type: "select",
label: "Tätigkeit",
value: "",
valueType: "constant",
constantKey: "activities",
options: ["activity_001", "activity_002", "activity_003"],
required: false,
readonly: false,
visible: false,
isSystem: true,
order: 9,
visibleWhen: {
field: "system.leistung",
operator: "equals",
value: "service_003"
}
},
{
key: "system.einsatzort",
type: "select",
label: "Einsatzort",
value: "",
valueType: "constant",
constantKey: "locations",
options: ["location_001", "location_002", "location_003"],
required: false,
readonly: false,
visible: true,
isSystem: true,
order: 10
},
{
key: "system.pause",
type: "number",
label: "Pause",
value: 0.0,
valueType: "raw",
required: false,
readonly: true,
visible: true,
isSystem: true,
order: 11
},
{
key: "system.pause_automatisch",
type: "bool",
label: "automatisch",
value: true,
valueType: "raw",
required: false,
readonly: false,
visible: true,
isSystem: true,
order: 12
},
{
key: "system.kommentar",
type: "textarea",
label: "Kommentar",
value: "",
valueType: "raw",
required: false,
readonly: false,
visible: true,
isSystem: true,
order: 13
}
]
};
// SolidJS Reactive State
const [state, setState] = createStore(JSON.parse(JSON.stringify(INITIAL_STATE)));
const [draggedIndex, setDraggedIndex] = createSignal(null);
const [showJSON, setShowJSON] = createSignal(true);
const [showAdvanced, setShowAdvanced] = createSignal(false);
const [newFieldLabel, setNewFieldLabel] = createSignal("");
const [newFieldType, setNewFieldType] = createSignal("text");
const [newFieldDefault, setNewFieldDefault] = createSignal("");
const [parentField, setParentField] = createSignal("");
const [selectedValidators, setSelectedValidators] = createSignal([]);
const [enumValues, setEnumValues] = createSignal([{ id: "", displayName: "", indent: 0 }]);
const VALIDATORS = [
{ id: "readonly", label: "Readonly" },
{ id: "required", label: "Required" },
{ id: "non-negative", label: "Non-negative" },
{ id: "email", label: "Valid Email" },
{ id: "phone", label: "Valid Phone" },
{ id: "url", label: "Valid URL" },
{ id: "min-length", label: "Min Length" },
{ id: "max-length", label: "Max Length" }
];
// Hilfsfunktionen
const sortedFields = () => [...state.fields].sort((a, b) => a.order - b.order);
const evaluateVisibility = (field) => {
if (!field.visibleWhen) return true;
const sourceField = state.fields.find(f => f.key === field.visibleWhen.field);
if (!sourceField) return true;
switch (field.visibleWhen.operator) {
case "equals":
return sourceField.value === field.visibleWhen.value;
case "notEquals":
return sourceField.value !== field.visibleWhen.value;
case "contains":
return String(sourceField.value).includes(field.visibleWhen.value);
default:
return true;
}
};
const validateField = (field) => {
if (!field.validators) return true;
for (const validator of field.validators) {
switch (validator) {
case "non-negative":
if (field.type === "number" && field.value < 0) return false;
break;
case "email":
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
if (field.type === "text" && field.value && !emailRegex.test(field.value)) return false;
break;
case "phone":
const phoneRegex = /^[\d\s\-\+\(\)]+$/;
if (field.type === "text" && field.value && !phoneRegex.test(field.value)) return false;
break;
case "url":
try {
if (field.value) new URL(field.value);
} catch {
return false;
}
break;
}
}
return true;
};
const getFieldHierarchy = (key) => {
const parts = key.split('.');
if (parts[0] === 'user' && parts.length > 2) {
return parts.slice(1, -1).join(' › ') + ' › ';
}
return '';
};
const getFieldName = (key) => {
const parts = key.split('.');
return parts[parts.length - 1];
};
const calculateHours = () => {
const beginnField = state.fields.find(f => f.key === 'system.beginn');
const endeField = state.fields.find(f => f.key === 'system.ende');
if (beginnField?.value && endeField?.value) {
const beginn = new Date(beginnField.value);
const ende = new Date(endeField.value);
const diff = (ende - beginn) / (1000 * 60 * 60);
return Math.max(0, Number(diff.toFixed(2)));
}
return 0;
};
const calculateSessionCount = () => {
const stundenField = state.fields.find(f => f.key === 'system.stunden');
const sitzungslaengeField = state.fields.find(f => f.key === 'system.sitzungslaenge');
if (stundenField?.value && sitzungslaengeField?.value && sitzungslaengeField.value > 0) {
const totalMinutes = stundenField.value * 60;
const sessionLength = sitzungslaengeField.value;
const sessions = Math.floor(totalMinutes / sessionLength);
return Math.max(0, sessions);
}
return 0;
};
const updateFormTitle = () => {
const klientField = state.fields.find(f => f.key === 'system.klient');
if (klientField?.value) {
setState("formTitle", `LEISTUNG FÜR ${klientField.value.toUpperCase()}`);
const headerTitle = document.querySelector('.form-header h1');
if (headerTitle) {
headerTitle.textContent = state.formTitle;
}
}
};
const updateFieldValue = (key, value) => {
const fieldIndex = state.fields.findIndex(f => f.key === key);
if (fieldIndex !== -1) {
setState("fields", fieldIndex, "value", value);
console.log('Field updated:', {
key,
value,
fullState: JSON.parse(JSON.stringify(state))
});
// Abhängigkeit: Stunden neu berechnen
if (key === 'system.beginn' || key === 'system.ende') {
const stundenIndex = state.fields.findIndex(f => f.key === 'system.stunden');
if (stundenIndex !== -1) {
const newHours = calculateHours();
setState("fields", stundenIndex, "value", newHours);
// Auch Anzahl Sitzungen neu berechnen
const anzahlIndex = state.fields.findIndex(f => f.key === 'system.anzahl_sitzungen');
if (anzahlIndex !== -1) {
setState("fields", anzahlIndex, "value", calculateSessionCount());
}
}
}
// Abhängigkeit: Anzahl Sitzungen neu berechnen wenn Sitzungslänge sich ändert
if (key === 'system.sitzungslaenge') {
const anzahlIndex = state.fields.findIndex(f => f.key === 'system.anzahl_sitzungen');
if (anzahlIndex !== -1) {
const newCount = calculateSessionCount();
setState("fields", anzahlIndex, "value", newCount);
console.log('Session count recalculated:', {
newSessionLength: value,
totalHours: state.fields.find(f => f.key === 'system.stunden')?.value,
newSessionCount: newCount
});
}
}
// Formular-Titel aktualisieren wenn Klient sich ändert
if (key === 'system.klient') {
updateFormTitle();
}
// Visibility Dependencies neu evaluieren
state.fields.forEach((field, idx) => {
if (field.visibleWhen && field.visibleWhen.field === key) {
const newVisibility = evaluateVisibility(field);
setState("fields", idx, "visible", newVisibility);
console.log('Visibility dependency triggered:', {
targetField: field.key,
sourceField: key,
sourceValue: value,
newVisibility,
condition: field.visibleWhen
});
}
});
}
};
const handleDragStart = (index) => {
setDraggedIndex(index);
// Add dragging class to all rows
document.querySelectorAll('.field-row').forEach((row, idx) => {
if (idx === index) {
row.classList.add('dragging');
}
});
};
const handleDragOver = (index) => {
const dragIndex = draggedIndex();
if (dragIndex === null || dragIndex === index) return;
// Remove drag-over classes from all rows
document.querySelectorAll('.field-row').forEach(row => {
row.classList.remove('drag-over', 'drag-over-nested');
});
// Add drag-over class to target row
const rows = document.querySelectorAll('.field-row');
if (rows[index]) {
rows[index].classList.add('drag-over');
}
};
const handleDragOverNested = (index, event) => {
event.preventDefault();
event.stopPropagation();
const dragIndex = draggedIndex();
if (dragIndex === null || dragIndex === index) return;
// Remove drag-over classes from all rows
document.querySelectorAll('.field-row').forEach(row => {
row.classList.remove('drag-over', 'drag-over-nested');
});
// Add nested drag-over class to target row
const rows = document.querySelectorAll('.field-row');
if (rows[index]) {
rows[index].classList.add('drag-over-nested');
}
};
const handleDrop = (dropIndex, isNested = false) => {
const dragIndex = draggedIndex();
if (dragIndex === null || dragIndex === dropIndex) {
cleanupDragClasses();
return;
}
const fields = sortedFields();
const draggedField = fields[dragIndex];
const droppedField = fields[dropIndex];
// Get all fields that depend on the dragged field
const getDependentFields = (parentKey) => {
return state.fields.filter(f => f.visibleWhen && f.visibleWhen.field === parentKey);
};
const draggedDependents = getDependentFields(draggedField.key);
// Calculate new order values
const dragFieldIndex = state.fields.findIndex(f => f.key === draggedField.key);
const dropFieldIndex = state.fields.findIndex(f => f.key === droppedField.key);
if (isNested) {
// Set parent relationship
setState("fields", dragFieldIndex, "parentField", droppedField.key);
setState("fields", dragFieldIndex, "order", droppedField.order + 0.5);
console.log('Field nested under parent:', {
draggedKey: draggedField.key,
parentKey: droppedField.key
});
} else {
// Swap order values (normal drop)
const tempOrder = draggedField.order;
setState("fields", dragFieldIndex, "order", droppedField.order);
setState("fields", dropFieldIndex, "order", tempOrder);
// Clear parent relationship if dropping at root level
setState("fields", dragFieldIndex, "parentField", undefined);
}
// Move dependents to follow parent
if (draggedDependents.length > 0) {
const newParentOrder = isNested ? droppedField.order + 0.5 : droppedField.order;
draggedDependents.forEach((dependent, idx) => {
const depIndex = state.fields.findIndex(f => f.key === dependent.key);
setState("fields", depIndex, "order", newParentOrder + 0.1 * (idx + 1));
});
// Renormalize all orders to be integers
const sorted = sortedFields();
sorted.forEach((field, idx) => {
const fieldIndex = state.fields.findIndex(f => f.key === field.key);
setState("fields", fieldIndex, "order", idx);
});
}
console.log('Field reordered:', {
draggedKey: draggedField.key,
droppedKey: droppedField.key,
isNested,
dependents: draggedDependents.map(d => d.key)
});
setDraggedIndex(null);
cleanupDragClasses();
};
const handleDragEnd = () => {
cleanupDragClasses();
setDraggedIndex(null);
};
const cleanupDragClasses = () => {
document.querySelectorAll('.field-row').forEach(row => {
row.classList.remove('dragging', 'drag-over', 'drag-over-nested');
});
};
const deleteField = (key) => {
const field = state.fields.find(f => f.key === key);
if (field && !field.isSystem) {
setState("fields", state.fields.filter(f => f.key !== key));
}
};
// Generate key from label (e.g. "Mein Feld" -> "mein_feld")
const generateKeyFromLabel = (label) => {
return label
.toLowerCase()
.replace(/ä/g, 'ae')
.replace(/ö/g, 'oe')
.replace(/ü/g, 'ue')
.replace(/ß/g, 'ss')
.replace(/[^a-z0-9]+/g, '_')
.replace(/^_+|_+$/g, '');
};
// Generate UUID v4
const generateUUID = () => {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
const r = Math.random() * 16 | 0;
const v = c === 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
};
const addCustomField = () => {
const label = newFieldLabel().trim();
const type = newFieldType();
const defaultValue = newFieldDefault();
if (!label) {
alert("Bitte Feldname ausfüllen");
return;
}
// Generate key from label
const generatedKey = generateKeyFromLabel(label);
// Build full key (no parent hierarchy from dropdown anymore)
const fullKey = `user.${generatedKey}`;
if (state.fields.find(f => f.key === fullKey)) {
alert("Ein Feld mit diesem Key existiert bereits");
return;
}
// Get default value based on type
let finalValue;
if (type === "bool") {
finalValue = defaultValue === "true" || defaultValue === true;
} else if (type === "number") {
finalValue = parseFloat(defaultValue) || 0;
} else if (type === "datetime-local") {
// Default to now
const now = new Date();
const year = now.getFullYear();
const month = String(now.getMonth() + 1).padStart(2, '0');
const day = String(now.getDate()).padStart(2, '0');
const hours = String(now.getHours()).padStart(2, '0');
const minutes = String(now.getMinutes()).padStart(2, '0');
finalValue = `${year}-${month}-${day}T${hours}:${minutes}`;
} else if (type === "daterange") {
const now = new Date();
const year = now.getFullYear();
const month = String(now.getMonth() + 1).padStart(2, '0');
const day = String(now.getDate()).padStart(2, '0');
const hours = String(now.getHours()).padStart(2, '0');
const minutes = String(now.getMinutes()).padStart(2, '0');
const nowStr = `${year}-${month}-${day}T${hours}:${minutes}`;
finalValue = { start: nowStr, end: nowStr };
} else if (type === "select") {
// For select, get first enum value ID
const firstEnum = enumValues()[0];
finalValue = firstEnum?.id || "";
} else {
finalValue = defaultValue || "";
}
const newField = {
key: fullKey,
type,
label,
value: finalValue,
valueType: type === "select" ? "constant" : "raw",
constantKey: type === "select" ? fullKey : undefined,
required: selectedValidators().includes("required"),
readonly: selectedValidators().includes("readonly"),
visible: true,
isSystem: false,
order: state.fields.length,
options: type === "select" ? enumValues().map(e => e.id) : undefined,
validators: selectedValidators().filter(v => v !== "readonly" && v !== "required")
};
// If select type, add constants
if (type === "select") {
const constantsArray = enumValues().map(ev => ({
id: ev.id,
displayName: ev.displayName,
indent: ev.indent
}));
setState("constants", fullKey, constantsArray);
}
setState("fields", [...state.fields, newField]);
console.log('Custom field added:', newField);
// Reset form
setNewFieldLabel("");
setNewFieldType("text");
setNewFieldDefault("");
setParentField("");
setSelectedValidators([]);
setEnumValues([{ id: "", displayName: "", indent: 0 }]);
setShowAdvanced(false);
// Trigger UI update
renderAddFieldForm();
};
// DOM Rendering Funktionen
function createFieldInput(field) {
const container = document.createElement('div');
container.className = 'field-input';
const isValid = validateField(field);
let input;
switch (field.type) {
case "text":
input = document.createElement('input');
input.type = 'text';
input.value = field.value || '';
input.readOnly = field.readonly;
if (!isValid) input.classList.add('invalid');
input.addEventListener('change', (e) => {
updateFieldValue(field.key, e.target.value);
});
break;
case "number":
input = document.createElement('input');
input.type = 'number';
input.value = field.value || 0;
input.readOnly = field.readonly;
input.step = '0.01';
if (!isValid) input.classList.add('invalid');
input.addEventListener('change', (e) => {
updateFieldValue(field.key, parseFloat(e.target.value) || 0);
});
break;
case "datetime-local":
input = document.createElement('input');
input.type = 'datetime-local';
input.value = field.value || '';
input.readOnly = field.readonly;
input.addEventListener('change', (e) => {
updateFieldValue(field.key, e.target.value);
});
break;
case "daterange":
// Create a wrapper for two datetime inputs side by side
const rangeWrapper = document.createElement('div');
rangeWrapper.style.display = 'grid';
rangeWrapper.style.gridTemplateColumns = '1fr 1fr';
rangeWrapper.style.gap = '8px';
const startInput = document.createElement('input');
startInput.type = 'datetime-local';
startInput.value = field.value?.start || '';
startInput.readOnly = field.readonly;
startInput.placeholder = 'Von';
startInput.addEventListener('change', (e) => {
const newValue = { ...(field.value || {}), start: e.target.value };
updateFieldValue(field.key, newValue);
});
const endInput = document.createElement('input');
endInput.type = 'datetime-local';
endInput.value = field.value?.end || '';
endInput.readOnly = field.readonly;
endInput.placeholder = 'Bis';
endInput.addEventListener('change', (e) => {
const newValue = { ...(field.value || {}), end: e.target.value };
updateFieldValue(field.key, newValue);
});
rangeWrapper.appendChild(startInput);
rangeWrapper.appendChild(endInput);
container.appendChild(rangeWrapper);
return container;
case "select":
input = document.createElement('select');
input.disabled = field.readonly;
const emptyOption = document.createElement('option');
emptyOption.value = '';
input.appendChild(emptyOption);
(field.options || []).forEach(opt => {
const option = document.createElement('option');
option.value = opt;
// If this field uses constants, look up the display name
if (field.valueType === "constant" && field.constantKey && state.constants[field.constantKey]) {
const constantEntry = state.constants[field.constantKey].find(c => c.id === opt);
option.textContent = constantEntry ? constantEntry.displayName : opt;
} else {
option.textContent = opt;
}
if (opt === field.value) option.selected = true;
input.appendChild(option);
});
input.addEventListener('change', (e) => updateFieldValue(field.key, e.target.value));
break;
case "bool":
input = document.createElement('div');
input.className = 'toggle-switch' + (field.value ? ' active' : '');
if (!field.readonly) {
input.addEventListener('click', () => updateFieldValue(field.key, !field.value));
}
container.appendChild(input);
return container;
case "textarea":
input = document.createElement('textarea');
input.value = field.value || '';
input.readOnly = field.readonly;
input.rows = 3;
input.addEventListener('change', (e) => {
updateFieldValue(field.key, e.target.value);
});
break;
}
if (input) container.appendChild(input);
return container;
}
function createFieldRow(field, index) {
const row = document.createElement('div');
row.className = 'field-row';
// Add dependent class if field has visibleWhen dependency or parentField
if (field.visibleWhen || field.parentField) {
row.classList.add('dependent');
}
row.draggable = true;
row.addEventListener('dragstart', () => handleDragStart(index));
// Normal drop area (left 70%)
row.addEventListener('dragover', (e) => {
e.preventDefault();
const rect = row.getBoundingClientRect();
const mouseX = e.clientX - rect.left;
const isRightSide = mouseX > rect.width * 0.7;
if (isRightSide) {
handleDragOverNested(index, e);
} else {
handleDragOver(index);
}
});
row.addEventListener('drop', (e) => {
e.preventDefault();
const rect = row.getBoundingClientRect();
const mouseX = e.clientX - rect.left;
const isRightSide = mouseX > rect.width * 0.7;
handleDrop(index, isRightSide);
});
row.addEventListener('dragend', handleDragEnd);
// Drag Handle
const handle = document.createElement('div');
handle.className = 'drag-handle';
handle.textContent = '⋮⋮';
// Label
const label = document.createElement('div');
label.className = 'field-label' + (field.required ? ' required' : '');
const hierarchy = getFieldHierarchy(field.key);
if (hierarchy) {
const hierarchySpan = document.createElement('span');
hierarchySpan.className = 'hierarchy';
hierarchySpan.textContent = hierarchy;
label.appendChild(hierarchySpan);
}
const labelText = document.createTextNode(field.label);
label.appendChild(labelText);
if (!field.isSystem) {
const badge = document.createElement('span');
badge.className = 'custom-badge';
badge.textContent = 'CUSTOM';
label.appendChild(badge);
}
// Input Wrapper
const wrapper = document.createElement('div');
wrapper.className = 'field-input-wrapper';
wrapper.appendChild(createFieldInput(field));
// Clear Button
if (!field.readonly && !field.required && field.value) {
const clearBtn = document.createElement('button');
clearBtn.className = 'clear-btn';
clearBtn.textContent = '✕';
clearBtn.title = 'Leeren';
clearBtn.addEventListener('click', () => updateFieldValue(field.key, field.type === "bool" ? false : ""));
wrapper.appendChild(clearBtn);
}
// Delete Button (nur für Custom Fields)
if (!field.isSystem) {
const deleteBtn = document.createElement('button');
deleteBtn.className = 'clear-btn';
deleteBtn.textContent = '🗑';
deleteBtn.title = 'Feld löschen';
deleteBtn.addEventListener('click', () => deleteField(field.key));
wrapper.appendChild(deleteBtn);
}
row.appendChild(handle);
row.appendChild(label);
row.appendChild(wrapper);
return row;
}
function renderFields() {
const formBody = document.querySelector('.form-body');
if (!formBody) return;
formBody.innerHTML = '';
sortedFields().forEach((field, index) => {
if (field.visible) {
formBody.appendChild(createFieldRow(field, index));
}
});
}
function renderJSON() {
const jsonOutput = document.getElementById('json-output');
if (!jsonOutput) return;
if (showJSON()) {
jsonOutput.style.display = 'block';
jsonOutput.textContent = JSON.stringify(state, null, 2);
} else {
jsonOutput.style.display = 'none';
}
}
// Initial Render
const app = document.getElementById('app');
app.innerHTML = `
<div class="app-container">
<div class="form-card">
<div class="form-header">
<h1>${state.formTitle}</h1>
<div class="header-actions">
<button class="icon-btn" title="Hilfe">?</button>
<button class="icon-btn" title="Löschen">🗑</button>
<button class="icon-btn" title="Schließen">✕</button>
</div>
</div>
<div class="form-body"></div>
<div class="section-title">Benutzerdefinierte Felder hinzufügen</div>
<div class="add-field-section"></div>
<div class="form-footer">
<button class="btn btn-primary">✓ SPEICHERN</button>
</div>
</div>
<div class="json-panel">
<div class="json-header">
<span>Store JSON</span>
<button class="json-toggle-btn" id="toggleJsonBtn">Ausblenden</button>
</div>
<pre class="json-output" id="json-output"></pre>
</div>
</div>
`;
// Event Listeners
document.getElementById('toggleJsonBtn').addEventListener('click', () => {
setShowJSON(!showJSON());
const btn = document.getElementById('toggleJsonBtn');
const output = document.getElementById('json-output');
if (showJSON()) {
btn.textContent = 'Ausblenden';
output.style.display = 'block';
} else {
btn.textContent = 'Einblenden';
output.style.display = 'none';
}
});
// Render Validators
function renderValidators() {
const container = document.getElementById('validatorTags');
if (!container) return;
container.innerHTML = '';
VALIDATORS.forEach(validator => {
const tag = document.createElement('span');
tag.className = 'validator-tag';
tag.textContent = validator.label;
if (selectedValidators().includes(validator.id)) {
tag.classList.add('selected');
}
tag.addEventListener('click', () => {
const current = selectedValidators();
if (current.includes(validator.id)) {
setSelectedValidators(current.filter(v => v !== validator.id));
} else {
setSelectedValidators([...current, validator.id]);
}
renderValidators();
});
container.appendChild(tag);
});
}
// Render Enum Values with UUID and indentation
function renderEnumValues() {
const container = document.getElementById('enumValues');
if (!container) return;
container.innerHTML = '';
enumValues().forEach((enumVal, idx) => {
const row = document.createElement('div');
row.className = 'enum-value-row';
row.style.marginLeft = `${enumVal.indent * 20}px`;
// Indent controls
const indentControls = document.createElement('div');
indentControls.className = 'indent-controls';
const decreaseIndent = document.createElement('button');
decreaseIndent.className = 'indent-btn';
decreaseIndent.textContent = '←';
decreaseIndent.disabled = enumVal.indent === 0;
decreaseIndent.title = 'Einrückung verringern';
decreaseIndent.addEventListener('click', () => {
const vals = [...enumValues()];
vals[idx].indent = Math.max(0, vals[idx].indent - 1);
setEnumValues(vals);
renderEnumValues();
});
const increaseIndent = document.createElement('button');
increaseIndent.className = 'indent-btn';
increaseIndent.textContent = '→';
increaseIndent.disabled = enumVal.indent >= 3;
increaseIndent.title = 'Einrückung erhöhen';
increaseIndent.addEventListener('click', () => {
const vals = [...enumValues()];
vals[idx].indent = Math.min(3, vals[idx].indent + 1);
setEnumValues(vals);
renderEnumValues();
});
const indentLevel = document.createElement('div');
indentLevel.className = 'indent-indicator';
indentLevel.textContent = enumVal.indent;
indentControls.appendChild(decreaseIndent);
indentControls.appendChild(indentLevel);
indentControls.appendChild(increaseIndent);
// Key input
const keyInput = document.createElement('input');
keyInput.type = 'text';
keyInput.value = enumVal.id;
keyInput.placeholder = 'UUID/Key';
keyInput.addEventListener('input', (e) => {
const vals = [...enumValues()];
vals[idx].id = e.target.value;
setEnumValues(vals);
});
// Generate UUID button
const uuidBtn = document.createElement('button');
uuidBtn.className = 'small-btn';
uuidBtn.textContent = '🔑';
uuidBtn.title = 'UUID generieren';
uuidBtn.addEventListener('click', () => {
const vals = [...enumValues()];
vals[idx].id = generateUUID();
setEnumValues(vals);
renderEnumValues();
});
keyInput.style.display = 'flex';
keyInput.style.gap = '4px';
const keyWrapper = document.createElement('div');
keyWrapper.style.display = 'flex';
keyWrapper.style.gap = '4px';
keyWrapper.appendChild(keyInput);
keyWrapper.appendChild(uuidBtn);
// Display name input
const nameInput = document.createElement('input');
nameInput.type = 'text';
nameInput.value = enumVal.displayName;
nameInput.placeholder = 'Anzeigename';
nameInput.addEventListener('input', (e) => {
const vals = [...enumValues()];
vals[idx].displayName = e.target.value;
// Auto-generate key if empty
if (!vals[idx].id) {
vals[idx].id = generateKeyFromLabel(e.target.value);
}
setEnumValues(vals);
});
// Remove button
const removeBtn = document.createElement('button');
removeBtn.className = 'small-btn';
removeBtn.textContent = '✕';
removeBtn.title = 'Entfernen';
removeBtn.addEventListener('click', () => {
setEnumValues(enumValues().filter((_, i) => i !== idx));
renderEnumValues();
});
row.appendChild(indentControls);
row.appendChild(keyWrapper);
row.appendChild(nameInput);
if (enumValues().length > 1) {
row.appendChild(removeBtn);
} else {
row.appendChild(document.createElement('div')); // Spacer
}
container.appendChild(row);
});
// Add button
const addBtn = document.createElement('button');
addBtn.className = 'btn btn-secondary';
addBtn.style.marginTop = '8px';
addBtn.textContent = '+ Wert hinzufügen';
addBtn.addEventListener('click', () => {
setEnumValues([...enumValues(), { id: "", displayName: "", indent: 0 }]);
renderEnumValues();
});
container.appendChild(addBtn);
}
// Render Add Field Form
function renderAddFieldForm() {
const section = document.querySelector('.add-field-section');
if (!section) return;
section.innerHTML = `
<div class="add-field-form">
<div class="form-group">
<label>Feldname</label>
<input id="newFieldLabel" type="text" placeholder="z.B. Anfahrtszeit" />
</div>
<div class="form-group">
<label>Feldtyp</label>
<select id="newFieldType">
<option value="text">Text</option>
<option value="number">Zahl</option>
<option value="bool">Boolean</option>
<option value="select">Dropdown</option>
<option value="textarea">Textarea</option>
<option value="datetime-local">Datum/Zeit</option>
<option value="daterange">Datums-Bereich</option>
</select>
</div>
<div class="form-group" id="defaultValueGroup">
<label>Standardwert</label>
<input id="newFieldDefault" type="text" placeholder="Standard..." />
</div>
<div class="form-group" id="defaultBoolGroup" style="display: none;">
<label>Standardwert</label>
<div class="toggle-switch" id="newFieldBoolDefault"></div>
</div>
<button class="advanced-toggle" id="advancedToggle">
Erweiterte Optionen
</button>
<div class="advanced-config" id="advancedConfig">
<div class="form-group">
<label>Validatoren</label>
<div class="validator-tags" id="validatorTags"></div>
</div>
<div class="form-group" id="enumValuesGroup" style="display: none;">
<label>Dropdown-Werte (mit UUID & Einrückung)</label>
<div id="enumValues"></div>
</div>
</div>
<div class="form-actions">
<button class="btn btn-secondary" id="cancelFieldBtn">Abbrechen</button>
<button class="btn btn-primary" id="addFieldBtn">+ Feld hinzufügen</button>
</div>
</div>
`;
// Wire up event listeners
const labelInput = document.getElementById('newFieldLabel');
labelInput.value = newFieldLabel();
labelInput.addEventListener('input', (e) => setNewFieldLabel(e.target.value));
const typeSelect = document.getElementById('newFieldType');
typeSelect.value = newFieldType();
typeSelect.addEventListener('change', (e) => {
setNewFieldType(e.target.value);
updateDefaultValueVisibility();
renderAddFieldForm();
});
const defaultInput = document.getElementById('newFieldDefault');
if (defaultInput) {
defaultInput.value = newFieldDefault();
defaultInput.addEventListener('input', (e) => setNewFieldDefault(e.target.value));
}
// Boolean toggle
const boolToggle = document.getElementById('newFieldBoolDefault');
if (boolToggle) {
const currentBoolValue = newFieldDefault() === "true" || newFieldDefault() === true;
if (currentBoolValue) {
boolToggle.classList.add('active');
}
boolToggle.addEventListener('click', () => {
const newValue = !boolToggle.classList.contains('active');
setNewFieldDefault(newValue.toString());
boolToggle.classList.toggle('active');
});
}
// Advanced toggle
const advancedToggle = document.getElementById('advancedToggle');
const advancedConfig = document.getElementById('advancedConfig');
if (showAdvanced()) {
advancedConfig.classList.add('visible');
advancedToggle.classList.add('expanded');
}
advancedToggle.addEventListener('click', () => {
setShowAdvanced(!showAdvanced());
advancedConfig.classList.toggle('visible');
advancedToggle.classList.toggle('expanded');
});
// Buttons
document.getElementById('addFieldBtn').addEventListener('click', addCustomField);
document.getElementById('cancelFieldBtn').addEventListener('click', () => {
setNewFieldLabel("");
setNewFieldType("text");
setNewFieldDefault("");
setParentField("");
setSelectedValidators([]);
setEnumValues([{ id: "", displayName: "", indent: 0 }]);
setShowAdvanced(false);
renderAddFieldForm();
});
// Render sub-components
updateDefaultValueVisibility();
renderValidators();
// Show enum values if type is select
if (newFieldType() === 'select') {
document.getElementById('enumValuesGroup').style.display = 'flex';
renderEnumValues();
}
}
function updateDefaultValueVisibility() {
const type = newFieldType();
const defaultGroup = document.getElementById('defaultValueGroup');
const boolGroup = document.getElementById('defaultBoolGroup');
if (!defaultGroup || !boolGroup) return;
// Hide default value for datetime/daterange (defaults to "now")
if (type === 'datetime-local' || type === 'daterange') {
defaultGroup.style.display = 'none';
boolGroup.style.display = 'none';
} else if (type === 'select') {
defaultGroup.style.display = 'none'; // Handled by enum values
boolGroup.style.display = 'none';
} else if (type === 'bool') {
defaultGroup.style.display = 'none';
boolGroup.style.display = 'flex';
} else {
defaultGroup.style.display = 'flex';
boolGroup.style.display = 'none';
}
}
// Update Parent Field Selector
function updateParentFieldSelector() {
// No longer needed - hierarchy is done via drag & drop
}
// Event Listeners
document.getElementById('toggleJsonBtn').addEventListener('click', () => {
setShowJSON(!showJSON());
const btn = document.getElementById('toggleJsonBtn');
const output = document.getElementById('json-output');
if (showJSON()) {
btn.textContent = 'Ausblenden';
output.style.display = 'block';
} else {
btn.textContent = 'Einblenden';
output.style.display = 'none';
}
});
// Initial render
renderAddFieldForm();
// SolidJS Effects - Auto Re-render bei State-Änderungen
createEffect(() => {
renderFields();
});
createEffect(() => {
renderJSON();
});
// Initial Render
renderFields();
</script>
</body>
</html>
@fschutt
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Author

fschutt commented Nov 12, 2025 

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    padding: 20px;
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 20px;
}

.form-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.form-header {
    background: #3a3a3a;
    color: white;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-header h1 {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    font-size: 16px;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.form-body {
    padding: 16px;
}

.field-row {
    display: grid;
    grid-template-columns: 30px 1fr 2fr;
    gap: 8px;
    align-items: start;
    padding: 8px 4px;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.3s ease;
    position: relative;
}

.field-row:hover {
    background: #f9f9f9;
}

.field-row.dragging {
    opacity: 0.5;
    background: #e8f5e9;
}

.field-row.drag-over {
    margin-top: 40px;
    transition: margin-top 0.2s ease;
}

.field-row.drag-over::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 0;
    right: 0;
    height: 3px;
    background: #4caf50;
}

.field-row.drag-over-nested {
    margin-left: 50px;
    transition: margin-left 0.2s ease;
}

.field-row.drag-over-nested::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 0;
    right: 0;
    height: 3px;
    background: #FF9800;
}

.field-row.dependent {
    margin-left: 40px;
    background: #f8f8f8;
}

.field-row.dependent .drag-handle {
    color: #ccc;
}

.drag-handle {
    cursor: grab;
    color: #999;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    font-size: 14px;
}

.drag-handle:active {
    cursor: grabbing;
}

.field-label {
    color: #666;
    font-size: 13px;
    padding: 6px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.field-label.required::after {
    content: '*';
    color: #f44336;
}

.field-label .hierarchy {
    color: #999;
    font-size: 11px;
    margin-right: 4px;
}

.custom-badge {
    background: #FF9800;
    color: white;
    font-size: 9px;
    padding: 2px 5px;
    border-radius: 3px;
    margin-left: 4px;
    font-weight: 600;
}

.field-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
}

.field-input {
    flex: 1;
}

input[type="text"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #4caf50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

input.invalid,
select.invalid {
    border-color: #f44336;
}

input.invalid:focus,
select.invalid:focus {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
}

input[readonly],
input[disabled] {
    background: #f5f5f5;
    cursor: not-allowed;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 24px;
    background: #ccc;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.3s;
}

.toggle-switch.active {
    background: #4caf50;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-switch.active::after {
    transform: translateX(24px);
}

.clear-btn {
    background: none;
    border: none;
    color: #999;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 18px;
    line-height: 1;
}

.clear-btn:hover {
    color: #f44336;
}

.form-footer {
    padding: 12px 16px;
    background: #f9f9f9;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.btn-primary {
    background: #4caf50;
    color: white;
}

.btn-primary:hover {
    background: #45a049;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.btn-secondary {
    background: white;
    color: #666;
    border: 1px solid #ddd;
}

.btn-secondary:hover {
    background: #f5f5f5;
}

.section-title {
    background: #f5f5f5;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    color: #555;
    border-bottom: 1px solid #e0e0e0;
}

.add-field-section {
    padding: 16px;
    background: #fafafa;
}

.add-field-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: 12px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group select {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
}

.form-group .toggle-switch {
    align-self: flex-start;
}

.form-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 8px;
}

.advanced-toggle {
    background: none;
    border: none;
    color: #1976d2;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
    font-weight: 600;
}

.advanced-toggle::before {
    content: '▶';
    display: inline-block;
    transition: transform 0.2s;
    font-size: 10px;
}

.advanced-toggle.expanded::before {
    transform: rotate(90deg);
}

.advanced-config {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 12px;
    margin-top: 12px;
    display: none;
}

.advanced-config.visible {
    display: block;
}

.advanced-config-title {
    font-size: 12px;
    font-weight: 600;
    color: #666;
    margin-bottom: 8px;
    cursor: pointer;
    user-select: none;
}

.advanced-config-title::before {
    content: '▶ ';
    display: inline-block;
    transition: transform 0.2s;
}

.advanced-config.visible .advanced-config-title::before {
    transform: rotate(90deg);
}

.config-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 8px;
    margin-bottom: 8px;
    align-items: center;
    font-size: 12px;
}

.config-label {
    color: #666;
    font-weight: 500;
}

.parent-field-selector {
    font-size: 12px;
    padding: 4px 8px;
}

.validator-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.validator-tag {
    background: #e3f2fd;
    color: #1976d2;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 11px;
    cursor: pointer;
    border: 1px solid transparent;
}

.validator-tag.selected {
    background: #1976d2;
    color: white;
    border-color: #1565c0;
}

.enum-options {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.enum-option-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4px;
}

.enum-option-row input {
    padding: 4px 8px;
    font-size: 12px;
}

.enum-value-row {
    display: grid;
    grid-template-columns: auto 1fr 2fr auto;
    gap: 8px;
    margin-bottom: 6px;
    align-items: center;
}

.enum-value-row input {
    padding: 6px 10px;
    font-size: 12px;
    border: 1px solid #ddd;
    border-radius: 3px;
}

.indent-controls {
    display: flex;
    gap: 4px;
}

.indent-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    font-size: 14px;
    border: 1px solid #ddd;
    background: white;
    cursor: pointer;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.indent-btn:hover {
    background: #f5f5f5;
}

.indent-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.indent-indicator {
    width: 20px;
    text-align: center;
    color: #999;
    font-size: 11px;
    font-weight: 600;
}

.small-btn {
    padding: 4px 8px;
    font-size: 11px;
    border: 1px solid #ddd;
    background: white;
    cursor: pointer;
    border-radius: 3px;
}

.small-btn:hover {
    background: #f5f5f5;
}

.json-panel {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

.json-header {
    background: #2d2d2d;
    color: white;
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.json-toggle-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 4px 10px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 11px;
}

.json-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.json-output {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 16px;
    font-family: 'Courier New', monospace;
    font-size: 11px;
    overflow: auto;
    white-space: pre-wrap;
    flex: 1;
    margin: 0;
}
@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
    }

    .field-row {
        grid-template-columns: 30px 1fr;
        gap: 8px;
    }

    .field-label {
        grid-column: 2;
    }

    .field-input-wrapper {
        grid-column: 2;
    }

    .add-field-form {
        grid-template-columns: 1fr;
    }

    .json-panel {
        position: relative;
        max-height: 400px;
    }
}

@fschutt
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fschutt commented Nov 12, 2025

Extensible Form Engine Architecture

Overview

A declarative, computation-driven form engine that transforms JSON into a fully reactive UI using SolidJS. Based on the three-pillar architecture from planning/arch-2.md.

Three-Pillar Architecture

graph TB
    subgraph "Pillar 1: STATE"
        VALUES[values<br/>User Input]
        COMPUTED[computedValues<br/>Derived Data]
    end
    
    subgraph "Pillar 2: STRUCTURE"
        LAYOUT[layout<br/>LayoutNode Tree]
        REGISTRY[COMPONENT_REGISTRY<br/>String → Component]
    end
    
    subgraph "Pillar 3: BEHAVIOR"
        RULES[rules<br/>Rule Definitions]
        FUNCTIONS[FUNCTION_REGISTRY<br/>String → Function]
        ENGINE[Rule Engine<br/>Creates Reactive Graph]
    end
    
    VALUES --> ENGINE
    COMPUTED --> ENGINE
    RULES --> ENGINE
    FUNCTIONS --> ENGINE
    ENGINE --> COMPUTED
    LAYOUT --> REGISTRY
    REGISTRY --> UI[Rendered UI]
    VALUES --> UI
    COMPUTED --> UI
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Pillar 1: STATE (store.ts)

  • values: User-entered data (system.klient, system.beginn, etc.)
  • computedValues: Derived data (derived.stunden, derived.form_title, etc.)
  • SolidJS: createStore creates reactive proxy—reads track dependencies, writes trigger updates

Pillar 2: STRUCTURE (types.ts, registry.tsx)

  • layout: Tree of LayoutNode objects defining visual hierarchy
  • COMPONENT_REGISTRY: Maps component type strings to SolidJS components
  • SolidJS: <For> and <Show> primitives render tree recursively

Pillar 3: BEHAVIOR (types.ts, ruleEngine.ts, functionRegistry.ts)

  • rules: Array of declarative rules (COMPUTATION, VISIBILITY, VALIDATION)
  • FUNCTION_REGISTRY: Maps function name strings to implementations
  • Rule Engine: Transforms rules into SolidJS reactive primitives (memos/effects)

SolidJS Reactive Flow

Initialization Sequence

sequenceDiagram
    participant App
    participant Store
    participant RuleEngine
    participant Layout
    participant UI

    App->>Store: Load INITIAL_STATE
    App->>RuleEngine: initializeRuleEngine()
    RuleEngine->>Store: Read values & computedValues
    RuleEngine->>RuleEngine: Create reactive accessors
    loop For each rule
        RuleEngine->>RuleEngine: Create createMemo/createEffect
    end
    RuleEngine->>Store: Write initial computed values
    App->>Layout: Render layout tree
    Layout->>UI: Instantiate components
    UI->>Store: Read values (track dependencies)
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Field Update Flow

sequenceDiagram
    participant User
    participant Component as Field Component
    participant Store
    participant Memo as Rule Engine Memo
    participant Effect as Rule Engine Effect
    participant UI as Dependent UI

    User->>Component: Changes value
    Component->>Component: onUpdate(newValue)
    Component->>Store: updateValue(key, newValue)
    Store->>Store: setFormState("values", key, newValue)
    Store->>Memo: Triggers re-evaluation
    Note over Memo: Dependencies changed
    Memo->>Memo: Recompute output
    Memo->>Effect: New value available
    Effect->>Store: setComputedValue(outputKey, result)
    Store->>UI: Triggers re-render
    UI->>UI: Display updated value
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Concrete Example: Begin/End Time → Hours

The Setup

Rules:

[
  {
    "id": "rule_calc_duration_minutes",
    "type": "COMPUTATION",
    "inputs": ["system.beginn", "system.ende"],
    "outputs": ["derived.durationInMinutes"],
    "function": "calculateDifferenceInMinutes"
  },
  {
    "id": "rule_calc_hours",
    "type": "COMPUTATION",
    "inputs": ["derived.durationInMinutes"],
    "outputs": ["derived.stunden"],
    "function": "convertMinutesToHours"
  }
]

The Flow

graph LR
    A[User changes<br/>system.beginn] --> B[updateValue]
    B --> C[Store Update]
    C --> D[Memo 1 Recomputes]
    D --> E[calculateDifferenceInMinutes]
    E --> F[Effect 1 Writes]
    F --> G[derived.durationInMinutes<br/>updated]
    G --> H[Memo 2 Recomputes]
    H --> I[convertMinutesToHours]
    I --> J[Effect 2 Writes]
    J --> K[derived.stunden<br/>updated]
    K --> L[NumberField<br/>Re-renders]
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What the Rule Engine Creates

// For rule_calc_duration_minutes:
const memo1 = createMemo(() => {
  const beginn = formState.values["system.beginn"];
  const ende = formState.values["system.ende"];
  return calculateDifferenceInMinutes(beginn, ende);
});

createEffect(() => {
  setComputedValue("derived.durationInMinutes", memo1());
});

// For rule_calc_hours:
const memo2 = createMemo(() => {
  const minutes = formState.computedValues["derived.durationInMinutes"];
  return convertMinutesToHours(minutes);
});

createEffect(() => {
  setComputedValue("derived.stunden", memo2());
});

Dependency Graph (DAG)

The rules form a Directed Acyclic Graph:

graph TD
    BEGIN[system.beginn] -->|calculateDifferenceInMinutes| DURATION[derived.durationInMinutes]
    END[system.ende] -->|calculateDifferenceInMinutes| DURATION
    DURATION -->|convertMinutesToHours| HOURS[derived.stunden]
    HOURS -->|calculateSessionCount| SESSIONS[derived.anzahl_sitzungen]
    SESSIONLEN[system.sitzungslaenge] -->|calculateSessionCount| SESSIONS
    KLIENT[system.klient] -->|updateFormTitle| TITLE[derived.form_title]
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Rule Types

COMPUTATION

Calculates derived values from inputs.

What it creates:

  • createMemo: Computes the result
  • createEffect: Writes result to computedValues

Example:

// Rule
{
  type: "COMPUTATION",
  inputs: ["a", "b"],
  outputs: ["result"],
  function: "add"
}

// Generated Code
const memo = createMemo(() => add(formState.values.a, formState.values.b));
createEffect(() => setComputedValue("result", memo()));

VISIBILITY

Controls whether UI elements are shown.

What it creates:

  • createMemo: Returns boolean

Example:

// Rule
{
  type: "VISIBILITY",
  targetLayoutNodeId: "field_x",
  inputs: ["field_y"],
  function: "isEqualTo",
  params: { value: "show" }
}

// Generated Code
const visibilityMemo = createMemo(() => 
  isEqualTo(formState.values.field_y, { value: "show" })
);

// Used in component
<Show when={getNodeVisibilityAccessor("field_x")()}>
  <FieldComponent />
</Show>

VALIDATION

Validates field values (currently logs, future: validation state store).

What it creates:

  • createEffect: Runs validation function

Example:

// Rule
{
  type: "VALIDATION",
  targetFieldKey: "user.email",
  inputs: ["user.email"],
  function: "email"
}

// Generated Code
createEffect(() => {
  const isValid = email(formState.values["user.email"]);
  if (!isValid) console.warn("Invalid email");
});

Component Rendering

Layout Tree Rendering

graph TB
    FORM[ExtensibleDnDForm] --> RENDERER[LayoutNodeRenderer]
    RENDERER --> FOR["&lt;For each={layout}&gt;"]
    FOR --> SHOW1["&lt;Show when={isVisible()}&gt;"]
    SHOW1 --> CHECK{Is Section?}
    CHECK -->|Yes| SECTION[Render Section]
    CHECK -->|No| FIELD[SortableFieldRow]
    SECTION --> RECURSIVE[Recursive LayoutNodeRenderer]
    FIELD --> COMPONENT[Get component from registry]
    COMPONENT --> INSTANCE[Render field component]
    INSTANCE --> VALUE[Read value from store]
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Component Instantiation

// Layout node
{
  component: "TextField",
  fieldKey: "system.klient",
  label: "Klient"
}

// Rendered as
const FieldComponent = COMPONENT_REGISTRY["TextField"];
<FieldComponent 
  value={getValue("system.klient")}  // Reactive!
  onUpdate={(v) => updateValue("system.klient", v)}
/>

SolidJS Primitives Deep Dive

createStore

const [formState, setFormState] = createStore({ values: {...} });

// Read (tracks dependency)
const val = formState.values.klient;  // Component now depends on this

// Write (triggers updates)
setFormState("values", "klient", "New");  // All dependent components update

createMemo

// Only recomputes when dependencies change, result is cached
const hours = createMemo(() => {
  return formState.computedValues.durationInMinutes / 60;
});

hours();  // First call: computes
hours();  // Second call: returns cached value
// formState changes...
hours();  // Third call: recomputes

createEffect

// Runs immediately and whenever dependencies change
createEffect(() => {
  const val = formState.values.x;  // Tracks dependency
  console.log("x changed to:", val);  // Side effect
});

createRoot

// Creates owned reactive scope for cleanup
const dispose = createRoot((dispose) => {
  const memo = createMemo(...);
  createEffect(...);
  return dispose;
});

// Later: cleanup all reactive primitives
dispose();

File Responsibilities

File Purpose SolidJS Primitives
store.ts Central state createStore
types.ts Type definitions -
ruleEngine.ts Build reactive graph createMemo, createEffect, createRoot
functionRegistry.ts Function implementations -
registry.tsx Component mapping -
ExtensibleDnDForm.tsx Main UI, DnD, save/load <For>, <Show>, onMount
fields/*.tsx Field components Reactive props

Extending the System

Add a New Field Type

// 1. Create component (fields/ColorPicker.tsx)
export const ColorPickerField: Component<FieldInputProps> = (props) => (
  <input type="color" value={props.value} 
    onInput={(e) => props.onUpdate(e.target.value)} />
);

// 2. Register (registry.tsx)
export const COMPONENT_REGISTRY = {
  ...existing,
  ColorPicker: ColorPickerField,
};

// 3. Add type (types.ts)
export type ComponentType = "TextField" | ... | "ColorPicker";

// 4. Use in layout JSON
{ component: "ColorPicker", fieldKey: "brand.color", label: "Color" }

Add a New Function

// 1. Add to functionRegistry.ts
export const FUNCTION_REGISTRY = {
  ...existing,
  calculateDiscount: (price: number, percent: number) => price * (1 - percent/100),
};

// 2. Use in rules
{
  type: "COMPUTATION",
  inputs: ["cart.price", "user.discount"],
  outputs: ["cart.final_price"],
  function: "calculateDiscount"
}

Key Features

✅ Fully Declarative: Entire form is JSON (state, structure, behavior)
✅ Fine-Grained Reactivity: Only affected components update
✅ Computation Graph: Automatic dependency tracking and updates
✅ Extensible: Add fields/functions without touching core
✅ Serializable: Save/load entire form state
✅ Visualizable: Generate Mermaid dependency graphs
✅ Type-Safe: Full TypeScript support

Performance

  • Memoization: Computed values cached via createMemo
  • Granular Updates: Only components reading changed values re-render
  • Lazy Evaluation: <Show> components don't render when hidden
  • No Virtual DOM: SolidJS compiles to direct DOM updates
  • Memory Safe: createRoot ensures proper cleanup

Debugging

// View dependency graph
import { generateDependencyGraph } from './ruleEngine';
console.log(generateDependencyGraph());
// Paste into https://mermaid.live

// Trace dependencies
import { getFieldDependencies, getFieldDependents } from './ruleEngine';
console.log(getFieldDependencies('derived.stunden'));
// → ['derived.durationInMinutes']
console.log(getFieldDependents('system.beginn'));
// → ['derived.durationInMinutes']

Architecture Summary

graph TB
    subgraph "User Action"
        USER[User Input]
    end
    
    subgraph "State Layer"
        STORE[SolidJS Store<br/>values & computedValues]
    end
    
    subgraph "Behavior Layer"
        RULES[Rule Definitions]
        ENGINE[Rule Engine]
        MEMOS[createMemo]
        EFFECTS[createEffect]
    end
    
    subgraph "Structure Layer"
        LAYOUT[Layout Tree]
        REGISTRY[Component Registry]
        RENDERER[Recursive Renderer]
    end
    
    subgraph "Presentation"
        UI[UI Components]
    end
    
    USER --> UI
    UI --> STORE
    STORE --> MEMOS
    RULES --> ENGINE
    ENGINE --> MEMOS
    ENGINE --> EFFECTS
    MEMOS --> EFFECTS
    EFFECTS --> STORE
    STORE --> UI
    LAYOUT --> REGISTRY
    REGISTRY --> RENDERER
    RENDERER --> UI
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The form engine transforms declarative JSON into a reactive SolidJS application where:

  1. State lives in a reactive store
  2. Structure is a layout tree mapped to components
  3. Behavior is rules that create an automatic computation graph

When any value changes, SolidJS's fine-grained reactivity propagates updates through the graph, automatically recomputing derived values and updating only the affected UI components.

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