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bacanu/truncate.js

Created January 16, 2019 11:02
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Truncate to n number of lines
Raw
truncate.js
'use strict';
var linesElement = 3; //it will truncate at 3 lines.
var truncateElement = document.getElementById('truncateme');
var truncateText = truncateElement.textContent;
var getLineHeight = function getLineHeight(element) {
var lineHeight = window.getComputedStyle(truncateElement)['line-height'];
if (lineHeight === 'normal') {
// sucky chrome
return 1.16 * parseFloat(window.getComputedStyle(truncateElement)['font-size']);
} else {
return parseFloat(lineHeight);
}
};
linesElement.addEventListener('change', function () {
truncateElement.innerHTML = truncateText;
var truncateTextParts = truncateText.split(' ');
var lineHeight = getLineHeight(truncateElement);
var lines = parseInt(linesElement.value);
while (lines * lineHeight < truncateElement.clientHeight) {
console.log(truncateTextParts.length, lines * lineHeight, truncateElement.clientHeight);
truncateTextParts.pop();
truncateElement.innerHTML = truncateTextParts.join(' ') + '...';
}
});
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