/*!
* Clamp.js 0.5.1
*
* Copyright 2011-2013, Joseph Schmitt http://joe.sh
* Released under the WTFPL license
* http://sam.zoy.org/wtfpl/
*/
(function(){
/**
* Clamps a text node.
* @param {HTMLElement} element. Element containing the text node to clamp.
* @param {Object} options. Options to pass to the clamper.
*/
function clamp(element, options) {
options = options || {};
var self = this,
win = window,
opt = {
clamp: options.clamp || 2,
useNativeClamp: typeof(options.useNativeClamp) != 'undefined' ? options.useNativeClamp : true,
splitOnChars: options.splitOnChars || ['.', '-', 'â', 'â', ' '], //Split on sentences (periods), hypens, en-dashes, em-dashes, and words (spaces).
animate: options.animate || false,
truncationChar: options.truncationChar || 'â¦',
truncationHTML: options.truncationHTML
},
sty = element.style,
originalText = element.innerHTML,
supportsNativeClamp = typeof(element.style.webkitLineClamp) != 'undefined',
clampValue = opt.clamp,
isCSSValue = clampValue.indexOf && (clampValue.indexOf('px') > -1 || clampValue.indexOf('em') > -1),
truncationHTMLContainer;
if (opt.truncationHTML) {
truncationHTMLContainer = document.createElement('span');
truncationHTMLContainer.innerHTML = opt.truncationHTML;
}
// UTILITY FUNCTIONS __________________________________________________________
/**
* Return the current style for an element.
* @param {HTMLElement} elem The element to compute.
* @param {string} prop The style property.
* @returns {number}
*/
function computeStyle(elem, prop) {
if (!win.getComputedStyle) {
win.getComputedStyle = function(el, pseudo) {
this.el = el;
this.getPropertyValue = function(prop) {
var re = /(\-([a-z]){1})/g;
if (prop == 'float') prop = 'styleFloat';
if (re.test(prop)) {
prop = prop.replace(re, function () {
return arguments[2].toUpperCase();
});
}
return el.currentStyle && el.currentStyle[prop] ? el.currentStyle[prop] : null;
}
return this;
}
}
return win.getComputedStyle(elem, null).getPropertyValue(prop);
}
/**
* Returns the maximum number of lines of text that should be rendered based
* on the current height of the element and the line-height of the text.
*/
function getMaxLines(height) {
var availHeight = height || element.clientHeight,
lineHeight = getLineHeight(element);
return Math.max(Math.floor(availHeight/lineHeight), 0);
}
/**
* Returns the maximum height a given element should have based on the line-
* height of the text and the given clamp value.
*/
function getMaxHeight(clmp) {
var lineHeight = getLineHeight(element);
return lineHeight * clmp;
}
/**
* Returns the line-height of an element as an integer.
*/
function getLineHeight(elem) {
var lh = computeStyle(elem, 'line-height');
if (lh == 'normal') {
// Normal line heights vary from browser to browser. The spec recommends
// a value between 1.0 and 1.2 of the font size. Using 1.1 to split the diff.
lh = parseInt(computeStyle(elem, 'font-size')) * 1.2;
}
return parseInt(lh);
}
// MEAT AND POTATOES (MMMM, POTATOES...) ______________________________________
var splitOnChars = opt.splitOnChars.slice(0),
splitChar = splitOnChars[0],
chunks,
lastChunk;
/**
* Gets an element's last child. That may be another node or a node's contents.
*/
function getLastChild(elem) {
//Current element has children, need to go deeper and get last child as a text node
if (elem.lastChild.children && elem.lastChild.children.length > 0) {
return getLastChild(Array.prototype.slice.call(elem.children).pop());
}
//This is the absolute last child, a text node, but something's wrong with it. Remove it and keep trying
else if (!elem.lastChild || !elem.lastChild.nodeValue || elem.lastChild.nodeValue == '' || elem.lastChild.nodeValue == opt.truncationChar) {
elem.lastChild.parentNode.removeChild(elem.lastChild);
return getLastChild(element);
}
//This is the last child we want, return it
else {
return elem.lastChild;
}
}
/**
* Removes one character at a time from the text until its width or
* height is beneath the passed-in max param.
*/
function truncate(target, maxHeight) {
if (!maxHeight) {return;}
/**
* Resets global variables.
*/
function reset() {
splitOnChars = opt.splitOnChars.slice(0);
splitChar = splitOnChars[0];
chunks = null;
lastChunk = null;
}
var nodeValue = target.nodeValue.replace(opt.truncationChar, '');
//Grab the next chunks
if (!chunks) {
//If there are more characters to try, grab the next one
if (splitOnChars.length > 0) {
splitChar = splitOnChars.shift();
}
//No characters to chunk by. Go character-by-character
else {
splitChar = '';
}
chunks = nodeValue.split(splitChar);
}
//If there are chunks left to remove, remove the last one and see if
// the nodeValue fits.
if (chunks.length > 1) {
// console.log('chunks', chunks);
lastChunk = chunks.pop();
// console.log('lastChunk', lastChunk);
applyEllipsis(target, chunks.join(splitChar));
}
//No more chunks can be removed using this character
else {
chunks = null;
}
//Insert the custom HTML before the truncation character
if (truncationHTMLContainer) {
target.nodeValue = target.nodeValue.replace(opt.truncationChar, '');
element.innerHTML = target.nodeValue + ' ' + truncationHTMLContainer.innerHTML + opt.truncationChar;
}
//Search produced valid chunks
if (chunks) {
//It fits
if (element.clientHeight <= maxHeight) {
//There's still more characters to try splitting on, not quite done yet
if (splitOnChars.length >= 0 && splitChar != '') {
applyEllipsis(target, chunks.join(splitChar) + splitChar + lastChunk);
chunks = null;
}
//Finished!
else {
return element.innerHTML;
}
}
}
//No valid chunks produced
else {
//No valid chunks even when splitting by letter, time to move
//on to the next node
if (splitChar == '') {
applyEllipsis(target, '');
target = getLastChild(element);
reset();
}
}
//If you get here it means still too big, let's keep truncating
if (opt.animate) {
setTimeout(function() {
truncate(target, maxHeight);
}, opt.animate === true ? 10 : opt.animate);
}
else {
return truncate(target, maxHeight);
}
}
function applyEllipsis(elem, str) {
elem.nodeValue = str + opt.truncationChar;
}
// CONSTRUCTOR ________________________________________________________________
if (clampValue == 'auto') {
clampValue = getMaxLines();
}
else if (isCSSValue) {
clampValue = getMaxLines(parseInt(clampValue));
}
var clampedText;
if (supportsNativeClamp && opt.useNativeClamp) {
sty.overflow = 'hidden';
sty.textOverflow = 'ellipsis';
sty.webkitBoxOrient = 'vertical';
sty.display = '-webkit-box';
sty.webkitLineClamp = clampValue;
if (isCSSValue) {
sty.height = opt.clamp + 'px';
}
}
else {
var height = getMaxHeight(clampValue);
if (height <= element.clientHeight) {
clampedText = truncate(getLastChild(element), height);
}
}
return {
'original': originalText,
'clamped': clampedText
}
}
window.$clamp = clamp;
})();
var module = document.querySelector(".box p");
var _text = $(".box p").text();
$(".box p").scroll(function(e) {
if($(this).scrollTop() === 0)
$clamp(module, {clamp: 3});
else
$clamp(module, {clamp: 9999999});
});
$clamp(module, {clamp: 3});
body {
align-items: center;
background:
radial-gradient(
farthest-side at bottom left,
rgba(255, 0, 255, 0.5),
#246756
),
radial-gradient(
farthest-corner at bottom right,
rgba(255, 50, 50, 0.5),
#246756 400px
);
display: flex;
height: 100vh;
justify-content: center;
line-height: 1.5;
}
.box {
background-color: #fff;
box-shadow: 2px 2px 10px #246756;
padding: 2em;
width: 200px;
}
.box p {
overflow: scroll !important;
max-height: 100px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="box">
<p>Hey, don't cut me off like that. I want to speak my mind and don't appreciate being put into a box. More text coming here and here and here and here and here.</p>
</div>
