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SYWEB-12: You'll be needing this.
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Kegan Dougal
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216
webclient/js/elastic.js
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216
webclient/js/elastic.js
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/*
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* angular-elastic v2.4.0
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* (c) 2014 Monospaced http://monospaced.com
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* License: MIT
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*/
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angular.module('monospaced.elastic', [])
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.constant('msdElasticConfig', {
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append: ''
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})
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.directive('msdElastic', [
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'$timeout', '$window', 'msdElasticConfig',
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function($timeout, $window, config) {
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'use strict';
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return {
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require: 'ngModel',
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restrict: 'A, C',
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link: function(scope, element, attrs, ngModel) {
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// cache a reference to the DOM element
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var ta = element[0],
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$ta = element;
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// ensure the element is a textarea, and browser is capable
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if (ta.nodeName !== 'TEXTAREA' || !$window.getComputedStyle) {
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return;
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}
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// set these properties before measuring dimensions
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$ta.css({
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'overflow': 'hidden',
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'overflow-y': 'hidden',
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'word-wrap': 'break-word'
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});
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// force text reflow
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var text = ta.value;
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ta.value = '';
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ta.value = text;
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var append = attrs.msdElastic ? attrs.msdElastic.replace(/\\n/g, '\n') : config.append,
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$win = angular.element($window),
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mirrorInitStyle = 'position: absolute; top: -999px; right: auto; bottom: auto;' +
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'left: 0; overflow: hidden; -webkit-box-sizing: content-box;' +
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'-moz-box-sizing: content-box; box-sizing: content-box;' +
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'min-height: 0 !important; height: 0 !important; padding: 0;' +
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'word-wrap: break-word; border: 0;',
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$mirror = angular.element('<textarea tabindex="-1" ' +
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'style="' + mirrorInitStyle + '"/>').data('elastic', true),
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mirror = $mirror[0],
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taStyle = getComputedStyle(ta),
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resize = taStyle.getPropertyValue('resize'),
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borderBox = taStyle.getPropertyValue('box-sizing') === 'border-box' ||
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taStyle.getPropertyValue('-moz-box-sizing') === 'border-box' ||
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taStyle.getPropertyValue('-webkit-box-sizing') === 'border-box',
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boxOuter = !borderBox ? {width: 0, height: 0} : {
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width: parseInt(taStyle.getPropertyValue('border-right-width'), 10) +
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parseInt(taStyle.getPropertyValue('padding-right'), 10) +
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parseInt(taStyle.getPropertyValue('padding-left'), 10) +
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parseInt(taStyle.getPropertyValue('border-left-width'), 10),
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height: parseInt(taStyle.getPropertyValue('border-top-width'), 10) +
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parseInt(taStyle.getPropertyValue('padding-top'), 10) +
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parseInt(taStyle.getPropertyValue('padding-bottom'), 10) +
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parseInt(taStyle.getPropertyValue('border-bottom-width'), 10)
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},
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minHeightValue = parseInt(taStyle.getPropertyValue('min-height'), 10),
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heightValue = parseInt(taStyle.getPropertyValue('height'), 10),
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minHeight = Math.max(minHeightValue, heightValue) - boxOuter.height,
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maxHeight = parseInt(taStyle.getPropertyValue('max-height'), 10),
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mirrored,
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active,
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copyStyle = ['font-family',
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'font-size',
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'font-weight',
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'font-style',
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'letter-spacing',
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'line-height',
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'text-transform',
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'word-spacing',
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'text-indent'];
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// exit if elastic already applied (or is the mirror element)
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if ($ta.data('elastic')) {
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return;
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}
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// Opera returns max-height of -1 if not set
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maxHeight = maxHeight && maxHeight > 0 ? maxHeight : 9e4;
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// append mirror to the DOM
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if (mirror.parentNode !== document.body) {
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angular.element(document.body).append(mirror);
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}
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// set resize and apply elastic
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$ta.css({
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'resize': (resize === 'none' || resize === 'vertical') ? 'none' : 'horizontal'
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}).data('elastic', true);
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/*
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* methods
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*/
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function initMirror() {
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var mirrorStyle = mirrorInitStyle;
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mirrored = ta;
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// copy the essential styles from the textarea to the mirror
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taStyle = getComputedStyle(ta);
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angular.forEach(copyStyle, function(val) {
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mirrorStyle += val + ':' + taStyle.getPropertyValue(val) + ';';
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});
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mirror.setAttribute('style', mirrorStyle);
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}
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function adjust() {
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var taHeight,
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taComputedStyleWidth,
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mirrorHeight,
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width,
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overflow;
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if (mirrored !== ta) {
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initMirror();
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}
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// active flag prevents actions in function from calling adjust again
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if (!active) {
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active = true;
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mirror.value = ta.value + append; // optional whitespace to improve animation
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mirror.style.overflowY = ta.style.overflowY;
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taHeight = ta.style.height === '' ? 'auto' : parseInt(ta.style.height, 10);
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taComputedStyleWidth = getComputedStyle(ta).getPropertyValue('width');
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// ensure getComputedStyle has returned a readable 'used value' pixel width
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if (taComputedStyleWidth.substr(taComputedStyleWidth.length - 2, 2) === 'px') {
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// update mirror width in case the textarea width has changed
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width = parseInt(taComputedStyleWidth, 10) - boxOuter.width;
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mirror.style.width = width + 'px';
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}
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mirrorHeight = mirror.scrollHeight;
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if (mirrorHeight > maxHeight) {
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mirrorHeight = maxHeight;
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overflow = 'scroll';
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} else if (mirrorHeight < minHeight) {
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mirrorHeight = minHeight;
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}
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mirrorHeight += boxOuter.height;
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ta.style.overflowY = overflow || 'hidden';
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if (taHeight !== mirrorHeight) {
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ta.style.height = mirrorHeight + 'px';
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scope.$emit('elastic:resize', $ta);
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}
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// small delay to prevent an infinite loop
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$timeout(function() {
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active = false;
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}, 1);
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}
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}
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function forceAdjust() {
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active = false;
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adjust();
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}
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/*
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* initialise
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*/
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// listen
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if ('onpropertychange' in ta && 'oninput' in ta) {
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// IE9
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ta['oninput'] = ta.onkeyup = adjust;
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} else {
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ta['oninput'] = adjust;
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}
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$win.bind('resize', forceAdjust);
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scope.$watch(function() {
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return ngModel.$modelValue;
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}, function(newValue) {
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forceAdjust();
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});
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scope.$on('elastic:adjust', function() {
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initMirror();
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forceAdjust();
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});
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$timeout(adjust);
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/*
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* destroy
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*/
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scope.$on('$destroy', function() {
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$mirror.remove();
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$win.unbind('resize', forceAdjust);
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});
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}
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};
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}
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]);
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