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