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96 lines
3.5 KiB
JavaScript
96 lines
3.5 KiB
JavaScript
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/*
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* jQuery autoResize (textarea auto-resizer)
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* @copyright James Padolsey http://james.padolsey.com
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* @version 1.04
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*/
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(function($){
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$.fn.autoResize = function(options) {
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// Just some abstracted details,
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// to make plugin users happy:
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var settings = $.extend({
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onResize : function(){},
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animate : true,
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animateDuration : 150,
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animateCallback : function(){},
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extraSpace : 20,
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limit: 1000
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}, options);
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// Only textarea's auto-resize:
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this.filter('textarea').each(function(){
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// Get rid of scrollbars and disable WebKit resizing:
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var textarea = $(this).css({resize:'none','overflow-y':'hidden'}),
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// Cache original height, for use later:
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origHeight = textarea.height(),
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// Need clone of textarea, hidden off screen:
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clone = (function(){
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// Properties which may effect space taken up by chracters:
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var props = ['height','width','lineHeight','textDecoration','letterSpacing'],
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propOb = {};
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// Create object of styles to apply:
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$.each(props, function(i, prop){
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propOb[prop] = textarea.css(prop);
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});
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// Clone the actual textarea removing unique properties
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// and insert before original textarea:
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return textarea.clone().removeAttr('id').removeAttr('name').css({
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position: 'absolute',
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top: 0,
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left: -9999
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}).css(propOb).attr('tabIndex','-1').insertBefore(textarea);
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})(),
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lastScrollTop = null,
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updateSize = function() {
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// Prepare the clone:
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clone.height(0).val($(this).val()).scrollTop(10000);
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// Find the height of text:
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var scrollTop = Math.max(clone.scrollTop(), origHeight) + settings.extraSpace,
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toChange = $(this).add(clone);
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// Don't do anything if scrollTip hasen't changed:
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if (lastScrollTop === scrollTop) { return; }
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lastScrollTop = scrollTop;
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// Check for limit:
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if ( scrollTop >= settings.limit ) {
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$(this).css('overflow-y','');
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return;
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}
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// Fire off callback:
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settings.onResize.call(this);
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// Either animate or directly apply height:
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settings.animate && textarea.css('display') === 'block' ?
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toChange.stop().animate({height:scrollTop}, settings.animateDuration, settings.animateCallback)
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: toChange.height(scrollTop);
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};
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// Bind namespaced handlers to appropriate events:
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textarea
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.unbind('.dynSiz')
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.bind('keyup.dynSiz', updateSize)
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.bind('keydown.dynSiz', updateSize)
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.bind('change.dynSiz', updateSize);
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});
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// Chain:
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return this;
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};
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})(jQuery);
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