Created
December 27, 2010 09:30
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JQUERY PLUGIN: ‘AUTORESIZE’
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/* | |
* jQuery autoResize (textarea auto-resizer) | |
* @copyright James Padolsey http://james.padolsey.com | |
* @version 1.04 | |
*/ | |
(function($){ | |
$.fn.autoResize = function(options) { | |
// Just some abstracted details, | |
// to make plugin users happy: | |
var settings = $.extend({ | |
// limit textaream length | |
onResizeBefore: function(){}, | |
onResize : function(){}, | |
animate : true, | |
animateDuration : 150, | |
animateCallback : function(){}, | |
extraSpace : 20, | |
limit: 1000 | |
}, options); | |
// Only textarea's auto-resize: | |
this.filter('textarea').each(function(){ | |
// Get rid of scrollbars and disable WebKit resizing: | |
var textarea = $(this).css({resize:'none','overflow-y':'hidden'}), | |
// Cache original height, for use later: | |
origHeight = textarea.height(), | |
// Need clone of textarea, hidden off screen: | |
clone = (function(){ | |
// Properties which may effect space taken up by chracters: | |
var props = ['height','width','lineHeight','textDecoration','letterSpacing'], | |
propOb = {}; | |
// Create object of styles to apply: | |
$.each(props, function(i, prop){ | |
propOb[prop] = textarea.css(prop); | |
}); | |
// Clone the actual textarea removing unique properties | |
// and insert before original textarea: | |
return textarea.clone().removeAttr('id').removeAttr('name').css({ | |
position: 'absolute', | |
top: 0, | |
left: -9999 | |
}).css(propOb).attr('tabIndex','-1').insertBefore(textarea); | |
})(), | |
lastScrollTop = null, | |
updateSize = function(event) { | |
// if onResizeBefore return true, the updateSize function return; | |
var returnCallback = settings.onResizeBefore.call(this, event); | |
if(!!returnCallback) return; | |
// Prepare the clone: | |
clone.height(0).val($(this).val()).scrollTop(10000); | |
//console.log($(this).css('font-size')) | |
// Find the height of text: | |
var scrollTop = Math.max(clone.scrollTop(), origHeight) + settings.extraSpace, | |
toChange = $(this).add(clone); | |
// Don't do anything if scrollTip hasen't changed: | |
if (lastScrollTop === scrollTop) { return; } | |
lastScrollTop = scrollTop; | |
// Check for limit: | |
if ( scrollTop >= settings.limit ) { | |
$(this).css('overflow-y',''); | |
return; | |
} | |
// Fire off callback: | |
settings.onResize.call(this, event); | |
// Either animate or directly apply height: | |
settings.animate && textarea.css('display') === 'block' ? | |
toChange.stop().animate({height:scrollTop}, settings.animateDuration, settings.animateCallback) | |
: toChange.height(scrollTop); | |
}; | |
// Bind namespaced handlers to appropriate events: | |
textarea | |
.unbind('.dynSiz') | |
.bind('keyup.dynSiz', updateSize) | |
.bind('keydown.dynSiz', updateSize) | |
.bind('change.dynSiz', updateSize); | |
}); | |
// Chain: | |
return this; | |
}; | |
})(jQuery); | |
// Example: | |
$(function(){ | |
$('#ta').autoResize({animate: true,extraSpace:20, onResizeBefore: function(event){ | |
var str = $.trim($(this).val()); | |
if(str.length > 140) return true; | |
}}); | |
}); |
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