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August 8, 2014 05:55
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jQuery autoResize (textarea auto-resizer)
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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({ | |
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: | |
$.each(props, function(i, prop){ | |
propOb[prop] = textarea.css(prop); | |
}); | |
// Clone the actual textarea removing unique properties | |
// and insert before original textarea: | |
return textarea.clone().removeAttr('id').removeAttr('name').css({ | |
position: 'absolute', | |
top: 0, | |
left: -9999 | |
}).css(propOb).attr('tabIndex','-1').insertBefore(textarea); | |
})(), | |
lastScrollTop = null, | |
updateSize = function() { | |
// Prepare the clone: | |
clone.height(0).val($(this).val()).scrollTop(10000); | |
// 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); | |
// 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); |
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/* | |
* jQuery autoResize (textarea auto-resizer) | |
* @copyright James Padolsey http://james.padolsey.com | |
* @version 1.04 | |
*/ | |
(function(a){a.fn.autoResize=function(j){var b=a.extend({onResize:function(){},animate:true,animateDuration:150,animateCallback:function(){},extraSpace:20,limit:1000},j);this.filter('textarea').each(function(){var c=a(this).css({resize:'none','overflow-y':'hidden'}),k=c.height(),f=(function(){var l=['height','width','lineHeight','textDecoration','letterSpacing'],h={};a.each(l,function(d,e){h[e]=c.css(e)});return c.clone().removeAttr('id').removeAttr('name').css({position:'absolute',top:0,left:-9999}).css(h).attr('tabIndex','-1').insertBefore(c)})(),i=null,g=function(){f.height(0).val(a(this).val()).scrollTop(10000);var d=Math.max(f.scrollTop(),k)+b.extraSpace,e=a(this).add(f);if(i===d){return}i=d;if(d>=b.limit){a(this).css('overflow-y','');return}b.onResize.call(this);b.animate&&c.css('display')==='block'?e.stop().animate({height:d},b.animateDuration,b.animateCallback):e.height(d)};c.unbind('.dynSiz').bind('keyup.dynSiz',g).bind('keydown.dynSiz',g).bind('change.dynSiz',g)});return this}})(jQuery); |
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