diff options
Diffstat (limited to 'app/assets/javascripts/vendor/autoresize.jquery.js')
-rw-r--r-- | app/assets/javascripts/vendor/autoresize.jquery.js | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/app/assets/javascripts/vendor/autoresize.jquery.js b/app/assets/javascripts/vendor/autoresize.jquery.js new file mode 100644 index 0000000..28cec5d --- /dev/null +++ b/app/assets/javascripts/vendor/autoresize.jquery.js @@ -0,0 +1,94 @@ +/* + * 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); |