knockoutjs readonly 绑定扩充

使用例子 <input type="text" data-bind="readonly:aaValue()==2"  />

扩展代码

ko.bindingHandlers.readonly = {
			init: function(element, valueAccessor) {
				if(element.tagName == "INPUT" && $(element).attr("type") == "text")
				{
					if(valueAccessor())
					{
						element.readOnly = true;
					}else{
						element.readOnly = false;
					}
				}       
		    },
		    update: function(element, valueAccessor) {
		    	if(element.tagName == "INPUT" && $(element).attr("type") == "text")
				{
					if(valueAccessor())
					{
						element.readOnly = true;
					}else{
						element.readOnly = false;
					}
				}
		    }
	};

?

?