通过 YUI 处理事件的问题
当用户单击“搜索”输入元素时,输入中的搜索文本将消失,并且由于我有几个类似的控件,我认为我可以使代码可重用。这是我以前完成并使用 jQuery 的代码,但现在在 YUI 中我无法使其工作。
var subscriptionBoxTarget = "div.main div.main-content div.side-right div.subscription-box input";
var ssbNode = YAHOO.util.Selector.query(subscriptionBoxTarget);
var ssbValue = YAHOO.util.DOM.getAttribute(ssbNode,"value");
var subscriptionBox = new RemovableText(ssbNode,ssbValue,null);
subscriptionBox.bind();
////////////////////////////////
//target : the target of the element which dispatches the event
// defaultText : the default for input[type=text] elements
// callBack : is a function which is run after everthing is completed
function RemovableText(target,defaultText,callBack)
{
var target = target; //private members
var defaultText = defaultText;
var callBack = callBack;
//instance method
this.bind = function()
{
mouseClick(target,defaultText);
mouseOff(target,defaultText);
if(callBack != null)
callBack();
}
//private methods
var mouseClick = function(eventTarget,defaultValue)
{
var _eventTarget = eventTarget;
var _defaultValue = defaultValue;
/*$(eventTarget).bind("click",function(){
var currentValue = $(this).val();
if(currentValue == defaultValue)
$(this).val("");
});*/
YAHOO.util.Event.addListener(_eventTarget,"click",function(e){
alert(e);
});
}
var mouseOff = function(eventTarget,defaultValue)
{
var _eventTarget = eventTarget;
var _defaultValue = defaultValue;
/*$(eventTarget).bind("blur",function(){
var currentValue = $(this).val();
if(currentValue == "")
$(this).val(_defaultValue);
});*/
YAHOO.util.Event.addListener(_eventTarget,"blur",function(e){
alert(e);
});
}
}
When users click "search" input element, the search text inside the input will disappear and since I have several controls like that, I thought I could make the code reusable. Here is my code formerly done and working with jQuery but now in YUI I cannot make it work.
var subscriptionBoxTarget = "div.main div.main-content div.side-right div.subscription-box input";
var ssbNode = YAHOO.util.Selector.query(subscriptionBoxTarget);
var ssbValue = YAHOO.util.DOM.getAttribute(ssbNode,"value");
var subscriptionBox = new RemovableText(ssbNode,ssbValue,null);
subscriptionBox.bind();
////////////////////////////////
//target : the target of the element which dispatches the event
// defaultText : the default for input[type=text] elements
// callBack : is a function which is run after everthing is completed
function RemovableText(target,defaultText,callBack)
{
var target = target; //private members
var defaultText = defaultText;
var callBack = callBack;
//instance method
this.bind = function()
{
mouseClick(target,defaultText);
mouseOff(target,defaultText);
if(callBack != null)
callBack();
}
//private methods
var mouseClick = function(eventTarget,defaultValue)
{
var _eventTarget = eventTarget;
var _defaultValue = defaultValue;
/*$(eventTarget).bind("click",function(){
var currentValue = $(this).val();
if(currentValue == defaultValue)
$(this).val("");
});*/
YAHOO.util.Event.addListener(_eventTarget,"click",function(e){
alert(e);
});
}
var mouseOff = function(eventTarget,defaultValue)
{
var _eventTarget = eventTarget;
var _defaultValue = defaultValue;
/*$(eventTarget).bind("blur",function(){
var currentValue = $(this).val();
if(currentValue == "")
$(this).val(_defaultValue);
});*/
YAHOO.util.Event.addListener(_eventTarget,"blur",function(e){
alert(e);
});
}
}
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论
评论(1)
这里有很多不必要的代码。
传递给 RemovableText 构造函数的输入参数可通过内部定义的所有方法的闭包获得。您不需要也不应该将命名参数重新定义为变量。
构造函数中实例方法的定义似乎很可疑,因为传递给构造函数的值必须保持私有的要求。只需将它们分配给实例属性(this._target = target; 等)并将实例方法添加到原型即可。如果您想要的功能就是这么简单,那么为什么还要费心使用方法呢?
使用点击事件不支持键盘导航。您应该使用焦点事件。
我不确定为什么您会在构造时传递一个回调,该回调在附加事件订阅者后立即触发。
You have a lot of unnecessary code here.
The input parameters passed to the RemovableText constructor are available by closure to all the methods defined inside. You don't need to, and shouldn't redefine named params as vars.
The definition of an instance method from within the constructor seems dubious, as is the requirement that the values passed to the constructor must be kept private. Just assign them to instance properties (this._target = target; etc) and add instance methods to the prototype. If the functionality you're after is just this simple, then why bother with methods at all?
Using the click event does not support keyboard navigation. You should use the focus event.
I'm not sure why you would have a callback passed at construction that fires immediately after attaching the event subscribers.