什么时候调用YUI destroy?
什么时候应该调用 destroy ? YUI 生命周期是否会自动调用它?页面卸载是否会导致 YUI 生命周期对页面处理期间创建的所有对象调用 destroy ?我一直在假设我需要自己进行所有调用来销毁,但是当 ajax 调用替换我逐渐增强的代码部分时,这就变得很麻烦。例如:
<div id="replaceMe">
<table>
<tr>
<td>1</td>
</tr>
<tr>
<td>2</td>
</tr>
</table>
<script>
YUI().use('my-lib', function(Y) {
Y.mypackage.enhanceTable("replaceMe");
});
<script>
</div>
my-lib 模块基本上为每一行添加一个单击处理程序和鼠标悬停:
YUI.add('my-lib', function(Y) {
function EnhancedTable(config) {
EnhancedTable.superclass.constructor.apply(this, arguments);
}
EnhancedTable.NAME = "enhanced-table";
EnhancedTable.ATTRS = {
containerId : {},
onClickHandler : {},
onMouseoverHandler : {},
onMouseoutHandler : {}
};
Y.extend(EnhancedTable, Y.Base, {
_click : function(e) {
//... submit action
},
destructor : function() {
var onClickHandler = this.get("onClickHandler"),
onMouseoverHandler = this.get("onMouseoverHandler"),
onMouseoutHandler = this.get("onMouseoutHandler");
onClickHandler && onClickHandler.detach();
onMouseoverHandler && onMouseoverHandler.detach();
onMouseoutHandler && onMouseoutHandler.detach();
},
initializer : function(config) {
var container = Y.one("[id=" + this.get("containerId") + "]");
this.set("container", container);
this.set("onMouseoverHandler", container.delegate("mouseover",
this._mouseover, "tr", this ));
this.set("onMouseoutHandler", container.delegate("mouseout",
this._mouseout, "tr", this ));
this.set("onClickHandler", container.delegate("click",
this._click, "tr", this ));
},
_mouseout : function(e) {
e.currentTarget.removeClass("indicated");
},
_mouseover : function(e) {
e.currentTarget.addClass("indicated");
}
});
Y.namespace("mypackage");
Y.mypackage.enhanceTable = function(containerId) {
var enhancedTable new EnhancedTable({containerId:containerId});
};
}, '0.0.1', {
requires : [ 'base', 'node' ]
});
单击处理程序将向我的应用程序提交一个请求,该请求将更改页面。我是否需要记住所有的enhancedTable对象并让一个onunload处理程序调用每个对象的destroy方法?或者 YUI 框架会处理这个问题吗?
这个问题的最后一部分是,我还有在此之外的代码,通过替换
的内容来替换整个表。这样做时,脚本将重新运行并使用新的 EnhancedTable
扩充新的 。我是否需要记住旧表,并在新表破坏它之前销毁它?
When should destroy be called? Does it ever get called automatically by YUI lifecycle? Does the page unload cause the YUI lifecycle to call destroy on all objects created during the page processing? I have been working under the assumption that I need to make all my own calls to destroy but that gets hairy when ajax calls replace sections of code that I had progressively enhanced. For example:
<div id="replaceMe">
<table>
<tr>
<td>1</td>
</tr>
<tr>
<td>2</td>
</tr>
</table>
<script>
YUI().use('my-lib', function(Y) {
Y.mypackage.enhanceTable("replaceMe");
});
<script>
</div>
The my-lib
module basically adds a click handler and mouseover for each row:
YUI.add('my-lib', function(Y) {
function EnhancedTable(config) {
EnhancedTable.superclass.constructor.apply(this, arguments);
}
EnhancedTable.NAME = "enhanced-table";
EnhancedTable.ATTRS = {
containerId : {},
onClickHandler : {},
onMouseoverHandler : {},
onMouseoutHandler : {}
};
Y.extend(EnhancedTable, Y.Base, {
_click : function(e) {
//... submit action
},
destructor : function() {
var onClickHandler = this.get("onClickHandler"),
onMouseoverHandler = this.get("onMouseoverHandler"),
onMouseoutHandler = this.get("onMouseoutHandler");
onClickHandler && onClickHandler.detach();
onMouseoverHandler && onMouseoverHandler.detach();
onMouseoutHandler && onMouseoutHandler.detach();
},
initializer : function(config) {
var container = Y.one("[id=" + this.get("containerId") + "]");
this.set("container", container);
this.set("onMouseoverHandler", container.delegate("mouseover",
this._mouseover, "tr", this ));
this.set("onMouseoutHandler", container.delegate("mouseout",
this._mouseout, "tr", this ));
this.set("onClickHandler", container.delegate("click",
this._click, "tr", this ));
},
_mouseout : function(e) {
e.currentTarget.removeClass("indicated");
},
_mouseover : function(e) {
e.currentTarget.addClass("indicated");
}
});
Y.namespace("mypackage");
Y.mypackage.enhanceTable = function(containerId) {
var enhancedTable new EnhancedTable({containerId:containerId});
};
}, '0.0.1', {
requires : [ 'base', 'node' ]
});
The click handler would submit a request back to my application that would change the page. Do I need to remember all the enhancedTable objects and have an onunload
handler call the destroy method of each? Or does the YUI framework take care of this?
The last part of this quesiton is, I also have code outside of this that replaces the whole table by replacing the content of the <div id="replaceMe">
. In doing so, the script would get re-run and augment the new <table>
with a new EnhancedTable
. Do I need to remember the old table, and destroy it before the new table clobbers it?
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我不是将处理程序设置为属性,而是将它们全部存储在一个数组中,如下所示:
然后添加一个执行以下操作的析构函数方法
它完成了相同的事情,但您的工作量却少了!
理想情况下,您无需针对每个表运行此操作,而是将所有委托附加到
#replaceMe
,这样每次更改内容时都不需要重新创建它,无论更改发生在哪里。YUI 不会在卸载时自动调用
.destroy()
,但它会清理 DOM subs。以上是额外的功劳,只有当您要自己销毁该物体时才需要这样做。Instead of setting handlers as attributes I'd store them all in an array like this:
Then add a destructor method that does the following
It accomplishes the same thing but with way less work on your part!
Ideally instead of running this against each table you'd attach all your delegates to
#replaceMe
so that it wouldn't need to be recreated each time you changed the content, no matter where that happened from.YUI won't automatically call
.destroy()
for you on unload, it will clean up DOM subs though. The above is extra credit that's really only necessary if you are going to be destroying the object yourself.