JQuery - 停止所有浏览器中的事件冒泡

发布于 2024-10-19 04:10:41 字数 482 浏览 2 评论 0原文

我有一些大规模嵌套的 GUI 控件 - 当它们被单击或更改或任何我需要阻止事件在 DOM 树上进一步向上移动时。它需要在所有浏览器上运行。

此时我已经得到了一些相当笨重的 JS 代码：

//Do something in response to the original user action
//Leave it at that.
try {
        e.stopPropagation();
    }
    catch (ex) {

    }
    try {
        event.cancelBubble();
    }
    catch (ex) {

    }

    try {
        event.preventDefault();
    }
    catch (ex) { }
...

这确实有效，但它闻起来和感觉起来都是错误的（我个人讨厌空的 catch 块）。我可以使用更简洁的 x 浏览器技巧吗？

原文

I have some massively nested GUI controls - when they're clicked or changed or whatever I need to stop the event from going further up the DOM tree. It needs to work across all browsers.

At this point I've got some rather clunky JS code:

//Do something in response to the original user action
//Leave it at that.
try {
        e.stopPropagation();
    }
    catch (ex) {

    }
    try {
        event.cancelBubble();
    }
    catch (ex) {

    }

    try {
        event.preventDefault();
    }
    catch (ex) { }
...

This does work, but it smells and feels wrong (personally I loathe empty catch blocks). Is there a neater x-browser trick I can use?

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锦上情书 2024-10-26 04:10:41

如果您使用 jQuery，则只需 event.stopPropagation() 即可工作美好的。 jQuery 统一了事件处理。

一般来说，如果您想测试特殊的浏览器方法，您可以这样做：

if(event.stopPropagation) {
    event.stopPropagation();
}
else if...

这就是 jQuery 正在做的事情。它为事件创建包装器并提供统一的接口。

事件对象的名称由您定义。事件对象作为第一个参数传递给事件处理程序。您必须设置事件处理程序以接受参数，例如：

$('selector').click(function(foo) { // could be event, e, bar, whatever you want
    foo.stopPropagation();
});

通常使用e或event。

If you use jQuery then just event.stopPropagation() will work fine. jQuery unifies the event handling.

In general if, you want to test for special browser methods, you can do like so:

if(event.stopPropagation) {
    event.stopPropagation();
}
else if...

This is what jQuery is doing. It creates a wrapper for the event and provides a unified interface.

The name of the event object is defined by you. The event object is passed as first argument to your event handler. You have to setup the event handler to accept a parameter, e.g.:

$('selector').click(function(foo) { // could be event, e, bar, whatever you want
    foo.stopPropagation();
});

Typically e or event are used.

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南街九尾狐 2024-10-26 04:10:41

cancelBubble 是一个布尔属性，而不是 Event 对象的方法。不需要 try/catch，因为您可以在使用之前测试所需的属性或方法。因此，如果没有 jQuery，以下代码将执行您想要的事件对象 e 操作：

if (typeof e.stopPropagation != "undefined") {
    e.stopPropagation();
} else if (typeof e.cancelBubble != "undefined") {
    e.cancelBubble = true;
}

cancelBubble is a Boolean property rather than a method of Event objects. There's no need for try/catch because you can test for the property or method you need before using it. So, without jQuery, the following will do what you want for an event object e:

if (typeof e.stopPropagation != "undefined") {
    e.stopPropagation();
} else if (typeof e.cancelBubble != "undefined") {
    e.cancelBubble = true;
}

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