如何将click事件添加到元素？

问题描述

我想在纯JavaScript（不使用jQuery）中添加一个click事件到这样的元素，所以我没有 id 但是一个类：

I would like to add a click event in plain JavaScript (without using jQuery) to an element like this, so I don't have an id but a class:

<a href="http://example.com/share" class="MyClass">Yummy</a>

推荐答案

如果你没有身份证明并且不知道有任何选择器库，你希望它在旧的浏览器中工作，然后它需要更多的工作。如果你可以在上面放一个id，那就很简单了。如果没有，则需要更多代码：

If you don't have an id and don't have any selector library and you want it to work in older browsers, then it takes a bit more work. If you can put an id on it, it's quite simple. If not, it takes more code:

var links = document.getElementsByClassName("MyClass");
links[0].onclick = function() {
    // put your click handling code here
    // return(false) if you don't want default click behavior for the link
}

由于 getElementsByClassName 不是在旧浏览器中普遍可用，当不存在时，您需要垫片来实现它。或者，您可以获取文档中的所有链接：

Since getElementsByClassName is not universally available in older browsers, you would need a shim to implement it when not present. Or, you could get all the links in your document with:

var links = document.getElementsByTagName("a");

然后循环浏览该列表，直到找到你想要的那个（也许检查类名）。

and then cycle through that list until you find the one you want (perhaps checking the class name).

如果您可以在链接上添加ID：

If you can put an ID on the link:

<a href="http://braza.com/share" id="specialLink" class="MyClass" >Yummy</a>

然后，它只需要这段代码：

Then, it just takes this code:

document.getElementById("specialLink").onclick = function() {
    // add code here
}

如果您要定期执行此操作，添加事件侦听器比使用onclick属性更具可扩展性，但如果您不这样做有任何框架，那么你需要一个函数来添加一个处理旧版本IE的事件监听器。

If you're going to do this regularly, the adding an event listener is a little more extensible than using the onclick property, but if you don't have any framework, then you need a function for adding an event listener that handles older versions of IE.

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