我试图写一个小的Greasemonkey脚本实现某些任务的Facebook，喜欢躲在新闻等。

I'm trying to write a little Greasemonkey script for achieving some tasks in Facebook, like hiding news and such.

的问题是：我具有ID到未现有尚未在DOM的元素。这是击中后的箭头图标时，屏幕上出现的小盒子。

The problem is: I'm having an ID to an element which isn't existing yet in the DOM. It's the little box which appears when hitting a post's arrow-icon.

如何创建通过jQuery的事件处理程序而一旦触发的元素存在？

How can I create an event handler through jQuery which fires as soon as the element exists?

推荐答案

这是一个常见的​​问题。您可以在行动AJAXed-中的元素，因为它们出现使用的 waitForKeyElements（）实用。 （见 例如火的Greasemonkey在AJAX请求脚本。）

This is a common problem. You can act on AJAXed-in elements as they appear by using the waitForKeyElements() utility. (See "Fire Greasemonkey script on AJAX request" for example.)

我不知道你所说的击中后的箭头图标时，屏幕上出现的小盒子的意思，但在一般情况下，你会：

I'm not sure what you mean by "the little box which appears when hitting a post's arrow-icon", but in general, you would:

请确保您的脚本有jQuery的。这种添加到元数据部分，如果它不存在的话：

Make sure your script has jQuery. Add this to the metadata section, if it's not there already:

// @require http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js

要求，在 waitForKeyElements ：

// @require https://gist.github.com/raw/2625891/waitForKeyElements.js

写您的处理函数，并将其激活：

Write your handler function and activate it:

function hideTheNews (jNode) {
    //***** YOUR CODE HERE *****
    jNode.hide (); // For example
}

waitForKeyElements ("*APPROPRIATE jQuery SELECTOR*", hideTheNews);