使用冒泡 (JavaScript/jQuery) 将事件处理程序绑定到特定元素

发布于 2024-08-24 23:08:42 字数 672 浏览 4 评论 0原文

我正在开发一个类似于 Firebug 检查器工具功能的项目。也就是说,当鼠标悬停在页面上的元素上时,我想突出显示它们(通过更改其背景颜色),当单击它们时,我想执行一个函数来构建可以使用的 CSS 选择器来识别他们。

然而,我遇到了与事件冒泡相关的问题,并且彻底迷惑了自己。与其引导您沿着这条路走下去,不如解释一下我正在尝试做什么并寻求一些入门帮助,这可能更有意义。以下是一些规格:

  • 我只对包含文本节点的元素(或任何具有文本节点的后代元素)感兴趣。
  • 当鼠标进入此类元素时,更改其背景颜色。
  • 当鼠标离开该元素时,将其背景颜色更改回原来的颜色。
  • 单击某个元素时,执行一个为该元素构建 CSS 选择器的函数。
  • 我不希望将鼠标悬停在元素的边距区域上算作该元素的鼠标悬停,而是将鼠标悬停在下面的元素上(我认为这是默认的浏览器行为?)。

我可以处理突出显示/取消突出显示的代码,并构建 CSS 选择器。我主要遇到的问题是将事件处理程序有效地绑定到我想要突出显示/可点击的元素,并避免/停止冒泡,以便将鼠标悬停在 (

) 元素上也不会执行处理程序函数例如,在上。我认为正确的方法是将事件处理程序绑定到文档元素,然后以某种方式使用冒泡仅在最顶层元素上执行绑定函数,但我不知道该代码是什么样的,这确实是我可以在哪里需要帮助。

我正在使用 jQuery,并且希望尽可能地依赖它。

I'm working on a project that approximates the functionality of Firebug's inspector tool. That is, when mousing over elements on the page, I'd like to highlight them (by changing their background color), and when they're clicked, I'd like to execute a function that builds a CSS selector that can be used to identify them.

However, I've been running into problems related to event bubbling, and have thoroughly confused myself. Rather than walk you down that path, it might make sense just to explain what I'm trying to do and ask for some help getting started. Here are some specs:

  • I'm only interested in elements that contain a text node (or any descendant elements with text nodes).
  • When the mouse enters such an element, change its background color.
  • When the mouse leaves that element, change its background color back to what it was originally.
  • When an element is clicked, execute a function that builds a CSS selector for that element.
  • I don't want a mouseover on an element's margin area to count as a mouseover for that element, but for the element beneath (I think that's default browser behavior anyway?).

I can handle the code that highlights/unhighlights, and builds the CSS selector. What I'm primarily having trouble with is efficiently binding event handlers to the elements that I want to be highlightable/clickable, and avoiding/stopping bubbling so that mousing over a (<p>) element doesn't also execute the handler function on the <body>, for example. I think the right way to do this is to bind event handlers to the document element, then somehow use bubbling to only execute the bound function on the topmost element, but I don't have any idea what that code looks like, and that's really where I could use help.

I'm using jQuery, and would like to rely on that as much as possible.

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童话里做英雄 2024-08-31 23:08:42

您可以向 document.body 添加事件侦听器。处理函数可以检查事件以找出最初的目标元素。如果您使用的是 Prototype 库,则可以使用:

http://prototypejs.org/api/event /element

我知道您正在使用 jQuery,但我确信它具有相同的功能;我只是对它不太熟悉。

You can add an event listeners to document.body. The handler function can inspect the event to figure out which element was originally targeted. If you were using the Prototype library, you would use this:

http://prototypejs.org/api/event/element

I know you're using jQuery, but I'm sure it has equivalent functionality; I'm just not as familiar with it.

痴骨ら 2024-08-31 23:08:42

这将是一个相当大的问题,因为您无法直接设置文档中文本节点的样式。这意味着,如果您有这样的内容:

<div>
  Hello world how are you
  <ul>
    <li>First of all, it is a lovely day outside</li>
    <li>Second, it's important that you
      <a href='http://somewhere.else'>click here</a>
    </li>
  </ul>
</div>

那么,当您尝试重新设置

头部的文本块的样式时,您需要以这样的方式进行操作:

的其余部分也不会获得新的背景颜色。 (至少,我认为这就是您所要求的。)

有一个 jQuery 的“突出显示”插件,您可以将其视为如何使用 具有某些给定类别的标签。该插件旨在让您设计您搜索的单词/短语的样式,但它并不是非常复杂,您也许能够适应它。该插件在这里: http://johannburkard .de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html

This is going to be fairly problematic, because you can't directly style the text nodes in your document. That means that if you've got something like this:

<div>
  Hello world how are you
  <ul>
    <li>First of all, it is a lovely day outside</li>
    <li>Second, it's important that you
      <a href='http://somewhere.else'>click here</a>
    </li>
  </ul>
</div>

Well when you try to restyle the text block at the head of that <div>, you'll need to do it in such a way that the rest of the <div> doesn't also get a new background color. (At least, I think that's what you're asking for.)

There's a "highlight" plugin for jQuery that you might look at as a guide to how you can replace simple text nodes with <span> tags that have some given class. The plugin is intended to let you style words/phrases that you search for, but it's not terribly complicated and you might be able to adapt it. The plugin is here: http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html

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