如何检测文本中单个字符的onclick（）或类似内容？ [英] How can I detect onclick() or similar for individual characters in a text?

问题描述

我是Javascript的新手，想通过点击单个字符来修改文本字符串。字符串是： 0000 0000 0000 0000 表示二进制数。我希望能够通过直接单击文本将 0 切换到 1 。

I'm new to Javascript and would like to modify a text string by clicking on individual characters. The string is: 0000 0000 0000 0000 representing a binary number. I would like to be able to toggle a 0 to a 1 by clicking directly on the text.

我试图使用onclick（），但只设法检测到整个段落的点击。检测哪个字符被点击的适当方法是什么？

I have tried to use onclick() but have only managed to detect a click for the entire paragraph. What would be an appropriate method to detect which character is clicked?

推荐答案

对于这么少的字符，最简单的方法是将每个字符放在自己的范围内：

For such a small number of characters, the easiest way is to put each of them in its own span:

<span>0</span><span>0</span><span>0</span><span>0</span> <span>0</span><span>0</span><span>0</span><span>0</span> <span>0</span><span>0</span><span>0</span><span>0</span>

我还将所有这些放在一个容器中，并挂钩单击容器上的事件而不是单个跨度，所以：

I'd also put all of those in a container, and hook the click event on the container rather than on the individual spans, so:

<div id="container">
    <span>0</span><span>0</span><span>0</span><span>0</span> <span>0</span><span>0</span><span>0</span><span>0</span> <span>0</span><span>0</span><span>0</span><span>0</span>
</div>

然后将其挂钩：

var container = document.getElementById("container");
if (container.addEventListener) {
    container.addEventListener('click', clickHandler, false);
}
else if (container.attachEvent) {
    container.attachEvent('onclick', function(e) {
        return clickHandler.call(container, e || window.event);
    });
}

在点击处理程序中，使用 event.target 找出点击的跨度：

In your click handler, use event.target to find out which span was clicked:

function clickHandler(event) {
    var span = event.target;
    // Do something with the span, such as look at its `innerHTML` and
    // see if it's "0" -- if so, make it "1"; if not, make it "0"
}

更多要探索的内容：

• DOM2规范


• DOM3规范


• DOM2 HTML


• HTML5网络应用程序API

• DOM2 Specification
• DOM3 Specification
• DOM2 HTML
• HTML5 Web Application APIs

如上所示，我不得不解决某些浏览器使用标准 addEventListener ，而其他浏览器（IE8及更早版本）使用 attachEvent 。我建议使用一个很好的JavaScript库，如 jQuery ，原型， YUI ，关闭，或其他几个人。它们为您解决了这些浏览器的不一致问题，并添加了许多非常有用的实用程序功能，因此您可以专注于您想要做的事情。

As you can see above, I had to work around the fact that some browsers use the standard addEventListener, and others (IE8 and earlier) use attachEvent. I recommend using a good JavaScript library like jQuery, Prototype, YUI, Closure, or any of several others. They smooth over those kinds of browser inconsistencies for you, and add a lot of very useful utility functionality so you can focus just on what you're trying to do.

For例如，使用jQuery编写的处理程序代码：

For example, that handler code written using jQuery:

$("#container").on("click", "span", function() {
    // `this` refers to the span that was clicked; you can use
    // `innerHTML` as above, or wrap it in a jQuery instance
    // like this:
    //    var $this = $(this);
    // ...and then use jQuery's `html` function to both
    // retrieve and set the HTML.
});

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