如何在没有id的textarea中输入随机值? [英] how to enter a random value in a textarea without an id?

问题描述

我必须使用油脂猴子脚本在网站的textarea中输入一个随机值，文本区域中没有id，所以document.getElementById不起作用.

I have to enter a random value in a textarea of a web site by using grease monkey script the text area didn't have an id so document.getElementById doesn't work.

我可以使用另一种方法吗?

Can I use another method to do that?

我当前的HTML显示我的textarea:

My current HTML showing my textarea:

<tr>
    <td class="tdv pd5"><span class="tbg">
        Message</span>&nbsp;</span>
    </td>
    <td class="pd5">
        <textarea name="inpx_msg" class="msgbox"></textarea>
        <br />
        <div class="tsm">140 characters max.</div>
    </td>
</tr>

推荐答案

您可以使用

You could use element.querySelector if you want to be able to specifically target an element using a CSS selector, similar to this:

var textArea = document.querySelector('table tr td.pd5 textarea.msgbox');
textArea.value = "My Random Text";

以上内容适用于以下HTML示例:

The above is working on the following HTML example:

<table>
    <tbody>
        <tr>
            <td class="tdv pd5"><span class="tbg">Message</span>&nbsp;</span>
            </td>
            <td class="pd5">
                <textarea name="inpx_msg" class="msgbox"></textarea>
                <br />
                <div class="tsm">140 characters max.</div>
            </td>
        </tr>
    </tbody>
</table>

---

演示 -使用element.querySelector

当然，您现在可以将CSS选择器更改为您想要匹配DOM层次结构的任何内容.使用element.querySelector有很多灵活性.

Off course, you can now change the CSS selector to anything you like to match your DOM hierarchy. There is lots of flexibility using element.querySelector.

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