使用 Javascript 将按钮添加到 HTML 页面

Question

I'm trying to modify the HTML markup of a page in order to add some button using JavaScript.我正在尝试修改页面的 HTML 标记，以便使用 JavaScript 添加一些按钮。

Below you can find a "snippet" (quite long, I apologize, but I really need you to get the structure of the page) of the page I am trying to modify.您可以在下面找到我正在尝试修改的页面的“片段”（很长，我很抱歉，但我真的需要您了解页面的结构）。

My JavaScript code is inserted by a browser extension (I can successfully add the JavaScript to the page and make it run) and the only operation it should do is to add a button into the right position.我的 JavaScript 代码是由浏览器扩展插入的（我可以成功地将 JavaScript 添加到页面并使其运行），它应该做的唯一操作是在右侧 Z4757FE07FD492A8BE60EA6A760EZ63 中添加一个按钮。

The HTML page contains a <FORM> with a table in it. HTML 页面包含一个<FORM> ，其中包含一个表。
After some rows and cells there is a cell which contains 3 input buttons:在一些行和单元格之后，有一个包含 3 个输入按钮的单元格：

<input type="submit" name="submit" value="Set Ships">
<input type="button" name="sel" value="Select all" onclick="alert('Not Allowed.');">
<input type="button" name="desel" value="Deselect all" onclick="alert('Not Alloowed.');">

I would like my JavaScript code to place a fourth button just after the desel button.我希望我的desel代码在取消按钮之后放置第四个按钮。 This is the code I use to add the button:这是我用来添加按钮的代码：

function add() {
    var element = document.createElement("input");
    element.setAttribute("type", "button");
    element.setAttribute("value", "invert");
    element.setAttribute("name", "button3");
    element.setAttribute("onclick", "foo()");
    document.flotta.appendChild(element);
}

This code obviously places the button straight at the end of my document, just after the form (named flotta ).这段代码显然将按钮直接放在我的文档末尾，就在表单之后（名为flotta ）。

I realized I cannot use the function getElementById because the <td> tag just before the buttons does not have an id associated.我意识到我不能使用 function getElementById因为按钮之前的<td>标签没有关联的id 。

Thus I ask if anyone can point me to a solution to add the fourth button into the right place.因此，我问是否有人可以指出我将第四个按钮添加到正确位置的解决方案。

<html>
    <head>
    <title>fee foo</title>  
        . . . head code
    </head>

<body >
    <div id="Layer" name="Layer" /*other attributes*/"></div>
    <table /*table attributes*/>
    . . . table content
    </table>
<form id="flotta" name="flotta" method="post" action="home.php?sel=gestioneflotta">
    <table /*table attributes*/>
        <tbody>
            <tr><td>
            <table /* attributes*/>
                <tbody><tr>
                <td /* attributes*/></td>
                <td /* attributes*/></td>
                <td /* attributes*/></td>
                </tr>
                <tr>
                <td /* attributes*/">&nbsp;</td>
                <td bgcolor="ffffff" background="bg/pergamena.jpg" align="center">
                <input type="submit" name="submit" value="Set Ships">
                <input type="button" name="sel" value="Select all" onclick="alert('Not Allowed.');">
                <input type="button" name="desel" value="Deselect all" onclick="alert('Not Alloowed.');">   </td>
                <td background="bg/menu_d.gif">&nbsp;</td>
                </tr>
                <tr>
                <td /* attributes*/" width="11" height="11"></td>
                <td /* attributes*/></td>
                <td /* attributes*/></td>
            </tr>
            </tbody>
            </table>
        </td></tr>
            <tr>
            . . . another row
            </tr>

        </tbody>
    </table>
</form>
<table border="0" cellspacing="0" cellpadding="0" align=center  width=510>
    . . . another table
</table>

<script type="text/javascript">
some script
</script>
</body>

</html>

Answer 1

The following code should get the td:下面的代码应该得到 td：

var td = document.getElementsByName('desel')[0].parentNode;

Basically, it gets all the fields/buttons with the name 'desel' and, assuming there's only one, gets the parent of the first element (which should be the td that contains the buttons).基本上，它获取所有名称为“desel”的字段/按钮，并且假设只有一个，获取第一个元素的父元素（应该是包含按钮的 td）。

使用 Javascript 将按钮添加到 HTML 页面

问题描述

1 个解决方案

解决方案1
6 已采纳 2011-05-25 10:54:45

使用 Javascript 将按钮添加到 HTML 页面

问题描述

1 个解决方案

解决方案1 6 已采纳 2011-05-25 10:54:45

解决方案1
6 已采纳 2011-05-25 10:54:45