使用Javascript将按钮添加到HTML页面 [英] Add button to an HTML page using Javascript
问题描述
我正在尝试修改页面的HTML标记，以便使用JavaScript添加一些按钮。
I'm trying to modify the HTML markup of a page in order to add some button using JavaScript.
下面你可以找到一个代码段（很长的，我很抱歉，但我真的需要你获得页面的结构）我想修改的页面。
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.
我的JavaScript代码由浏览器扩展插入（我可以成功地将JavaScript添加到页面并使其运行），唯一的操作是将按钮添加到正确的位置。
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.
HTML页面包含一个< FORM> ，其中包含一个表。
在一些行和单元格后面有一个包含3个输入按钮的单元格：
The HTML page contains a <FORM> with a table in it.
After some rows and cells there is a cell which contains 3 input buttons:
<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.');">
我希望我的JavaScript代码在 desel之后放置第四个按钮按钮。
这是我用来添加按钮的代码：
I would like my JavaScript code to place a fourth button just after the desel button.
This is the code I use to add the button:
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);
}
此代码显然将按钮直接放在文档的末尾，表单（名为 flotta ）。
This code obviously places the button straight at the end of my document, just after the form (named flotta).
我意识到我不能使用函数 getElementById 因为< td> 标签之前的按钮没有一个 id 关联。
I realized I cannot use the function getElementById because the <td> tag just before the buttons does not have an id associated.
所以我问是否有人可以指出一个解决方案，将第四个按钮添加到正确的地方。
Thus I ask if anyone can point me to a solution to add the fourth button into the right place.
<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*/"> </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"> </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>
推荐答案
以下代码应该得到td：
The following code should get the td:
var td = document.getElementsByName('desel')[0].parentNode;
Basi cally，它得到所有的字段/按钮，名称为'desel'，假设只有一个，获取第一个元素（应该是包含按钮的td）的父项。
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).
这篇关于使用Javascript将按钮添加到HTML页面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
