I'm trying to modify the HTML markup of a page in order to add some button using JavaScript.
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.
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.
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.');">
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);
}
This code obviously places the button straight at the end of my document, just after the form (named flotta).
I realized I cannot use the function getElementById because the <td> tag just before the buttons does not have an id associated.
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>
setAttributeto set button properties; use direct properties instead, likeelement.type = "button";. Especially do not use that syntax to assign event handlers, just useelement.onclick = foo;(or one of the standard DOM level 2 functions).