Hi aLL, i Wan't to know that what does getElementById Do in js?
we also use that in CrossSiteScripting attacks,
thanks
+5
A:
Most html constructs have an element called "id" which must be unique in the whole html page. Such as <div id="uniqueDiv1">. getElementById returns that HTML object. In my example, getElementById("uniqueDiv1") returns that div. You can then use it to set a style or do something with it.
laura
2010-06-28 20:26:10
And in Internet Explorer 6/7 it'll return an element whose "name" attribute has that value too. In other words, Internet Explorer is broken in this case. (I think 8 fixes this, but I'm not 100% sure.)
Pointy
2010-06-28 20:27:39
A:
It returns an element from the HTML document that has the ID attribute set to the value you ask for. For example, the JavaScript
document.getElementById('myId');
will return the first element found that matches that ID, such as
<a id="myId">Link</a>
I say the "first element found" because that's exactly what will happen--by definition, IDs must be unique in the page. Each HTML page must have only 1 ID of the same name. If you violate this rule, you'll get unexpected results.
Andrew Dunkman
2010-06-28 20:30:23
A:
getElementById allows you to access elements of a page.
Lets use this page as an example:
<html>
<head>
<title>Test Page</title>
</head>
<body>
<div id="myDIV">Hello World!</div>
</body>
</html>
document.getElemenById('myDIV').innerHTML will give you Hello World!
document.getElementById('myDIV').style.display = "none" will hide the div tag.
If you want to look at what all it can do on a live page I would suggest getting Firefox and install the Firebug addon. This will let you see all of the DOM things and play with them without having to re-save a page.
Badger
2010-06-28 20:30:52