[Javascript] accessing a form element

[Matt Barton]

Hi there.

I'd do something like this (usual caveat applies: I haven't tested this, and
it may be riddled with typo's, but it should give you an idea....)

<!-- Start -->
<input type="image" id="theinput" src="/pics/image1.png">
<script language="javascript">
var oInput = document.getELementById ("theinput");
var oImage1=new Image();
var oImage2=new Image();
var bFlag = true
oImage1.src="/pics/image1.png";
oImage2.src="/pics/image2.png";

// this function will do the image swapping - call it with your settimeout
method
function swapImages () {
    if (bFlag) {
        bFlag = false;
        oInput.src = oImage1.src;
    } else {
        bFlag = true;
        oInput.src = oImage2.src;
    }
    setTimeout ("swapImages();", 500);
}

setTimeout ("swapImages();", 500);

</script>
<!-- Fin -->

Hope this help

Matt

----- Original Message ----- 
From: "Günther Mittermayer" <g_mitter at web.de>
To: <javascript at LaTech.edu>
Sent: Monday, April 05, 2004 2:21 PM
Subject: [Javascript] accessing a form element


Hi all,

I'm kind of stuck here.
I have an application that has a form, in which a image button must have its
image swapped periodically.

My idea was to have a javascript script swapping the "src" attribute of the
image button.  I have already lost a lot of time trying to have it working,
but it simply doesn't. I get the following error:

Error: document.form1.image1 has no properties.

Can anyone help me finding out what's wrong?? Any help is welcome!!!!! I
said ANY!

thanx in advance!!
Günther.
=======
Here is some code:

the javascript function:
function refresh_image()
{
//Refreshes the image
document.form1.image1.src="whatever.png";
setTimeout('refresh_image();',500);
}

and the form looks like this:
<form method="post" action="theaction.cgi"
enctype="application/x-www-form-urlencoded" name="form1">
      <input type="image" name="image1" src="../pics/the_image.png" />
</form>
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