image change when rollover link

snappy · April 22nd, 2007, 08:21 AM

I have a web page with a graph on it. I want the user to be able to rollover(or click) on three text links beneath that will change the original graph to another with information specific to the relevant text link. I guess its like a javascript image rollover except I want the image to change when I rollover a seperate link rather than the image itself. Any pointers?

ukgeoff · April 23rd, 2007, 08:18 AM

Use JavaScript to dynamically change the scr='... part of your img tag in the area where you are displaying the graphics.

Have a go at working it out and then come back if you get stuck.

Hint: Look at using document.getElementById(id)...

snappy · April 23rd, 2007, 04:27 PM

Well, this is what I would have used, in the olden days.

HTML Code:

<html>
<head>
<script language="JavaScript">
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


//-->
</script>
</head>
<img name="Image1" border="0" src="untitled%20folder/one.gif"><br /><br />
<a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image1','','untitled%20folder/two.gif',1)">two</a><br /><br />
<a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image1','','untitled%20folder/three.gif',1)">three</a><br /><br />
<a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image1','','untitled%20folder/four.gif',1)">four</a><br /><br />
</body>
</html>

There's a "document.getElementById" in there somewhere.
And of course, now I'm stuck!! because I'm certain the way you're going to tell me is one helluva lot slicker and less clumsy.