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Setting the SRC of an image.

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iaresean

iaresean

Programmer
Joined
Mar 24, 2003
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570
Location
ZA
Hey all I have the following code, which works fine in IE, but has no effect in FireFox.

Basically I want to set the src of the image object to that of the selected image so that the client can preview the image before uploading.

Here is the code snippet:
Code: 
<input class="FormField" onchange="document.getElementById('imgPreview').src=this.value" type="file" id="inpFile" style="position: relative; width:300px;" />
<img id="imgPreview" src="../../../_Images/shim.gif" height="80" alt="Image Preview" />

Does anyone know what I am doing wrong?

Any and all help is GREATLY appreciated.

Sean. [peace]
 
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A bit of guesswork here... but try it annyway:

Code: 
onchange="imageName = 'file:///' + escape(this.value.split('\\').join('/')); imageName = imageName.split('%3A').join(':'); document.getElementById('imgPreview').src = imageName;"

Hope this helps,
Dan

Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch
[/tt]
 
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Hi Billyray,

Nice try, but no cigar. :-(

I still don't see any javascript errors in the firefox console. I am beginning to wonder if the onchange event ever gets fired.... hmmm - let me try an alert.

In the mean time, I am open to any all suggestions.

Thanks again for the effort;

Sean. [peace]
 
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Wierd, the alert works fine and does post the correct filename.

Sean. [peace]
 
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[tt]
<input class="FormField" onchange="document.getElementById('imgPreview').src=[blue]'file:///'+this.value.replace(/\\/g,'/')[/blue]" type="file" id="inpFile" style="position: relative; width:300px;" />
<img id="imgPreview" src="../../../_Images/shim.gif" height="80" alt="Image Preview" />
[/tt]
 
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Hi tsuji,

Thanks for the post, but that didn't work either. :-/

Do I perhaps have to invoke some sort of refresh() command for firefox to fetch the image into the object perhaps?

Thanks for any and all help!

Sean. [peace]
 
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Syntactically, it is as shown. (You can test it on your local system, ie, not through the web server.) It is the security setting which blocks the display, in case the page is served via a web server. (If you right-click on the image and choose show, it will show up correctly.)
 
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So is this a FireFox security setting that states that images cannot be dynamically reassigned when the page was server from a web server?

When you say local, do you mean not via my local web server, but on a basic html file stored on my local pc that I just open?

This is turning out to be far more complicated than I would have thought.

Sean. [peace]
 
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>When you say local, do you mean not via my local web server, but on a basic html file stored on my local pc that I just open?
I just meant simply local file system, not through web server to deliver the file. Open htm by double-click sort of thing.
 
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Ok, so I did understand you correctly.

Sean. [peace]
 
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So is there absolutely no way that I can do this? :-(

Sean. [peace]
 
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Yes there is. The code I showed above should have worked... But anyway - this works 100% fine locally (from my HDD) in both IE and Firefox:

Code: 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "[URL unfurl="true"]http://www.w3.org/TR/html4/strict.dtd">[/URL]
<html lang="en">
<head>
	<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
	<meta http-equiv="content-language" content="en">
	<title>Image switching test</title>
	<script type="text/javascript">
	<!--

		function setImage(newSrc) {
			newSrc = 'file:///' + escape(newSrc.split('\\').join('/'));
			newSrc = newSrc.split('%3A').join(':');
			document.getElementById('imgPreview').src = newSrc;
		}
	//-->
	</script>
</head>

<body>
	<form>
		<input onchange="setImage(this.value);" type="file">
	</form>
	<img id="imgPreview" src="" height="80" alt="Image Preview">
</html>

Hope this helps,
Dan

Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch
[/tt]
 
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Aaah - sorry, I mis-understood the problem. I thought you couldn't get it working locally... but you can't get it working off of a web server.

This, as tsuji says, is a security restriction put in place a short while ago (it wasn't in the pre-v1 release of Fx, IIRC...)

You can get around this by having a form where users upload images to your server, and then you display them.

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch
[/tt]
 
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BillyRayPreachersSon,

Thanks for the effort. It is bad news about that security restriction. Very strange indeed, but I do trust FireFox and believe that they are the more powerful browser. So I am sure that FF's reason was a good one. :-(

Ok, well thanks for the information guys, at least you helped to stop me from running around in circles.

Cheers;

Sean. [peace]
 
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