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JavaScript, Base64 image decoding and display

Posted on 2007-04-05
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Last Modified: 2008-01-09
I would like to use JavaScript to decode a base64 encoded string and display it as a image in a browser, is that possible with JavaScript?
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Question by:gzjimfan
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4 Comments
 
LVL 15

Expert Comment

by:bpmurray
ID: 18860996
Yes.

You're very vague, so it's difficult to be more specific. I'll assume that you can send the Base64 data to the client, so you can do something like:

      var Picture = document.createElement('img');
       Picture.src = 'data:image/gif;base64,' + myBase64Data;

Then you insert this where you want it.
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Author Comment

by:gzjimfan
ID: 18861294
OK, let me explain my question again.

The server encodes the bitmap into base64 string, send to the client through a XML document, the client decodes it in JavaScript and needs to display the bitmap image in the browser. Therefore I guess I will need instructions on the client side to:

(1) do base64 decoding to a binary object
(2) display image in the browser
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Accepted Solution

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bpmurray earned 125 total points
ID: 18861736
I don't have a lot of time right now, but try something like:

<html><head>
<script type="text/javascript">
   function showThePicture(myBase64Data) {
      var picture = document.createElement('img');
      picture.src = 'data:image/gif;base64,' + myBase64Data;
      var div = document.getElementById("mydiv");
      div.appendChild(Picture);
      return true;
   }
</script>
</head><body>
<div id="mydiv" style="width:20%; height:20%;background-color: red;"></div>
<input type="button" value="Pic" onclick="return showThePicture('R0lGODlhDQAOAJEAANno6wBmZgAAAAAAACH5BAAAAAAALAAAAAANAA4AQAIjjI8Iyw3GhACSQecutsFV3nzgNi7SVEbo06lZa66LRib2UQAAOw%3D%3D');">
</body></html>
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Expert Comment

by:SpinxInc
ID: 24672810
Hey,
its not working properly,
you have to do something...

thanks,
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