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Web Page Button with Save As option

This is the web page where I have the sample code I am working with. I want to use javascript to create a button that will allow the user to download the image they see on the screen. So far all I have been able to get is the image in a new page with no header. What I want is a "Save As" pop up option. How can I accomplish this.

http://www.mrtechnology1954.com/santaclaus/santa24.html

Thank you!

Robert
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Robert Ehinger
Asked:
Robert Ehinger
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2 Solutions
 
pinishCommented:
Try:-

<script>
function SaveFile(fname){
img.document.execCommand('saveas', null ,fname)
}
</script>

<iframe id="img" src="yourimage.jpg" width="(image width + 20)px" height="(image height + 25)px" scrolling="no" frameborder="0px"></iframe>


<button onclick="SaveFile('yourimage.jpg');">save as</button>
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Robert EhingerIT specialistAuthor Commented:
That works except there is one small problem. I now have a black rectangle above the image and next to the save as button. What did I do wrong to cause that?
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pinishCommented:
To be completely fair it is a bit of a hack and probably doesn't work in some  browsers.

Better way to do this is server side - do you have PHP or something like that available to you?  The "correct" way is to force the content type which will prompt the client to download rather than display the image - there are loads of examples to do it that way.  If you still really want a javascript button you can set the action to be the server side script which will do the same thing.
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jb1devCommented:
The best way  to do this really is on the server.

Some other options are the HTML5 download attribute, that is for link, not button:
http://davidwalsh.name/download-attribute
Though that doesn't work on my browser. (Firefox, Ubuntu)

You could also base64 encode the image. Though your image is huge. See example:
http://jsfiddle.net/5whKM/

I've seen people claim they can extract the the img src and change the type to data:application/octet-stream forcing the browser to open a Save As dialog, but again I cannot recreate this in my env.
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Robert EhingerIT specialistAuthor Commented:
I have Dreamweaver CS4 which is what I used to build all the pages associated with this site. I can easily add a button to the page but I don't know where to go to get the appropriate actions that I want associated with the button.
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jb1devCommented:
I think what pinish and I are both saying is that the proper way to do this is to use a server side script to set the content type and serve the image.

Do you have php available on your server?

Any javascript actions you can associate with the button are client side scripts only and will not actually do what you are looking for.
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Robert EhingerIT specialistAuthor Commented:
the server where this will ultimately reside does not have php available. Are there any other options? If I have to use the javascript how can I control the size of the image and is there a way to have it centered on the screen when it is opened?
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Robert EhingerIT specialistAuthor Commented:
The owner of the web site decided he just needed for the visitor to be able to print the image with no header. That has been accomplished so the problem is resolved.
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