Web Page Button with Save As option

Posted on 2013-11-27
Last Modified: 2013-12-27
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.

Thank you!

Question by:RobertEhinger
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Accepted Solution

pinish earned 500 total points
ID: 39681868

function SaveFile(fname){
img.document.execCommand('saveas', null ,fname)

<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>

Author Comment

ID: 39681979
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?

Assisted Solution

pinish earned 500 total points
ID: 39682006
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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LVL 14

Expert Comment

ID: 39682034
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:
Though that doesn't work on my browser. (Firefox, Ubuntu)

You could also base64 encode the image. Though your image is huge. See example:

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.

Author Comment

ID: 39682089
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.
LVL 14

Expert Comment

ID: 39682144
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.

Author Comment

ID: 39686382
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?

Author Comment

ID: 39738307
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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