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Javascript > Filter upload dialog

Posted on 2004-08-18
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Last Modified: 2006-11-17
How can i filter an upload dialog (using Browse control) to only dispay images? (GIF, PNG, JPG, JPEG, BMP)

Thanks
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Question by:shaun341
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Expert Comment

by:Squew01
ID: 11856108
W3C (web standard) defines the 'accept' argument to use like this:
<input type="file" accept="image/gif">
but unfortunatly this seems to work only in some version of netscape!!!!!
Sorry...

A good solution would be to use a server side script based on mime type of the uploaded file.
This is quite easy to do with PHP. Ask me for some help if you wanna...

/squew/
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by:shaun341
ID: 11937431
Thanks for your reply, its not really an option in javascript it appears then.

How can i do it in PHP?
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Accepted Solution

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Squew01 earned 200 total points
ID: 11940523
You can verify the kind of file using the mime-type. This info is givent by the browser to the web server.

When you upload a file with PHP, the browser gives infos about the uploaded file. Those info are automaticly stored into variables.
Ex. if you store the uploaded file in the $file var, $file_type will store the mime type of the file. (more info here: http://www.zend.com/manual/features.file-upload.php)

So, you just have to check the mime-type of the file, like this:

if(($file_type!="image/x-png")&&($file_type!="image/pjpeg")&&($file_type!="image/gif")&&($file_type!="image/bmp")&&($file_type!="text/xml"))
{
//file is not an image
}
else
{
//file is an image
}

Here is a list of existing mime-type :

image/gif
image/jpeg
image/pjpeg
image/tiff
image/x-png
image/x-xbitmap
image/bmp
image/x-jg
image/x-emf
image/x-wmf

Hopes this help and sorry for my english which is not as good as I want.

/squew/
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