My question:

...

You wouldn't know how to test if a REQUEST.image1 exists or not before actually using manage_addImage or manage_upload on that image?

Alexander Staubo [mailto:alex@mop.no] :

Test on the content type of the file object, or check whether the file object's file attribute contains a non-zero file (eg., call seek(0, 2) and then check if tell() returns > 0).

The following code illustrates the latter:

<dtml-if "REQUEST.has_key('MyFile')"> <dtml-if "(MyFile.file.seek(0, 2) or MyFile.file.tell()) > 0"> <!-- file is valid --> </dtml-if> </dtml-if>

Excellent! Thanks! It works. I don't yet understand how, but it works. For others who may have a problem with saving non-existent images from form uploads the answer is to use the above code modified to your specific circumstances (see below). In my example, I am using <input type=file name=image1> in my submit form. In case the user doesn't choose an image to be uploaded, we need to do the following check in the dtml-method that handles the submit form: <dtml-if "REQUEST.has_key('image1')"> <dtml-if "(REQUEST.image1.seek(0, 2) or REQUEST.image1.tell()) > 0"> <dtml-with "_[i1name]"> <dtml-call "manage_upload(image1, REQUEST.image1)"> </dtml-with> </dtml-if> </dtml-if> Comments: 1st line checks if the REQUEST object (ie submitted form contents) has an attribute image1 (so we dont get errors afterwards, if we don't for some reason have that attribute in the object). 2nd line checks something :) 3rd line goes into the context of a specific image 4th line replaces the image (in context) with the image from the submit form (referenced in this case with attribute image1). Thanks again, Samu Mielonen PS I'm still a bit puzzled at how difficult this is. Shouldn't there be an easier way? I guess I could write a dtml-method to do this, but I think this could be an out of a box functionality. I mean <dtml-if image1> should just work in my naive opinion :)