Php file upload / Javascript

freebie

Hi,
This is a javacript problem, but it is specific to PHP, since PHP wants you have have [] after the name in the file upload field.
It seems that javascript doesn't like the array brackets, so instead of being able to reference the field from within Javascript, I pass the object ('this') into the function from the event call. I think I could get around my problem using setInterval if I could reference the file field from the javascript, but I can't.
Here's the details:
I have a checkbox that is a "Remove Image?" checkbox. Now, the goal is to have this unchecked and disabled if the file field has been selected (which is named "userfile[]").

I've got part of it working. If the user selects a file, the checbox does indeed uncheck and become disabled. I'm also trying to add functionality so that if the user decides (after selecting a file) that they don't want to change the Image but remove it instead. The problem is that after clearing the contents of the file field, the checkbox remains disabled. I tried calling the same javascript function (see below) using onBlur() but it doesn't seem to have any affect. Below is the javascript and the event handler calls:
<script>
<!--
function fileFieldExcludesCheckbox(obj){
if(obj.value==""){
document.form1.RemoveImage.disabled=false;
return;
}else{
document.form1.RemoveImage.checked=false;
document.form1.RemoveImage.disabled=true;
}
}

//-->
</script>

<input type="file" name="userfile[]" size="40" value="" onfocus="javascript:fileFieldExcludesCheckbox(this)";
onSelect="javascript:fileFieldExcludesCheckbox(this)";
onChange="javascript:fileFieldExcludesCheckbox(this)";
onBlur="javascript:fileFieldExcludesCheckbox(this)";
onClick="javascript:fileFieldExcludesCheckbox(this)";

I don't think onClick is an event handler for this but I included it to show that it also has no effect. The only problem is that when a user clears the file field, the checkbox remains disabled.

Thanks in advance for any thoughts.

hand

I never heard about the fact, that PHP needs [] after file type field names.

http://php3.de/manual/en/features.file-upload.php

freebie

Hi,
Thanks for the reply.
Maybe it's not php that requires this type of naming but instead it's probably the file upload class that I'm using. But I know that the file upload doesn't work if I don't use the name "userfile[]" with the brackets. I just checked it again to make sure.
I guess I could place a reference to this object after the first event happens, and then use setInterval to keep calling the event handling function passing in the reference. I'm going to try that.

freebie

I don't know if anyone could ever use this, but I though I'd post the solution I figured out just in case. Here's the javascript:
<script language="Javascript1.2">

</script>

The the event handler is an "onFocus" event handler in the file field. Upon the event firing the function "fileFieldExlcudesCheckbox(obj) gets called with the field passed in using "this". It stores a reference to that obj in the objHolder object instance named checkboxRef. then after doing it's logic it calls setTimeout to keep calling itself and passing in the checkboxRef object.

Weedpacket

Well, form elements are stored in an array (I forget exactly what it's called - it's a property of the form), so instead of mentioning them directly as properties of the form (which is where you run into trouble with the []), you can refer to them (either by name or by number) as elements of this array.

If the first field is called "anarray[]", then that would be array['anarray[]'] or array[0] - where array is the name of this array. Consult your local Javascript reference to fill in that blank.