Error with Item Handler on replicant

I have set up an itemhandler on a feild (linked_page) in a replicant 'or' container (link: min=1, default=1). The issue that I am having is that when the form loads, the item handler is not working for the inital instance of the feild. If I add a second instance, then the item handler works and kicks off the function. Also, if I move the second instance up, then it no longer has a working itemhandler, and the broken instance that moves down is now working.

What is really confusing me is that I have an almost identical handler created on a feild (linked_page) that is in the same link container (it is common code). This one works just fine when the form is added.

Code:

function itemHandlers() { //called in Init
// Broken Item Handler
IWEventRegistry.addItemHandler(/article/Tab One/reusable_content/link_list/link/reusable_content/linked_page", "onItemChange", lookupDCR);

// Working Item Handler
IWEventRegistry.addItemHandler(/article/Tab Two/additional_content/related_links/link/reusable_content/linked_page", "onItemChange", lookupDCR);
}

- From /link/... down is all common code
- Tab One/reusable_content is a container with just name and location
- Tab One/reusable_content/link_list is a container with just name and location
- Tab Two/additional_content is a container with default 0, min 0, 'or'
- Tab Two/additional_content/related_links is a container with just name and location

Any one have an idea what I am missing?

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Comments

balzer

After doing more testing, I also noticed that my Item handlers are not working when I go back in to edit a dcr. The item handlers are being kicked off by an Init function. Does that only happen on the intial load, or every load?

Adam Stoller

Without seeing more of the context (the DCT, the FormAPI code) it's a little difficult to tell - but let's start with some basics:

Hopefully something in the above will help you figure out what's going wrong - let us know what you find out...

balzer

- I do not have other item handlers for the same items, so there is no issue with them being over written.

- i entered alerts and the function that declares the item handlers gets called, but the fuction that gets invoked "onItemChange" does not get called. Again it does not get called for the first instance of the replicant, any instances that are added all work correctly.

- the code for look up DCR:
function lookupDCR(item) {
// This function looks up the DCR of the related page
alert("LookupDCR");
var path = item.getName();
var path = path.replace("linked_page", "dcr");
var linkedPage = item.getValue();
var params = new Object();
params.file = linkedPage;
params.returnPath = path;
var server = window.location.hostname;
params.servername = server;
IWDatacapture.callServer("http://"+server+"/iw-bin/ulweb/getDCR.cgi", params, false);
}

But it never gets past the alert for the error case.

I did find one workaround for this, but it is not ideal. If I change the "reusable_content" container from just name and location to name, location, min="0" default="0" and then add an instance, everything works correctly. The reason I dont want to do this is that I want to make the container manditory.

Thoughts?

Adam Stoller

- I do not have other item handlers for the same items, so there is no issue with them being over written.

Okay - that's one potential issue covered.

- i entered alerts and the function that declares the item handlers gets called, but the fuction that gets invoked "onItemChange" does not get called. Again it does not get called for the first instance of the replicant, any instances that are added all work correctly.[...]

But it never gets past the alert for the error case.

I'm confused - do you get the alert but the script doesn't appear to execute for the first instance, or do you not get the alert for the first instance at all?

If the former - you need to put more alerts in there (like after every code line) so you can pinpoint where its breaking.

I did find one workaround for this, but it is not ideal. If I change the "reusable_content" container from just name and location to name, location, min="0" default="0" and then add an instance, everything works correctly. The reason I dont want to do this is that I want to make the container manditory.

Try specifying min="1" default="1" if you want it to be mandatory.

If the above doesn't help, try posting the DCT (as an attachment) so we can at least have a sense of what you're working with.

balzer

It has been awhile since I asked the question, but I did find a solution and wanted to come back around and complete the post.

The issue I was facing was that any preexisting replicants were not being added to the

IWEventRegistry.addItemHandler(/article/Tab One/reusable_content/link_list/link/reusable_content/linked_page", "onItemChange", lookupDCR);

to solve this, on Init I looped through all of the existing items of the replicant and set the ItemHandler on each of them, and then set the one on the container to cover any that I add later.