addItemHandler question - passing params

pawlr

I am trying to use IWEventRegistry.addItemHandler() in TS 5.5.2. What I want to know is can I pass parameters in the function I specify, in effect writing code like this..

In the DCT Script section:

function testFunc(a,b,c,d,e) {
alert(a + b + c + d + e);
}

IWEventRegistry.addItemHandler("/replicant/video_callout", "onCallout", testFunc('1','2','3','4','5') );


In the DCT Body:

<item name="replicant">
<description>*</description>
<replicant default="0" min="0" max="99">

<item name="video_callout">
<hidden>
<callout type="cgi" label="Select Video"/>
</hidden>
</item>

</replicant>
</item>

It appears to work.. I successfully get an alert string "12345", with the only problem being that it executes when the DCT loads initially, instead of when I click the callout button.. this will render my approach unusable if there's something I'm missing here (there probably is)

Edited by pawlr on 08/18/04 10:38 AM (server time).

Dwayne

No, the parameters passed to an item handler routine are fixed. The reason you're seeing the behavior you are is because you're not passing a reference to the function when you try to set the item handler. You're actually invoking the function, and then passing the return code into the set item handler function. Not what you intended at all.

If you really need parameters into your handler function (presumably becuse you want to use the same function in multiple items, but with slightly different behavior) would be to create one "wrapper" function for each possible set of parameters, and then set that as the item handler. The other alternative would be to create an array of parameters, keyed off of the XPath to the item.

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Current project: TS 5.5.2/6.1 W2K