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Creating and Programming Custom WebItems - Custom Events for WebItems
Each custom WebItem that you define automatically gets its own Response event,
as discussed in the preceding section. You can, however, define one or more events
of your own for a WebItem. You can then embed calls to these events in the HTML
code that you return to a browser by using a slightly different syntax for the
URLFor function from that discussed in the preceding section. To implement a custom
WebItem event, take the following steps:
STEP BY STEP
17.3 Implementing a Custom WebItem Event
After you have created a custom WebItem, right-click it in the IIS project
and choose Add Custom Event from the resulting ShortCuts menu.
A new event will be added to the WebItem and will appear underneath the WebItem
in the tree with a lightning-bolt icon. It will have a generic name, which you
can change by right-clicking the event item and choosing the Rename option from
the shortcut menu.
You can embed an invocation of the event in the HTML code that you return to
the browser by using the URLFor function in the Start event procedure of the WebClass.
This technique is similar to that discussed in step 4 in the preceding section.
However, the syntax that you will use with the URLFor function differs slightly
from that of the preceding example. In the case of a custom event, you must pass
the URLFor function two arguments rather than just one. The first argument will
still be the name of the WebItem, and the new second argument will be a string
giving the name of the custom event.
Listing 17.11 gives a fragment of code from a WebClass’ Start event procedure
that uses the URLFor function to embed a hyperlink to a WebItem’s custom
CODE IN WEBCLASS_START THAT EMBEDS A HYPERLINK FOR A CUSTOM EVENT OF A WEBITEM
IN THE HTML RETURNED TO THE BROWSER
.Write "<A HREF=""" & _
URLFor(SvcResponse,"Excellent") & _
The code assumes that a custom event named Excellent belongs to a WebItem named
You would use a similar technique to that discussed in step 5 in the preceding
section to react to the user’s activation of the event’s hyperlink.
Instead of writing code in the Respond event (as the preceding example shows),
you would rather write code in the event procedure named for the custom event
that you yourself had defined.
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