At the Forge - Dojo Events and Ajax
Listing 3. hello.php
<? echo "Hello from the server!"; ?>
The button itself is defined as we might do with any button to which we expect to attach an event, with an id attribute. It sits inside of a very small HTML form, named “theForm”:
<form id="theForm"> <input type="button" id="theButton" value="Press here" /> </form>
Using Dojo events, we connect the button to a function (ajaxAlert):
Finally, our ajaxArgs object is bound, and we're off and running. Clicking on the button means the associated Dojo event is invoked, which is ajaxAlert. That function, thanks to dojo.io.bind, then sends its arguments to the defined URL and invokes the load function upon successful completion. This is surprisingly straightforward and opens up many possible avenues for using Ajax in applications.
The main source for information about Dojo, as well as Dojo software releases, is dojotoolkit.org. Documentation for the toolkit is still a bit sparse, but it has improved significantly in the last few months, and continued improvements seem likely, given Dojo's growing popularity. The main URL for Dojo documentation is at dojotoolkit.org/docs, and Dojo.book (the Wiki-based Dojo documentation) is at manual.dojotoolkit.org/index.html.
Finally, a noteworthy introduction to Dojo events is at www.dojotoolkit.org/docs/dojo_event_system.html.
Reuven M. Lerner, a longtime Web/database consultant, is a PhD candidate in Learning Sciences at Northwestern University in Evanston, Illinois. He currently lives with his wife and three children in Skokie, Illinois. You can read his Weblog at altneuland.lerner.co.il.
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