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.
|Free Today: September Issue of Linux Journal (Retail value: $5.99)||Sep 27, 2016|
|nginx||Sep 27, 2016|
|Epiq Solutions' Sidekiq M.2||Sep 26, 2016|
|Nativ Disc||Sep 23, 2016|
|Android Browser Security--What You Haven't Been Told||Sep 22, 2016|
|The Many Paths to a Solution||Sep 21, 2016|
- Free Today: September Issue of Linux Journal (Retail value: $5.99)
- Readers' Choice Awards 2013
- Android Browser Security--What You Haven't Been Told
- Epiq Solutions' Sidekiq M.2
- The Many Paths to a Solution
- Securing the Programmer
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Nativ Disc
- Identity: Our Last Stand
Pick up any e-commerce web or mobile app today, and you’ll be holding a mashup of interconnected applications and services from a variety of different providers. For instance, when you connect to Amazon’s e-commerce app, cookies, tags and pixels that are monitored by solutions like Exact Target, BazaarVoice, Bing, Shopzilla, Liveramp and Google Tag Manager track every action you take. You’re presented with special offers and coupons based on your viewing and buying patterns. If you find something you want for your birthday, a third party manages your wish list, which you can share through multiple social- media outlets or email to a friend. When you select something to buy, you find yourself presented with similar items as kind suggestions. And when you finally check out, you’re offered the ability to pay with promo codes, gifts cards, PayPal or a variety of credit cards.Get the Guide