By James E. Harmon
Dojo bargains net builders and architects a robust JavaScript toolkit for swiftly constructing powerful Ajax purposes. Now, for the 1st time, there’s a whole, example-rich developer’s consultant to Dojo and its starting to be library of prepackaged widgets. Reviewed and recommended by way of the Dojo starting place, the creators of Dojo, this ebook brings jointly all of the hands-on tips and demonstrated code samples you want to be successful.
Expert net developer James E. Harmon starts through demonstrating tips to “Ajax-ify” latest functions and pages with Dojo, including Ajax positive factors reminiscent of buyer- and server-side validation as fast and nondisruptively as attainable. subsequent, he offers in-depth insurance of Dojo’s person interface, shape, structure, and really good Widgets, displaying how they paintings and the way to exploit them so much successfully. one of the Widgets, he covers intimately: Date Pickers, wealthy textual content Editors, combination packing containers, Expandable Outlines, and lots of others.
In end, Harmon introduces the Dojo toolkit’s strong services for simplifying Ajax improvement. He completely explains Dojo’s helper services, shortcuts, and detailed tools, illuminating each one function with examples of the JavaScript difficulties it could clear up. This section’s far-ranging assurance contains strings, JSON aid, occasion dealing with, Ajax remoting, Dojo and the DOM, trying out, debugging, and lots more and plenty extra. All resource code examples are supplied on a significant other site, together with resource code for an entire instructional case examine application.
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Extra info for Dojo: using the Dojo JavaScript library to build Ajax applications
Example text
This behavior is quite different from a regular select list, which only allows the user to select one of the listed values. If you want that behavior, simply set the forceValidOption attribute to true. However, in this case, we get some useful functionality setting it to false because it is possible that the user’s city is not in our list. The Dojo ComboBox widget is a great replacement for the standard
This will be quicker and won’t interrupt the user’s flow. We’ll also make requests to the server to get data based on values entered by the user. This step will require some additional scripts on the server to allow it to respond to these Ajax requests. The scripts are over-simplified but serve the purpose of demonstrating the features that are discussed in the tutorial. ” 13 14 Chapter 1 Understanding Dojo: A Tutorial Eye candy is the term some designers use to describe cool visual effects. Drag–anddrop in Google Maps is at least partly an eye candy feature.
In other words, Dojo will put the entered value into the format for a typical proper noun. The prompt message displays while the field is in focus. ” attribute setting causes Dojo to display a message next to the field if it fails the validation. In our case, if the user does not enter a value, then a message will appear. The trim=”true” attribute setting tells Dojo to remove any leading or trailing spaces from the entered value before sending it to the server. Now let’s run the page and see how it behaves.