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面试准备

Ajax 面试题与答案

Test your skills through the online practice test: Ajax Quiz Online Practice Test

问题 26. How do I submit a form or a part of a form without a page refresh?

When creating a form make sure that the "form" element "onSubmit" attribute is set to a JavaScript function that returns false.
<form onSubmit="doAJAXSubmit();return false;" >
<input type="text" id="tf1" />
<input type="submit" id="submit1" value="Update"/>

You can also submit data by associating a function with a form button in a similar way.

<form onSubmit="doAJAXSubmit();return false;" >
<input type="text" id="tf1" />
<input type="button" id="button1" onClick="doAJAXSubmit()" value="Update"/>

Note that the form "onSubmit" attribute is still set. If the user hits the enter key in the text field the form will be submitted so you still need to handle that case.
When updating the page it is recommend you wait to make sure that the AJAX update of the form data was successful before updating the data in the page. Otherwise, the data may not properly update and the user may not know. I like to provide an informative message when doing a partial update and upon a successful AJAX interaction I will then update the page.

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问题 27. How do I test my AJAX code?

There is a port of JUnit for client-side JavaScript called JsUnit

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问题 28. What exactly is the W3C DOM?

The W3C Document Object Model (DOM) is defined by the W3C as the following: The Document Object Model is a platform- and language-neutral interface...

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问题 29. When will HTML_AJAX have a stable release?

Once all the major features are complete and the API has been tested, the roadmap gives an idea of whats left to be done.

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问题 30. What parts of the HTML_AJAX API are stable?

We don't have a list right now, but most of the API is stable as of 0.3.0. There should be no major changes at this point, though there will be lots of new additions.

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