The community is working on translating this tutorial into Italian, but it seems that no one has started the translation process for this article yet. If you can help us, then please click "More info".
If you are fluent in Italian, then please help us - just point to any untranslated element (highlighted with a yellow left border - remember that images should have their titles translated as well!) inside the article and click the translation button to get started. Or have a look at the current translation status for the Italian language.
If you see a translation that you think looks wrong, then please consult the original article to make sure and then use the vote button to let us know about it.
Please help us by translating the following metadata for the article/chapter, if they are not already translated.
If you are not satisfied with the translation of a specific metadata item, you may vote it down - when it reaches a certain negative threshold, it will be removed. Please only submit an altered translation of a metadata item if you have good reasons to do so!
Introduction to AJAX
Using AJAX can be a bit cumbersome, because the various browsers have different implementations to support AJAX. Normally this would force you to write code to respond differently, depending on the browser, but fortunately, jQuery has done this for us, which allows us to write AJAX functionality with as little as a single line of code.
You should be aware of the fact that thre are both advantages and disadvantages to using AJAX on your page though, which means that you should always consider carefully before deciding to use it instead of doing a regular postback to the server. Here's a summary:
- Your page will be more pleasant to use, when you can update parts of it without a refresh, which causes the browser to flicker and the statusbar to run.
- Because you only load the data you need to update the page, instead of refreshing the entire page, you save bandwidth.
- For the same reason, a specific state can't be bookmarked by the user.
- Data loaded through AJAX won't be indexed by any of the major search engines.
The first two items on the list may be circumvented though, typically through the use of an iframe and reading and writing data from the part of the URL after the # character.
In the following chapters, you will learn how to use various AJAX related functions of jQuery.