Regards
Ashutosh
On 8/17/06, Taku Sano (Mikage Sawatari) <
[EMAIL PROTECTED]> wrote:
With Ajax facilities of jQuery, it is not easy to deal with errors. In
addition, it is inconvenient to repeat reloading the same URL to
observe changes. Please confirm my patch handles these issues.
[patch for svn.208]
http://pepper.sherry.jp/jquery/newajaxpatch-svn208.patch
[test page]
http://pepper.sherry.jp/jquery/newajaxfunc.html
Problems:
- $().load() replaces the HTML regardless of whether the request has
succeeded or failed. Therefore it is impossible to customize an error
message to show.
- Callback functions can't learn if the request has succeeded or not.
- It's true that there are methods that are called on error. But even
if it failed, DOM elements are always replaced, and callbacks are
always called.
- There are no ways to set timeout. In case of a server doesn't respond,
we can't abort the request after a few seconds and display an error.
Improvements:
- Callbacks for $().load(), $.get, $.post now takes the second argument
which represents a state ("success", "failure", "notmodified").
- $().load() no longer replaces the HTML on error, if a callback is
supplied. Without a callback, it replaces the HTML on error as it
used to do.
- $().load(), $.get, $.post now can timeout. When it timed out, the state
becomes "failure" and treated as an error.
$.ajaxTimeout(1000); // ms
$().load();
- Added 2 ajax methods:
$().loadIfModified();
$.getIfModified();
These methods set If-Modified-Since header to Ajax requests. They are
useful when we periodically reload the same URL to see changes.
They work the same way as $().load and $.get if the URL is updated.
When it is unchanged, ().load doesn't replace the URL but does callback.
In that case, the state will be "notmodified".
Since IE always returns the same cached content for the same URL, it is
normally impossible to check changes. It's true that it is possible to
force not to use cache by appending some random characters as query of
the URL, but then we waste the traffic needlessly. $().loadIfModified()
and $.getIfModified() solve this problem.
----
Taku Sano
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