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§ Don't AJAX an image!

Using AJAX is fine when you need it, but I've used AJAX to simply reload CAPTCHA images.  Boy, some people are dumb!  Me, in particular.

UPDATE:  I'm dumber than I thought...

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§ Simple AJAX request

Almost all of my AJAXing is to simply grab the output of a source and stuff it in in a div.  In previous posts you can see what I've been using for a long time, but I wanted to make a function I wouldn't have to edit every time I used it in a project.

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§ Use iframe contents to change iframe to ajax div

This php file, used as an iframe's content, will attempt to load javascript to the parent to replace the iframe with a div, then ajax its content to that div.

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I don’t hold myself out as a role model generally, but I think the world might be better off if more people accepted responsibility and dealt with consequences.
David Drake, Author's Note to In the Stormy Red Sky