Getting JSON callback function to fire when page loads
I am generating some JSON using php function json_encode. This is all fine but when I call this page and try and put the callback function in the src URL the callback function does not fire when page has loaded?
I have read a few articles and it looks like I actually need to set up a kind of JSON webservice or something.
Can anyone give me some pointers or advice on how to get this to work?
pr0gr4mm3r posted this at 22:30 — 18th February 2010.
He has: 1,502 posts
Joined: Sep 2006
It's not really a web service. It's just a PHP script that returns JSON instead of HTML.
All you need to do is do an AJAX postback and process the returned JSON. This is the best AJAX example w/o using a framework like jQuery:
http://www.w3schools.com/PHP/php_ajax_database.asp
benf posted this at 12:24 — 19th February 2010.
They have: 426 posts
Joined: Feb 2005
This is not exactly what I mean: Basically, if I have a normal HTML webpage with a script tag in the head or body:
<script src="http://php-page-that-generates-JSON/?param=1&callback=callbackfunction"></script>then I create a function with the same name as the callback parametre ("function callbackfunction()") then this function automatically gets fired once the page has loaded.
EDIT: actually it does work I just need to define the function before including the json file!
If you look at the Yahoo webservice, this is what it does:
http://developer.yahoo.com/common/json.html#callbackparam
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