Jquery & Codeigniter ajax cache: false

Jquery & Codeigniter ajax cache: false - Printable Version

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+--- Thread: Jquery & Codeigniter ajax cache: false (/showthread.php?tid=30712)

Jquery & Codeigniter ajax cache: false - El Forum - 05-24-2010

[eluser]mjsilva[/eluser]
Hi there,

TIL that Internet Explorer caches every ajax call, even if you do something like this:

Code:
$this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', time()).' GMT');

$this->output->set_header('Expires: '.gmdate('D, d M Y H:i:s', time()).' GMT');

$this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0");

$this->output->set_header("Pragma: no-cache");

In Jquery you can specify this:

Code:
$.ajaxSetup({

    cache: false

});

This is a smart thing, what it do is putting a timestamp in your request, so let's say you have this function:

Code:
$("#checkout").click(function(){

    var self = $(this);

    $.get(base_url+'ajax_fnc/is_logged_in/', function(data){

        alert(data);

        if(!data)

        {

            $("#login_btn").click();

            $('html, body').animate({scrollTop:0}, 'normal');

        }

        else

        {

            [removed] = self.attr('href');

        }

    });

    return false;

});

Your request becomes:

http://my_site.com/ajax_fnc/is_logged_in/?_=1274699621534

But codeigniter doesn't appears to like this type of URLs, I've already make this changes in config.php:

Code:
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-&=';

$config['enable_query_strings'] = TRUE;

but I'm still getting 404 errors.

Any hint on how to prevent Internet Explorer to cache this type of ajax calls?
Or how to make CI to like this URL?

tks

Jquery & Codeigniter ajax cache: false - El Forum - 05-24-2010

[eluser]zoko2902[/eluser]
you can try using the post method, since it's not supposed to be cached.

Jquery & Codeigniter ajax cache: false - El Forum - 05-24-2010

[eluser]mjsilva[/eluser]
Yes, I ended doing that.

But it's one of those things, that I would like to know why it happens, like magnets Smile

Jquery & Codeigniter ajax cache: false - El Forum - 05-24-2010

[eluser]zoko2902[/eluser]
I know what you mean Big Grin

.

I was banging my head with this IE "feature" couple of months ago. It was explained rather clearly in this post.