update a form and not load or reload page

I have a simple command:

<?php echo form_open("sales/add",array('id'=>'add_item_form')); ?>

How can I make this command so it just updates 开发者_开发百科the form, without reload or redirection. I dont even need to see the form. I have tried all sorts of methods, but wondering if there is something simple here I am missing. I just need to post the data. This is what is outputted by codeigniter.

<form action="http://127.0.0.1/index.php/sales/add" method="post" id="add_item_form">
    <label id="item_label" for="item">
</form>

I have tried jquery but still does not work. Any help would be greatly appreciated.

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You could use iframes or xml http requests (ajax)

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You absolutely need jquery ajax function to do that. Maybe you have tried different jquery function. Check this out:

http://api.jquery.com/jQuery.post/

There are some examples in that link you can look at.

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Do you know the path of your controller? Then you can use jQuery to do that. Check this plugin: http://jquery.malsup.com/form/