How can I build a search filter (something like this) with WordPress?
I have a custom post type name: "Locatii". It is a custom post type with categories.
Ex: Cat 1 , Cat 2 ... and so on.
How can I implement AJAX so that when I click Cat 1 ( checkbox) and Cat 2 I should retrieve the posts that are in that categories, without having a search button.
You'll need to hook into the "onchange" event of javascript. When using jquery, it's as simple as $('<the selector string>').change(function(){});
When ever the values are changed, you'll do an AJAX request to the server with the new parameters & populate the output screen with the new result. For the server-side, you'll check the parameters, do some validations & send the response after reading the data from the database.
This codex article will help http://codex.wordpress.org/AJAX_in_Plugins
I'd suggest starting with the Query Multiple Taxonomies plugin. As far as I know it doesn't use AJAX, but you could try to extend it to add AJAX support.
