Suppose that I have a simple form in my page like this :
You're almost there. Intercept the submit event (as you are doing), extract the min and max values, build your url and set window.location.href
$(document).ready(function() {
$("#form_search").submit(function(event) {
event.preventDefault();
$this = $(this);
// var url = rewrite_interval_qstring();
var min_price = $('#min_price').val();
var max_price = $('#max_price').val();
var url = $this.attr('action') + '?price=' + min_price + ',' + max_price;
window.location.href = url;
});
});