How to integrate ajax to WordPress theme?

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I am trying to use ajax in wordpress

I have two files, php and js

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this is my php code
combo_check-out.php 

function iRange($first, $last, $format = 'm/d/Y' ) { 
        $dates = array();
        $current = strtotime($first);
        $i=1;
        while( $i <= $last ) { 
            $dates[] = date($format, $current);
            $current = strtotime('+1 day', $current);
            $i++;
        }

        $time = date("m/d/Y",$current);
        return $time;
    }

if($_REQUEST)
{
    $id     = $_REQUEST['parent_id'];
    ?>


    <select name="check-out"  id="check-out-date">
        <option value="<?php echo iRange($id, 1, $format = 'm/d/Y' ) ?>">"1 Day (Same Day)"</option>
        <option value="<?php echo iRange($id, 2, $format = 'm/d/Y' ) ?>">"2 Days"</option>
        <option value="<?php echo iRange($id, 3, $format = 'm/d/Y' ) ?>">"3 Days"</option>
        <option value="<?php echo iRange($id, 4, $format = 'm/d/Y' ) ?>">"4 Days"</option>
    </select>   

<?php}?>

and here it is my js code
combo_checkout_iRange.js 

$(document).ready(function() {
    $('#loader').hide();
    $('#check-in-date').change(function(){
        $('#check-out-date-wrap').fadeOut();
        $('#loader').show();
        $.post("combo_check-out.php", {
            parent_id: $('#check-in-date').val(),
        }, function(response){
            setTimeout("finishAjax('check-out-date-wrap', '"+escape(response)+"')", 400);
        });
        return false;
    });
});

//JQuery to hide Loader and return restults
function finishAjax(id, response){
  $('#loader').hide();
  $('#'+id).html(unescape(response));
  $('#'+id).fadeIn();
} 

function alert_id()
{
    if($('#check-out-date').val() == '')
    alert('Please select a sub category.');
    else
    alert($("#check-out-date").val());
    return false;
}

they work fine outside wordpress

how to integrate them in wordpress theme

Note: this should work in post type called “meetings”
so this is what i wrote on function.php 

add_action("wp_enqueue_scripts", function() {

     if (is_single()) {
        if (get_post_type() == 'meetings')
        {
            wp_enqueue_script('combo_checkout_iRange', get_template_directory_uri() . '/js/combo_checkout_iRange.js', array( 'jquery' ), '1.0' ,true);

        }
    }
});
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1 comment

  1. First step

    the url you need to hit that is : 

    <?php echo admin_url( 'admin-ajax.php' ); ?>

    now there are couple of method to get this into the js . that is your “ajaxurl”

    Second Step

    with the url , you need to pass a action like :

    url?action=your_ajax_hit

    in jquery , it would be like : 

    $.ajax({
 url : ajaxurl+'?action=your_ajax_hit',
 type : 'post'
.....
.....
.....
});

    Third Step

    into the functions.php you can add 

    add_action("wp_ajax_your_ajax_hit", "your_function_name");
add_action("wp_ajax_nopriv_your_ajax_hit", "your_function_name");

function your_function_name(){

   // your code 

  wp_die();
}

    you can see its

    wp_ajax_ your_ajax_hit

    thats it

    please read this : http://codex.wordpress.org/AJAX_in_Plugins