Question

$delete_commant = l(t(‘X’), $url, array(‘attributes’ =>
array(‘onclick’ => ‘return call_ajax(123)’)));

when i put alert in call_ajax function definition, it is alerted, so i proceed to write the ajax post method, but when i click the link page getting refresh,

How to implement ajax in drupal

function call_ajax(str){alert(str);
    var url = "post.php";
    var params = "lorem=ipsum&name=binny";
    http.open("POST", url, true);

    //Send the proper header information along with the request
    http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    http.setRequestHeader("Content-length", params.length);
    http.setRequestHeader("Connection", "close");

    http.onreadystatechange = function() {//Call a function when the state changes.
        if(http.readyState == 4 && http.status == 200) {
            alert(http.responseText);
        }
    }
    http.send(params);  
     }

Answer 1

drupal uses jquery by default. So why not just implement this call using http://api.jquery.com/jQuery.ajax/.

Other techniques involve using the form_api like the ahah : http://api.drupal.org/api/drupal/developer–topics–forms_api_reference.html/6#ahah