在ajax中使用参数调用onreadystatechange回调函数

Question

I found a question on this in SOF ..but didnt find the solution..

this is my code..

 if (mefofftasksxmlhttp!=null)
        {
            mefofftasksxmlhttp.onreadystatechange=sasi_ready(taskId);
            mefofftasksxmlhttp.open("GET",url,true);
            mefofftasksxmlhttp.send(null);
        }

callback function

function sasi_ready(tskId)
        {
            if (mefofftasksxmlhttp.readyState==4)
            {
               if (mefofftasksxmlhttp.status==200)
                {
                    alert('Task Moved to completed Tasks');
                    $('#'+tskId).hide();
                }
                else
                {
                    alert("Problem retrieving XML data");
                }
            }
        }

this code is doesnt allowing me into the callback when i pass a parameter in the callback function ..but when i remove parameter..thats working fine..

where i went wrong?

Answer 1

As @Beetroot-Beetroot already said: You need to pass a function reference to onreadystatechange. If you want to pass a parameter, you could still call a function with this parameter as long as this function will return a function reference

function sasi_ready(tskId) {
   return function() {
        if (mefofftasksxmlhttp.readyState==4)
        {
           if (mefofftasksxmlhttp.status==200)
            {
                alert('Task Moved to completed Tasks');
                $('#'+tskId).hide();
            }
            else
            {
                alert("Problem retrieving XML data");
            }
        }
   }
}