Pass arguments into ajax onreadystatechange callback?

Question

What\'s the normal pure javascript (i.e. not JQuery) way to pass arguments into an anonymous onreadystatechange callback?

For example:

function doReq         


        

Answer 1

Never too late! :-)

Instead of passing data using arguments in xhttp.onreadystatechange which is somewhat complicated, one can just add properties to the xhr object itself.

For instance:

var m = "Hello!";
var xhttp = new XMLHttpRequest();
xhttp.m = m;
xhttp.onreadystatechange = function()
{
    var x, m;
    x = this;
    m = x.m;
    if ((x.readyState == 4) && (x.status == 200))
    {
        alert(m);
    }
};
// ...