Codedefiner

The XMLHttpRequest object has a property named onreadystatechange that handles asynchronous loading operations.

    xmlHttp.onreadystatechange= function()
    {

    }

The readyState property tells you how the data loading is going. Here are the possible values the readyState property can take. Those are 0,1,2 and 4.

0 means uninitialized
1 means loading
2 means loaded
3 means interactive
4 means complete (i.e., all data downloaded from the back end page).

  

        xmlHttp.onreadystatechange= function()
                                { 
	                             if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	                                { 
	                                     document.getElementById('lbl1').innerHTML 
	                                                        = xmlHttp.responseText;
	                                    //alert(xmlHttp.responseText);
		                                   			                                   
	                                } 
	                                else
	                                {
	                                   document.getElementById('lbl1').innerHTML 
	                                                        = 'Sorry, try again';
	                                }
                                }
                xmlHttp.send();

  

  

Even you can pass the paramers to the backend page.

        var pars = 'name=' + name;
        xmlHttp.send(pars);