PHP+AjAx implements progress bar RadyState states_PHP tutorial

Using Ajax+php to create a progress bar is actually very simple.

readyState == status (0,1,2,3,4)

0: The request has not been initialized and open has not been called yet

1: The request has been established, but has not been sent yet, and send has not been called yet

2: The request has been sent and is being processed

3: The request is being processed, usually some data in the response can be called

4: Complete

var xmlHttp;

function create()

if(window.ActiveXObject)

{

xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");//IE browser

}

else if(window.XMLHttpRequest)

{

xmlHttp = new XMLHttpRequest();//Non-IE browsers

}

}

function Request(url)

{

xmlHttp.open("GET","for.php?id="+url,true);//true is asynchronous transmission

xmlHttp.onreadystatechange = ip985;//Response function

xmlHttp.send(null);

}

function ip985()

{

if(xmlHttp.readyState==1)

{

document.getElementById('IP985').innerHTML = "The request has been established and is ready to be sent..."; //IP985 flag

}

if(xmlHttp.readyState==4)
{
var v = xmlHttp.responseText;//Get content

document.getElementById('ip985').innerHTML = v;//Target web page content
}

}

Source: 5D Happy Blog: http://www.5DKX.com/