如何在不手动调用 javascript 中的 function 的情况下使用 ajax 自动刷新页面的一部分？

Question

var xmlhttp;

//Set up ajax first so he knows which guy to play with
function loadXMLDoc(url,cfunc)
{
    //Code to catch modern browsers
    if (window.XMLHttpRequest)
    {
        xmlhttp=new XMLHttpRequest();
    }

    //Code to catch crap browsers
    else
    {
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }

    //Set up
    xmlhttp.onreadystatechange=cfunc;
    xmlhttp.open("GET",url,true);
    xmlhttp.send();
}

//Set a function to deploy when something calls myFunction()
function myFunction()
{
    loadXMLDoc("../../../support/ajaxTest.txt",function()
    {
        //Fires off when button pressed
        if (xmlhttp.readyState==4 && xmlhttp.status==200)
        {
            document.getElementById("statusRefresh").innerHTML=xmlhttp.responseText;
            setInterval( "alert('Hello I did something but i needed to be invoked by a button first')", 5000 );  
        }

    });
}

I want to call restful java service to refresh a 'status'. I need ajax to auto refresh the this status once the page has been hit. The Refresh method isnt instantaneous, for it has to talk with other machines.

Answer 1

function autoRefresh()
{
    var url    = "../../../support/ajaxTest.txt";
    var target = document.getElementById("statusRefresh");

    var doRefresh = function() 
    {
        loadXMLDoc(url, function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                target.innerHTML=xmlhttp.responseText;
            }
        }
    });

    setInterval( doRefresh, 5000 );  
} 

and

document.onload = autoRefresh;

Answer 2

more information is needed such as what is your goal, what do you currently have......what are you trying to do......If its a script thats triggered by something from example a user viewing your page or click a button then use that button to triiger the function to auto refresh

Another way is to use a crob job