AJAX for noobie

Hey,

I bit the bullet and needed to use ajax to check if a page exists, as I am writing a link manager for someone.

[code=php]

var fail = false;
var http_request = false;
var url = document.getElementsByName(‘txtURL’)[0].value;

function check_link(){

//AJAX it!
if (window.XMLHttpRequest){
http_request = new XMLHttpRequest(); //set the request
http_request.onreadystatechange = is_valid_url; //function to call on each set
http_request.open(“GET”, url, true); //set the page to request
http_request.send(null); //initialize the request
}
//ActiveX – can we say IE?
else if(window.ActiveXObject){
//Create our RequestObject
http_request = new ActiveXObject(“Microsoft.XMLHTTP”);
if(http_request){
http_request.onreadystatechange = is_valid_url //function to call on each step
http_request.open(“GET”, url, false); //set the page to request
http_request.send(null); //initialize the request
}
}

if(fail){
alert(‘failed’);
return false;
}else{
alert(‘passed’);
return true;
}
}

function is_valid_url(){
if (http_request.readyState == 4){
if(http_request.status != 200)
fail = true;
else
fail = false;

return;
}
}

[/code]

ok, that is the basis of my code.

If I check readyState, I get on error of ‘Access Denied’ on the line that sets the function to the onreadystatechange.

If I remove the check for readyState, I get an ‘Unspecified Error’ in the is_valid_url function when it tries to check http_request.status.

Any help appreciated,

CM!

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