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Thread: Ajax doesn't work sometimes

  1. #1
    Join Date
    Jun 2010
    Posts
    8

    Ajax doesn't work sometimes

    I use the following code :

    function createXHR() {
    var request = false;
    try {
    request = new ActiveXObject('Msxml2.XMLHTTP');
    }
    catch (err2) {
    try {
    request = new ActiveXObject('Microsoft.XMLHTTP');
    }
    catch (err3) {
    try {
    request = new XMLHttpRequest();
    }
    catch (err1) {
    request = false;
    }
    }
    }
    return request;
    }

    function sendRequest() {
    var validate=document.getElementById('validate').value;
    querystring = 'validate=' + validate;
    xhr.open('POST', 'validate.php', true);
    xhr.onreadystatechange = sayHello;
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    xhr.send(querystring);
    }


    function sayHello() {
    if (xhr.readyState == 4) {
    //return answer
    }
    }

    xhr = createXHR();


    this code sometimes works and sometimes doesn't work.
    how we can sure that above code works?

  2. #2
    Join Date
    Jun 2007
    Posts
    667
    You probably need to make sure that the query is always unique. Perhaps:

    Code:
    querystring = 'validate=' + validate+ "&rand=" + new Date().getTime();

  3. #3
    Join Date
    Aug 2007
    Posts
    3,767
    Doesn't work on what end? The server or the client? I think Sterling's is a good guess, it's probably being cached, but you should try to give us as much information as possible so we can do more than guess.

  4. #4
    Join Date
    Jun 2010
    Posts
    8

    Thank

    Hi
    Thank you for your contribution.
    The problem was solved Most often, but sometimes (below 1% of times) the problem still exists. Nevertheless, Thank you.

  5. #5
    Join Date
    Jul 2009
    Posts
    73
    How where you able to solve this issue. i run into the say problem with IE 8. my code will work in every other browser but IE 8. I believe the request is stopping at "reqObj.open("GET",url, true); from the debugging report.

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