ajax json javascript

So in trying to have javascript pass values to a php script using Ajax i get the following error message.

Uncaught SyntaxError: Unexpected end of input

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  • In stepping through the code I found saw that my response from my script came back a null string. Would someone please point me to my mistake, I cannot seem to get a grasp on it.

    Here is my javascript (request.js)

    var request;
    function getHTTPObject()
        var xhr = false;
        if (window.XMLHttpRequest)
            xhr = new XMLHttpRequest();
        } else if (window.ActiveXObject) {
                xhr = new ActiveXObject("Msxml2.XMLHTTP");
                    xhr = new ActiveXObject("Microsoft.XMLHTTP");
                    xhr = false;
        return xhr;
    function runAjax(JSONstring)
        // function returns "AJAX" object, depending on web browser
        // this is not native JS function!
        request = getHTTPObject();
        request.onreadystatechange = sendData;
        request.open("GET", "request.php?json="+JSONstring, true);
    // function is executed when var request state changes
    function sendData()
        // if request object received response
        if(request.readyState == 4)
        // parser.php response
        var JSONtext = request.responseText;
        // convert received string to JavaScript object
        var JSONobject = JSON.parse(JSONtext);
        // notice how variables are used
        var msg = "Number of errors: "+JSONobject.errorsNum+
            "\n- "+JSONobject.error[0]+
            "\n- "+JSONobject.error[1];

    my php file.

    $decoded = json_decode($_GET['json']);
    $json = array(
        'errorsNum'    =>    2,
        'error'       =>    array(
                            "error 1","error 2!"
    $encoded = json_encode($json);

    and finally my html file where I invoke ajax.

    <script src="request.js">
    <a href="Javascript:runAjax('vinoth')">call</a><br>

    Thanks in advance.

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