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Thread: Error on __doPostBack, Object doesn't support property or method 'replace'

  1. #1
    Join Date
    Dec 2011

    Error on __doPostBack, Object doesn't support property or method 'replace'

    My goal is to trigger CheckedChanged event on server side with javascript

    this is the function:
    <script language="javascript" type="text/javascript">
    function confirmation(checkbox) {
    if (checkbox.checked == true) {
    var answer = confirm('Really confirm ');

    if (answer) {
    __doPostBack(checkbox, '');
    return true;
    else {
    checkbox.checked = false; return false;

    when I get to __doPostBack(checkbox, ''); I get error in the title.
    I'm using script manager in asp and when I remove it, all works well, but I need script manager for ajax.

    In debug :

    _uniqueIDToClientID: function PageRequestManager$_uniqueIDToClientID(uniqueID) {
    ->> return uniqueID.replace(/\$/g, '_'); here error is thrown

    Any advice thx.

  2. #2
    Join Date
    Dec 2003
    Bucharest, ROMANIA
    What kind of variable is the passed argument checkbox here?:
    function confirmation(checkbox)
    Should be a DOMElement (an object) by all means. Not a string (that means not the value of a name or id attribute)

  3. #3
    Join Date
    Dec 2011

    I'm using this function which is triggerd on checkbox click. This is just for test to use an object. Same thing happens, same error

    function TestCheckBox() {

    var Inputs = TargetBaseControl.getElementsByTagName("input");

    for (var n = 0; n < Inputs.length; ++n) {
    if (Inputs[n].type == 'checkbox' &&
    Inputs[n].id == 'ContentPlaceHolder1_gridviewJobs_cbChecks_2') {

    return true;

    return false;

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