How to pass value from parent asp.net dropdownlist to textbox in popup using javascript

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Hello i am failing to pass the value from dropdownlist in the parent aspx form to textbox in the child aspx form

Parent javascript : The First script is to open the popup window

XML

   <script type="text/javascript">
    var popup;
      function NewCustOpn() {
     popup = window.open("NewCustomer.aspx","Popup",toolbar=no,scrollbars=no,location=no,statusbar=no,menubar=no,resizable=0,width=520,height=350,left = 250,top = 50");

}
  </script><pre lang="text">

This is the second script on the parent page to get the value of the dropdownlist

XML

  <script type = "text/javascript">
  function parentFunc()
  {
      return document.getElementById ("<%=DropDownList1.ClientID%>").value;
  }

</script><pre lang="text">

The child page javascript:

XML

  <script type = "text/javascript">
window.onload = function ()
{

    if(window.opener != null && !window.opener.closed)
    {
       var val = window.opener.parentFunc();
  var textbox = document.getElementById("<%=TextBox1.ClientID%>");
       textbox.Value = val;
    }
}
</script><pre lang="text">

When the popup opens TextBox1 is empty.

Posted 8-Jul-14 20:57pm

Uriel Tinashe Patsanza

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Brahmmam · Accepted Answer · 2014-07-08T21:29:00

Store ur dropdownlist selected value into one variable..
While opening Popup window send that variable as query string

open your window in code behind like below

C#

ScriptManager.RegisterClientScriptBlock(this.GetTye(), "openwindow", "<script> window.open(NewCustomer.aspx?customerId="+custID,"Popup","toolbar=no,scrollbars=no,location=no,statusbar=no,menubar=no,resizable=0,width=520,height=350,left = 250,top = 50");</script>", true);

and retrive above customerID value
by using below method

C#

function getQueryStrings() {
    //Holds key:value pairs
    var queryStringColl = null;
            
    //Get querystring from url
    var requestUrl = window.location.search.toString();

    if (requestUrl != '') {
        //window.location.search returns the part of the URL 
        //that follows the ? symbol, including the ? symbol
        requestUrl = requestUrl.substring(1);

        queryStringColl = new Array();

        //Get key:value pairs from querystring
        var kvPairs = requestUrl.split('&');

        for (var i = 0; i < kvPairs.length; i++) {
            var kvPair = kvPairs[i].split('=');
            queryStringColl[kvPair[0]] = kvPair[1];
        }
    }

    return queryStringColl;
}

above method returns query string details u can retrieve by using below code

C#

function myfunction() {
    var queryStringColl = getQueryStrings();
    alert(queryStrinColl['customerId']);
}