Calling a VB.NET function (code behind) from a JavaScript function.

I have a popup window, which returns some values to a javascript function in the parent calling web page.
My JScript function is:

Code:

---

function SelectedVisitors(VisitorKeys)
{
    alert(VisitorKeys)
}

---

Where visitorkeys is like "34,6,234,1"

Basically I need to call a vb.net function is code behind to save these values to the DB, and then refresh the grid on that page too.

Woka

perhaps copying the data to a hidden control and raising a postback would work
http://weblogs.asp.net/mnolton/archi...6/04/8260.aspx

Quote:

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Originally Posted by EricDalnas

perhaps copying the data to a hidden control and raising a postback would work
http://weblogs.asp.net/mnolton/archi...6/04/8260.aspx

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That's just what I was about to suggest. :)

Cheers for the replies.
Right...OK. Bit of a cheap hack/frig don't you think?
How about...
Code to create JS:

VB Code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
                 doPostBack(Me)
             End Sub
 
    Private Sub doPostBack(ByVal oPage As Page)
 
        If oPage.IsClientScriptBlockRegistered("__doPostBack") Then Return
 
        oPage.RegisterClientScriptBlock("__doPostBack", GetPostBackScript)
 
        oPage.RegisterHiddenField("__EVENTTARGET", "")
        oPage.RegisterHiddenField("__EVENTARGUMENT", "")
 
    End Sub
 
    Private Function GetPostBackScript() As String
 
        Dim Java As New StringBuilder(1024)
 
        With Java
            .Append("function __doPostBack(eventTarget, eventArgument)          " + nl)
            .Append("{                                                          " + nl)
            .Append("   var theform;                                            " + nl)
            .Append("                                                           " + nl)
            .Append("   if (window.navigator.appName.toLowerCase().indexOf('microsoft') > -1)   " + nl)
            .Append("   {                                                       " + nl)
            .Append("       theform = document.Form1;                           " + nl)
            .Append("   }                                                       " + nl)
            .Append("   else                                                    " + nl)
            .Append("   {                                                       " + nl)
            .Append("       theform = document.forms['Form1'];                  " + nl)
            .Append("   }                                                       " + nl)
            .Append("                                                           " + nl)
            .Append("   theform.__EVENTTARGET.value = eventTarget.split('$').join(':');         " + nl)
            .Append("   theform.__EVENTARGUMENT.value = eventArgument;theform.submit();         " + nl)
        End With
 
        Return Java.ToString
 
    End Function

Now you need a hidden control in your page to handle the postback and store some data:

Code:

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<input type="hidden" id="VisitorKeys" value="" runat=server NAME="VisitorKeys">

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And now the JS function that is called from a button click event or something:

Code:

---

function SelectedVisitors(VisitorKeyValues)
{
        document.forms[0].VisitorKeys.value=VisitorKeyValues
        __doPostBack(document.forms[0].VisitorKeys.value, '')
}

---

We now need a function in the code behind to handle this postback.
because we are using a hidden input control we can use an event of this:

VB Code:

Private Sub VisitorKeys_ServerChange(ByVal sender As Object, ByVal e As System.EventArgs) Handles VisitorKeys.ServerChange
        Dim Keys As String = VisitorKeys.Value
        'Handle code here
    End Sub

make sense?

Woka