Hidden Field Value_Changed Event Not Firing

the ValueHiddenField_ValueChanged event is not firing
please help me how to trigger my value changed event so that Message.Text that is "The value of the HiddenField control is " + ValueHiddenField.Value
is displayed in my web page

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 <script runat="server">

void ValueHiddenField_ValueChanged (Object sender, EventArgs e)

  {
 
    // Display the value of the HiddenField control.

    Message.Text = "The value of the HiddenField control is " + ValueHiddenField.Value + ".";
 
  }

</script>
 
<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>Untitled Page</title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

     <h3>HiddenField Example</h3>
 
            Please enter a value and click the submit button.<br/>
 
            <asp:Textbox id="ValueTextBox"

              runat="server"/>
 
            <br/>  
 
            <input type="submit" name="SubmitButton"

             value="Submit"

             onclick="PageLoad()" />
 
            <br/>
 
            <asp:label id="Message" runat="server"/>&nbsp;
 
    </div>
 
            <asp:hiddenfield id="ValueHiddenField"

              onvaluechanged="ValueHiddenField_ValueChanged"

              value="" 

              runat="server"/>

    </form>

</body>

</html>
 
<script type="text/javascript">

  <!--

  function PageLoad()

  {

    // Set the value of the HiddenField control with the

    // value from the TextBox.

    Form1.ValueHiddenField.value = Form1.ValueTextBox.value;
 
  }

  -->

</script>

Aug 22 '08 #1

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4367

cloud255

427

Expert 256MB

Well, according to the MSDN, the event is only raised if the value changes between postbacks...

Aug 22 '08 #2

Plater

7,872

Expert 4TB

Yes, the events only occur durring a postback.
Also, if it's a hidden field, how is it being changed?

Aug 22 '08 #3

femina

so if the Value_Changed event triggers between post backs
lets assume textbox value is "femina" for the first time i click a button and if i change my text box value the next time say "fayaz" and then i click my button.
Now will the Value_Changed event be triggered since i have assigned my hiddenfield value with the textbox value each time before submitting the button

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void ValueHiddenField_ValueChanged (Object sender, EventArgs e)

  {
 
    // Display the value of the HiddenField control.

   Label1.Text += "The value of the HiddenField control is " + HiddenField1.Value + ".";

  }

so will the label text be modified in the web page
please clear my doubts

Aug 25 '08 #4

Plater

7,872

Expert 4TB

Changing the value in code behind would not trigger the Value_changed event. However, since you're already IN the code at that point, why not just call the function from code anyway?

Aug 25 '08 #5

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Hidden Field Value_Changed Event Not Firing

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