Hidden Field Value_Changed Event Not Firing

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  • femina
    New Member
    • Dec 2007
    • 35
    #1

    Hidden Field Value_Changed Event Not Firing

    the ValueHiddenFiel d_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 " + ValueHiddenFiel d.Value
    is displayed in my web page

    Code:
    <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>
    Last edited by femina; Aug 22 '08, 01:35 PM. Reason: proper title
    Tags: None
    • cloud255
      Recognized Expert Contributor
      • Jun 2008
      • 427
      #2
      Well, according to the MSDN, the event is only raised if the value changes between postbacks...

        Comment

        • Plater
          Recognized Expert Expert
          • Apr 2007
          • 7872
          #3
          Yes, the events only occur durring a postback.
          Also, if it's a hidden field, how is it being changed?

            Comment

            • femina
              New Member
              • Dec 2007
              • 35
              #4
              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
              Code:
              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

                Comment

                • Plater
                  Recognized Expert Expert
                  • Apr 2007
                  • 7872
                  #5
                  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?

                    Comment

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