Check if the text box "text" has changed (RePost from web forms forum)


How can i know if the "text" inside of a text box has changed?

For example, I currently have this:

if (txtMU.TextChanged())



But this does not work. The other idea I had was to assign the existing value of the text box to a string and then when the user click the save button I can create a conditional statement to compare the original string with the new string. However, I would like something more effective as I have like 12 text boxes to compare.




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7/8/2008 3:17:43 PM 24353 articles. 2 followers. Follow

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Here is the easiest way that I have found.

<form id="form1" runat="server">
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
 <input type="button" onclick="onButtonClick();" value="Compare" />

<script type="text/javascript">
function onButtonClick(elementRef)
 var textBoxRef = document.getElementById('<%= TextBox1.ClientID %>');

 //alert('originalText: ' + textBoxRef.originalText + ' New text: ' + textBoxRef.value);
 if ( textBoxRef.originalText != textBoxRef.value )
  alert('The text in TextBox1 has been changed');
// -->

protected void Page_Load(object sender, EventArgs e)
    if ( this.IsPostBack )
  //this.Response.Write("originalText: " + TextBox1.Attributes["originalText"] + " New text: " + TextBox1.Text + "<br>");

 TextBox1.Attributes.Add("originalText", TextBox1.Text);


7/8/2008 4:09:30 PM

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