Member Avatar for VinayRok

Hi friends.........
Am using a one Textarea and Text box and a Button in my application.. whenever i write a text in textbox and click on the button . textbox value is copied to Textarea... This logic i have written in Button_Click event. Now in an situation i dont want to use a button to copy textbox value to Textarea.. i want to copy the textbox value to textarea, whenever i click on the Enter Button in Keyboard. This is like GoogleChat... after writing the text in textbox , i want to Press Enter Key.. not a Button.. How to implement this..

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  • Latest Post Latest Post by kameswari

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Generated

asked for a chat-style Enter-to-send behavior (type in a textbox, press Enter, copy the text into a textarea). 's reply points toward client-side handling but mixes server-side properties with client script and uses onkeyup, which won't reliably stop a form submit. Client-side code must read DOM .value, detect the Enter key (prefer keydown), and call preventDefault() so the page does not post back.

A minimal, robust client-side pattern for a single-line input that appends the text to a textarea:

<script>
document.addEventListener('DOMContentLoaded', function() {
  var input = document.getElementById('<%= TextBox1.ClientID %>');
  var area  = document.getElementById('<%= TextArea1.ClientID %>');
  input.addEventListener('keydown', function(e) {
    var key = e.key || e.keyCode;
    if (key === 'Enter' || key === 13) {
      e.preventDefault();
      var txt = input.value.trim();
      if (!txt) return;
      area.value = area.value ? area.value + '\n' + txt : txt;
      input.value = '';
      area.scrollTop = area.scrollHeight;
    }
  });
});
</script>

For a multi-line input where Enter should send but Shift+Enter should insert a newline, switch the handler to check e.shiftKey:

<script>
var editor = document.getElementById('<%= MessageTextBox.ClientID %>');
editor.addEventListener('keydown', function(e) {
  var isEnter = (e.key === 'Enter' || e.keyCode === 13);
  if (isEnter && !e.shiftKey) {
    e.preventDefault();
    var msg = editor.value.trim();
    if (!msg) return;
    /* append to log / textarea or perform AJAX send */
    editor.value = '';
  }
});
</script>

Troubleshooting & best practices: reference control IDs with <%= Control.ClientID %> (or use ClientIDMode="Static"), place scripts after the controls or wrap in DOMContentLoaded, use e.preventDefault() to stop the browser from submitting the form, and reattach handlers after partial postbacks (UpdatePanel). Use e.keyCode === 13 as a fallback for very old browsers. This approach keeps the interaction client-side and avoids an extra server round-trip for the simple copy/send action.

Member Avatar for kameswari

hey you can use the following code.. it may help u out...

<%@ Page Language="C#" %>
<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Label1.Text = "Start";
}
TextBox1.Attributes.Add("onkeyup", "rewriteLabel()");
}
</script>

<script type="text/javascript">

function rewriteLabel(){
TextBox1.Text = Label1.text;
}

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head >
<title >test</title>
</head>
<body>
<form id="form1" runat="server">
<br />
<asp:TextBox ID="TextBox1" runat="server" /><br />
<asp:Label ID="Label1" Runat="server" BorderWidth="1px" />
</form>
</body>
</html>
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