how to bound a textbox value with a label in asp.net

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how to bound a TextBox value with a label in asp.net, SO that whatever be typed in the TextBox it reflects the same in same time in the label.

Posted 7-Jul-13 20:56pm

kool15th

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4 solutions

Solution 1

You can use the TextBox TextChanged Event to do that.. Text Entered in Textbox will be displayed in Label after hitting enter

C#

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
    Label1.Text = TextBox1.Text;
}

Hope that gona help...

Posted 7-Jul-13 21:03pm

VICK

Comments

kool15th 8-Jul-13 6:17am

Thanks...But it will only happen when the complete entry have been made in the textbox. I want every instant update.

VICK 8-Jul-13 6:40am

Than You can use JavaScript for that...

Solution 3

JavaScript

<script>
        function WriteText()
        {
            var TextBox1= document.getElementById('TextBox1');
            var Label1= document.getElementById('Label1');
            Label1.innerText=TextBox1.value;
        }
    </script>

use this WriteText function on onkeyup="WriteText();" of textbox

like this

XML

<asp:textbox id="TextBox1" onkeyup="WriteText();" runat="server" xmlns:asp="#unknown"></asp:textbox>

Posted 9-Jul-13 0:37am

Neeraj Pandya

Updated 9-Jul-13 1:05am

v2

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Raju Bollam · Accepted Answer · 2013-07-07T21:17:00

u can use javascript

XML

<script type="text/javascript">
function CalculateBMI() {
            var Weight = parseFloat(document.getElementById('<%=txtWeigh %>').value);
            var Height = parseFloat(document.getElementById('<%=txtHeight %>').value);
            if (!isNaN(Weight) && !isNaN(Height)) {
                var Ms = parseFloat((Height) / 100);
                document.getElementById('<%lblBmi%>').value = parseFloat((Weight) / (Ms * Ms));
                return false;
            }
            else {
                document.getElementById('<%lblBmi%%>').value = "";
                return false;
            }
        }
 </script>;

these are ur textboxes to call javascript method

ASP.NET

<asp:TextBox ID="txtWeight" runat="server"
                onkeyup="CheckFirstChar1(this);CalculateBMI();"
                ></asp:TextBox>

 <asp:TextBox ID="txtHeight" runat="server"
                onkeyup="CheckFirstChar1(this);CalculateBMI();"
                ></asp:TextBox>

Accept as answer if solve you problem.

Raju Bollam · Accepted Answer · 2013-07-09T00:56:00

actually txtHeight is not closed if u Observe above code u can find out.
that is the Mistake

so pls change as like </asp:TextBox> and remove this CheckFirstChar1(this) method

copy this code

XML

<asp:TextBox ID="txtWeight" runat="server"
                onkeyup="CalculateBMI();"
                ></asp:TextBox>

 <asp:TextBox ID="txtHeight" runat="server"
                onkeyup="CalculateBMI();"
                ></asp:TextBox>