Putting label value into textboxe

Question

1.00/5 (1 vote)

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XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type = "text/javascript">
        function labelToText(lblConversionFactor, txtConversionFactor) {
            document.getElementById(txtConversionFactor).value =
                document.getElementById(lblConversionFactor).innerHTML;
        }
        document.getElementById("L2T").addEventListener("click", function () {
            labelToText( "Txt","Lbl");
        });
        </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
        <asp:TextBox ID="Txt" runat="server"></asp:TextBox>
    </div>

    </form>
</body>
</html>

I have tried using

C#

protected void Txt_TextChanged1(object sender, EventArgs e)
    {
        Lbl.Text = Txt.Text;
    }

But this was also not working

Posted 3-Mar-15 22:26pm

Member 11111143

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Comments

KaushalJB 4-Mar-15 4:32am

Unclear !! Unclear !! Unclear !!

Member 11111143 4-Mar-15 4:40am

No there is no error but it is not showing me the label value into textbox

Member 11111143 4-Mar-15 5:58am

why the label value is not shown in the the textbox is there any javascript error

[no name] 4-Mar-15 4:34am

Do u got any error? put a break point and try again.

Member 11111143 4-Mar-15 4:39am

No there is no error but it is not showing me the label value into textbox

3 solutions

Solution 3

You have written many events in JavaScript as well as in Server side. But nothing is invoking these events.

JavaScript

document.getElementById("L2T")

There is no such element with ID "L2T".

Txt_TextChanged1 is not defined in the markup, so how it will invoke the event? Nothing work automatically, you have to tell them to do.

Posted 3-Mar-15 23:58pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

Member 11111143 4-Mar-15 7:35am

What Shall I Do I am not understanding such a simple thing. The Java script is not working also.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Mar-15 8:15am

So, tell me first. What exactly you need to do? On which event you want to fill the textbox?

Member 11111143 4-Mar-15 8:22am

when the user Logs in the user name is shown in the label username, I want that username(label) to copy it in a textbox(username)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Mar-15 8:32am

That means you want to put that as a placeholder. No need to do all these stuff.

See - HTML input placeholder Attribute. This will work with all modern browsers.

If you want to support old browsers, then you can do like it is shown - here by implementing a onfocus event.

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Peter Leow · Accepted Answer · 2015-03-03T23:55:00

Definitely, there are errors:
1. Where is no "L2T", you are attaching a click event listener to it and it is no where to be found. I assume it is a button.
2. The addEventListener was declared before the L2T was created as it is placed before the loading of supposedly a L2T in the body.
3. Do not use static id in asp.net as the run time id could be different, refer: ASP.NET 4.0 Client ID Feature[^]
Let's see the correct version:

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>

</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
        <asp:TextBox ID="Txt" runat="server"></asp:TextBox>
        <asp:Button ID="L2T" runat="server" Text="Button" />
    </div>

    </form>
        <script type = "text/javascript">
            function labelToText(lblConversionFactor, txtConversionFactor) {
                document.getElementById(txtConversionFactor).value =
                    document.getElementById(lblConversionFactor).innerHTML;
            }
            document.getElementById("L2T").addEventListener("click", function () {
                labelToText("<%= Lbl.ClientID  %>", "<%= Txt.ClientID  %>");
            });
        </script>
</body>
</html>

++++++++++[Round 2}+++++++++++++++

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
 
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label ID="Lbl" runat="server" Text="UserName"></asp:Label>
        <asp:TextBox ID="Txt" runat="server"></asp:TextBox>
    </div>
 
    </form>
        <script type = "text/javascript">
            function labelToText(lblConversionFactor, txtConversionFactor) {
                document.getElementById(txtConversionFactor).value =
                    document.getElementById(lblConversionFactor).innerHTML;
            }
                
            labelToText("<%= Lbl.ClientID  %>", "<%= Txt.ClientID  %>");

        </script>
</body>
</html>

Suvendu Shekhar Giri · Accepted Answer · 2015-03-03T23:55:00

Solution 1

You have missed to make few changes.
Replace this-

ASP.NET

<asp:textbox id="Txt" runat="server" ></asp:textbox>

with

ASP.NET

<asp:textbox id="Txt" runat="server" autopostback="True" ontextchanged="Txt_TextChanged1" ></asp:textbox>

Hope, it helps :)

Posted 3-Mar-15 23:55pm

Suvendu Shekhar Giri

v2