How to make character counter for textbox multiline

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In my ongoing project I am held up at a multiline textbox where I have fixed the character length to 400. I want the length to reduce when any keyboard character entered and the length increases when any character deleted. The counter shall be displayed in a label. Can any one help?

Posted 20-Dec-12 21:50pm

S.Rajendran from Coimbatore

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Member 10510822 · Answer 1 · 2012-12-20T22:07:00

Hello, yes you can do this with javascript. please follow the sample code:

XML

<form id="form1" runat="server">
    <script type="text/javascript">
        function CountChar(idTxtBox) {


            document.getElementById('lblCountChar').innerHTML = document.getElementById(idTxtBox).value.length;
        }
    </script>
    <asp:TextBox ID="txtDetails" Width="200" runat="server" TextMode="MultiLine" onkeyup="CountChar(this.id);" />
    <asp:Label ID="lblCountChar" Text="" runat="server" />

    </form>

CPallini · Answer 2 · 2012-12-20T22:12:00

Solution 2

You may add a handler for the TextChanged event, this way:

C#

private void myTextBox_TextChanged(object sender, EventArgs e)
{
  int remain = 400 - myTextBox.Text.Length;
  myLabel.Text = remain.ToString();
}

Posted 20-Dec-12 22:12pm

CPallini

Sampath Kumar Sathiya · Answer 3 · 2012-12-20T22:44:00

Hi,

Use the following,

XML

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
 <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script language="javascript" type="text/javascript">
        function stringCounter(textBox, countlabel, maxlength) {
            countlabel.value = maxlength - textBox.value.length;
        }
    </script>
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

   <asp:TextBox ID="TextBox1" runat="server" Height="100" Width="550" Wrap="true"
           TextMode="MultiLine" MaxLength="500" onkeyup="stringCounter(MainContent_TextBox1, MainContent_label1, 500);"
           onkeydown="stringCounter(MainContent_TextBox1, MainContent_label1, 500);" />
&nbsp;&nbsp;
   <asp:TextBox ID="label1" runat="server" ReadOnly="true" BorderStyle="None"></asp:TextBox>
</asp:Content>

How to make character counter for textbox multiline

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