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Basically developers use watermark textbox to give a small hint to the user to input valid or meaningfull data. We found a lot of way to watermark a TextBox using Javascript but in this article or tutorial i will explain a very simple and easy way to implement watermark in textbox / textarea / multiline TextBox. A sample output is given below:
The main javascript method to implement watermark is:
function WaterMarkFocus(txt, text)
{
if (txt.value == text)
{
txt.value = "";
txt.style.color = "black";
}
}
function WaterMarkBlur(txt, text)
{
if (txt.value == "")
{
txt.value = text;
txt.style.color = "gray";
}
}
To implement the above sample output add an aspx page into your project then enter the below HTML markup:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Watermark_TextBox.aspx.cs" Inherits="Watermark_TextBox" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>How to Implement Watermark TextBox</title>
<script language="javascript" type="text/javascript">
function WaterMarkFocus(txt, text)
{
if (txt.value == text)
{
txt.value = "";
txt.style.color = "black";
}
}
function WaterMarkBlur(txt, text)
{
if (txt.value == "")
{
txt.value = text;
txt.style.color = "gray";
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:textbox ID="txtSearch" Text="Use ; as a separator" onfocus="WaterMarkFocus(this,'Use ; as a separator')" onblur="WaterMarkBlur(this,'Use ; as a separator')" runat="server" ForeColor="gray" ></asp:textbox>
<asp:Button runat="server" ID="cmdButton" Text="Search" />
</div>
</form>
</body>
</html>
Hope now one can implement watermark easily. You can apply the above technique for multiline TextBox TextArea as well.
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