Tuesday, January 22, 2013

Watermark in textbox using JavaScript

In the web application development, developers always try to make UI more user-friendly and interactively. Showing watermark on textbox is one of the tools to increase user-interactivity of website. Most of the sites use the watermark mainly for “Search” functionality. In this post I will show you a simple implementation of watermark in textbox using JavaScript.
So, let’s start the watermark implementation in textbox.

1- Aspx Page
<form id="form1" runat="server">
        <asp:TextBox ID="txtWatermarkDemo" runat="server" CssClass="watermark"></asp:TextBox>

2- CSS styles for watermark and simple textbox
<style type="text/css">

3- JavaScript Code for watermark
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script type="text/javascript">
//function to remove the search keyword when focus is on textbox
        function onFocusWatermark(txtid,strWatermark) {
            var txtval = txtid.value;
            if (txtval == strWatermark) {
                txtid.value = '';

//function to show the search keyword when leave the textbox empty
        function onBlurWatermark(txtid, strWatermark) {
            var txtval = txtid.value;
            if (txtval == '') {
                txtid.value = strWatermark;

4- Code behind
protected void Page_Load(object sender, EventArgs e)
   if (!IsPostBack)
     string strSearch = "Search";
     txtWatermarkDemo.Text = strSearch;
     txtWatermarkDemo.Attributes.Add("onFocus", "onFocusWatermark(this,'" + strSearch + "')");
     txtWatermarkDemo.Attributes.Add("onBlur", "onBlurWatermark(this,'" + strSearch + "')");

In the code behind I have added onFocus and onBlur properties to asp.net textbox for referencing the relevant JavaScript function.
Here you can see the complete implementation of watermark in textbox.
Happy coding!!
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