Introduction

In this article I am going to describe how to validate the checkbox using jQuery. Checkbox validation is usually more difficult due to its nature of having multiple values at the same time.

To validate a checkbox Consider a simple form where a user is required to select at least one checkbox. Let's see the steps to create this type control using jQuery.

Step 1 : Firstly we have to create a web Application.

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Step 2 : Secondly you have to add a new page to the website.

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Step 3 : In this step we are going to see that see from where the js reference will be added to the source page of the Akshay.aspx page.

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Step 4 : Now we are going to write the script code which will be inside either on the head section or in the body section it will depend upon you which way you like most to placed it.

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Step 5 : In this step we are going to write the jQuery code which is given below.

<script type="text/javascript">
 $(function () {
$('input[id$=btnSubmit]').click(function (e) {
var checked = $(':checkbox:checked').length;
if (checked == 0) {
alert('Atleast One hobby Should Be Selected');
e.preventDefault();
}
else {
alert('Postback occured');
}
});
});
</script>

This code is straightforward. When the button is clicked, we first count the checkboxes that are checked using $(':checkbox:checked').length . If the length is 0 (zero), we alert the user and prevent the user from submitting the form using e.preventDefault().

Step 6 : In this step you will see the body code of the Akshay.aspx page which is given below.

<body>
 <form id="form1" runat="server" style="background-color: #FFFF00">
 <br />
 First name
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
 <br />
 <br />
 Last name
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
 <br />
 <br />
 Email Address
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
 <br />
 <br />
 Country
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
 <br />
 <br />
 <asp:CheckBox ID="CheckBox1" Text="Sport" runat="server" />
<asp:CheckBox ID="CheckBox2" Text="Reading Book" runat="server" />
 <br />
 <br />
 <asp:CheckBox ID="CheckBox3" Text="Swimming" runat="server" />
<asp:CheckBox ID="CheckBox4" Text="Cooking" runat="server" />
 <br />
 <br />
 <asp:CheckBox ID="CheckBox5" Text="Computing" runat="server" />
<asp:CheckBox ID="CheckBox6" Text="Listening to Music" runat="server" />
<br />
 <br />
 <br />
 <asp:Button ID="btnSubmit" runat="server" Text="Submit" ToolTip="Select atleast one hobby before clicking" />
 <div>
 </div>
 </form>
</body>

Step 7 : In this step we will write the Complete code for the Akshay.aspx page which is given below.

Code

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Step : The design of akshay.aspx is.

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Step 8 : Now we are going to run the application by pressing F5 and the related output is given below.

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Click on Submit Button.

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