Checkbox is one of the important components of form field where user has to check by clicking the option. Checkbox values are directly taken to database or further used to process the script. Checkbox component inside a form has distinct role to play and in some cases only it is used. We can't use checkbox to ask for user to enter his / her email address. Let us try where we will use checkbox and where not to use.
Where to use Checkbox
If we present a set of options to our visitors and ask them give select some or all options then we have to use checkbox. The user can select one or more options. This is the basic difference between checkbox and radio buttons. In radio buttons only one options can be selected from a group and in a checkbox one or more than one option can be selected. Let us try for an example.
Let us present a list of weekdays to our visitor for their choice of days they want to visit a particular training program. Here the visitor can select all days or one day or any combination of days. But if we have the restriction that the visitor can select only one day out of the seven days of the week then we will show a group of radio ( or period ) buttons where only one selection can be made.
Some time we use one checkbox only and expect the visitor to check that button before submitting the form like asking the visitors to agree to site terms and conditions.
Code for a checkbox ( checked or unchecked )
<input type=checkbox name=days value='Sunday'> Sunday
<input type=checkbox name=days value='Monday'> Monday
To make Monday as checked
<input type=checkbox name=days value='Monday' checked> Monday
