Validating check box

If a textbox is empty or an option is not selected we can use javascript to display an alert message, and highlight the empty field and also we should make sure the page stays the same and doesn’t get “submitted” Javascript validation is a client side validation and relies on the web browser so it should not be solely relied upon Textbox is the simplest element to validate if empty or not.We need to check if it is equal to null or “” because different browsers act differently so its better to check for both the conditions.Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.For a more detailed introduction to HTML5 form validation you can find some great articles linked under References below.

In other web browsers they can be used in combination with the .In this article we intend to present only a number of simple examples to get you started, covering the basic form elements.Before you ask, and someone always does, these examples will currently work in the following browsers: Safari 5, Chrome 6, Opera 9, Firefox 4 Beta and the i Phone/i Pad.Obviously neither example is very limiting, but it will prevent people from entering completely wrong values, such as phone number, strings with multiple '@'s or spaces.Here is how it appears in Safari (with our CSS formatting to show the (in)valid state): In a similar fashion to the Again, the input box appears as normal: This time the minimum requirement for most browsers is one or more letters followed by a colon. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f]) ) \])\z Or you can look here for more solutions.

The tutorial describes Javascript validation of textboxes, comboboxes, radio buttons and checkboxes.

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Validating check box introduction

Validating check box

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