Pseudo-classes for Form Element

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CSS3 introduced some new pseudo-classes for form elements. In this video tutorial we’ll be looking at these 3 pseudo-classes:
:required
:valid
:invalid

required-fields-css3-html5

HTML file
index.html

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< !DOCTYPE HTML>
<html>
<head>
<title>CSS pseudo-classes for form elements</title>
<meta charset="utf-8"/>
<link href="myStyle.css" rel="stylesheet"/>
</head>
<body>
 
<form>
	Text: <input type="text" required/><br />
	Email: <input type="email" placeholder="your@email.com"/>	<br />
	<input type="submit" value="done!"/>
</form>
 
</body>
</html>

Here we have attached a stylesheet where we write css3 form element pseudo-class definition. Here we also take 2 input fields of type text and email respectively. We also make the text field as required. Also add a placeholder to the email input field to provide hint to the user.

CSS file
myStyle.css

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input:required {
	background-color: yellow;
}
 
input:valid {
	background-color: lightblue;
}
 
input:invalid {
	background-color: red;
}

Here the fields which has been specified as required will get a background-color of yellow. valid entries will have a lightblue input field background color, and invalid entry input fields background turns red color.

CSS3 pseudo-classes For Form Element: HTML5


You need to a flashplayer enabled browser to view this YouTube video

YouTube Link: http://www.youtube.com/watch?v=Yw5s0G1uQoA [Watch the Video In Full Screen.]



Note:
CSS3 introduces new form elements like email, number, date etc ..all these fields validate themselves. We need not write lengthy JavaScript code to make small validations – like, checking if the user entered numeric value in the input field marked as age. Since age input field will have a numeric input type, if the user enters any string, we can let the user know about the wrong entry by making use of these css3 introduced pseudo-classes.

Also note that, if you try to submit the form without filling the required fields, you’ll get a little tool tip like message interface, telling you to fill the form field.

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