Use jquery validator in your script tag DEMO
<script src="js/jquery.validate.min.js"></script>
and validate your element by like this
<form name="enquiry_form" method="post" id="enquiry_form">
Full Name *
<input class="input-style" name="name" id="name" type="text"/>
<br>
Email *
<input class="input-style" name="email" id="email" type="email"><br>
Phone *
<input id="mobile" name="mobile" id="mobile"></input><br>
<input type="submit" value="SUBMIT" id="enq_submit">
</form>
$('#enquiry_form').validate({
rules:{
name:"required",
email:{
required:true,
email:true
},
mobile:{
required:true,
minlength:9,
maxlength:10,
}
},
messages:{
name:"Please enter your username..!",
email:"Please enter your email..!",
mobile:"Enter your mobile no"
},
submitHandler: function(form) {
alert("working");
//write your success code here
}
});