JavaScript code for prevent user for enter only numbers

JavaScript code for prevent user for enter only numbers

This is a JavaScript code for prevent user for enter only numbers in text box……

 <html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.2.js"></script>
<script>
function Submit(){
fcontact=document.form.contact.value;
 if( fcontact == "" )
   {
     document.form.contact.focus() ;
  document.getElementById("errorBox").innerHTML = "enter the contact number";
     return false;
   }    
}
$(function () {
$('#contact').keydown(function (e) {
if (e.ctrlKey || e.altKey) {
e.preventDefault();
} else {
var key = e.keyCode;
if (!((key == 8) || (key == 32) || (key >= 48 && key <= 57))) {
e.preventDefault();
}
}
});
});
</script>
</head>
<body>
       <form name="form" >
         <div id="errorBox"></div>
        <input type="text" name="contact" value=""  placeholder="Enter Contact" class="input_contact" id="contact">
      <div>
        <p id="sign_user" onClick="Submit()">Sign Up </p>
      </div>
</body>
</html>

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