PostSparrow

Javascript Code

<input type="text" name="number" id="number" placeholder="Enter Number" >
<script>
	$(document).ready(function(){
	    $("#number").keypress(function(e){
	        var keyCode = e.which;
	        /*
	          8 - (backspace)
	          32 - (space)
	          48-57 - (0-9)Numbers
	        */
	        if((keyCode != 8 || keyCode ==32 ) && (keyCode < 48 || keyCode > 57)) {
	            return false;
	        }
	    });
	});
</script>