input type text with number only code example

Example 1: type numeric value only in textbox javascript

<input type="text" class="textfield" value="" id="extra7" name="extra7" onkeypress="return isNumber(event)" />

Example 2: input text tag only input integer number

<input type="text" class="number" />

<script>
function degitOnly(e){
    var unicode = e.charCode ? e.charCode : e.keyCode;
      if (unicode!=8 && unicode!=9)
     {
     	 if (unicode<46||unicode>57||unicode==47)
     		 return false
    }
}

$(".number").inputFilter(function(value) {
    return /^-?\d*$/.test(value);
});
</script>