How to get only numbers in textbox using jQuery?

// Restricts input for each element in the set of matched elements to the given inputFilter.
 (function($) {
     $.fn.inputFilter = function(inputFilter) {
     return this.on("input keydown keyup mousedown mouseup select contextmenu drop", function() {
         if (inputFilter(this.value)) {
         this.oldValue = this.value;
         this.oldSelectionStart = this.selectionStart;
         this.oldSelectionEnd = this.selectionEnd;
         } else if (this.hasOwnProperty("oldValue")) {
         this.value = this.oldValue;
         this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd);
         }
     });
     };
 }(jQuery));

 // restrict input to receive just numbers
 $("#my_input_num").inputFilter(function(value) {
     return /^\d*$/.test(value);
 });

#javascript #jquery #input #number