Prevent the letter 'e' and dots from being typed in an input number

Question

I have a simple input number like this:

When trying to input anything other than a number or the letter \"e\

Answer 1

You are correct that it should be done with a directive. Simply create a directive and attach it to the input. This directive should listen for keypress and/or keydown events. Possibly paste events as well. If the char entered is an 'e' or dot -- call event.preventDefault();

angular.module('app', [])
  .directive('yrInteger', yrInteger);

function yrInteger() {
  return {
    restrict: 'A',
    link: function(scope, element, attrs) {
    
      element.on('keypress', function(event) {

        if ( !isIntegerChar() ) 
          event.preventDefault();
        
        function isIntegerChar() {
          return /[0-9]|-/.test(
            String.fromCharCode(event.which))
        }

      })       
    
    }
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app">
  <input 
         type="number" 
         yr-integer
         />
</div>

Answer 2

You can simply use ng-pattern on your input

Controller

$scope.onlyDigits= /^\d+$/;

HTML

<input ng-pattern="onlyDigits" type="number" />

This pattern use \d which is for any numeric value