AngularJS Example:

HTML

<div ng-app='myApp'>
    <input type="text" ng-model="leNom">    
    <h1>Bonjour {{leNom | capitalize}}!</h1>
</div>

JavaScript

var app = angular.module('myApp', []);

app.filter('capitalize', function() {
  return function(s) {
      return s ? s.charAt(0).toUpperCase() + s.slice(1) : '';
  };
});