JSFiddle - React, Tailwind, and code Playground

HTML

<body ng-app="myApp">
<div ng-controller="parentCtrl">
    <form action="http://asamplesite.com" method="POST" name="myForm">
    <input type="text" ng-model="message" />
        <input type="submit" value="submit"/>
    </form>
    <button ng-click="setAction()">Set Action</button>
</div>    
</body>

JavaScript

angular.module('myApp', [])
.controller('parentCtrl', ['$scope', function($scope){
    $scope.setAction= function(){
        document.myForm.action='http://www.google.com';
    };
}]);