Angular 1 meets Angular 2

ng-conf 2015

How can we prepare for Angular 2?

Michał Gołębiowski  |  @m_gol  |  github.com/mzgol

Andrew Joslin  |  @andrewtjoslin  |  github.com/ajoslin

So I have an Angular 1 app...

The best thing you can do to get ready is follow best practices.

Hello, ES6!

var babel = require('gulp-babel');
gulp.task('build', function() {
    return gulp.src('src/**/*.js')
      .pipe(babel())
      .pipe(gulp.dest('dist'));
});
                

Use the Angular 1.4 Router

ES5 Angular 1 Service

angular.module('hype', ['unicorn'])
.service('unicornHype', ['unicornHorn', '$q',
  function(unicornHorn, $q) {
    this.horn = unicornHorn;
    this.findUnicorn = function() {
      var deferred = $q.defer();

      navigator.geolocation.getCurrentPosition(function(pos) {
        this.horn.thrust();
        deferred.resolve('The unicorn is at ' + pos.coords.latitude);
      }.bind(this), deferred.reject);

      return deferred.promise;
    };
  }
]);
            

It's better with ES6!

angular.module('hype', ['unicorn'])
.service('unicornHype', ['unicornHorn', '$q', UnicornHype]);
class UnicornHype {
    constructor(unicornHorn, $q) {
        this.$q = $q;
        this.horn = unicornHorn;
    }
    findUnicorn() {
        return this.$q((resolve, reject) => {
            navigator.geolocation.getCurrentPosition((pos) => {
                this.horn.thrust();
                resolve(`The unicorn is at ${pos.coords.latitude}`);
            }, reject);
        });
    }
}
            

Angular 2 Service

import {UnicornHorn} from "../animals/unicorn";

class UnicornHype {
    constructor(unicornHorn:UnicornHorn) {
        this.horn = unicornHorn;
    }
    findUnicorn() {
        return new Promise((resolve, reject) => {
            navigator.geolocation.getCurrentPosition((pos) => {
                this.horn.thrust();
                resolve(`The unicorn is at ${pos.coords.latitude}`);
            }, reject);
        });
    }
}
            

What's the difference?

Not much.

Directives

Angular 1 directive API

var myModule = angular.module(...);

myModule.directive('directiveName', function factory(injectables) {
  var directiveDefinitionObject = {
    priority: 0,
    template: '<div></div>', // or // function(tElement, tAttrs) { ... },
    // or
    // templateUrl: 'directive.html', // or // function(tElement, tAttrs) { ... },
    transclude: false,
    restrict: 'A',
    templateNamespace: 'html',
    scope: false,
    controller: function($scope, $element, $attrs, $transclude, otherInjectables) { ... },
    controllerAs: 'stringIdentifier',
    require: 'siblingDirectiveName', // or // ['^parentDirectiveName', '?optionalDirectiveName', '?^optionalParent'],
    compile: function compile(tElement, tAttrs, transclude) {
      return {
        pre: function preLink(scope, iElement, iAttrs, controller) { ... },
        post: function postLink(scope, iElement, iAttrs, controller) { ... }
      }
      // or
      // return function postLink( ... ) { ... }
    },
    // or
    // link: {
    //  pre: function preLink(scope, iElement, iAttrs, controller) { ... },
    //  post: function postLink(scope, iElement, iAttrs, controller) { ... }
    // }
    // or
    // link: function postLink( ... ) { ... }
  };
  return directiveDefinitionObject;
});
                

Angular 2 directives

Component Directives

<my-narwhal name="my precious narwhal"></my-narwhal>
            

@Component({
    selector: 'my-narwhal',
    bind: {
        name: 'name'
    }
});
@Template({
    inline: '<div>He is {{ bigName() }}.</div>'
});
class Narwhal {
    bigName() {
        return this.name.toUpperCase();
    }
}
            

He is MY PRECIOUS NARWHAL.

Angular 1 Directive

<my-narwhal name="my precious narwhal"></my-narwhal>
            

myModule.directive('myNarwhal', function () {
    return {
        restrict: 'E',
        scope: {
            name: '@'
        },
        link: function(scope) {
            scope.bigName = function() {
                return scope.name.toUpperCase();
            };
        },
        template: '<div>He is {{ bigName() }}.</div>',
    };
});
            

Angular 1 directives: Eliminate Scope

<my-narwhal name="my precious narwhal"></my-narwhal>
            

myModule.directive('myNarwhal', function () {
    return {
        restrict: 'E',
        scope: {
            name: '@',
        },
        controller: NarwhalController,
        controllerAs: 'myNarhwal',
        template: '<div>He is {{ myNarwhal.bigName() }}.</div>',
    };
    function NarhwalController($scope) {
        this.name = scope.name;
        this.bigName = function() {
            return this.name.toUpperCase();
        };
    }
});
            

Angular 1 directives: eliminate scope

<my-narwhal name="my precious narwhal"></my-narwhal>
            

myModule.directive('myNarwhal', function() {
    return {
        restrict: 'E',
        scope: {},
        bindToController: {
            name: '@',
        },
        controller: NarwhalController,
        controllerAs: 'myNarwhal',
        template: '<div>He is {{ myNarwhal.bigName() }}.</div>',
    };
    function NarwhalController() {
        this.bigName = function() {
            return this.name.toUpperCase();
        };
    }
});
            

angular.component()

<my-narwhal name="my precious narwhal"></my-narwhal>
            

myModule.component('myNarwhal', function () {
    return {
        bind: {
            name: '@'
        },
        controller: NarwhalController,
        template: '<div>He is {{ myNarwhal.bigName() }}.</div>',
    };
    function NarwhalController() {
        this.bigName = function() {
            return this.name.toUpperCase();
        };
    }
});
            

Angular 1 Component => ES6

<my-narwhal name="my precious narwhal"></my-narwhal>
            

myModule.component('myNarwhal', () => {
    return {
        bind: {
            name: '@'
        },
        controller: Narhwal,
        template: '<div>He is {{ myNarwhal.bigName() }}.</div>'
    };
    class Narhwal {
       bigName() {
           return this.name.toUpperCase();
       }
    }
});
            

Thanks!