Angular day 03

angular_day_02.md

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+# Angular
+
+----------------------------
+[TOC]
+
+
+### Knowledge round-up
+
+- **Component**
+
+1. Briefly explain Event Binding in Angular?
+  `Answer: `
+Event binding allows us to send information from the view to the component class.
+  2.  Briefly explain Data Binding in Angular?
+  `Answer: `
+Data Binding happen when we changes in the application state, data will automatically reflected into the view and from view to application.
+  3. What are Event Emitters and how it works in Angular?
+	`Answer: `
+Event Emitter happen when we change a component, it will make a notification that something has changed, via events.
+  4. Explain the life cycle hooks of Angular application?
+`Answer: `
+In Angular, a component has a life cycle.
+First, Angular create it, renders it, creates and renders its children, checks it when its data-bound properties change, and destroys it before removing it from the DOM.
+Life cycle hooks provide us a visibility into components's key life moments and the ability to action when they occur.
+
+  5. Explain the `ContentChild` `ContentChildren` and write an example?
+`  Answer:`
+ `ContentChild` and `ContentChildren` is all show child projected content within the component, but children mean that it is a list of childs content.
+	 `ContentChildren` will not be set until ngAfterContentInit component lifecycle hook.
+	@ViewChildren look for elements in Shadow DOM.
+	 @ContentChildren look for them in Light DOM.
+
+- **Extra**
+  - Briefly explain ElementRef in Angular? Write an example.
+`Answer: `
+ElementRef provides access to the underlying native element (DOM element).
+
+----------------------------------
+
+

angular_lesson_02.md

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+# Angular
+
+----------------------------
+[TOC]
+
+
+### Knowledge round-up
+
+- **Component**
+
+1. Briefly explain Event Binding in Angular?
+  `Answer: `
+Event binding allows us to send information from the view to the component class.
+  2.  Briefly explain Data Binding in Angular?
+  `Answer: `
+Data Binding happen when we changes in the application state, data will automatically reflected into the view and from view to application.
+  3. What are Event Emitters and how it works in Angular?
+	`Answer: `
+Event Emitter happen when we change a component, it will make a notification that something has changed, via events.
+  4. Explain the life cycle hooks of Angular application?
+`Answer: `
+In Angular, a component has a life cycle.
+First, Angular create it, renders it, creates and renders its children, checks it when its data-bound properties change, and destroys it before removing it from the DOM.
+Life cycle hooks provide us a visibility into components's key life moments and the ability to action when they occur.
+
+  5. Explain the `ContentChild` `ContentChildren` and write an example?
+`  Answer:`
+ `ContentChild` and `ContentChildren` is all show child projected content within the component, but children mean that it is a list of childs content.
+	 `ContentChildren` will not be set until ngAfterContentInit component lifecycle hook.
+	@ViewChildren look for elements in Shadow DOM.
+	 @ContentChildren look for them in Light DOM.
+
+- **Extra**
+  - Briefly explain ElementRef in Angular? Write an example.
+`Answer: `
+ElementRef provides access to the underlying native element (DOM element).
+
+----------------------------------
+
+

elementRef-app/.angular-cli.json

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+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "project": {
+    "name": "test-app"
+  },
+  "apps": [
+    {
+      "root": "src",
+      "outDir": "dist",
+      "assets": [
+        "assets",
+        "favicon.ico"
+      ],
+      "index": "index.html",
+      "main": "main.ts",
+      "polyfills": "polyfills.ts",
+      "test": "test.ts",
+      "tsconfig": "tsconfig.app.json",
+      "testTsconfig": "tsconfig.spec.json",
+      "prefix": "app",
+      "styles": [
+        "styles.css"
+      ],
+      "scripts": [],
+      "environmentSource": "environments/environment.ts",
+      "environments": {
+        "dev": "environments/environment.ts",
+        "prod": "environments/environment.prod.ts"
+      }
+    }
+  ],
+  "e2e": {
+    "protractor": {
+      "config": "./protractor.conf.js"
+    }
+  },
+  "lint": [
+    {
+      "project": "src/tsconfig.app.json",
+      "exclude": "**/node_modules/**"
+    },
+    {
+      "project": "src/tsconfig.spec.json",
+      "exclude": "**/node_modules/**"
+    },
+    {
+      "project": "e2e/tsconfig.e2e.json",
+      "exclude": "**/node_modules/**"
+    }
+  ],
+  "test": {
+    "karma": {
+      "config": "./karma.conf.js"
+    }
+  },
+  "defaults": {
+    "styleExt": "css",
+    "component": {}
+  }
+}

elementRef-app/.editorconfig

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+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

elementRef-app/.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# compiled output
+/dist
+/tmp
+/out-tsc
+
+# dependencies
+/node_modules
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+# misc
+/.sass-cache
+/connect.lock
+/coverage
+/libpeerconnection.log
+npm-debug.log
+testem.log
+/typings
+
+# e2e
+/e2e/*.js
+/e2e/*.map
+
+# System Files
+.DS_Store
+Thumbs.db

elementRef-app/README.md

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+# TestApp
+
+This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 1.2.3.
+
+## Development server
+
+Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
+
+## Code scaffolding
+
+Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|module`.
+
+## Build
+
+Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory. Use the `-prod` flag for a production build.
+
+## Running unit tests
+
+Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
+
+## Running end-to-end tests
+
+Run `ng e2e` to execute the end-to-end tests via [Protractor](http://www.protractortest.org/).
+Before running the tests make sure you are serving the app via `ng serve`.
+
+## Further help
+
+To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI README](https://github.com/angular/angular-cli/blob/master/README.md).

elementRef-app/e2e/app.e2e-spec.ts

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+import { TestAppPage } from './app.po';
+
+describe('test-app App', () => {
+  let page: TestAppPage;
+
+  beforeEach(() => {
+    page = new TestAppPage();
+  });
+
+  it('should display welcome message', () => {
+    page.navigateTo();
+    expect(page.getParagraphText()).toEqual('Welcome to app!');
+  });
+});

elementRef-app/e2e/app.po.ts

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+import { browser, by, element } from 'protractor';
+
+export class TestAppPage {
+  navigateTo() {
+    return browser.get('/');
+  }
+
+  getParagraphText() {
+    return element(by.css('app-root h1')).getText();
+  }
+}

elementRef-app/e2e/tsconfig.e2e.json

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+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../out-tsc/e2e",
+    "baseUrl": "./",
+    "module": "commonjs",
+    "target": "es5",
+    "types": [
+      "jasmine",
+      "jasminewd2",
+      "node"
+    ]
+  }
+}

elementRef-app/karma.conf.js

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+// Karma configuration file, see link for more information
+// https://karma-runner.github.io/0.13/config/configuration-file.html
+
+module.exports = function (config) {
+  config.set({
+    basePath: '',
+    frameworks: ['jasmine', '@angular/cli'],
+    plugins: [
+      require('karma-jasmine'),
+      require('karma-chrome-launcher'),
+      require('karma-jasmine-html-reporter'),
+      require('karma-coverage-istanbul-reporter'),
+      require('@angular/cli/plugins/karma')
+    ],
+    client:{
+      clearContext: false // leave Jasmine Spec Runner output visible in browser
+    },
+    coverageIstanbulReporter: {
+      reports: [ 'html', 'lcovonly' ],
+      fixWebpackSourcePaths: true
+    },
+    angularCli: {
+      environment: 'dev'
+    },
+    reporters: ['progress', 'kjhtml'],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    autoWatch: true,
+    browsers: ['Chrome'],
+    singleRun: false
+  });
+};