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![]() Visual Studio Angular 2 Install TypeScript GloballyIf you don’t have Gulp installed globally, use this command: npm install -g gulp-cliOnce you have Node installed, use these instructions to set up and start your simple application:In a browser, navigate to (or the deployed version at ). TypeScript should be installed automatically by NPM, but you can also install TypeScript globally using:We are also using Gulp to build the project. I’m using Node 0.12.6 and NPM 2.9.1. Environment SetupAngular2 source is written in TypeScript, a superset of JavaScript that allows for type definitions to be applied to your JavaScript code (you can find more information about TypeScript at In order to use TypeScript, we need to install the compiler which runs on top of Node.js. We won’t dive deep into these topics yet, but look for later posts that cover each area in more detail.So, let’s begin at the beginning–setting up an environment. Or maybe some of the features of ES7 (or ES2016, the version of JavaScript planned to come out next year) such as Decorators and Observables.This post will give you a quick introduction to these concepts and how they apply to your Angular 2 applications. But what is a component? How do we set up a component in Angular 2?At a high level, a component is a set of functionalities grouped together including a view, styles (if applicable) and a controller class that manages the functionality of the component. ComponentsAngular 2 applications are built using components. This lacks styling, but we can use it to demonstrate a few ways to think about Angular 2 applications. ![]() Public keywordThe public keyword tells TypeScript to put the stockService( camelCase, as opposed to the class name which is PascalCase) variable onto the instance of the StockSearch component. We then pass it into the providers property passed to the Component decorator, which alerts Angular that we want to use dependency injection to create an instance of the StocksService when it’s passed to the StockSearch constructor.The constructor looks pretty bare-bones, but there’s actually quite a bit happening in this single line. We will use this sample to talk about key parts of building an Angular 2 application:Import As with other classes, the import statement makes the StocksService class available. Below is the StockSearch component, responsible for taking user input, calling a service to find stock data, and passing the data to the child StockList component. Examining a ComponentLet’s get into some code. Remove blank rows from excel for mac 2011(Note that this overwrite issue doesn’t apply to directives in Angular 1. If you register a controller by calling app.controller('MyController', …) in two different places in your code, the second one loaded will overwrite the first. If you’re familiar with Angular 1, an analogous line of code would look like this:One key difference between the Angular 1 and Angular 2 dependency injection systems is that in Angular 1 there’s just one large global namespace for all dependencies in your app. Because we used the component decorator, type declarations on the constructor cause Angular’s dependency injection module to create an instance of the StocksService class and pass it to the StockSearch constructor. Type declarationAfter public stockService we have :StocksService, which tells the compiler that the variable stockService will be an instance of the StockService class. Properties and EventsLooking at the template passed to the View decorator, we see a new syntax where some attributes are surrounded by parentheses, some by brackets, and some by both. Without that property defined, Angular wouldn’t do anything with the “ ” HTML tag. So directives: tells Angular to look for the StockList component inside our view.
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