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toggle navigation typescript c# wpf mvvm entity framework wcf .net visual studio unit testing git career a high level look at angular 2 by jonpreece on sep 03, 2016 in angular , typescript developed by google, angular 2 is the newest version of the popular single page application (spa) framework. angular 2 is a step in a new direction compared to previous versions, but has keep all the best characteristics and “lessons learnt” to deliver a fast, fully featured and rich ecosystem. about angular 2 angular 2 impacts your whole application, or at the least, a section of it, rather than specific pages. angular 2 is best suited to new (“greenfield”) development, as it can be relatively tricky to migrate legacy code (angular 1.x code) to the new version. angular 2 has new concepts, syntax, methodologies, and opinions, but is comparable to as previous versions in the way it works. if you have been following angular development since “the early days” of beta 1, then its been a very rocky road for you. even now (this post was written around the release of rc5), the api is still evolving and new features are being added. whilst this experience has been hard for early adopters, i believe the end result will be a fantastic, easy to use, and performant framework with a lower barrier to entry for all. overview the purpose of this post is to discuss the core concepts of angular 2. we’re not looking to dive into the details at this point, a follow up post on that will come later. we will discuss; pre-processors, build tools, components, dependency injection, interpolation, pipes, directives, event bindings, two way data binding, lifecycle hooks, routing, services and the http client. i have a side project on github, named angular2todo , which is an angular 2 todo application written with angular 2, universal angular , and asp .net core . if you’re interested in server side rendered angular, please check that out. this post is based on my own experience with angular 2, and most of the knowledge has come from developing real world applications, including this one on github . going forward, we will refer to angular 2 simply as “angular”. old versions of angular will be referred to by their version number explicitly. typescript, babel, es6/es5 it is hard to talk about angular 2 without discussing typescript (see typescript playground for a live interactive demo). angular was originally written using atscript , which was an extension of typescript (typescript with additional functionality). however, after much collaboration between the angular team and the typescript team, it was decided to use typescript exclusively instead. angular is written using typescript, however, you don’t necessarily have to write you angular code using typescript, you could use; babel, es5 or es6 if you prefer. if you are familiar with google dart , that is also supported. i believe that angular 2 applications are most commonly being developed using typescript, so i’ll use typescript throughout this post. if you need a summary of typescript, check out my typescript beginners guide on this website, developerhandbook.com. at a high level, typescript is javascript. you can convert all your existing javascript code to typescript as easily as changing the file extension from js to ts. the most useful feature of typescript is its transpiler, which takes your typescript code (which is basically es6), and converts it into es5. why would you want to do this? most developers will want to utilise the new language features of es6, es7 and beyond, whilst not having to worry about cross browser compatibility. support for es6 is shaky at best on the desktop ( microsoft edge, i’m looking at you ), and very poor across mobile devices. typescript takes this pain away by converting your code to es5, which is stable and does have excellent support. build tools as we’re working with typescript, and potentially other tools as well, it makes sense to use build tools like webpack or gulp . build tools can automate repetitive tasks, such as; transpiling the code (typescript to es5), bundling (taking all your individual assets and merging them into one big file), minification (compressing that file for faster delivery to the client), and injection (referencing the new resource in the html). build tools can also watch your changes, and automatically build and refresh the browser automatically, so that you can focus on writing code and developing your application. the angular documentation , once you get beyond the absolute basics , encourages you to split your components (we will discuss these more next) into individual concerns. your javascript, styles (css) and markup (html) are to be placed in individual files (component.js, component.css, component.html). this results in a lot of “chatter” between the client and server and can slow down the user experience (particularly on slower, mobile devices). build tools can solve this problem by automatically injecting the markup and styles into your javascript files at compile time. this is certainly not a task you would want to perform manually! personally i have worked with both gulp and webpack when developing angular applications. i prefer webpack for how well it works, but i do not like the configuration aspect. gulp is much easier to configure, but not as powerful (my feeling) as webpack. i have an example gulp and webpack configuration file on github, that have both been used in real world applications. components components are the basic building blocks of all angular applications. components are small and have their own state per instance (meaning you can reuse the same component many times on a single page without it colliding with other instances). components closely follow the open standard for web components , but don’t have the same pain of cross browser support (the web components standard has not been finalised yet). components are a group of directly related javascript (logic), css (style) and html (markup), which are largely self contained. components in angular are defined using the @component class decorator, which is placed on a class , and take “metadata” which describe the component, and its dependencies. a component might look like this; import { component } from ' @angular/core ' ; import { router_directives } from ' @angular/router ' ; @component({ selector: ' my-app ' , directives: [...router_directives], templateurl: ' ./app.component.html ' , styleurls: [ ' ./app.component.css ' ] }) export class appcomponent { } this is es6/typescript code. we create a class, called appcomponent using the class keyword. the export keyword makes the class “public”, so that it can be referenced elsewhere throughout the application. the @component directive takes an object that describes the component. selector: this is used in your markup. the selector is how you refer to the component in html. in this example, the code would be; <my-app></my-app> directives: these are other components that you want to utilise in the components markup templateurl: the path on the file-system to the markup styleurls: a string array of all the css files used to style the component there are many values that can be passed in here, the main values are displayed. about styling why does angular load the styles in this manner? take the following markup (i’ve trimmed this slightly for simplicity); < tr > < td > ... </ td > < td > {{asdate(calibrationdue.date) | date}} </ td > < td > {{asdate(calibrationdue.expiration) | date}} </ td > < td > {{calibrationdue.registration}} </ td > < td > {{calibrationdue.technician}} </ td > < td > {{calibrationdue.customer}} </ td > < td > {{calibrationdue.vehiclemanufacturer}} </ td > </ tr > this is pre-compiled markup. the compiled, rendered markup looks something like this (again trimmed for simplicity); < tr _ngcontent-dqf-10= "" class= "poi

URL analysis for developerhandbook.com

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https://www.developerhandbook.com/category/angular/
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https://www.developerhandbook.com/career/my-learning-hangover/
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amazon.co.uk
psychologies.co.uk

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Domain Name: DEVELOPERHANDBOOK.COM
Registry Domain ID: 1868067827_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
Updated Date: 2018-06-05T09:34:08Z
Creation Date: 2014-07-23T14:54:34Z
Registry Expiry Date: 2021-07-23T14:54:34Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: ANDY.NS.CLOUDFLARE.COM
Name Server: ROBIN.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
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  REGISTRAR GoDaddy.com, LLC

SERVERS

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DOMAIN

  NAME developerhandbook.com

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STATUS
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NSERVER

  ANDY.NS.CLOUDFLARE.COM 173.245.59.101

  ROBIN.NS.CLOUDFLARE.COM 173.245.58.218

  REGISTERED yes

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