injectable angular2

Detailed explanation of Http request principles and usage in angular2 and angular2 This document describes the principles and usage of Http requests in angular2. We will share this with you for your reference. The details are as follows: Provide HTTP Services HttpModule is not the core module of Angular. Angular is an optional method for Web access.@angular/http.

can be used to determine whether to allow access to this routing state and whether to leave this routing state. The canactivate in the following example is used to determine whether access is allowed, and the service class needs to inherit the Canactivate interface. Import {Authguard} from ' ... /auth-guard.service '; Const Adminroutes:routes = [ { path: ' admin ', component:admincomponent, canactivate: [Authguard] , Children: [ { path: ', children: [ {

"Preface" This is also from the document written by Xiaofeng, I do end-to-end testing when the project is used. "Body" Project Flow install webstorm-Continuous Integration Server Download Address: http://www.jetbrains.com.cn/webstorm.html New ANGULAR2 Project Enter directly from the command prompt: ng New Angular-cli-project PS:ANGULAR2 basic files have been created, the next is to download the project depends on the Nodejs package, with Ng ne

Angular2 entry-Architecture Overview, angular2 Architecture OverviewToo many rows too many rowsIntroduction 　　In March 23, Angular4 was officially released (not 3 ). It seems that Angular2 is now learning again later-_-|. Angular2 has made great changes based on Angular1. I asked an

Implementation of Angular2 form custom validators, angular2 form This article describes how to determine the result of the validators. Here, we will look at how to implement a custom validators. Target We need to implement a mobile phone number verification tool. The instance used is based on the instance in the previous article, that is, the form page of user information input. We add a cell phone number v

Example code of the angular2 series route transition animation and angular2 example code Angular2's animation system gives you the ability to make a variety of animation effects, and strives to build an animation with the same performance as the native CSS animation. Angular2 animation is mainly combined with @ Compone

Angular2 entry-Data Binding and angular2 entry-level bindingToo many rows too many rowsIntroduction In Angular2, the data binding method is one-way by default. The data binding method can be divided: 1. Property binding and interpolation expression component class-> Template 2. Event binding: Template-> component class 3. Bidirectional binding: Template Zookeepe

Angular2 getting started, angular2 getting started Recently, versions of angular2, 1, and 2 have changed significantly. The following summarizes some learning websites and installation steps. Official Chinese website (required ): Https://angular.cn Lazy learning: Http://www.imooc.com/learn/789 Support for bootstrap UI Components Https://github.com/angular-ui/boo

here, Angular2 is packaged in production mode with Webpack2:Use rollup packaging or comparison pit, function and plug-in is not as webpack, the key does not support code separation, resulting in angular lazy loader will not be able to use. Specific steps:Angular=>aot=>webpack (Tree shaking Uglify)angular=>aot:First you need to rely on:"@angular/compiler" "@angular/compiler-cli" "@angular/platform-browser".NPM Install Them.Here is the directory structu

Angular2 searches for and resets the button for a live animation, and angular2 for a live Animation Requirement: Add a search and reset transfer animation to the Project Management page. The first thought was to use angular2's animations attribute. // project.component.tsimport {trigger, state, style, animate, transition} from '@angular/animations';@Component({ s

Previous Article Angular2 Introductory series Tutorials-Multiple components, master-Slave relationsIn programming, we typically separate the data provided to avoid repeatedly copying the code that pastes the data request during the program's writingThe concept of dependency injection is provided in Angular2 so that we can do it gracefully. Simply described here, dependency injection allows us to write code

Angular2 countdown component usage details, angular2 Usage Details The project encounters a countdown requirement. Considering that it will be used in other modules in the future, it encapsulates a component by itself. It is easy to reuse later. The component requirements are as follows:-Receiving the delivery deadline of the parent component-Receive parent-level component delivery title Component Effect V

How to use pipeline Pipe of Angular2, and pipeline pipe of angular2 Pipeline Pipe can use data as input and convert and output data according to rules. There are many built-in Pipe in Angular2, such as DatePipe, UpperCasePipe, and currenpolicipe. Here we will mainly introduce how to customize Pipe. 1. MPS queue Definition The following code defines Pipe: import {

Angular2 custom paging component, angular2 custom Paging In the project, parameters sent from the frontend to the backend are as follows: PageSize: number of entries per page PageNo: Current page number For example, if there are currently 1st pages and 20 records on each page, the background returns 20 records on 1st pages (SQL should use limit to retrieve paging data) At the same time, the back-end interfa

false when the user decides return This. _dialog.confirm (' Discard changes? ')); }This code, after you have modified the crisis information, neither click Save nor click Cancer when triggered. That is this._dialog.confirm (' Discard changes? ') ); pops up a dialog box: Why use a separate dialog service here? Why not go directly to window.confirm ()? Because the life cycle of a route accepts a bool or promise object (NG1, too). And Window.confirm does not return a Promise object, we need to

First, the following framework basic process (Web > WebService "front-end Architecture") > (nodejs "Data Broker") > (API "Background interface")--web (HTML angular framework)--webservice (the service file written in angular, where it was possible to use the "ng2-file-upload" plug-in file + parameters to merge the submission, but request a unified commit in my project, so using a third-party plug-in here is less appropriateSo I wrote XMLHttpRequest for form data Merge commit, angular HTTP post is

Problem What to look for when using dependency injection What services are generally used to do What is the general use of directives? Angular2 How to extract public components Angular2 why not need to mention public components How to communicate between parent and child components When should I use Ngmodel? Why do you use typescript? I like JavaScript. Why do I have

The ANGULAR2 view is dynamic, and without modifying the source data bound to the UI, we can change whether the data is rendered, rendered, or rendered in the form of instructions.(1). The most commonly used directives provided by ANGULAR2 are:1.*ngif= ' expression ', which is loaded or written in the current element by the result of expression operation.　　2.*ngfor= ' expression and declarations ' loop input

example in opaquetoken that we have provided a constant as a definition object for App_config. {provide:app_config, usevalue:hero_di_config} The value of a value provider must be defined immediately. The value of it cannot be defined afterwards. It is clear that the title string is immediately available.2.4.2 Useclass-Class providerThe UserClass provider creates and returns a new instance of the specified class. Use this technique to provide an alternative implementat

Today we are going to talk about the concept of ng2 service, like NG1, the service is usually used to send HTTP requests, but in fact you can encapsulate any of the methods you want to encapsulate, and sometimes the communication between the controller depends on the service to complete, let us see quickly!ExampleExample is the official example, load a list of heroes, click Show Details. I put it directly in our upgraded gear.SourceInjectableHow do you write services in NG2? Very simple, you jus