formbuilder angular2

The purpose of the angular module is to organize the logical structure of the app. The class used by @ngmodule in Ng is considered to be a NG module. Ngmodule can manage components, directives, pipes within the module, introduce service, and control the access of external components to internal members. ANGULAR2 has the concept of the module, and responds to the call of the backstage program, cohesion well-structured classes the low coupling. Module

component, app.component.ts, is just a container. Import {Component} from ' @angular/core '; @Component ({ selector: ' App-root ', templateurl: './app.component.html ' }) Export class appcomponent { } Implementation of bidirectional binding twoway-bind.component.ts: Import {Component, OnInit} from ' @angular/core '; @Component ({ selector: ' App-twoway-bind ', Template: ' Note that the above [(Ngmodel)] This writing, () represents the output, [] represents the input, th

() { this.info=student; } HTML: In property bindings, a value is passed from the model to the target property on the screen. We mark the target property by enclosing the name in square brackets, []. This is a one-way data binding from the model to the view. In event bindings, values are passed from the target property on the screen to the model. We mark the target attribute by enclosing the name in parentheses, (). This is a reverse one-way data binding from view to model. When the bindi

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

Shadowdom-Encapsulating private stylesANGULAR2 uses shadowdom as the rendering basis for the component, which means that the component is rendered to a separate shadow tree, which is good for good encapsulation of DOM objects and styles:The problem is that most browsers, except for Chrome, do not currently support Shadowdom, so ANGULAR2 provides three strategies for rendering templates to the DOM.Taking the following template as an example, we look at

OverviewANGULAR2 's official recommendation should be to use SYSTEMJS to load, but when I use the tree shaking, I find that if I use Systemjs+rollup, I can only package it into one file, and then lazy loading can't do it.So I used webpack2,webpack2 with the tree shaking, as long as the Tsconfig in the module set to es2015, although the effect is not rollup good, but support lazy loading.In addition, ANGULAR2 currently does not support typescript 2.1.X

If you have seen Angular2 's official website, you should know that you can quickly build a angular project with CLI tools, install node. js and NPM before installing the CLI, and node. JS has a version of 6.9.0 or more, NPM should be above 3.0.0.My node. js and NPM were installed successfully, but always made an error while installing ANGULAR/CLI, and later knew that node. JS had to install the 6.9.4 version.Before installing node. js, if you do not

This article mainly introduces how to judge the results of the validator. Here, let's look at how to implement a custom validator. Goal We want to implement a verification of the phone number of the validator, the use of the example or based on the previous article inside the example, that is, the user information entered the form page. We add a validator that verifies the phone number on the element of the cell phone number. Then, if the phone number verification fails, an error is displayed,

Cross-origin access to ASP. net mvc in Angular2, angular2mvc Application scenarios 　　Project Development decides to use angular2 for frontend and backend separate development. I am responsible for backend service development. At first, I chose web api for development. Cross-origin access is supported through API middleware + filter. After a development period, the notification needs to be transplanted to

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

Today we are going to talk about ANGUALR2 template grammar, the official website is very clear, but I also use the easy-to-understand way to list it!ExampleSourceHow to run:Install NPM Run PlayOpen port 8080. This example is my small demo, which introduces several commonly used template syntax.Property bindingsNo special instructions are required, just use [value], and not just value,[] can be the property of any common HTML element!Src/app.html[value]= "FirstName" [placeholder]= "Firstnameplac

Inject a complex serviceEzalgo is fairly simple, and using new or using injector to get an instance looks a little different. What if our Ezapp component is going to use the HTTP service?At first glance, the HTTP service is clearly a really useful service-because it looks quite complex-HTTP relies on Xhrbackend and baserequestoptions, and Xhrbackend relies on BROWSERXHR.There are two ways we can get an instance of HTTP in order to get the functionality of network access through it:1. Instantiati

Application Scenarios 　　Project development decided to use ANGULAR2 for front-end separation development, I was responsible for the development of the backend services, initially selected the Web API for development. Cross-domain access is supported through API middleware + filters across domain access. After a period of development, the notification needs to be ported to the MVC4 project to publish ANGULAR2