ngif angular2

You can watch for form/control changes by using. Valuechanges.observe ({...}): This . Sku.valueChanges.observer ({ Next: (value)={ console.log ("SKU has changed to:" , value); } }) This . MyForm.valueChanges.observer ({ Next: (value)={ console.log ("form has a change To: ", value); } })Code:Import {Component, View, Form_directives, validators, Formbuilder,

Define a filed should has validation:Export class Demoformsku { myform:controlgroup; Sku:abstractcontrol; Constructor (Fb:formbuilder) { this. MyForm = Fb.group ({ "SKU": ["" ", Validators.required] }); This this. myform.controls[' SKU ']; } OnSubmit (value) { console.log (value); }}Form message*ng-if= "!myform.valid" class= "bg-warning"> Form is invaliddiv>Field message*ng-if= "!sku.valid" class= "bg-warning">

First, what's directive, what's the difference between component and directive.For my understanding, Component is something like ' canvas ', ' form ', ' table ' ... they has the template and their own functionality. It defines how a HTML tags should work like and look like. directive is something like ' ngif ', ' Required ', ' checked ' ... they don ' t necessary to has their own template (of course th EY can have). It Change the origina

Why ANGULAR2Angular1.x obviously very successful, then, why do we have to turn violently to Angular2? Limitations of performance Angularjs was originally an internal tool for designers to quickly build HTML forms. Over time, various features are added to suit the development of applications in different scenarios. However, due to the initial architectural constraints (such as bindings and templating mechanisms), performance improvements have been ver

Why ANGULAR2Angular1.x obviously very successful, then, why do we have to turn violently to Angular2? Limitations of performanceAngularjs was originally an internal tool for designers to quickly build HTML forms. Over time, various features are added to suit the development of applications in different scenarios. However, due to the initial architectural constraints (such as bindings and templating mechanisms), performance improvements have been

(iv) ANGULAR4 heroic journey heroconquest-Master-slave structure Master and slave structure At the same time in a component, contains a main structure module, including several other from the module, from the module to rely on the main module. app.component.ts File Import ANGULAR4 core modules: Import {Component} from ' @angular/core '; To define a template: @Component ({selector: ' app-root ', Template: ' class and property definitions Export class Appcomponent {title = ' My Conquest

ANGULAR2 components first understand the meaning of the ANGULAR2 componentThe application of ANGULAR2 is the collection of a series of componentsWe need to create reusable components for reuse by multiple componentsComponents are nested, and components in real-world applications are nested with each otherData calls in a component can use inputs and outputsA compo

2015 soon passed, which was an important year for Wijmo, especially for Wijmo5. Leaving the traditional widgets and re-writing a set of JS controls now seems to be the right decision. Writing Wijmo5 with TypeScript means that we don't have any dependencies and no longer need jquery,wijmo5 to be a set of pure controls. This important decision puts our products at the forefront of the industry. Google's ANGULAR2 development team also uses TypeScript and

Recently in the use of learning Angular2, actually read the ANGULAR2 document know, compared to the previous changes in the ANGULAR1,ANGULAR2 is quite large.For the ' angular2 ' Local development environment, we first need to install the Nodejs locally We can go to the official website clone a QuickStart demo

The SRC folder in Ionic2 is our main work area and we look at the structure of this folder: app assets pages theme Altogether four folders. The main two folders are app and pages App is the root directory for Ionic applications, and the pages are child-built.Let's look at the five files below the app.APP.SCSS is used to set the global CSS style, generally we do not need, so there is nothing to say.App.module.ts we call it the root module, unless you have a great enough to write an oversized appl

This is the first time to pause the next blog-you draw my guess the progress, because in this game, want to use the latest NG2 technology, but the pit is a piece after another, this way first introduced the environment deployment and pits historySince to use NG2, first to get resources, I use the AngularJs2 beta version of the online resources have two kinds, One is a fully compressed version of the file. Min.js version of the other is a lot of messy JS files, mainly ng2 has been fully adopted t

Angular 2 Study notes (a) first application Building Custom Components Accept user input from form (form) Render a list of objects and use view warfare Listen (intercepting) the user clicks the event and performs the action Getting StartedtypescriptIt is recommended to start programming Angular 2 using TypeScript. Angular 2 has ES5 API, but Angular 2 is written in TypeScript and most people use TypeScript. Writing Angular 2 with TypeScript is more beautiful and easy.//