Understand components in Angular 2
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In Angular 2, components are used to write elements and logic for an application. Components require at least one @Component and one @View annotation. The @Component annotation specifies how a component is instantiated when used in a view, initializing the component and calling its constructor to render the view. For example, when <first-component> is used in the view, it will create the component, call its constructor, and render the component.
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What is $root scope in angularjs
$rootScope is the parent scope in AngularJS that is shared among all other scopes and controllers. It provides a way to share data between controllers since it is globally accessible unlike normal scopes which are isolated to their controllers. The $rootScope is injected into controllers to allow access to its properties and methods from any scope.
How to save log4net into database
Log4net is an open source .net library to log output to a variety of sources like console, SMTP, Plain text, Database etc. Log4net is a port of the popular log4J library used in Java. Log4net developed by Apache Foundation. Full details of log4net can be found at its project homepage. Its powerful tool to logging application output to different targets. Log4net provide different types of provider to save logging into plain text, database etc. Log4net enable logging at runtime without modifying the application binary. Its provide high speed of logging.
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Understand components in Angular 2
- 2. AngularJs1.0 provide directive controllers,scope towrite acomponentswhichcontainsthe logic. In AngularJs1.0 a componentscanbe combinationof directives,controllersandscope. But inAngular2 Components are waytowrite elementsandlogicforapplication. For designacomponentyourequire atleastone @Componentand one @Viewannotation. @Componentannotationspecifieswhenacomponentis instantiatedmeans whenwe use component inour viewthenitwill initializedthe componentandcalled contractorandrenderedthe view. Whena componentisinstantiated,Angular Create DOM for the component. Load selectedtemplate intoDOM Injectobjectsandrenderview Today I am givingone example of components. On followingexample when we use the <first-component></first-component>taginour View then componentwill be create, constructorwillbe called andcomponentrendered. Plnkr - http://plnkr.co/edit/IAQpVBPhgn1JSokQAux2?p=preview Component Example in Angular 2 index.html <!DOCTYPE html> <html> <head> <title>UnderstandComponentsinAngular 2 </title> <script src="https://jspm.io/system@0.18.17.js"></script> <script src="https://code.angularjs.org/2.0.0-alpha.37/angular2.min.js"></script> <script> System.config({ paths: { 'app.js':'app.js' } }); System.import('app.js'); </script> </head> <body> <first-component></first-component> </body> </html>
- 3. app.es6.js //Import Angular import {Component,View,bootstrap} from 'angular2/angular2'; ///Define a component // Annotation section //@Component annotations @Component({ selector:'first-component' }) //@View annotations @View({ template:'<h1>Angular 2 - {{ message }}</h1> ' }) // AngularJs 2 component class MyComponent{ name:string; constructor() { this.message = 'First Component'; } } bootstrap(MyComponent);
- 4. Thanks www.codeandyou.com http://www.codeandyou.com/2015/11/understand- components-in-angular-2.html Keywords - Understand Component in Angular 2, How to use Component in Angular 2, component in Angular 2, Angular 2 component