jasmine angular

When communicating with some backend APIs, the data travels over the network using the HTTP protocol. As such, failures may occur, is it on our own device (i.e. the browser) or on the server-side which could not be available O R Unable to process our request. We need to handle such error responses and give the user a proper feedback.Import {Httperrorresponset} from ' @angular/common/http '; Export class AppComponent {people; Message Constructor (priv

Use Angular's built-in services, such as $ http and $ location, to efficiently use angular AngularJS provides many built-in services for us. These built-in services can easily implement some common functions. The following is a summary of commonly used built-in services in Angular.1. $ location service $ Location is used to return the URL address of the current page. The sample code is as follows: var app =

What is angular?Angularjs is a framework for developing dynamic Web applications. It allows you to use HTML as a template language and to make your application components clearer and more concise with extended HTML syntax. What makes it so innovative is that it reduces the amount of code through data binding and dependency injection, which is implemented via JavaScript on the browser side and is perfectly integrated with any server-side technology.Ang

In some cases your application might need to upload large amounts of data, such as files. Obviously for a good UX we should provide the user some feedback on the progress of the upload. Angular ' s HttpRequest object has a property reportProgress which allows us to do exactly. Let's see how.//Service:Import {injectable} from ' @angular/core '; import {Observable} from' Rxjs/observable 'Import {HttpClient, H

Angular custom filter and angular Filter

Introduction to angular. js cross-origin post solution, Introduction to angular. js Cross-origin: problems frequently encountered in front-end development. AngularJS implements cross-origin methods similar to Ajax and uses CORS mechanisms. The following describes how to use $ http in AngularJS to implement cross-origin request data. AngularJS XMLHttpRequest: $ http is used to read data from a remote server.

The example in this article describes the function methods or variables that are used to invoke the angular controller outside the angular using JS. Share to everyone for your reference, specific as follows: The effect is shown in the following image before clicking the "Call" button: After clicking on the "Call" button, the effect is shown in the following image: I hope this article will he

You need to define a to is able to use it elsewhere in your app as a TemplateRef . You can store these TemplateRef s in a Service and then access them the from any @Directive or in @Component your app.We want to create a service and a component together to store all the templates.ServiceImport {injectable, templateref} from "@angular/core"; @Injectable () Export class Templatesservice { New map();}Compoment:Import {Component, viewchild} from "@

The HTML code looks like this:1 DOCTYPE HTML>2 HTMLNg-app= "MYAPP"ID= "MYAPP">3 Head>4 Metaname= "Viewport"content= "Width=device-width" />5 title>Testtitle>6 Scriptsrc= "~/content/js/plugins/angularjs/angular.min.js">Script>7 Head>8 BodyNg-controller= "Mycontroller">9 {{msg}}Ten ahref= "javascript:;"ID= "Lbtntest">Calla> One Body> A HTML>The JavaScript code looks like this:1 varNgapp = Angular.module (' myApp '), []);2Ngapp.controller (' Mycontroller ',function($scope, $http

In Angular. JS, the instruction reference template and instruction are described as attributes. angular. jstemplate I. reference template Commands can be simply understood as functions running on specific DOM elements. commands can extend the functions of these elements. The command must take effect. The value of ng-app is the same as the module name of the definition command: angular.module('app',[]) Comp

Angular implements responsive forms and angular response forms Introduction Angular provides a total of three form implementation methods: Template-driven Forms (Template-driven Forms), Reactive Forms (responsive Forms), and Dynamic Forms (Dynamic Forms ). This article only describes responsive forms. What is a responsive form? In fact, the idea is similar to tha

Angular. JS learning dependency injection $ injector details, angular. jsinjector Preface Before dependency injection (IoC), it is very simple and straightforward to create an Object in the program, that is, to create a new Object in the code, we create, maintain, modify, and delete objects on our own. That is to say, we control the entire lifecycle of objects until they are not referenced and recycled. It

1.MVC IntroductionModel-view-controller A software architecture developed for programming languages in the the 1980s Smalltalk . The purpose of the MVC pattern is to implement a dynamic program design that simplifies the subsequent modification and expansion of the program, and makes it possible to reuse a part of the program. In addition, this mode makes the program structure more intuitive by simplifying the complexity. The software system is separated by the basic parts of itsel

By default, the response body doesn ' t contain all of the data that might is needed in your app. Your server might return some special header which you had to read explicitly. In such case we can use the { observe: ‘response’} configuration of the Angular HttpClient . Let ' s explore.Import {injectable} from ' @angular/core 'rxjs/observable 'httpresponse' @angular