IntelliJ IDEA 2022.1 Help

Angular

Angular is a popular framework for building cross-platform applications. IntelliJ IDEA provides support for Angular and helps you on every step of the development process – from creating a new Angular app and working on the components to debugging and testing it.

Before you start

  1. Download and install Node.js.

  2. Make sure the Angular and AngularJS plugin is enabled on the Settings/Preferences | Plugins page, tab Installed. See Managing plugins for details.

Create a new Angular application

The recommended way to start building a new Angular application is Angular CLI, which IntelliJ IDEA downloads and runs for you using npx. As a result, your application is bootstrapped with a ready to use TypeScript and Webpack configuration.

Of course, you can download Angular CLI yourself or create an empty IntelliJ IDEA project and install Angular in it.

  1. Select File | New | Project from the main menu or click the New Project button on the Welcome screen.

  2. In the left-hand pane, choose Angular CLI.

  3. Specify the project name and the folder to create it in. In the Node Interpreter field, specify the Node.js interpreter to use. Select a configured interpreter from the list or choose Add to configure a new one.

    From the Angular CLI list, select npx --package @angular/cli ng.

    Alternatively, for npm version 5.1 and earlier, install the @angular/cli package yourself by running npm install -g @angular/cli in the Terminal Alt+F12. When creating an application, select the folder where the @angular/cli package is stored.

    Optionally, in the Additional parameters field, specify the extra ng new options to pass to Angular CLI. Code completion is available in this field: as you start typing the name of an option or press Ctrl+Space, IntelliJ IDEA shows you the available options and their description.

  4. When you click Create, IntelliJ IDEA generates an Angular-specific project with all the required configuration files and downloads all the necessary dependencies.

Create an empty IntelliJ IDEA project

  1. Select File | New | Project from the main menu or click the New Project button on the Welcome screen.

  2. In the New Project dialog, from the Language list, select JavaScript.

  3. Name the new project and change its location if necessary, then click Create.

  4. When you click Create, IntelliJ IDEA creates and opens an empty project.

Install Angular in an empty project

  1. Open the empty project where you will use Angular.

  2. In the embedded Terminal (Alt+F12) , type:

    npm install @angular/core

    That will install the core Angular package with the critical runtime parts of the framework.

You may also need to install other packages that are parts of Angular, see the list of packages.

Start with an existing Angular application

To continue developing an existing Angular application, open it in IntelliJ IDEA and download the required dependencies.

Open the application sources that are already on your machine

  • Click Open or Import on the Welcome screen or select File | Open from the main menu. In the dialog that opens, select the folder where your sources are stored.

Check out the application sources from your version control

  1. Click Get from VCS on the Welcome screen. Alternatively, select File | Project from Version Control or <Your_VCS> | Get from Version Control from the main menu.

    <Your_VCS> stands for the Version Control System with which your currently opened project is associated.

  2. In the dialog that opens, select your version control system from the list and specify the repository to check out the application sources from. See Check out a project (clone) for details.

Download the dependencies

  • Click Run 'npm install' or Run 'yarn install' in the popup:

    Opening an Angular application and downloading the dependencies from package.json

    You can use npm, Yarn 1, or Yarn 2, see npm and Yarn for details.

  • Select Run 'npm install' or Run 'yarn install' from the context menu of package.json in the editor or in the Project tool window.

Project security

When you open a project that was created outside IntelliJ IDEA and was imported into it, IntelliJ IDEA displays a dialog where you can decide how to handle this project with unfamiliar source code.

Untrusted project warning

Select one of the following options:

  • Preview in Safe Mode: in this case IntelliJ IDEA, opens the project in a "preview mode" meaning you can browse the project's sources but you cannot run tasks and script or run/debug your project.

    IntelliJ IDEA displays a notification on top of the editor area, and you can click the Trust project… link and load your project at any time.

  • Trust Project: in this case, IntelliJ IDEA opens and loads a project. That means project is initialized, project's plugins are resolved, dependencies are added, and all IntelliJ IDEA features are available.

  • Don't Open: in this case IntelliJ IDEA doesn't open the project.

Learn more from Project security.

Write and edit your code

This chapter provides Angular-specific hints. For general guidelines, see Write and edit source code and TypeScript

Create Angular components

With IntelliJ IDEA, you can create Angular components in several ways:

Create a component using a predefined template

IntelliJ IDEA provides predefined live templates for creating Angular components, such as a-component, a-component-inline, and a-component-root. See Live templates for details.

To view a full list of predefined templates, open the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | Live Templates, and expand the Angular node.

  1. In the editor, press Ctrl+J, select the appropriate template (for example, a-component) from the list, and then press Enter.

  2. IntelliJ IDEA generates a component stub, places the caret at a field with canvas, and waits for you to specify the component name there. As you type the component name, the name of the selector and the template URL are filled in automatically in accordance with the Angular Style Guide.

Create an Angular component using a predefined code snippet

Learn how to customize a template with variables from Using and Creating Code Snippets in WebStorm Blog.

Create a component folder

In IntelliJ IDEA, you can create a bunch of files for an Angular component in one action and even place them all in a separate folder. To do that, you need to use a file template with several child templates. When you create a file from the parent template, the related files from the child templates are generated automatically. See Templates with multiple files for details.

Suppose you want to create an example folder with a bunch of component files, for example, example.component.ts for logic, example.component.html for the template, and example.component.css for styles. You can create a file template with two parent templates so all the three files will be generated at once an placed in a separate folder.

  1. In the Settings/Preferences dialog (Ctrl+Alt+S), select Editor | File and Code Templates.

  2. First create a template for a TypeScript component file.

    • In the Files tab, click the Create Template button on the toolbar. A new, Unnamed, template is added to the list.

    • In the right-hand pane, specify the template name, let it be Angular Component, and component.ts as the file extension.

    • In the File name field, type $NAME/$NAME.

    • Optionally, add a code template, for example:

      ** * Created by ${USER} on ${DATE} */ import { Component } from '@angular/core';
    Create parent template

    Click Apply.

  3. Create a child template for the related HTML file.

    • Select the parent template Angular Component and click the Create Child Template File on the toolbar. A child template is added below the Angular Component template.

    • In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.html extension.

    Create child template: component.html
    Create child template: component.html

    Click Apply.

  4. Create a child template for the related Style Sheet.

    • Select the parent template Angular Component and click the Create Child Template File on the toolbar. A child template is added below the Angular Component template.

    • In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.css extension.

  5. Click OK to save the templates.

  6. Create the component files.

    From the context menu of the folder where you want to store the component files, select New | Angular Component. In the dialog that opens, specify the name that will be used for the folder and for the component files in it (example in this example).

    Create an Angular component from a multiple files template in a separate folder

Extract a component from a template

The Extract Angular component refactoring works by running ng generate component, taking schematic preferences inside your angular.json file into account.

  1. In an HTML template file, select the code fragment that you want to extract into an Angular component.

  2. From the context menu of the selection, choose Refactor | Extract Component.

    Alternatively, press Ctrl+Alt+Shift+T and select Extract Component from the Refactor This popup.

  3. In the dialog that opens, specify the name of the new component.

Navigate through an Angular application

When working on Angular projects you have to jump between different component files, such as TypeScript, template, and style files. With IntelliJ IDEA, you can do that using the Navigation bar, or the Project view, or the Go to File action Ctrl+Shift+N.

You can also download the Angular CLI QuickSwitch plugin and install it on your computer.

Yet another way is the Related Symbol popup.

  1. In an Angular component file, press Ctrl+Alt+Home or select Navigate | Related Symbol from the main menu or Go To | Related Symbol from the context menu. IntelliJ IDEA shows a Related Symbol popup with a list of related files. In a TypeScript component file, the popup also lists all the symbols that were imported into this file.

    Navigating through an Angular app using the Related Symbol popup

  2. To open a file, select it and press Enter. Alternatively, use the numbers associated with each file type:

    1. The TypeScript file with the component class

    2. Template

    3. Tests

    4. Styles

Add new features with ng add

In projects that use Angular CLI 6 or later, you can use the Angular Dependency action to add new libraries. This action runs the ng add command which installs the dependency and updates the app with a special installation script. Note that not all libraries support installation with ng add.

  1. Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Dependency.

  2. From the list, select the library to add. The list shows the libraries that can be definitely installed with ng add. To install a package that is not on the list, scroll to its end and double-click the Install package not listed above link, then specify the package name in the dialog that opens.

    The example below illustrates adding Angular Material to a project.

    Adding Angular Material to a project with ng add

If you manage dependencies manually through your package.json, IntelliJ IDEA still recognizes packages that support ng add. When you add such package to package.json, IntelliJ IDEA suggests installing it with ng add.

IntelliJ IDEA suggests adding a dependency with ng add

If such dependency is already installed, you may still want to reinstall it with ng add. In the package.json file, select the name of the package, press Alt+Enter, and click Reinstall with ng add.

Reinstalling a package with ng add

Generate code with Angular Schematics

In Angular CLI 6 projects, IntelliJ IDEA can generate code using both schematics defined in libraries like @angular/material and those defined in Angular CLI itself. For earlier versions, IntelliJ IDEA generates only components, services, and other blueprints defined in Angular CLI.

  1. Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Schematic.

  2. From the list, select the relevant schematic.

    Choosing Angular Schematic

  3. In the dialog that opens, specify the name of the schematic to be generated and additional options, if necessary. IntelliJ IDEA shows the description of the schematic and provides code completion and description for available options.

    Generating Angular CLI schematic: code completion and description is provided

View parameter hints

In Angular HTML templates, Parameter hints show the names of parameters in methods and functions to make your code easier to read. By default, parameter hints are shown only for values that are literals or function expressions but not for named objects.

Configure parameter hints

  1. Open the Settings/Preferences dialog (Ctrl+Alt+S) and go to Editor | Inlay Hints | Angular HTML template.

  2. Select Parameter hints from the list, make sure the Show parameter hints checkbox is selected, and then specify the context where you want parameter hints shown.

    The preview below shows how the changes you make in the settings affect the code appearance.

  3. For some methods and functions, IntelliJ IDEA does not show parameter hints in any context. Click Exclude list... to view these methods and functions, possibly enable parameter hints for them, or add new items to the list.

Inspect your code

IntelliJ IDEA brings a number of Angular-specific inspections that help you find errors as you edit your code and suggest quick-fixes for them.

In the example below, both a template and a templateUrl properties are used. IntelliJ IDEA detects the error, warns you about it, and suggests a quick-fix.

Angular inspection: duplicate properties

Another example shows how IntelliJ IDEA warns you about incorrect use of the *ngIf and *ngFor structural directives.

Angular inspection: incorrect use of structural directive

View the list of Angular-specific inspections and configure them

  1. In the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | Inspections.

  2. Expand the Angular node.

  3. Configure inspection profiles and severity, disable and suppress predefined inspections, and create custom ones as described in Code inspections.

Use Angular Material Design components

IntelliJ IDEA recognizes Angular Material components and attributes and provides coding assistance for them:

  • Completion for components

    A list of suggested completion variants for an Angular component

  • Completion for attributes

    A list of suggested completion variants for an Angular attribute

  • Navigation between a component or an attribute and its declaration (press Ctrl+B or select Go To | Declaration from the context menu).

Install Angular Material

Configure syntax highlighting

You can configure Angular-aware syntax highlighting according to your preferences and habits.

  1. In the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | Color Scheme | Angular Template.

  2. Select the color scheme, accept the highlighting settings inherited from the defaults or customize them as described in Colors and fonts.

Run and debug an Angular application

For applications created with Angular CLI as described above, IntelliJ IDEA generates two run/debug configurations with default settings:

  • An npm configuration with the default name Angular CLI Server. This configuration runs the ng serve command that launches the development server and starts your application in the development mode.

  • A JavaScript Debug configuration with the default name Angular Application. This configuration launches a debugging session.

Run an Angular application

  1. Select the Angular CLI Server run configuration from the list on the toolbar and click Run next to the list.

    Alternatively, run npm start in the Terminal Alt+F12, or double-click the start task in the npm tool window (View | Tool Windows | npm), or click the Run icon in the gutter next to the start script in package.json.

  2. Wait till the application is compiled and the Webpack development server is ready.

    The Run tool window or the Terminal shows the URL at which your application is running, by default it is http://localhost:4200/. Click this link to view the application.

    Running Angular CLI app: the Webpack Development server is ready

Debug an Angular application

You can start a debugging session in different ways depending on how your application was created and where it is running.

Debug applications created with Angular CLI

  1. Set the breakpoints in your code.

  2. Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.

  3. Select the autogenerated Angular Application configuration from the list and click the Debug button next to the list.

    Start a debugging session via a run configuration

Debug applications running on localhost

  1. Set the breakpoints in your code.

  2. Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.

  3. The Run tool window or the Terminal shows the URL at which your application is running, by default it is http://localhost:4200/. Hold Ctrl+Shift and click this URL link. IntelliJ IDEA starts a debugging session with an automatically generated Angular Application configuration of the type JavaScript Debug.

    Starting a debugging session from the Run tool window

Debug applications running on custom URLs

  1. Set the breakpoints in your code.

  2. Start the application in the development mode as described above and wait till the application is compiled and the Webpack development server is ready.

  3. The Run tool window or the Terminal shows the URL at which your application is running. Copy this URL address, you will later specify it in a debug configuration. To view your application, just click the link.

  4. Create a JavaScript Debug configuration. To do that, go to Run | Edit Configurations on the main menu, click the Add icon, and select JavaScript Debug from the list. In the Run/Debug Configuration: JavaScript Debug dialog, paste the saved URL in the URL field and save the configuration.

  5. To launch your newly created configuration, select it from the list of configurations and click the Debug button next to the list.

When the first breakpoint is hit, switch to the Debug tool window and proceed as usual: step through the program, stop and resume program execution, examine it when suspended, explore the call stack and variables, set watches, evaluate variables, view actual HTML DOM, and so on.

Last modified: 10 August 2022
JavaScript AngularJS