PhpStorm 2018.3 Help

JavaScript

With PhpStorm, you can develop modern web, mobile, and desktop applications with JavaScript and Node.js.

PhpStorm supports JavaScript and TypeScript programming languages, React and Angular frameworks and provides tight integration with various tools for web development.

On this page you will find a short Getting Started Guide that will walk you step by step from creating a web application to debugging and testing it.

Creating a new application

  1. Choose File | New | Project on the main menu or click Create New Project on the Welcome screen. The Create New Project Dialog opens.

  2. In the left-hand pane, choose Empty Project.

  3. In the right-hand pane, specify the path to the folder where the project-related files will be stored. Click Create.

Starting with an existing JavaScript application

If you are going to continue developing an existing JavaScript application, open it in PhpStorm, choose the JavaScript version to use, and configure the libraries in it. Optionally download the required npm dependencies.

To open the application sources that are already on your machine

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

To check out the application sources from your version control

  1. Click Check out from Version Control on the Welcome screen or choose VCS | Check out from Version Control on the main menu.

  2. Select your version control system from the list.

  3. In the VCS-specific dialog that opens, type your credentials and the repository to check out the application sources from.

Choosing the JavaScript language version

To get reliable and efficient coding assistance, you need to specify the language version that will be used in all JavaScript files of your application by default.

  1. In the Settings/Preferences dialog (Ctrl+Alt+S), choose JavaScript under Languages and Frameworks. The JavaScript page opens.

  2. From the drop-down list, choose one of the supported JavaScript language versions:

Using multiple JavaScript versions

If you are working on an application that uses both ECMAScript 5.1 and a newer version of ECMAScript, or JSX, or Flow, the easiest way is to choose the highest language version for the whole project from the drop-down list on the JavaScript page. For example, if you use ES5.1 and JSX, enable JSX (since it is a superset of ES5.1 and ES6).

To configure different JavaScript language versions for different folders

  1. On the JavaScript page, click Browse button next to the JavaScript language version drop-down list. The JavaScript Language Versions dialog opens.

  2. Click Add and in the dialog that opens select the folder where you need a custom language version. PhpStorm brings you back to the JavaScript Language Versions dialog where the selected folder is shown in the Path field.

  3. From the Language drop-down list, choose the language version for the files in the selected folder. In all the other JavaScript files in the project PhpStorm will use the version chosen on the JavaScript page.

    ws_js_choose_language_version.png

Downloading npm dependencies

Before you start, install Node.js. If your application uses some tools, libraries, or frameworks, download the required packages.

To install a package in an empty project

  • Open the embedded Terminal (Alt+F12) and type npm install <package name> at the command prompt.

If you already have a package.json file in your project

  • Right-click the package.json file in the editor or in the Project tool window and choose Run 'npm install' on the context menu.

Configuring code completion for project dependencies

To provide code completion for project dependencies, PhpStorm automatically creates a node_modules library. In PhpStorm, a library is a file or a set of files whose functions and methods are added to PhpStorm's internal knowledge in addition to the functions and methods that PhpStorm retrieves from the project code that you edit. See Configuring JavaScript Libraries for details and examples.

Viewing parameter hints

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.

Parameter hints in JavaScript

To configure parameter hints

  1. In the Settings/Preferences dialog (Ctrl+Alt+S) box (Ctrl+Alt+S), click General under Editor, then click Appearance. The Appearance page opens.

  2. Click Configure next to the Show parameter name hint checkbox (the checkbox is selected by default).

  3. In the Configure Parameter Name Hints dialog that opens, select the Show name for all arguments checkbox in the Options area.

Auto import in JavaScript

PhpStorm can generate import statements for modules, classes, components, and any other symbols that are exported. If you are using ES6 in your project, PhpStorm can add missing import statements on the fly, when you complete ES6 symbols.

For earlier JavaScript versions or when auto import on completion is disabled, PhpStorm marks the symbol as unresolved and shows a tooltip:
ws_es6_autoimport_off_tooltip.png
On pressing Alt+Enter, PhpStorm displays the suggested quick-fix:
ws_es6_autoimport_off.png
If there's more than one possible source of import, PhpStorm shows a list of suggestions:
ws_js_import_quick_fix_multiple_choices.png

To add ES6 import statements on code completion

  1. In the Settings/Preferences dialog (Ctrl+Alt+S), click General under editor, and then click Auto Import. The Auto Import page opens.

  2. In the TypeScript/JavaScript area, select the Add ES6 imports on code completion checkbox.

PhpStorm can also generate import statements for symbols defined in the project’s dependencies. Autoimport works for symbols from packages that contain TypeScript definition files (like in moment or redux) or sources written as ES modules.

Running JavaScript in browser

  1. In the editor, open the HTML file with the JavaScript reference. This HTML file does not necessarily have to be the one that implements the starting page of the application.

  2. Do one of the following:
    • Choose View | Open in Browser on the main menu or press Alt+F2. Then select the desired browser from the pop-up menu.

    • Hover your mouse pointer over the code to show the browser icons bar: browserIcons Click the icon that indicates the desired browser.

Debugging JavaScript

PhpStorm provides a built-in debugger for your client-side JavaScript code that works with Chrome.
You can also debug your client-side JavaScript in Firefox, version 36 and higher. However it is strongly recommended that you use Chrome or any other browser of the Chrome family. With PhpStorm, you can debug JavaScript applications running on the built-in server, on an external server, or on a remote server. For details, see Debugging JavaScript in Chrome and Debugging JavaScript in Firefox.

Last modified: 18 December 2018