![]() ![]() The code block collapses to just the first line, followed by an ellipsis (. ![]() Or, if you're a keyboard user, place the cursor anywhere in the constructor code and press Ctrl+ M, Ctrl+ M. Choose the small gray box with the minus sign inside it in the margin of the first line of a function. If you need to unclutter your view of some regions of code, you can collapse it. The JavaScript comment characters // are added to the beginning of each selected line to comment out the code. If you prefer to use the keyboard, press Ctrl+ K, Ctrl+ C. Select one or more lines of code in the editor and then choose the Comment out the selected lines button on the toolbar. In this section, we'll comment out some code. For example, you can toggle IntelliSense completion mode ( IntelliSense is a coding aid that displays a list of matching methods, amongst other things), increase or decrease a line indent, or comment out code that you don't want to compile. The toolbar, which is the row of buttons under the menu bar in Visual Studio, can help make you more productive as you code. You can fix this code by adding the comma ( ,) before "data".įor additional information on linting, see Linting. In the lower pane, you can click the Error List tab to see the warning and description along with the filename and line number. The last line of this message tells you that the language service expected a comma ( ,). In the following code, you see green syntax highlighting (green squiggles) on the expression. The linting options point you to the global ESLint configuration file. If you need to set options for syntax checking in the editor, select Tools > Options > JavaScript/TypeScript > Linting. The language service uses ESLint to provide syntax checking and linting. If you are interested in AngularJS programming in Visual Studio, you can use the AngularJS language service extension for Visual Studio to get IntelliSense. For more details about how IntelliSense information is acquired, see JavaScript IntelliSense. For most common JavaScript libraries, d.ts files are automatically acquired. To provide IntelliSense information, the language service can use TypeScript d.ts files and JSDoc comments. IntelliSense can also show you information about types when you hover over programming elements. If you put your cursor after the data string in the following code and type get, IntelliSense will show you functions defined earlier in the code or defined in a third-party library that you've added to your project. You can also use IntelliSense to complete a word after you type enough characters to disambiguate it. In the following code, when you type Router(), you see the argument types that you can pass. It can show you information about available members of a type, or parameter details for different overloads of a method. IntelliSense is an invaluable resource when you're coding. The new file gets added to your project and it opens in the editor. In the New File dialog box, under the General category, choose the file type that you want to add, such as JavaScript File, and then choose Open. If you don't see all the item templates, choose Show All Templates, and then choose the item template. With your project open in Visual Studio, right-click on a folder or your project node in Solution Explorer (right pane), and choose Add > New Item. You can use the IDE to add new files to your project. If you aren't, we suggest you look at a tutorial such as Create a Node.js and Express app first. This article assumes you're already familiar with JavaScript development. For more information in getting the language service for TypeScript, see TypeScript support. Depending on the type of app development you're doing, you may need to install the Node.js development workload with Visual Studio. If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.
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