How To Start Using Javascript – HTML can’t do math, it can’t determine if someone filled out a form correctly. HTML simply allows people to read text, watch videos, view images, and click on links. You need JavaScript to add intelligence to your web pages so they can respond to your site visitors. Thus, JavaScript allows you to make your websites more attractive, efficient and useful.
JavaScript is more complex than HTML or CSS; The main goal of this book is to help you think more like a programmer. A JavaScript program has such symbols ([ ] ; , () !=) and many unknown words (var, null, else if). We can say that learning a programming language is very similar to learning another language. You have to learn new words and learn to connect them. About a computer program?
How To Start Using Javascript
Adding JavaScript to a web page means you are writing a computer program. Many JavaScript programs are much simpler than those used to read emails or create web pages. But while JavaScript programs that are also scripts are simpler and shorter and share the same properties as more complex programs.
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If you want to display a welcome message using the website visitor’s name: “Welcome, John Doe!”, you need to do a few things:
When you want to create a JavaScript program, you must define the steps necessary to achieve your goal. After learning the steps, you’ll translate your ideas into programming code – the words and symbols that make the web browser behave the way you want.
Web browsers can understand HTML and CSS and convert these languages into on-screen displays. The web browser expects HTML, so you must explicitly tell the browser when JavaScript arrives using the tag.
After opening the desired console (such as Node.js), simply attach the script to the web page. To bind Javascript to an HTML page, you need to use the element, which helps us insert Javascript programs anywhere in the HTML document. For example:
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Let’s look at the opening and closing tags. If you want to add a script to your page, you must start by entering tags that include the script itself or a link to an external file that contains the scripts. In many cases, you’ll place tags in the of the page to keep your JavaScript code organized intelligently in one part of the web page.
The element has some attributes that we don’t use very often today. But we can still find them in the old code:
Old HTML: The HTML4 type requires a script to exist. There used to be type=”text/javascript”, which is not necessary today. Additionally, the modern HTML standard has completely changed the meaning of this attribute. Today we can use it for JavaScript modules. But we will talk about modules later, because this is an advanced topic.
The attribute presented above was intended to display the language of writing. But since JavaScript is the default language, you don’t need to use it.
Start Using Javascript
As mentioned above, using the tag allows you to add JavaScript to a single web page. But you’ll also need to create scripts that you want to share with all the pages on your site. But simply copying and pasting the same JavaScript code on every page is not a good idea, especially when you have a site with hundreds of pages.
In short, we use external scripts when we have a lot of JavaScript code. In this way we achieve code reuse because a JavaScript file can be used in several HTML pages. The JavaScript file extension is .js. If we want to use an external script, we must put the script file name in the src (source) attribute of the tag:
Is an absolute path to a script that can also provide some relative path from the same page. For example, src=”Script.js” means the file “Script.js”.
If src is set, the script content will be ignored. This means that a single tag cannot have the src attribute and the code inside it. It just won’t work:
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Or with normal code. Only then can we split this example into two scripts to work with:
The script from the previous section appeared in the middle of your monitor. But if you want to print the message directly on the web page using JavaScript, you can use the built-in JavaScript command:
Many web developers prefer to use Google’s Chrome browser. Its DevTools attribute offers you several ways to troubleshoot and balance HTML, CSS, and JavaScript issues. The JavaScript console is a great place to track bugs and errors in your code. It also identifies the line of your code where each error occurred.
Click the Customize menu button to open the JavaScript console and select Tools → JavaScript Console. Or use the keyboard shortcut Ctrl+Shift+J (Windows) or ⌘-Option-J (Mac), etc.
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Ready to challenge what you’ve learned? Take our interactive quizzes for deeper understanding and improve your knowledge in a fun way. Visual Studio includes built-in IntelliSense JavaScript, debugging, formatting, navigation, refactoring, and many other advanced language features.
Most of these features work well, although some may require basic setup for the best experience. This page summarizes the JavaScript features included in VS. VS Marketplace extensions can augment or replace most of these built-in features. For a more detailed guide on how these features work and how they can be configured, see Working with JavaScript.
IntelliSense shows you smart signing, information, and completion information so you can type faster and more correctly.
See Working with JavaScript to learn about VS JavaScript IntelliSense, how to configure it, and help you troubleshoot common IntelliSense problems.
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Tip: To check if a JavaScript file is part of a JavaScript project, simply open the file in VS and run the JavaScript command: Go to Project Settings. This command opens jsconfig.json, which points to a JavaScript file. A message will appear if the file is not part of any jsconfig.json project. fragments
There are many extensions that provide additional snippets, including snippets for popular frameworks like Redux or Angular. You can define fragments yourself.
Tip: To disable snippet suggestions, set editor.snippetSuggestions to “none” in the configuration file. The editor.snippetSuggestions parameter also allows you to change the appearance of snippets in suggestions: top (“top”), bottom (“bottom”), or inserted alphabetically (“inline”). The default is “online”. JSDoc support
VS understands many standard JSDoc annotations and uses them to provide rich IntelliSense. Optionally, you can even use the type information from JSDoc comments to verify your JavaScript.
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The keyboard shortcut ⌘K ⌘I (Windows, Linux Ctrl+K Ctrl+I ) displays this motion information at the current cursor position.
When writing calls to JavaScript functions, VS displays information about the function signature and highlights the parameter that is currently being executed:
Automatic import speeds up coding by suggesting variables in your project and its dependencies. When you choose one of these suggestions, VS automatically adds an import to the top of the file.
Start typing to see suggestions for all the JavaScript symbols available in your current project. Automatic import suggestions show where they will be imported from:
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Tip: VS tries to use the best import style. You can explicitly set the preferred quote style and path style for imports you add with the javascript.preferences.quoteStyle and javascript.preferences.importModuleSpecifier parameters. Format
You can navigate the search for symbols using the Symbol (⇧⌘P (Windows, Linux Ctrl+Shift+P)) command from the command palette.
VS includes some useful refactorings for JavaScript, such as the Extract function and the Extract constant. Simply select the source you want to extract, then click the slot bulb or press (⌘. (Windows, Linux Ctrl+. )) to see the available refactorers.
) is a default enabled setting that enables nearest quick online repair from ⌘. (Windows, Linux Ctrl+. ) (Command ID
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The command highlights the source to be reconstructed or corrected. Normal actions and incorrect refactoring can still be triggered at the cursor location.
You can quickly remove this unused one by hovering over it and activating the quick repair command (⌘. (Windows, Linux Ctrl+. )) or by clicking the light bulb.
You can run Import Organizer from the Source Action context menu or with the keyboard shortcut ⇧⌥O (Windows, Linux Shift+Alt+O).
The parameter allows you to configure a set of actions that will be performed when the file is saved. For example, you can enable import preparation by setting to save:
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GitHub Copilot is an AI-powered completion tool that helps you write faster and smarter. You can use the GitHub Copilot extension to build VS or learn how to build it.
GitHub Copilot offers suggestions across multiple languages and frameworks, and works particularly well for Python, JavaScript, TypeScript, Ruby, Go, C#, and C++.
Once the Copilot extension is installed and enabled, you
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