How To Make A Java Script – JavaScript is a programming language that can be used to make websites interactive. When we search for something on Google or click on a link, our website changes – JavaScript allows us to.
First, we’ll use Sublime to create an index.html file with the usual template information, and here we’ll create a shortcut button on our body tag.
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Then we create a js folder and put a file called script.js in it – whatever the name is. In later lessons, we’ll link this JS file to our code, just like the CSS and bootstrap frameworks. It goes into our header.
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Now we have JavaScript! Nothing changes for now, but we’ve built and coded. Now suppose we want to surprise a friend with a hidden message. When they first load the screen, only the click here button appears, but when they click the button, a hidden message opens. So let’s create this hidden information first and add the CSS first.
Now, after refreshing the page we can see that even though we have written this element in the code, it is hidden because we have not set the attribute to none.
What we need to do is write JavaScript so that when we press the button a message will appear, so we’ll go into script.js and write a function. To create a function, we write the keyword function followed by the name of the function—here, find. If we need to add parameters to the function, we put them in parentheses, but we don’t need to worry about that now, so we don’t add anything inside. Then we can add the body of our function – what it actually does when we call detectMessage(). Inside our function, we access the file variable (our HTML file) and then return an element with id hiddenMessage (the paragraph we created earlier). Next, we’ll access the style of this element, so to speak, it’s CSS, and set its display property to “block”.
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Now we have the detectMessage function, but it’s not connected to the button yet. Back in the HTML, we’ll add an onclick attribute to our button and set it to detect Message. Basically, it tells you to turn off the Detect Message feature when the button is clicked.
We’ve only used JavaScript to control the value of the display property, but this can work for almost any CSS property. We can use JavaScript to change the image, background color, or anything else based on what the user does.
While this may sound cool, manipulating CSS isn’t the only thing JavaScript can do. We can also add a countdown to this holiday so that every time the user clicks the countdown button, the holiday will get closer. Going back to the code, we’ll add a button with an ID of countDownButton and an onclick countDown() action.
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Next, we’ll create a div and place these style and id attributes in the paragraph div so that the info and countdown are hidden.
Let’s move to JavaScript for counting and write our keyword function and call it countDown. Again, we don’t provide it with parameters and move on to the implementation of our method. Create a variable with the var keyword and call it current Val. Its value is the text of the element with ID countDownButton , which can be accessed via the internalHTML attribute. Then we’ll have another variable called newVal and assign it the current value of Val minus 1 – that’s how we calculate! Next, we use the GetElementById function to assign a new value to the text of the countDownButton by setting the inner HTML property to newVal.
However, you may notice that sometimes our numbers are less than zero. To prevent this, we can add a so-called if statement. Normally, we say that the new value of the button is zero, but if the current value of the button is 1 or greater, then we subtract one (count down) and leave it as the new value of the button. Otherwise, the key value will be invalid.
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This is an introduction to JavaScript and how it can make your websites more interactive. Here we wrote vanilla JavaScript, meaning we didn’t use any additional libraries in our code. Next week, we’ll learn about a JavaScript library called jQuery and how it makes things easier. Node.js is a platform for building fast and scalable server applications using JavaScript. A Node.js runtime environment, npm is a package manager for Node.js modules.
Visual Studio supports JavaScript and TypeScript languages, as well as Node.js solutions. However, to run a Node.js application, you need to install the Node.js runtime on your computer.
To begin this step, install Node.js on your platform. The Node package manager is included in the Node.js distribution. You should open a new terminal (command line) for you
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Linux: There are dedicated Node.js packages for different Linux variants. Use the Node.js installation package manager to find the appropriate Node.js package and installation instructions for your Linux version. Windows Subsystem for Linux: If you’re on Windows, WSL Node.js. A good way to develop You can install Node.js in a Linux environment by running a Linux distribution on Windows. Combined with the WSL extension, you get full VS editing and debugging support when working in a WSL environment. To learn more, visit Work at WSL or view jobs at WSL. Hello world
Tip: You can open files or folders directly from the command line. Period ‘.’ Displays the current folder so VS starts and opens the hello folder.
File extension, VS interprets the file as JavaScript and evaluates the content using the JavaScript language service. For more information about JavaScript support, see the VS JavaScript language topic.
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After testing IntelliSense, undo the original additional changes above and save the file (⌘S (Windows, Linux Ctrl + S)).
VS has a built-in terminal where you can run shell commands. You can run Node.js directly from there and avoid switching from VS when running command line tools.
View > Terminal (⌃` (Windows, Linux Ctrl + `) backspace) opens the installed terminal, so you can run
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For this step, you can run command-line tools using an external terminal or the built-in VS terminal.
As mentioned in the introduction, VS provides a debugger for Node.js applications. Let’s unpack our simple Hello World application.
, place the editor cursor on the first line and press F9 or click on the left side of the editor next to the line number. A red circle appears in the canal.
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You can now run Hello World by clicking the green toolbar arrow or by pressing F5. You get to your breakpoint, see a simple program, and step through. Notice that VS shows a different colored status bar and that it is in debug mode and DEBUG CONSOLE is displayed.
Now that you’ve seen VS in action, the next section will show you how to use VS with a complete Node.js web application.
Attention We worked with the Hello World example, so exit this folder before building the Express application. You can delete the “Hello” folder if you want, as it is not needed for other paths. application
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Express is a very popular tool for building and running Node.js applications. You can deploy (build) a new Express application using the Express Generator tool. Express Generator comes as an npm module and is installed via the npm command line
Tip: To check if npm is installed correctly on your machine, type npm -help in the terminal and you will see the usage file.
To install all app dependencies (also available as npm modules), move them to the new folder and run them
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Attention If you installed Express Generator and built the app using VS’s integrated terminal, you can open the myExpressApp folder from within VS’s runtime using the File > Open Folder command.
The Node.js and Express documentation explains how to build rich applications using the platform and framework. Visual Studio makes you more efficient in developing such applications by providing editing and navigation capabilities.
Is a string. More interestingly, Node.js. You can get full IntelliSense on the base. For example, you can request
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) to provide VS with metadata about the JavaScript framework that your application uses. Type declarations are written in TypeScript, and they can represent data types
