How To Use Java Script – JavaScript is a programming language that we can use to make websites interactive. When we search for something on Google or click a link, our website changes – that’s what JavaScript allows us to do.
First, we’ll use Sublime to create an index.html file with the usual boilerplate information, and we’ll also create a quick button in our body tag.
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Then we’ll create a js folder and put a file called script.js in it – this name is traditional. Next, we’ll link this JS file to our code, just like we did for the CSS and Bootstrap framework in the previous tutorial. It will go into our chapter tab.
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Now we have JavaScript! So far, nothing seems to be different, but we are ready to code. Now suppose we want to surprise our friend with a hidden message. When they first load the screen, only the “click here” button will appear, but if they click that button, a hidden message will appear. So first, let’s hide this message and add some CSS to make it hidden in the first place…
Now, when we refresh the page, we see that even though we wrote the element, it is hidden because we set the display property to None.
All we need to do is write JavaScript to pop up a message when the button is clicked, so we’ll go to script.js and write the function. To create a function, we will write the keyword function, followed by the name of the function – here is the detection message. If we needed to add parameters to a function then we would put them between parentheses, but for now we don’t have to worry about that so we won’t put anything inside. Next, we can add the main part of the function – what it actually does when zbulMessage() is called. In our function, we pass the variable document (that is, our HTML document), and then get the element with id hiddenMessage (the paragraph we created earlier). Next, we can access the styles of this element, in other words, it’s CSS, and we set its display property to the value “Block”.
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Now we have the detectMessage function, but it’s not yet bound to the button. Back in our HTML, we’ll add an onclick attribute to our button and give it a value of discoverMessage. It basically says to keep running the detectMessage function when this button is pressed.
We just use JavaScript to manipulate the value of the display property, but this can be used with almost any CSS property. We can use JavaScript to change the color of the image or the background or anything else the user does.
While that sounds cool, CSS manipulation isn’t the only thing JavaScript can do. We could also add a countdown to this holiday so that every time the user clicks the countdown button, the holiday date gets closer. Back in the code, we’ll add a button with ID countDownButton and an onclick action countdown().
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Next, we’ll create a div and place these styles and id attributes from the paragraph on the div to hide the message and countdown.
Moving on to JavaScript, to make the countdown work, we’ll write our own keyword function and name the function countdown. Again, we won’t give it parameters and continue with the implementation of our method. We will create a variable using the var keyword and name it currentVal. Its value will be the text of the element with id countDownButton , which can be retrieved using the innerHTML property. Next, we’ll have another variable called newVal and subtract 1 from the value of currentVal – that’s how we count down! Next, we set the text of countDownButton to the new value, retrieve it using the getElementById function, and set its innerHTML property to newVal.
However, you may notice that sometimes our countdown goes below zero. To avoid this, we can add something called an if statement. Basically, we’ll say the button’s default new value is zero, but if the button’s current value is 1 or greater, then we’ll subtract (count down) 1 and make it the button’s new value. Otherwise, the button value will be null, the default value.
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This is an introduction to JavaScript and how it can make your website interactive. Here, we wrote vanilla JavaScript, which means we didn’t use any extra libraries in our code. Next week, we’ll learn about a JavaScript library called jQuery and how it can make our job a little easier. Then see. RelatedCodeIgniter: Start with a simple example on how to install Express, Node.js framework and set up Socket.io on VPSView
Modern browsers have built-in development tools for working with JavaScript and other web technologies. These tools include a console-like shell interface, as well as tools for inspecting the DOM, debugging, and analyzing network activity.
As part of the JavaScript development process, the console can be used to log information and allow you to interact with web pages by executing JavaScript expressions in the context of the page. Essentially, the console enables you to write, manage, and monitor JavaScript on demand.
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This tutorial will discuss how to use the console and JavaScript in the context of a browser, and will provide an overview of other built-in development tools you can use during web development.
Note: After this tutorial, you may notice that your browser and console look different from the example in the image. Browsers are updated frequently and often include new tools and possibly new visual styles. These updates should not affect your ability to use the console in your browser.
Most modern web browsers that support standards-based HTML and XHTML allow you to access the developer console, where you can use JavaScript in a terminal shell-like interface. This section describes how to access the console in Firefox and Chrome.
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To open the web console in FireFox, go to the menu ☰ in the upper right corner next to the address bar.
To open the JavaScript console in Chrome, you can go to the menu in the upper-right corner of the browser window, which is marked with three vertical dots. From there you can select More Tools, then Developer Tools.
This will open a panel where you can click Console on the top menu bar to bring up the JavaScript console (if not already highlighted):
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Instead of having the popup alert click through, you can use JavaScript by logging into the console.
If you want to change the command you entered in the console, you can type the up arrow (↑) key on your keyboard to go back to the previous command. This will allow you to modify the order and resubmit.
The JavaScript console gives you a space to test your JavaScript code in real time, allowing you to use an environment similar to a terminal shell interface.
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You can work in the context of an HTML file or in a dynamically rendered page in the console. This allows you to experiment with JavaScript code in the context of existing HTML, CSS and JavaScript.
Note that after reloading the page after changing it in the console, it will return to the state it was in before the document was changed. Be sure to save any changes you want to save elsewhere.
File to learn how to modify it using the console. Create in your favorite text editor
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If you save the HTML file above and load it into a browser of your choice, you will see a blank page with the title:
Open the console and start using JavaScript to modify the page. Start using JavaScript to insert headings into HTML.
After creating this element, you can proceed to create text nodes that can be added to paragraphs:
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The console gives you experimentation with modifying HTML pages, but it’s important to remember that when you’re working on the console, you’re not modifying the HTML document itself. After reloading the page, it reverts to a blank document.
Depending on the browser development tools you use, there are other tools you can use to help you with your web development workflow.
Every time a webpage loads, the browser it’s in creates the Document Object Model, or DOM, for that page.
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The DOM is a tree of objects and displays HTML elements in a hierarchical view. The DOM tree is available in Firefox’s Inspector panel or Chrome’s Elements panel.
These tools allow you to inspect and edit DOM elements, and also allow you to identify HTML associated with specific page aspects. DOM can tell you a piece of text or