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You can reload the page to see if the page depends on JavaScript when it loads. This happens during response behavior in games, clicking buttons, or entering data on forms; With dynamic styling; With animation and more. This article helps you get started with JavaScript and expands your understanding of what’s possible.
JavaScript is a powerful programming language that can add interactivity to a website. It was invented by Brandon H.
JavaScript is versatile and beginner-friendly. With more experience, you’ll be able to create games, animated 2D and 3D graphics, comprehensive database-driven applications, and more.
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JavaScript itself is relatively compact, but very flexible. they’ve written a number of tools on top of the underlying JavaScript language, opening up a wide range of functionality with minimal effort. They include:
It is beyond the scope of this article, as a light introduction to JavaScript, to detail how the core JavaScript language differs from the tools listed above. You can learn more in MDN’s JavaScript learning area, as well as elsewhere on MDN.
The section below introduces some aspects of the core language and also gives you a chance to play with some features of the browser API. Enjoy!
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JavaScript is one of the most advanced web technologies. As your JavaScript skills improve, your websites will enter a new dimension of power and creativity.
However, getting comfortable with JavaScript is more difficult than getting comfortable with HTML and CSS. You may have to start small and work your way up slowly. To begin, let’s review how to add JavaScript to your page to create a
Warning: If you haven’t followed the rest of our tutorial, download this example code and use it as a starting point.
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Note: The reason for placing the element at the bottom of the HTML file in the directive (above) is that the browser reads the code in the order it appears in the file.
If JavaScript is loaded first and needs to affect HTML that hasn’t been loaded yet, problems can occur. Placing JavaScript at the bottom of an HTML page is one way to handle this dependency. To learn more about alternative methods, see Script Loading Strategies.
Using JavaScript. You did this by using the querySelector() function to get the reference to your header and then storing it in a variable.
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. This is similar to what we did using CSS selectors. When you want to do something with an item, you must first select it.
Note: Both of the properties you use in this exercise are part of the Document Object Model (DOM) API, which is capable of manipulating documents.
To better understand how JavaScript works, let’s explain the main features of the language. It should be noted that these features are common to all programming languages. If you know these basics, coding in other languages will also start.
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Warning: In this article, try typing the sample lines of code into your JavaScript console to see what happens. For more details about JavaScript consoles, explore Browser Tools.
Variables are containers that hold values. You start by declaring a variable with the let keyword, followed by the name you give the variable:
A period at the end of a line indicates where the statement ends. This is only required when you need to separate statements on a single line. However, some people think it’s good practice to put a comma at the end of every statement. There are other rules about when you should and shouldn’t use a comma. See your guide to commas in JavaScript for more details.
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You can call a variable almost anything, but there are some limitations. (See this section on naming conventions.) If you’re not sure, you can check your variable name to see if it’s correct.
It is a sequence of text called a string. To indicate that the value is a string, enclose it in single quotes.
It could be anything. Everything in JavaScript is an object and can be stored in a variable. Keep that in mind as you study.
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So why do we need variables? Variables are essential to doing anything interesting in programming. If the values can’t be changed, you can’t activate anything, like customize the welcome message or change the image displayed in the gallery.
Comments are pieces of text that can be included in code. The browser ignores text marked as a comment. You can write comments in JavaScript like you can in CSS.
If there are no line breaks in your comment, there is an option to put it behind two backslashes, like this:
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Is a mathematical symbol that returns a result based on two values (or variables). In the following table you can see some simple operators with some examples to try in the JavaScript console.
Etc. When used with the Equality operator, the negation operator checks whether two values exist
There are many more carriers to explore, but that’s enough for now. For a complete list, see Expressions and Operators.
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Note: Mixing data types when performing calculations can lead to strange results. Be careful that you reference your variables correctly and get the results you expect. Enter e.g.
On your console. Why are you not getting the result you expected? Because quotes turn numbers into a string, you end up concatenating strings instead of adding numbers. If you enter
Conditions are code structures used to test whether an expression evaluates to true. is a very common form of conditional.
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, the first block of code is executed. If the comparison is not valid, another block of code after –
Functions are a way of packaging functionality that you want to reuse. It is possible to define the body of the code as a function that is executed when your code calls the function name. This is a good alternative to writing the same code over and over again. You’ve already seen some uses of the functions. For example:
– This is possibly a function. Functions often take arguments; the bits of data they need to do their jobs. Arguments are enclosed in parentheses separated by commas if there are multiple arguments.
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The function displays a popup box inside the browser window, but we need to pass a string as an argument to tell the function which message to display.
You can also define your own functions. In the next example, we create a simple function that takes two numbers as arguments and multiplies them:
The variable is outside the function, so it is available for use. This is important because variables defined inside functions are only accessible inside those functions. This is called a variable frame. (Read more about variable scope.)
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Event handlers are required for real interaction on the site. These are code structures that listen for browser activity and execute code in response. The most obvious example is handling the click event, which is fired by the browser when you click the mouse on an object. To display it, type the following in your console, then click Current Web Page:
There are several ways to attach an event handler to an element. Here we select the element. Then we call its addEventListener() function, passing in the name of the event to listen for (
Because it has no name. There is an alternative way of writing anonymous functions that we call
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File — the bit you first saw in Hello World. added during Example – and save the empty file. If you don’t, the existing code will conflict with the new code you’re about to add.
In this section, you’ll learn how to use JavaScript and DOM API functions for substitution.