You can download, clone, or fork the full code example from the GitHub repository and update or use it to your liking. This JavaScript calculator tutorial is pretty basic but packs a punch with the amount of functionality offered and such a little amount of code. You can create a file in your favorite text editor (Notepad, Notepad++, Sublime Text, Visual Studio code etc.). If the Enter button is pressed on the keyboard, then the equal = button on the calculator is clicked, solving the equation. const calculator document.querySelector ('form name'calculator'') const btns calculator.querySelectorAll ('input type'button'') Looping over all buttons and then assigning the event handlers based on if constraints isn't really practical. If one of the buttons exists, then it triggers a button click event on the selected button. The next part of our JavaScript calculator is the CSS code to style the calculator container and buttons: body, false) Ī keyup event handler is added to the document object, with a for loop that matches the user input from the keyboard to any of the existing buttons on the calculator. To understand this example, you should have the knowledge of the following JavaScript programming topics: JavaScript if. This could include a numeric value, operator, etc. JavaScript Program to Make a Simple Calculator In this example, you will learn to write a program to make a simple calculator in JavaScript. data-type: The type of the button, used to determine what action should be taken to update the display of the equation.First, we need to figure out how many buttons we are going to need. I've included this because some of the symbols used to perform the calculations are different than their button text counterparts on computers versus how we're used to seeing them in the real world. In our JavaScript calculator, we’ll be using Internal CSS. data-id: The ID of the button, used to perform the calculations.This layout displays the overall calculator container along with the numeric display and buttons, including the numbers, symbols, operations, etc.Įach of the buttons has two data attributes associated with them: Let's get right into the code! The HTMLįirst, let's get the HTML for our calculator layout out of the way: 0 + − × ÷ 7 8 9 = 4 5 6 1 2 3 C 0. My goal was to simplify and lessen the amount of code as much as possible but is proven to be extremely useful and effective. In this tutorial, you'll learn the basics of creating a simple calculator with vanilla JavaScript, CSS, and HTML.
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