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.

If the Enter button is pressed on the keyboard, then the equal = button on the calculator is clicked, solving the equation. 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. Its one of the robust, feature-rich online compilers for NodeJS language,running on the latest LTS version NodeJS 16.14.2. This could include a numeric value, operator, etc. Write, Run & Share NodeJS code online using OneCompilers NodeJS online compiler for free.

data-type: The type of the button, used to determine what action should be taken to update the display of the equation.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. data-id: The ID of the button, used to perform the calculations.To obtain a modulo in JavaScript, in place of n d, use ( (n d) + d) d. 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: For two values of the same sign, the two are equivalent, but when the operands are of different signs, the modulo result always has the same sign as the divisor, while the remainder has the same sign as the dividend, which can make them differ by one unit of d. 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. returns the change and subtracts from this.moneyĬonst change = cashRegister.returnChange(3.26, 100)Īs for the algorithm for returning change, you can watch some videos on change making problem in javascript on youtube.In this tutorial, you'll learn the basics of creating a simple calculator with vanilla JavaScript, CSS, and HTML. Function checkCashRegister(price, cash, cid)

Javascript calculator