The function is getting the number pressed by using this keyword. If it is not 0, then it will add the number pressed to the outputLower. If it is 0, then it will replace the 0 with the number pressed. It will check if the outputLower (expression) is 0 or not. The above function will be called when any number button is pressed. Now create a function to input the numbers // function to get number input 'outputUpper' is a place where the expression given by the user will be shown in small size just above the result so that the user can see both their expression and result at the same time. 'outputLower' is a place where the expression given by the user and the output of the result will be shown. Let outputLower = document.querySelector('#lower') lower output is for showing the result Let outputUpper = document.querySelector('#upper') upper output is for showing the expression Select both of them using the querySelector method. In the HTML part, you can see there are 2 output elements. Let's now write javascript code for the calculator. Now, we need to create the JavaScript code to make the calculator work. We have completed the design of the calculator. Here is the complete HTML code of the calculator. Also, add font-awesome icons to the HTML file. With different orders, we can create different layouts of the calculator.įinally, connect the CSS and Javascript files to the HTML file. In the above code, you can see the buttons are in a certain order because we want our buttons to be in specific places. Also, attach onclick event to all these buttons with a javascript function. The input element will contain all kinds of input buttons we can have like, numbers, operators, clear, brackets, etc. The first one is called upper output, which displays the expression, and the second one is called lower output, which displays the result. The output element will further contain 2 pre elements. Now, inside the calculator container, create 2 div elements one to display the result and another to display the input. This div element will be our calculator container. To start with first create a container (a div element with a class container) and inside it create another div element with a class calculator. So, let's start creating the structure of our calculator. You can always modify the structure later. When you create the structure of anything in HTML, the structure need not be perfect in the first attempt. HTML - Creating the structure of the calculator First, the structure of the calculator will be created (using HTML), then we will style it (using CSS), and finally, we will create the logic of the calculator (using JavaScript).ġ. We will start building our calculator step by step. JavaScript (script.js) - To create the logic of the calculator.CSS (style.css) - To style the calculator.HTML (index.html) - To create the structure of the calculator.Let's start creating our simple calculator. Test the appĪ simple calculator is used to perform simple mathematical calculations like addition, subtraction, multiplication, and division. NumBtn.Before proceeding further let's have a look at what we are going to build. I realized I need to somehow store the result of the operations and then use it for the calculations but don't know how, it doesn't sound hard to fix but can't solve it.Ĭonst display = document.querySelector(".display") Ĭonst numbers = document.querySelectorAll(".number") Ĭonst operators = document.querySelectorAll(".operator") It can't do multiple operations, it only works if you press the "=" button after each operation. I'm currently creating a vanilla JS Calculator and I have some issues.Įverything is working fine, except I can't do multiple calculations.
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