simple calculator in html without css

If the calculator shows a non-zero number, we want to append the clicked key to the displayed number. Creating a Memory Card Game with HTML, CSS, and JavaScript, Create parallax scrolling effect with vanilla Javascript, Create a drawing app using JavaScript and canvas. Congratulations you have created a beautiful calculator in HTML and CSS! If it is, we dont perform a calculation. I reserve We accomplish this by creating thousands of videos, articles, and interactive coding lessons - all freely available to the public. Third, if Tim hits another operator key after hitting the first operator key, the first operator key should be released. Find centralized, trusted content and collaborate around the technologies you use most. (Note: some developers swear by curly brackets, though). Here is what you can do to flag javascriptacademy: javascriptacademy consistently posts content that violates DEV Community's This really depends on where youre putting the calculator and what else is on the page. Although we can calculate a value when the operator key is clicked for a second time, we have also introduced a bug at this point additional clicks on the operator key calculates a value when it shouldnt. Designed and created by Lauralee Flores. A: To make the calculator responsive, you can use CSS media queries to adjust the layout and font sizes based on the screen size. Well use them in the refactor. He enjoys writing about diverse If the calculator shows 0, we want to replace the calculators display with the clicked key. case 'X': Minimally, you need to know these things: I urge you to try and build the calculator yourself before following the lesson. Eventually, we want the code to look something like this: That means we need to create a calculate function. We can use the grid-gap property as a shorthand for both grid-column-gap and grid-row-gap like this: grid-gap: 20px 20px. At this point, the required variables remain the same as before: Heres the code we wrote for operator keys. I hope you guys will like it.. I'm a frontend developer and JavaScript enthusiast. Instead of display.textContent = 'some value', we want to return each value so we can use it later. Note that this gutter is not present along the edge of the grid container. imho, no beginner should ever prefer

over ever! Apply the missing two sides of the borders for every button: For the button we'll set borders, font-size and 100px of line height to center it vertically, and set text-align: center to center the button labels horizontally. document.getElementById('result').value=r; you should replace "innerHTML" to "value" in your code. The result gets updated to the display. To gather the buttons we can select them by document.getElementsByClassName('button'), but this function gives back a NodeCollection instead of an array so we have to convert it to an array using Array.from(). How to add event listeners with the event delegation pattern, The class for pressing/depressing operators. data-previous-key-type is not complete yet. cross-platform productivity timer for the command line. However, some keys are different. For this project we will use the BEM naming methodology. The first thing we need to do is make sure the calculator doesn't go too wide. :). high quality tutorials at a faster rate. VS "I don't like it raining.". In your CSS, add the grid-row-start property to the .equals-sign selector: We have specified that the Equal sign be moved to the second grid line on the row. Before you jump into the Javascript side of things, consider the HTML and CSS. A: Yes, you can enhance the calculator by adding more buttons and extending the JavaScript logic. How To Make a Calculator Using Only HTML and CSS We will use these wrappers to position our calculator on the page. If the previousKeyType is an operator, we want to replace the displayed number with clicked number. The head section of the html file will be declared as follows When the calculator is in its default state, AC should be shown. Simple Calculator using Javascript. At this point, the code we created together is quite confusing. To do this we want to make sure they are the same height and width. The text should be right align, because this is how most calculator displays work. HTML Calculator - GeeksforGeeks Heres what were left with if we remove everything that concerns display.textContent. It defaults to 0. To do this, well simply wrap all these keys together in an HTML element. You learned that we should reduce reassignments as much as possible. 1) Assign to value, not innerHTML, when referring to an input element. I might not use capital letters. We will look at a few different designs and how to create each one. It should span four rows but it's not doing that right now because we limited the height (aka the block-size) to 60px. The other thing that is slightly strange is that the output and the background behind the buttons are different colors. Just change the color of the keys to be the same as the background. That concludes my tutorial. Is it possible for rockets to exist in a world that is only in the early stages of developing jet aircraft? Heres what the event listener looks like at the end: You can grab the source code for the refactor part through this link (scroll down and enter your email address in the box, and Ill send the source codes right to your mailbox). Are you sure you want to hide this comment? If you do so, youll get code that looks like this: Here, createResultString is a pure function that returns what needs to be displayed on the calculator. !#abdusSabur #Calculator #withSourceCode Hi If its not clear, we look for the clear button and change its textContent. CSS Grid is a new way of defining the structure of a webpage. Why do I get different sorting for the same query on the same data in two identical MariaDB instances? Lets go through this together, step by step, starting with number keys. It helps developers create complex layouts on the web easily without resulting to old methods such as floats or complicated frameworks which introduced all sorts of problems. This draws a grid overlay around the grid container to help you visualise the layout. And that makes sense because there is CSS to style a table element (the first bit of code to copy and paste), but no HTML code that exists to define that table. updateCalculatorState is a function that changes the calculator's visual appearance and custom attributes. You should not use eval in user facing applications, because it can be abused and external code can be run with it. We wrote the following code to handle the clear key. You can also extend the functionality by adding more buttons or advanced operations. With that, lets begin by understanding how a calculator works. In this case, lets start with calculate. We can use this knowledge to prevent the equals from calculating. You can support the Freshman blog with a one-time or Fifth, after the operator key calculates a number, if Tim hits on a number, followed by another operator, the operator should continue with the calculation, like this: 8 - 1 = 7, 7 - 2 = 5, 5 - 3 = 2. How to Build a Simple Calculator Using HTML, CSS, and JavaScript - MUO break; But what I would really like is for x to be displayed and to act as a * operator, Hello, Not the answer you're looking for? Now to the fun part. Now our calculator looks good to go. Grid lines are the dividing lines between the columns and the rows. But I would definitely use an apostropheand probably a period. The direct descendants of the grid container are known as grid items. Look at what this one small change has on the calculator: First, lets differentiate the operators from the numbers. sports, We want the equal button to stand out so, we'll set a blue background color and white text to it. Fourth, if Tim hits a decimal key or a number key after the calculator key, the display should be replaced with 0. or the new number respectively. Create a simple calculator using HTML, CSS, JavaScript Next, lets say Mary continues her calculation by hitting an operator key. Updated on Nov 4, 2021. Things to fix: We need to setup the .calculator-keys container to use Grid layout: Any element that has its display property set to grid is known as a grid container. Additionally, it'll be easy to read through and understand your stylesheet. I used this: Get ready to learn a little HTML, CSS, and design that you will be able to take with you as you work on this and other projects in the future. We also want to make sure to add styles that give the correct feedback youd expect for a calculator. Although not the result we are looking for, this is a good start. First, if Tim hits a key (any key except clear), AC should be changed to CE. At the bottom of our body I included the index.js script that we will create later. For the display we set a fixed height, and to center the text vertically we need to set the line-height to the exact same amount. CSS styles are used to apply styles on the calculator and JavaScript is used to add the calculation functionality. Its good practice, because youll train yourself to think like a developer. Step 1: We will create a folder anywhere in the computer, which will have three files calc.html, calc.css, and calc.js Step 2: Then we'll open 'calc.html' in text editor like Notepad, Notepad++, Sublime Text etc. It is easy to design, build, and style using a few lines of HTML and CSS code. Here's what needs to be copied: When copying the code into createResultString, make sure you return values for every possible scenario: Next, we want to reduce reassignments. We set also operator to subtract. If you're not familiar After they click the subtract operator, we set firstValue to 99. I checked out the github repo and the style.css file was 0 bytes. The introduction of Grid provides a system of laying out webpages that is native to web browsers and even more powerful than what you can achieve with CSS Frameworks such as Bootstrap. There is all the HTML Code for the Calculator Project. A better way is to split the code into pure and impure functions. First, nothing should happen if Tim hits the equals key before any operator keys. It is easy to design, build, and style using a few lines of HTML and CSS code. Here, instead of just checking if the previousKeyType is operator, we also need to check if its calculate. Great job Adam! code of conduct because it is harassing, offensive or spammy. You can include trigonometric functions, exponentiation, or any other operations you need. I hope it has helped you learn the basics of CSS Grid and how you can use it to build layouts on the web. The properties to use are grid-row-start, grid-row-end, grid-column-start and grid-column end. You can perform basic calculations, clear the display, and get the result with a single click. You have successfully built a simple calculator using HTML and CSS. Based on these class names we can now style the calculator. Second, if Tim hits a number, followed by an operator, followed by a equals, the calculator should calculate the result such that: We have already taken this weird input into account. Lets consider what the average person would do when they pick up a calculator. Basic Calculator Styles. The next BEM element is the calculator__keys. Not only do you now understand the CSS behind creating the calculator but you are also equipped with some design ideas for future projects. Simple calculator in HTML and JavaScript - Stack Overflow We will need to lay these out separately from the main calculator structure. Once we have the three values we need, we can perform a calculation. Before you attempt follow through the lesson, please make sure you have a decent command of JavaScript. Right after they click equals, but before the calculation, we set secondValue as displayedNum. How to insert spaces/tabs in text using HTML/CSS? This tutorial describes how to design a calculator using HTML and CSS. Youll probably get lost if you try to read the code on your own. We can do this by setting a padding on .calculator-keys. It doesnt help, because youre merely splitting up blocks of code. We will also need a key to clear the output. complete guide and cheatsheet. One way to do this is through a custom attribute. If you did, you might love Learn JavaScripta course where I show you how to build 20 components, step by step, like how we built this calculator today. The next few styles we will add are for design reasons and are completely optional. Asking for help, clarification, or responding to other answers. Templates let you quickly answer FAQs or store snippets for re-use. How to speed up hiding thousands of objects. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Stellar Photos Hi-res images in your browser tabs. You can create a file in your favorite text editor (Notepad, Notepad++, Sublime Text, Visual Studio code etc.). the Pomodoro Technique, a time management method developed by Francesco In Germany, does an academic position after PhD have an age limit? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. and The solve () function is evaluating the result with the math.evaluate () and display the final answer to the input field with id . Add the following styles below the reset to absolutely center the calculator on the page and give it a border and fixed width. Create a calulator in javascript - Tutorial by 10code.dev. Let's create the index.js file. Well focus on the JavaScript you need to writehow to think about building the calculator, how to write the code, and eventually, how to clean up your code. How to create a basic calculator using HTML, CSS and JavaScript Built on GatsbyJS. You'll learn about event handling, and DOM manipulations throughout the project. We can use displayedNum directly in the calculate function. How to build an HTML calculator app from scratch using JavaScript Top 10 Projects For Beginners To Practice HTML and CSS Skills. At this point, the displayed number gets updated to 1, but our firstValue, operator and secondValue remain unchanged. With a form, it could work even without JS, by submitting value click after click. Depending on where youre going to be placing your calculator, you may want to use some semantic HTML elements like

to wrap your calculator. For further actions, you may consider blocking this person and/or reporting abuse. You will be notified via email once the article is available for improvement. In this case, another general

element. We need this because we will replace the display.textContent with the value returned from createResultString. When you try, you think, and thatll help you absorb the lesson in double quick time). Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Readers like you help support MUO. That means the createResultString function needs three variableskey, displayedNum and calculator.dataset. At this point, the displayed number gets updated to 1, but our firstValue, operator and secondValue remain unchanged. Open your favorite code editor and create a new HTML file. Mostly, you are right. Additionally, each key will be a button element. It represents a fraction of the available space in a grid container. They can still re-publish the post if they are not suspended. As with createResultString, we need to check the type of key that was clicked. To get started, lets create the HTML structure for your calculator. and comfortable with Logical Properties and would like to stay current with In my spare time, I enjoy Here, we need calculatedValue and displayedNum. How to choose a Technology Stack for Web Application Development ? HTML calculator is used for performing basic mathematical operations like Addition, subtraction, multiplication, and division. Since we want to return all values, we can convert else if statements into early returns. In the next tutorial, we will bring the calculator to life using JavaScript. Since we want it to span to the last row (line 6), well set the grid-row-end to 6. No Javascript! Well get to the .calculator-keys container in the next section which is where all the CSS Grid work will happen. If Tim hits a decimal key when the display already shows a decimal point, nothing should happen. If you're into Go, JavaScript or TypeScript, I think you'll enjoy Here, we can remove assignments if we return the result of the calculation within the if and else if statements: Since we return all values, we can use early returns. If you want to access the text within a non-input HTML element, then you are going to have to use the innerHTML property instead of value. Here, we can check that the displayed number contains a . Right after they click subtract, before we calculate the result, we set secondValue as the displayed number. Lastly, as pointed out by gillesc, use the attribute value on the input element. Here, we can copy and paste the code we had before: Heres whats left from what weve written for operator keys, after moving pieces related to display.textContent into createResultString. Once we have the correct previousKeyType, we can use it to check if the previous key is an operator. If you would watch a detailed step-by-step video instead you can check out the video I made covering this project on my Youtube Channel: The html will be pretty simple for this project. because inputs have value property, if you want to show text/data in them. Im a huge fan of punctuation. Rainbow Rowell. To fix this we can change it's height to auto. Calculation of the numbers can be done by both the "Enter" key as well as the "=" button on the Calculator UI. Also please not that for the equal sign button we have a separate id equal. Can I also say: 'ich tut mir leid' instead of 'es tut mir leid'? I did this purely for display purposes. You can find the starter files for this tutorial on JSFiddle. Each button will be a div with a class of button.