Java Script Codes For Html – This will be a great blog where you will learn how to make a calculator from scratch using HTML and CSS, and JavaScript! Here’s a quick demo👇
Let’s start with HTML -> I used data attributes in HTML because it’s easier! Don’t worry, you can copy-paste the HTML code from the repo I linked at the bottom of this blog.
Java Script Codes For Html
You can check out the CSS from the source code I linked at the bottom of the blog, as our main focus is computational logic and JavaScript!
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First things first, we create a calculator class and then select all elements with data attributes using the DOM and initialize the calculator class.
Create all the functions the calculator class can do and write them, don’t worry, we’ll fill in the logic next!
The constructor takes two parameters as input i.e. previousOperandTextElement and currentOperandTextElement and we call the open function to clear all the previous calculations when the new operator is called.
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The clear method is used to clear the entire output screen. For this we just need to set the current operand and the previous operand to empty terms and undefined operands and it will clear everything.
The delete method is used to delete the last number entered in the current operand. To do this, we just need to replace the current operand with a string and then cut the last element from the string.
The AppendNumber method is used to add a number to the end. It takes a number as an argument and converts it to a string and appends the typed number to the end. Also we have to check if the ‘.’ already exists so we don’t terminate the function and attach more.
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The SelectOperation method is used to attach the operation at the end and then calculate whether the object already exists in the previous operation. It also changes the current operand to the previous operand so that it goes to the top of the display. Also check if the current operand is an empty string, and if it is then just return and if the previous operand is not a null number and then replace it with the current operand.
The calculate method stores the result of the calculation. For this we need to convert string to number first, then check if the previous operand and current operand exist or not return, then use switch statements to create the logic of the calculator. Then you have to replace the current operand with a calculation to show the result of the calculation and also update the previous operand with an empty string and an undefined operand!
GetDisplayNum is used to display numbers in a better and more attractive way. The function divides the decimal number by the ‘.’ and then updates as the integer before the ‘.’ for example is displayed: 355555.23 is displayed as 3, 55, 555.23 which looks better.
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UpdateDisplay is used to display the code on the frontend. In this we change the internal text of currentOperandTextElement and previousOperandsTextElement to currentOperation and previousOperation after the calculation. Watch the snippet below for better understanding.
As we used querySelectorAll to select the number and function buttons, we need to use forEach to search all buttons and add EventListeners to them, see the snippet to understand more!
And finally we need to add EventListeners for equalsButton, allClearButton, and deleteButton also don’t forget to update the display!
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The rest is self-explanatory, dm me if you have a problem, I’ll be happy to help!
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There are two main roles in the online world: content creators and coders. Content creators write copy, craft visuals, and dream up tools that users pay (or put up with ads) to enjoy.
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Encoders ensure that content reaches the most people. These people build complex systems that deliver content – as efficiently as possible – and they do it well in the process.
If you’re a content creator like me, who’s in awe of how creative writers look at their keyboards, design landing pages and web apps, then this short guide is for you.
You don’t need a translator to understand the code. The basics are really, well, very basic. With a little research, you can pick up the skills you need to create your own HTML page or make changes to the text size, fonts and layout of your website. It will take a lot of time – at least a few evenings – and a willingness to get your hands dirty quickly, but it is possible. That’s how I got to the point where I don’t really call myself a developer, but I like to say that I hack together whatever is needed.
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When you embrace hacking ideas, the ways you can use them will immediately appear: create a landing page for your next marketing campaign, increase the quality of your next launch or change parts of your Twitter engagement. When an obstacle (or opportunity) presents itself and you’re willing to dig, anything is possible.
When you do, you’ll find that the basic workflow is often the same. First, you clearly define what you want to do. Then you look for existing code and tutorials that will help you put together a working solution. Think of it as Lean Startup applied to learning – instead of investing in programming education, just learn the practical skills you need to improve or build your target product. Do it today, learn more next month, and more next month, and soon you’ll be amazed at how much you can do with curly braces.
This post will help you get started on that path by setting a challenge – creating a sales page for a new product – giving you tips along the way, and pointing you to resources where you can learn more.
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In the next sections, I’ll walk you through creating your own fake product landing page. You can jump right in, or you can start by going through the HTML and CSS exercises first.
If you haven’t already, take a few days and work through a Codecademy class on HTML and CSS. It is one of the fastest online ways to get a basic understanding of these two languages. For bonus points, go through their courses on JavaScript and JQuery so you can master those as well.
A limitation of Codecademy, however, is that it does not make it very easy to transfer your knowledge from their environment to your own project. That’s where “hacking it together” comes in.
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If you want to get more practice with HTML and CSS, you can go to JSFiddle to try creating basic pages. Use it to explore how different elements affect the page layout, and to play with some basic layouts. If you want a very simple example, try the sample start layout. You can also add your own JavaScript.
Landing pages are one of the easiest ways to test a new idea, gather interest in an upcoming product or build a business email list. Usually you have to ask a colleague to build one for you, pay to build it or use a template landing page builder like Unbounce. But by the end of this lesson you will be able to create one yourself.
The best place to start building a landing page is not from a blank page. Instead, it’s someone else’s work – as in, you can use someone else’s code to create your own landing page. If this feels like a shortcut or a cheat, that’s because it is—remember, the goal here is to complete the project, not to do it in a way that can win you an award. And to do this, you can rely on the kindness of other developers who have shared their code.
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Let’s find out what we are building. If you want, use this tutorial to create a landing page for your own product or business, but if you don’t have one to work with, let’s pick an imaginary product and go with it.
In Silicon Valley, Season 2, one of the characters works on a program called “Bro”, which is basically a spin-off of “Yo”, which
