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In this post, you will find the solution for Day 8: Buttons Container in JavaScript-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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Introduction To JavaScript
JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is well-known for the development of web pages, many non-browser environments also use it. JavaScript can be used for Client-side developments as well as Server-side developments. JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements like operators, control structures, and statements.
Advantages of JavaScript
The merits of using JavaScript are −
- Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
- Immediate feedback to the visitors − They don’t have to wait for a page reload to see if they have forgotten to enter something.
- Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
- Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.
Link for the Problem – Day 8: Buttons Container – Hacker Rank Solution
Day 8: Buttons Container – Hacker Rank Solution
Problem:
Objective
In this challenge, we lay out buttons inside a div and modify their labels after each click event on one of the buttons. Check out the attached tutorial for learning materials.
Task
We want to create nine buttons enclosed in a div, laid out so they form a grid. Each button has a distinct label from to , and the labels on the outer buttons must rotate in the clockwise direction each time we click the middle button.
Complete the code in the editor so that it satisfies the following criteria:
- Initial State. The initial layout looks like this:
- Element IDs. Each element in the document must have an
id, specified below:- The button container div‘s
idmust bebtns. - The initial
innerHTMLlabels must have the following buttonids:
innerHTMLid1btn12btn23btn34btn45btn56btn67btn78btn89btn9 - The button container div‘s
- Styling. The document’s elements must have the following styles:
- The
widthofbtnsis , relative to the document body’s width. - Each button (i.e.,
btn1throughbtn9) satisfies the following:- The
widthis , relative to its container width. - The
heightis48px. - The
font-sizeis24px.
- The
- The
- Behavior. Each time
btn5is clicked, theinnerHTMLtext on the grid’s outer buttons (i.e.,bt1,btn2,btn3,btn4,btn6,btn7,btn8,btn9) must rotate in the clockwise direction. Do not update the buttonid‘s.
The .js and .css files are in different directories, so use the link tag to provide the CSS file path and the script tag to provide the JS file path:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="css/buttonsGrid.css" type="text/css">
</head>
<body>
<script src="js/buttonsGrid.js" type="text/javascript"></script>
</body>
</html>
Explanation
Initially, the buttons look like this:
After clicking btn5 time, they look like this:
After clicking btn5 more time (for a total of clicks), they look like this:
Day 8: Buttons Container – Hacker Rank Solution
<!-- HTML -->
<div id="btns">
<button id="btn1">1</button>
<button id="btn2">2</button>
<button id="btn3">3</button>
<button id="btn4">4</button>
<button id="btn5">5</button>
<button id="btn6">6</button>
<button id="btn7">7</button>
<button id="btn8">8</button>
<button id="btn9">9</button>
</div>
/* CSS */
#btns {
width: 75%;
}
button {
width: 30%;
height: 48px;
font-size: 24px;
}
// JS
const ids = [1, 2, 3, 6, 9, 8, 7, 4]; // start positions ids in clockwise order
let nums = [1, 2, 3, 6, 9, 8, 7, 4]; // rotating in clockwise order
let btn5 = document.getElementById("btn5");
btn5.onclick = function() {
nums.unshift(nums.pop());
for (i = 0; i <= 7; i++) {
document.getElementById("btn" + ids[i]).innerHTML = nums[i];
}
};
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