How to display JavaScript array items one at a time in reverse on button click?

https://www.tutorialspoint.com/how-to-display-javascript-array-items-one-at-a-time-in-reverse-on-button-click

10-09-2020
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Question

Let’s say the following is our array −

var listOfNames = [
   'John',
   'David',
   'Bob'
];

Following is our button −

<button id="reverse" onclick="reverseTheArray()">Click The Button To get the Reverse Value</button>

Now, for array items in reverse, at first, reach the array length and decrement the length by 1. Then, print the contents of the particular index in reverse order.

Example

Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=1.0">
<title>Document</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div align="center" id='reverseTheArray'></div>
<button id="reverse" onclick="reverseTheArray()">Click The Button To get
the Reverse Value</button>
<script>
   var listOfNames = [
      'John',
      'David',
      'Bob'
   ];
   count=listOfNames.length-1;
   function reverseTheArray(){
      document.getElementById('reverseTheArray').innerHTML =
      listOfNames[count];
      count--;
      if (count<0)
         count=listOfNames.length-1;
   }
</script>
</body>
</html>

To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.

Output

This will produce the following output −

Step 1

When you click the button, you will get the last value of the array. This will produce the following output −

Step 2

Again, click the button, you will get the second last value. This will produce the following output −

AmitDiwan

Published on 09-Sep-2020 13:12:56

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