JavaScript: Add items in a blank array and display the items
JavaScript Array: Exercise-13 with Solution
Write a JavaScript program to add items in an blank array and display the items.
Sample Screen:
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<style>
body {padding-top:50px}
</style>
</head>
<body>
<input type="text" id="text1"></input>
<input type="button" id="button1" value="Add" onclick="add_element_to_array();"></input>
<input type="button" id="button2" value="Display" onclick="display_array();"></input>
<div id="Result"></div>
</body>
</html>
JavaScript Code:
var x = 0;
var array = Array();
function add_element_to_array()
{
array[x] = document.getElementById("text1").value;
alert("Element: " + array[x] + " Added at index " + x);
x++;
document.getElementById("text1").value = "";
}
function display_array()
{
var e = "<hr/>";
for (var y=0; y<array.length; y++)
{
e += "Element " + y + " = " + array[y] + "<br/>";
}
document.getElementById("Result").innerHTML = e;
}
Flowchart:
ES6 Version:
let x = 0;
const array = Array();
function add_element_to_array()
{
array[x] = document.getElementById("text1").value;
alert(`Element: ${array[x]} Added at index ${x}`);
x++;
document.getElementById("text1").value = "";
}
function display_array()
{
let e = "<hr/>";
for (let y=0; y<array.length; y++)
{
e += `Element ${y} = ${array[y]}<br/>`;
}
document.getElementById("Result").innerHTML = e;
}
Live Demo:
See the Pen JavaScript: Add items in a blank array and display the items - array-ex-13 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to compute the sum and product of an array of integers.
Next: Write a JavaScript program to remove duplicate items from an array (ignore case sensitivity).
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JavaScript: Tips of the Day
How to insert an item into an array at a specific index (JavaScript)?
What you want is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:
var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());
Ref: https://bit.ly/2BXbp04
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