April 5, 2022
How to Find Size of a String in Javascript
In this tutorial, you will learn how to find size of a string in javascript. The length of a string represents the total number of characters in that string. When it comes to a string, people also refer length as size .
There are numerous ways to find the size of a string. But for the sake of simplicity, we will use length
property. The length
property returns the length of the string. If the string is empty, then it will return 0.
In the following example, we have one global variable that holds a string. Upon click of a button, we will find the size of a string and display it on the screen. Please have a look over the code example and the steps given below.
HTML & CSS
- We have 3 elements in the HTML file (
div
,button
, andh1
). Thediv
element is just a wrapper for the rest of the elements. - The
innerText
for thebutton
element is“Get”
and for theh1
element, it is“Result”
. - We have done some basic styling using CSS and added the link to our
style.css
stylesheet inside thehead
element. - We have also included our javascript file
script.js
with ascript
tag at the bottom.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link rel="stylesheet" href="style.css"> <title>Document</title> </head> <body> <div class="container"> <button>Get</button> <h1>Result</h1> </div> <script src="script.js"></script> </body> </html>
.container { text-align: center; } button { margin-top: 10px; padding: 10px 20px; }
Javascript
- We have selected the
button
element andh1
element using thedocument.querySelector()
method and stored them inbtnGet
andoutput
variables respectively. - We have a global variable
myString
which holds a string as its value. - We have attached a
click
event listener to thebutton
element. - In the event handler function, we are using the
length
property to get the size ofmyString
. We are assigning the returned value to theresult
variable. - We are displaying the
result
in theh1
element using theinnerText
property.
let btnGet = document.querySelector("button"); let output = document.querySelector("h1"); let myString = "Hello world"; btnGet.addEventListener("click", () => { let result = myString.length; output.innerText = result; });