September 17, 2022
How to Merge Multiple Strings in Javascript
In this tutorial, you will learn how to merge multiple strings in javascript. In some circumstances, it seems likely that we will need to attach one or more strings to a single string in order to give it meaning. For a newbie developer, it can be a bit tricky to merge multiple strings.
There are numerous ways to merge multiple strings. But for the sake of simplicity, we will make use of addition operator (+
) which helps in concatenating two or more strings.
In the following example, we have two global variables that are holding a string value. Upon click of a button, we will merge multiple strings and display the result 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“Add”
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>Add</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 inbtnAdd
andoutput
variables respectively. - We have two global variables
firstName
andlastName
. They both hold a string as a value. - We have attached a
click
event listener to thebutton
element. - In the event handler function, we are concatenating
firstName
andlastName
variables using addition operator (+
) . We are also adding a space in the middle to keep the strings separated from one another. - We are storing the final string in the
result
variable. - We are displaying the
result
in theh1
element using theinnerText
property.
let btnAdd = document.querySelector("button"); let output = document.querySelector("h1"); let firstName = `Ryan`; let lastName = `Gosling`; btnAdd.addEventListener("click", () => { let result = firstName + ' ' + lastName; output.innerText = result; });