August 24, 2022

How to Add Line Break Dynamically in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to add line break dynamically in javascript. A string can contain any number of characters, including letters, numbers, punctuation, and special ones. Additionally, to make a string easier to read, we add some line breaks. For a newbie developer, it can be a bit tricky to add line break dynamically.

There are numerous ways to add line break dynamically. But for the sake of simplicity, we will make use of template string which helps in creating a dynamic string by using variables in it.

In the following example, we have some global variables. Upon click of a button, we will add line break dynamically 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, and h1). The div element is just a wrapper for the rest of the elements.
The innerText for the button element is “Add” and for the h1 element, it is “Result”.

We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
We have also included our javascript file script.js with a script 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 and h1 element using the document.querySelector() method and stored them in btnAdd and output variables respectively.
We have three global variables str1, str2 and newLineChar where the first two holds a string and the latter holds a new line character (\n).
We have attached a click event listener to the button element.

In the event handler function, we are creating a string dynamically using template literal where we we are using global variables str1, str2 and newLineChar .
We are storing the final string in the result variable.
We are displaying the result in the h1 element using the innerText property.

let btnAdd = document.querySelector("button");
let output = document.querySelector("h1");

let str1 = "Hi,";
let str2 = "Mr. Mathew";
let newLineChar = "\n";
 
btnAdd.addEventListener("click", () => {  
  let result = `${str1}${newLineChar}${str2}`;
  output.innerText = result;
});

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