April 5, 2022

How to Find Length of String in Textbox Using Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to find length of string in textbox using javascript. The length of a string represents the total number of characters in that string.

There are numerous ways to find length of a string in textbox. 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 will enter a value in the input element and upon click of a button, we will find length of a string in textbox and display it on the screen. Please have a look over the code example and the steps given below.

HTML & CSS

We have 4 elements in the HTML file (div, input, button, and h1). The div element is just a wrapper for the rest of the elements.
The innerText for the button element is “Get” 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">    
    <input type="text" />
    <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;
}

input {
  display: block;
  padding: 5px 10px;
  margin: auto;
}

Javascript

We have selected the button element, input element, and h1 element using the document.querySelector() method and stored them in btnGet, inputEl and output variables respectively.
We have attached a click event listener to the button element.
In the event handler function, we are getting value from the input element and storing it in the myString variable.
We are using the length property to get the length of myString. We are assigning the returned value to the result variable.
We are displaying the result in the h1 element using the innerText property.

let btnGet = document.querySelector("button");
let inputEl = document.querySelector("input");
let output = document.querySelector("h1");

btnGet.addEventListener("click", () => {
  let myString = inputEl.value;
  let result = myString.length;
  output.innerText = result;
});

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