Get Input Value Length in JavaScript

In this tutorial we will learn how to Get Input Value Length in JavaScript. HTML DOM getElementById() method, JavaScript length property and JavaScript value property is used for this purpose.

Table of Contents

• HTML Code
• JavaScript Code
• getElementById() Method
• JavaScript value property
• JavaScript length property
• Demo
• Video Tutorial
• More JavaScript Tutorials

HTML Code

HTML Code is given below, in this code we have a input tag and a button tag with onclick event which will execute a JavaScript function to get the length of the value inside the input element.

<input type="text" id="input">    
<button onclick='getLength()'>Click Me</button>      

JavaScript Code

Take a look at the JavaScript code, the HTML Dom getElementById() method, length property and value property is used.

<script>
function getLength()
{
    var element = document.getElementById('input');
    var length = element.value.length;
    alert(length);
}
</script>

getElementById() Method

getElementById() Method is used to select element with the specified id.

JavaScript value property

JavaScript value property is used to set or get the value of the selected HTML element.

JavaScript length property

JavaScript length property is used to get the length of the string. In this example it will return the length of the value of input element.

Demo

Check Demo

Video Tutorial

Watch video tutorial on Get Input Value Length in JavaScript.