Detecting Character Input in Text-Box with JavaScript

  1. Introduction
  2. The Code
  3. Conclusion


As a web developer, it's common to encounter a situation where it's necessary to detect character input in a text-box. Whether it's for form validation or real-time search filtering, knowing how to detect and handle character input is an important skill. In this article, we'll explore how to detect character input in an <input> text-box using JavaScript.

The Code

To detect character input, we'll need to use the oninput event. This event fires whenever the value of an <input> element changes, including when a character is typed or deleted.

Here's an example of how to use the oninput event to detect character input in an <input> text-box:

<input type="text" oninput="handleInput(event)">

  function handleInput(event) {

In this code, we've added an oninput attribute to the <input> element and set it to call the handleInput function whenever the input value changes. The handleInput function logs the current value of the <input> element to the console.


Detecting character input in an <input> text-box is a common requirement in web development. By using the oninput event in JavaScript, we can easily detect and handle character input in real-time. With this knowledge, we can build more robust and user-friendly web applications.

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