**Characters** hold #key# ASCII: American Standard Code for Information Interchange #key# codes. **ASCII** was developed as a standard character set for computers and electronic devices. 

These codes or numbers can also be called character codes or their equivalent number.  

# 
#  Using `event.charCode`

In Javascript, **`event.charCode`**, which is a property of the keyboard event `keypress`, prints the character code of any character on the keyboard.

##
## Code

The example below reveals the `charCode` of any character entered in the input box below. The `keypress` event is used to determine the character pressed.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <label>Fill in the text box</label><br>
    <input type="text" name="char" id="char">
    <span id="code" style="color: red;"></span>
</body>
</html>

codemirror

# 
## `charCode`  range of lowecase characters
![](/api/edpresso/shot/6063403560337408/image/4883870249385984)

Alphabets have their `charCode` values in a particular range. Lowercase alphabets fall within the range of *97 - 122*.

---
> The trick to determine if a character is lowercase lies in knowing its value in the range 97 - 122.

# 
## How to check if a character is lowercase

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <label>Fill in the text box</label><br>
    <input type="text" name="char" id="char">
    <span id="message" style="color: red;"></span>
</body>
</html>

# 
## Explanation

From the code above, we can see that any `charChode` that falls outside the range of *97 - 122* is not lowercase.

How to check if a character is lowercase in Javascript

Check if a character is lowercase in JavaScript by ensuring its charCode falls between 97 and 122.

How to check if a character is lowercase in Javascript

Using event.charCode

Code

charCode range of lowecase characters

How to check if a character is lowercase

Explanation

Using `event.charCode`

`charCode` range of lowecase characters