Validate an field with a maximum number of characters


<html>

<head>
<script type="text/javascript">
function validate(){
    x=document.myForm
    input=x.myInput.value
    if (input.length>5){
        alert("The field cannot contain more than 5 characters!")
        return false
    }else {
        return true
    }
}
</script>
</head>

<body>
<form name="myForm" action="http://www.java2s.com" onsubmit="return validate()">
Enter some text (less than 5 characters):
<input type="text" name="myInput" size="20">
<input type="submit" value="Submit">
</form>
</body>

</html>

Related examples in the same category

1.	Form validation: Not Empty, Valid Radio, is Number, string length, EMail Address
2.	Validate an input field with minimum and maximum values
3.	Phone Number Validation
4.	Creating Reusable Validation Code
5.	Credit Card Validation
6.	Money Format
7.	Validating User Input
8.	Validate email address
9.	Validate a number
10.	TextField input length validator
11.	Password field validator
12.	TextField validator: email, IP address and URL
13.	Must be at least 3 characters and not more than 8
14.	Only characters are allowed
15.	Can be empty
16.	Must be a valid email address
17.	ComboBox(list box): Must be selected one
18.	InputBox: value must be between 10 and 90
19.	Not stop when the first failed validation is encountered
20.	A CSS is used to highlight the fields which failed to validate
21.	Need to select a file
22.	A simple form with two passwords that must have the same value
23.	Shows the usage of callback functions for checking a field
24.	Javascript validation framework
25.	Form validator library

Validate an field with a maximum number of characters : Validation « Form Control « JavaScript DHTML

Related examples in the same category