Javascript code for validating form

You'll see that the all validation scripts presented on this and subsequent pages adhere to the same basic format.

Most modern browsers now support HTML5 Form Validation making it possible to validate form elements without (or before) any Java Script is triggered.

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For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers.

When form input is important, it should always be verified using a secure server-side script.

Regular expression helps you in pattern matching in string. : Matches any single charcter except a new line : Matches the preceding character or repeated character. The basic expression for matching entered value as number in the field is: /^[0-9] $/.

[A-Z] : It matches characters from uppercase ‘A’ to lowercase ‘Z’. The codes for checking form empty fields are given below: There is an expression that checks whether the string contains only alphabets or not.

Validation codes will return an alert message, if it finds some empty fields in the form.