We're going to be checking the form using a function, which will be activated by the form's Validating this form would be considerably simpler than one containing radio buttons or select boxes, but any form element can be accessed.Below are the ways to get the value from all types of form elements.
In that case, the form should convey about issue so that user can take the action.
No need to write even a single Java Script line for simple form validation.
View example » Parsley is shipped with more than a dozen useful validators.
In all cases, the form is called That's checking the value's equality with a null String (two single quotes with nothing between them).
When you are asking a reader for their email address, you can use a simple » address validation function to make sure the address has a valid structure. Each option in a drop-down box is indexed in the array Annoyingly, there is no simple way to check which radio button out of a group is selected — you have to check through each element, linked with Boolean AND operators .
Validation codes will return an alert message, if it finds some empty fields in the form.
If an user miss out any field, than the form will display error message.
function input Alphabet(inputtext, alert Msg) // Function that checks whether input text includes alphabetic and numeric characters.
function text Alphanumeric(inputtext, alert Msg) // Function that checks whether the input characters are restricted according to defined by user.
function form Validation() // Function that checks whether input text is numeric or not.
function text Numeric(inputtext, alert Msg) // Function that checks whether input text is an alphabetic character or not.
function length Define(inputtext, min, max) // Function that checks whether a option is selected from the selector and if it's not it displays an alert message.