It happens sometimes, when user forgets to choose option from the select feild.In that case, the form should convey about issue so that user can take the action.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.function true Selection(inputtext, alert Msg) // Function that checks whether an user entered valid email address or not and displays alert message on wrong email address format.In the above form, we are calling validate() to validate data when onsubmit event is occurring.The following code shows the implementation of this validate() function.When setting options via HTML attributes, remember to enable the validator by setting data-fv-integer="true".You don't need to do that when i) using HTML 5 type="number" attribute, ii) and the step attribute is not specified, or its value is an integer The thousands and decimal separators might take different value in certain countries.
The sequence is defined as: [alphabets/numbers/underscore/plus [email protected]/numbers/periods.domain name] If the entered email address is not in a proper sequence, then the message will popup which says “Wrong Email Address”. [a-z] : It matches characters from lowercase ‘a’ to lowercase ‘z’. If by mistake, user skips entering any detail, soon the alert message appear on the form. escaping - by -) [0-9] : It matches digital number from 0-9. That means, you could be very sure about the form, whether users have entered the details or not.The following table introduces some popular values that are defined by various countries.You can click the sample number to test: Since the thousands and decimal separators are various, the field should use type="text" attribute.
By combining the expression for numbers and alphabetic characters, there is an expression that checks, whether the entered things includes numbers and alphabetic character or not.