books on interracial dating - Javascript validating empty fields

If its not blank, the function returns an empty string.validate Username ( ) The function below checks if the user entered anything at all in the username field.This is done with the help of built in properties of Java Script strings; take the value of input textbox trim it and then check for empty string. In series of validation scheme there are various kind of validation scheme, Let’s some more different kind of validations.

javascript validating empty fields-67

If the element complies than sufunction returns an empty string.

Otherwise it returns a message describing the error and highlight appropriate element with yellow.

Also, the @ must not be the first character of the email address, and the last dot must at least be one character after the @ sign.

At first we check if the user entered anything at all in the email field.

So we should use a new regular expression to forbid underscopes. Next, we want to permit only passwords that contain letters and at least one numeral.

For that we use the seacrh() method and two more regular expressions: /(a-z) / and /(0-9)/.We want to allow only letters, numbers and underscopes.validate Password ( ) The function below checks the password field for blankness and allow only letters and numbers - no underscopes this time.At first we use regular expression and the replace() method to clear out any spacer characters.Next, we use the is Na N() function to check if the phone number contain only numbers.For the majority of your users, Java Script form validation will save a lot of time up front, but double-checking the data on the server remains necessary, in case the user has turned Java Script off.

Tags: , ,