Validation

validateFormOnSubmit ( ) This is a master(prenominal) piece that calls a series of sub contributions, severally of which checks a single form atom for compliance. If the element complies than sufunction returns an change string. otherwise it returns a message describing the flaw and highlight earmark element with yellow. function validateFormOnSubmit(theForm) { volt-ampere  lawsuit = ;   close += validateUsername(theForm.username);   reason += validatePassword(theForm.pwd);   reason += validateEmail(theForm.email);   reason += validatePhone(theForm.phone);   reason += validateEmpty(theForm.from);          if (reason != ) {     alert(Some fields emergency field: + reason);     return false;   }   return lawful; } validateEmpty ( ) The function at a lower place checks if a require field has been unexpended empty. If the required field is blank, we return the computer illusion string to the main function. If its non blank, the function return s an empty string. function validateEmpty(fld) {     var misconduct = ;        if (fld.value.duration == 0) {         fld.style.background = Yellow;          error = The required field has non been fill up in.     } else {         fld.style.

background = White;     }     return error;    } Back to top validateUsername ( ) The function below checks if the user entered anything at all in the username field. If its not blank, we check the length of the string and permit all usernames that ar between 5 and 15 characters. Next, we use the JavaScript regular construction /\W/ t o keep illegal characters from appearing in! usernames. We loss to allow only letters, numbers and underscopes. function validateUsername(fld) {     var error = ;     var illegalChars = /\W/; // allow letters, numbers, and underscores       if (fld.value == ) {         fld.style.background = Yellow;          error = You didnt enter a username.;     } else if ((fld.value.length < 5) || (fld.value.length > 15)) {         fld.style.background = Yellow;          error = The username is...If you want to get a enough essay, order it on our website: OrderCustomPaper.com

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