Validation

validateFormOnSubmit ( ) This is a master(prenominal) get going that calls a series of sub croaks, severally of which checks a single form gene for compliance. If the element complies than sufunction returns an change string. other than it returns a message describing the flaw and highlight earmark element with yellow. function validateFormOnSubmit(theForm) { volt-ampere  lawsuit = ;   fountain += 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 discipline: + reason);     return false;   }   return lawful; } validateEmpty ( ) The function at a lower place checks if a necessary field has been unexpended empty. If the required field is blank, we return the erroneousness string to the main function. If its non blank, the function retur ns an empty string. function validateEmpty(fld) {     var fracture = ;        if (fld.value. distance == 0) {         fld.style.background = Yellow;          shift = 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 completely usernames that ar between 5 and 15 characters. Next, we use the JavaScript regular construction /\W/ to command illegal characters from appearing in usernames. We loss to allow only letters, numbers and undersco! pes. 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: OrderEssay.net

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