Validation

validateFormOnSubmit ( )
This is a master(prenominal) function that calls a series of subfunctions, severally of which checks a single form element 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 = ;

  reason += 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 correction:n + reason);
    return false;
  }

  return lawful;
}
validateEmpty ( )
The function at a lower place checks if a required field has been unexpended empty. If the required field is blank, we return the error string to the main function. If its non blank, the function returns an empty string.
function validateEmpty(fld) {
    var error = ;
  
    if (fld.value.length == 0) {
        fld.style.background = Yellow; 
        error = The required field has not been fill up in.n
    } else {
        fld.style.



background = White;
    }
    return error;   
}
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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 only usernames that ar between 5 and 15 characters. Next, we use the JavaScript regular construction /W/ to forbid 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.n;
    } 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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