Answers to Exercises - Beginning JavaScript - page 655

var userValue = $(“#username”).val();
if (userValue == “”)
{
alert(“Please enter a user name to check!”);
return false;
}
var userParms = new Object();
userParms.username = userValue;
$.get(“formvalidator.php”, userParms, checkUsername_callBack);
if (isUsernameTaken)
{
alert(“The username “ + userValue + “ is not available!”);
return false;
}
//Now check the email
var emailValue = $(“#email”).val();
if (emailValue == “”)
{
alert(“Please enter an email address to check!”);
return false;
}
var emailParms = new Object();
emailParms.email = emailValue;
$.get(“formvalidator.php”, emailParms, checkEmail_callBack);
if (isEmailTaken)
{
alert(“I'm sorry, but “ + emailValue +
“ is in use by another user.”);
return false;
}
//If the code's made it this far, everything's good
return true;
}
var ajaxOptions = new Object();
ajaxOptions.async = false;
$.ajaxSetup(ajaxOptions);
function request_error(event, request, settings)
{
alert(“An error occurred with the following URL:\n”
+ settings.url + “.\nStatus code: “ + request.status);
}