Find string in httpxml.responseText

Question

Below is my code which I am trying to find 'Username Ok' in the respone text, and then flag UserNameOk as true. I cannot get this working.

function check_username(username)
{
    var httpRequest;
    make_request()
    function stateck() 
    {

     if(httpxml.readyState==4)

      { 
      if (httpxml.responseText == "Username Ok")
      {
        UserNameOk = true;

      }
       else 
      {
         UserNameOk = false;
      }
     checkCanSubmit();
     document.getElementById("user_div").innerHTML=httpxml.responseText;
      }
    }

    httpxml.onreadystatechange=stateck;
    user_url="ajax_username.php?username=" + username.value;
    httpxml.open("GET",user_url,true);
    httpxml.send(null);

}

Below is my checkCanSubmit code

function checkCanSubmit()
{
    if (UserNameOk && PasswordOk && EmailOk)
    {
    document.getElementById("button").disabled= false;
    }
    else
    {
    document.getElementById("button").disabled= true;
    }
    }

Any help will be appreciated Thanks.

Answer 1

Are you seeing the correct response come in through firebug?

First step is to make sure your server is returning the correct response by looking at firebug. I might also simplify the code to help narrow down the issues. Try:

function check_username(username)
{
    var httpRequest;
    make_request()
    function stateck() 
    {

            if(httpxml.readyState==4)

             {  
                    if (httpxml.responseText == "Username Ok")
                    {
                             alert('1');
                             UserNameOk = true;

                    }
                     else 
                    {
                            alert('2');
                            UserNameOk = false;
                    }
             }
    }

    httpxml.onreadystatechange=stateck;
    user_url="ajax_username.php?username=" + username.value;
    httpxml.open("GET",user_url,true);
    httpxml.send(null);

Can you be more specific about where the problem is?

Answer 2

Just a guess: the response might be something like "Username Ok\n" (the '\n' being a newline character which you can't see). Or it might have whitespace at the beginning or end. You could print out (alert) the length of the string to test that.