Member Avatar for n33712

Hi

Have a problem writing what i am sure is simple Javascript but have been trying to get round a problem for ages.

The program asks the user to enter either 1 or 2 (there is a window prompt to say what option 1 and 2 are)

When they enter 1 or 2 the program then displays a appropriate message on the screen.

If the user enter any other value a message appears telling them they have entered a wrong value and to try again.

So far this all works fine. What i am having trouble with is i want the program to bring up the window prompt with the first question again (please enter 1 or 2) this can be done with a simple loop but i only want the program to do the loop once. If the user enters a wrong value again i want the program to end.

If anyone can offer any help with this i would be very grateful. I am a newbie at Javascript so i hope it's not really simple!!!!!

Cheers

Matt

p.s. can post my code so far if it helps?

  • 5 Contributors
  • 9 Replies
  • 96 Views
  • 4 Days Discussion Span
  • Latest Post Latest Post by n33712
Member Avatar for masijade

This is the Java, not JavaScript, forum. You see the difference there?

Next time, post in the JavaScript forum, please.

I have already requested th admins move this thread.

Member Avatar for ~s.o.s~

Though I am not very clear as to what you mean, this snippet should give you a fair idea. If it doesn't, post your code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
            "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Example</title>
</head>
<body>
<script type="text/javascript">
    (function doSomething() 
    {
        while(true) {
            var ans = prompt("Enter either 1 or 2.");
            if(!ans || (ans != '1' && ans != '2')) {
                alert("You entered an invalid choice. Exitting...");
                break;
            }
            alert("You entered " + ans);
        }
    })();
</script>
</body>
</html>
Member Avatar for n33712

My code:

var option;

option = window.prompt('Please enter 1 if you would like to join or 2 if you are an existing user',''); 
option = parseFloat(option);

if (option == 1)
{
  document.write('Welcome, we will need to take some details')  
}
else
{
    if (option == 2)
    {
      document.write('Enjoy')
    }
        else
    {
          if (option != 1,2);
             { 
               window.prompt('Please choose from the available options, Please try again!')  
             }   
        }
}

What i need is for the user if they entered anything other than 1 or 2 to be asked once more what option they would like. If they fail on the second attempt then the program closes.

Cheers

Matt

Edited by mike_2000_17 because: Fixed formatting
Member Avatar for DangerDev

Hi,
I hope following is solution for u'r trouble,
(i have modify ~s.o.s~ code)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
            "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Example</title>
</head>
<body>
<script type="text/javascript">
 var loopTime=0;
    (function doSomething() 
    {
        while(true) {
            var ans = prompt("Enter either 1 or 2.");
            if(!ans || (ans != '1' && ans != '2')) {
                alert("You entered an invalid choice. Exitting...");
                if(loopTime>0)
                break;
                loopTime=1;
            }
            else
            {
                loopTime=0;
                alert("You entered " + ans);
            }

        }
    })();
</script>
</body>
</html>
Edited by mike_2000_17 because: Fixed formatting
Member Avatar for n33712

Hi

Thanks for your help so far.

I'm sorry for the confusion but have just been told i am to do this without using a loop!
Am more confused now.

Any help appreciated

Member Avatar for DangerDev

hi u dont want loop then try this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
            "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Example</title>
</head>
<body>
<script type="text/javascript">
var count=0;
    (function recTest() 
    {
            var ans = prompt("Enter either 1 or 2.");
            if(!ans || (ans != '1' && ans != '2')) 
           {
                alert("You entered an invalid choice !");
                count++;				
            }
			else
			{
				alert("You entered " + ans);
				count=0;
			}
			if(count<=1)
				recTest();
	})();
</script>
</body>
</html>
Member Avatar for MidiMagic

Easier:

ans = getinfo();
if(ans!=1 && ans!=2){ans = getinfo();};
Member Avatar for n33712

HI

Thank you so much for your help.
What you have written above is almost exactly what i wanted. The only thing that i needed was a different message appearing on the screen depending on whether the user entered 1 or 2. I have been trying to come up with a answer on my own but as you may have guessed Javascript is not my thing :)
At the moment is gives a message saying "You entered (+ answer user typed)"
Is there a easy answer to getting a different message for answer "1" and answer "2"?

Cheers again for your help

Matt

Member Avatar for n33712

Hi

Managed to get it all working now. Thank you for all your help.
Not sure i would have made it without your help.

Cheers

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.