[SOLVED] Java script does not work from a web browser

fakie_flip · 04-01-2013, 01:31 PM

Code:

var userChoice = prompt("Do you choose rock, paper or scissors?"); var computerChoice = Math.random(); if (computerChoice < 0.34) {   computerChoice = "rock"; } else if (computerChoice <= 0.67) {   computerChoice = "paper"; } else {   computerChoice = "scissors"; } var compare = function(choice1, choice2) {   if (choice1 === choice2)   {     return("The result is a tie!");   }   else   {     if (choice1 === "rock") {       if (choice2 === "scissors")       {         return("rock wins");       }       else {         return("paper wins");       }     }   }   if (choice1 === "paper")   {     if (choice2 === "rock")     {       return("paper wins");     }     else {       return("scissors wins");     }   }   if (choice1 === "scissors")   {     if (choice2 === "paper")     {       return("scissors wins");     }     else {       return("rock wins");     }   } };

This code works when running through a javascript engine, but it's not working from a webserver. What must I do, so that it will work correctly in a web browser if i added the code to my vps?

http://www.codecademy.com/courses/ja...s/3/scratchpad

j-ray · 04-02-2013, 05:01 AM

1. You prompt a message but the reply is not connected to the function you wrote.

2. The function returns a string but this will not be displayed even if you connect the function to the OK-button. You could use console.log(string) or alert(string) instead of return.

sundialsvcs · 04-02-2013, 05:04 PM

Remember that JavaScript is included in a web-page either in "script" tags or by including a reference to an external library in the HTML page. (Take a look at the source code of any web-page to see what I mean.)

Then, something in the web page must cause that script to be executed in response to some event ... such as the clicking of a mouse button.

There are plentiful examples and tutorials on the Internet already.

Since this is obviously intended as an educational exercise, seek the answer yourself. This is very critical to the learning process. A very important skill that you absolutely must master, is to discover how to frame a problem and to find the answers that you are challenged to produce.

fakie_flip · 04-03-2013, 08:27 AM

Quote:

Originally Posted by j-ray

1. You prompt a message but the reply is not connected to the function you wrote.

2. The function returns a string but this will not be displayed even if you connect the function to the OK-button. You could use console.log(string) or alert(string) instead of return.

http://vpaste.net/YMkDb

I changed the code to use alert() like you said but still I am brought to a blank page after submitting an answer.

It is hosted here.

http://expectusafterlun.ch/rps.html

EDIT:

After looking at some examples, I removed the ; after the alert() but still, it is not working =/

j-ray · 04-03-2013, 08:58 AM

You have to call the function you created. I have given the function a name now.

Code:

<script type="text/javascript">


var userChoice = prompt("Do you choose rock, paper or scissors?"); 
		

var computerChoice = Math.random(); 
if (computerChoice < 0.34) {   
	computerChoice = "rock"; 
} else if (computerChoice <= 0.67) {   
	computerChoice = "paper"; 
} else {   computerChoice = "scissors"; 
} 
compare(userChoice, computerChoice );
function compare (choice1, choice2) {  
	
	if (choice1 === choice2)   {     
		return("The result is a tie!");   
	}   else   {     
		if (choice1 === "rock") {       
			if (choice2 === "scissors")       {         
				alert("rock wins");       
			}       
			else {        
				alert("paper wins");       
			}     
		}   
	}   
	if (choice1 === "paper")   {     
		if (choice2 === "rock")     {       
			alert("paper wins");     
		}     else {       
			alert("scissors wins");     
		}  
	}   
	if (choice1 === "scissors")   {     
		if (choice2 === "paper")     {       
			alert("scissors wins");     
		}     
		else {       
			alert("rock wins");     
		}   
	}
};

</script>

fakie_flip · 04-03-2013, 09:14 AM

Works now

http://expectusafterlun.ch/rps.html

fakie_flip · 04-03-2013, 11:58 AM

Thanks for the reply j-ray. I had done it a similar way:

http://vpaste.net/TMbsR