I am making a game with JavaScript and it is just prompt after prompt asking you questions to make decisions, such as: -
var turn=prompt("Will you turn left or right?");
-
if (turn="left") {
-
document.write("You chose to turn left!");
-
window.location="nextchoice.html";
-
}
-
if (turn="right") {
-
document.write("You chose to turn right!");
-
window.location="nextchoice.html";
-
}
-
How can I reset the prompt if the user hasnt put one of the answer choices he had to?
I was using your code, albeit in an abreviated form, to let you know in case it wasn't just a typo. :)
Rabbit provided the answer, so I thought it would be best to leave that part alone. If you still need a slight nudge, then my preference would be to use a do while loop. -
var turn;
-
-
do
-
{
-
// prompt
-
} while(turn isn't "left" and turn isn't "right");
-
-
// do something with turn
-
To correctly fill in the while statement, you'll need to read up on using logical expressions.
6  1550 
Put it in a loop until a satisfactory answer has been given. In psedocode it would be like this: - loop until input equals left or right
-
input = ask user to input left or right
-
end loop
Wow Rabbit, you are extremely helpful! No wonder you are on the top contributors list! However, I have a question: I am 12 and am on a JavaScript course, and my next unit is Loops. However, I really want to start making this game right now, and I don't want to bother you, but can you please show me how to make a real loop in JavaScript and not in psedocode, meaning something the computer will understand. Thank you!
-
if (turn="left")
-
...
-
if (turn="right")
-
...
-
Unrelated to the loop question, but the above code is assignment and not comparison. If you're wanting to test whether or not turn is equal to "left" or "right," then use == and not =
Thank you, @divideby0 , about the fact that you noticed that I had put assignment and not comparison operators. However, isn't the code you showed just another if/else statement? My question was if, say, in the prompt the user wrote "forward" which is not a valid answer, how can I make it so that the script returns to the same prompt and doesn't let the user go forward until he writes one of the valid answers, which are "left" and "right"
I was using your code, albeit in an abreviated form, to let you know in case it wasn't just a typo. :)
Rabbit provided the answer, so I thought it would be best to leave that part alone. If you still need a slight nudge, then my preference would be to use a do while loop. -
var turn;
-
-
do
-
{
-
// prompt
-
} while(turn isn't "left" and turn isn't "right");
-
-
// do something with turn
-
To correctly fill in the while statement, you'll need to read up on using logical expressions.
You cannot use a document.write() AFTER the page has loaded.
Doing so causes the page to reload and re-start the game.
Consider this... -
<!DOCTYPE html>
-
<html lang="en">
-
<head>
-
<meta charset="utf-8" />
-
<title> Untitled </title>
-
</head>
-
<body>
-
<div id="debugger"></div>
-
-
<script type="text/javascript">
-
var turn;
-
do {
-
turn = prompt('',"Will you turn left or right?");
-
if (turn=="left") {
-
document.getElementById('debugger').innerHTML = "You chose to turn left!";
-
// window.location="nextchoice.html";
-
}
-
if (turn=="right") {
-
document.getElementById('debugger').innerHTML = "You chose to turn right!";
-
// window.location="nextchoice.html";
-
}
-
} while ( (turn == 'right') || (turn == 'left') );
-
-
</script>
-
-
</body>
-
</html>
-
Note also that window.location will cause the page to close and open the 'nextchoice.html' site.
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