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tictactoe.html
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<!DOCTYPE html>
<html>
<head>
<title>tic tac toe</title>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", function(event) {
turn='player';
});
game_progress = "";
turntime = 1;
mode = 0;
corner = ["one", "three", "seven", "nine"];
field = ["one","two","three","four","five","six","seven","eight","nine"];
pick = Math.floor(Math.random() * (3 - 0 + 1)) + 0;
function myFunction() {
turn = "computer";
val1 = document.getElementById("one").value;
val2 = document.getElementById("two").value;
val3 = document.getElementById("three").value;
val4 = document.getElementById("four").value;
val5 = document.getElementById("five").value;
val6 = document.getElementById("six").value;
val7 = document.getElementById("seven").value;
val8 = document.getElementById("eight").value;
val9 = document.getElementById("nine").value;
winner(); /* call winner function to see if user has won */
if (game_progress == "done"){
document.getElementById('reset').innerHTML = "<input type='button' value='reset?' onclick='reset()' style='width: auto; height: auto;'>";
turn = 'computer';
return;
}
done = 0;
if (turntime == 1){
if(val5 == ""){
document.getElementById("five").value="O"; done = 1;
mode = 1;
} else {
document.getElementById(corner[pick]).value="O"; done = 1;
mode = 2;
}
turntime += 1;
}
/* computer trying to make the winning move */
/* if computer is in the middle, try to make row over the middle */
if (val5 == "O"){
if (val1 == "O" && val9 == ""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if (val2 == "O" && val8 == ""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if (val3 == "O" && val7 == ""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if (val4 == "O" && val6 == ""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
else if (val6 == "O" && val4 == ""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
else if (val7 == "O" && val3 == ""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if (val8 == "O" && val2 == ""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if (val9 == "O" && val1 == ""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
} else {
/* computer does not have the middle, try to complete a row anywhere */
if (val1 == "O"){
if(val2 == "O" && val3==""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if(val3 == "O" && val2==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val4 == "O" && val7 == ""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if (val7 == "O" && val4 ==""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
else if (val3 == "O"){
if(val2 == "O" && val1==""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
else if(val1 == "O" && val2==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val6 == "O" && val9 == ""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if (val9 == "O" && val6 ==""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
else if (val7 == "O"){
if(val8 == "O" && val9==""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if(val9 == "O" && val8==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val4 == "O" && val1 == ""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
else if (val1 == "O" && val4 ==""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
else if (val9 == "O"){
if(val8 == "O" && val7==""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if(val7 == "O" && val8==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val6 == "O" && val3 == ""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if (val3 == "O" && val6 ==""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
}
/* defensive moves */
if (done == 0){
if (val1 == "X" && done==0){
if(val2 == "X" && val3==""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if(val3 == "X" && val2==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val4 == "X" && val7 == ""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if (val7 == "X" && val4 ==""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
if (val3 == "X" && done==0){
if(val2 == "X" && val1==""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
else if(val1 == "X" && val2==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val6 == "X" && val9 == ""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if (val9 == "X" && val6 ==""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
if (val7 == "X" && done==0){
if(val8 == "X" && val9==""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if(val9 == "X" && val8==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val4 == "X" && val1 == ""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
else if (val1 == "X" && val4 ==""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
if (val9 == "X" && done==0){
if(val8 == "X" && val7==""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if(val7 == "X" && val8==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val6 == "X" && val3 == ""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if (val3 == "X" && val6 ==""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
}
if (done == 0){
/* defensive moves if human has middle */
if (val1 == "X" && val9 == ""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
else if (val2 == "X" && val8 == ""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if (val3 == "X" && val7 == ""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if (val4 == "X" && val6 == ""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
else if (val5 == "X" && val5 == ""){
document.getElementById("five").value="O"; done = 1; val5 = "O"
}
else if (val6 == "X" && val4 == ""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
else if (val7 == "X" && val3 == ""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if (val8 == "X" && val2 == ""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if (val9 == "X" && val1 == ""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
}
/* comuter tries to win, but can't make a winning move, and does not have to make defensive moves */
if (done == 0){
/* check corners, if there are two free elements. math.random causes to sometimes take corner, sometimes middle */
if (Math.random() < 0.333){
if (val1 == "O"){
if(val2 == "" && val3==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val4 == "" && val7 == ""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
else if (val3 == "O"){
if(val2 == "" && val1==""){
document.getElementById("two").value="O"; done = 1; val2 = "O"
}
else if(val6 == "" && val9 == ""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
else if (val7 == "O"){
if(val8 == "" && val9==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val4 == "" && val1 == ""){
document.getElementById("four").value="O"; done = 1; val4 = "O"
}
}
else if (val9 == "O"){
if(val8 == "" && val7==""){
document.getElementById("eight").value="O"; done = 1; val8 = "O"
}
else if(val6 == "" && val3 == ""){
document.getElementById("six").value="O"; done = 1; val6 = "O"
}
}
} else {
if (val1 == "O"){
if(val2 == "" && val3==""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
else if(val4 == "" && val7 == ""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
}
else if (val3 == "O"){
if(val2 == "" && val1==""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
else if(val6 == "" && val9 == ""){
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
}
else if (val7 == "O"){
if(val8 == "" && val9==""){
document.getElementById("nine").value="O"; done = 1; val8 = "O"
}
else if(val4 == "" && val1 == ""){
document.getElementById("one").value="O"; done = 1; val1 = "O"
}
}
else if (val9 == "O"){
if(val8 == "" && val7==""){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
else if(val6 == "" && val3 == ""){
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
}
}
}
if (done == 0){
if (val2 == "O"){
if (val1 == "" && val3 == ""){
if(Math.random() < 0.5){
document.getElementById("one").value="O"; done = 1; val1 = "O"
} else {
document.getElementById("three").value="O"; done = 1; val3 = "O"
}
}
}
else if (val6 == "O"){
if (val3 == "" && val9 == ""){
if(Math.random() < 0.5){
document.getElementById("three").value="O"; done = 1; val3 = "O"
} else {
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
}
}
else if (val8 == "O"){
if (val7 == "" && val9 == ""){
if(Math.random() < 0.5){
document.getElementById("seven").value="O"; done = 1; val7 = "O"
} else {
document.getElementById("nine").value="O"; done = 1; val9 = "O"
}
}
}
else if (val4 == "O"){
if (val1 == "" && val7 == ""){
if(Math.random() < 0.5){
document.getElementById("one").value="O"; done = 1; val1 = "O"
} else {
document.getElementById("seven").value="O"; done = 1; val7 = "O"
}
}
}
}
/* go over the shullfe array in case there is no logic move */
if (done == 0){
loop = true;
shuffle(field);
do {
arrayLength = field.length;
for (i = 0; i< arrayLength; i++){
store = document.getElementById(field[i]);
if (store.value == ""){
store.value = "O";
break;
}
}
loop = false;
} while (loop == true)
}
winner(); /* call winner fucntion to see if computer has won */
if (game_progress == "done"){
document.getElementById('reset').innerHTML = "<input type='button' value='reset?' onclick='reset()' style='width: auto; height: auto;'>";
turn = 'computer';
return;
}
turn = 'player';
} /*else from if it is a tie*/
function winner(){
if(val1 !== "" && val2 !== "" && val3 !== "" && val4 !== "" && val6 !== "" && val6 !== "" && val7 !== "" && val8 !== "" && val9 !== ""){
document.getElementById("demo").innerHTML = "it is a tie";
game_progress = "done";
} else {
/* check if user has won */
if(val1 == "X" && val2 == "X" && val3 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val4 == "X" && val5 == "X" && val6 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val7 == "X" && val8 == "X" && val9 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val1 == "X" && val4 == "X" && val7 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val2 == "X" && val5 == "X" && val8 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val3 == "X" && val6 == "X" && val9 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val1 == "X" && val5 == "X" && val9 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
if(val3 == "X" && val5 == "X" && val7 == "X"){
document.getElementById("demo").innerHTML = "you won"; game_progress = "done";
}
/* check if computer has won */
if(val1 == "O" && val2 == "O" && val3 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val4 == "O" && val5 == "O" && val6 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val7 == "O" && val8 == "O" && val9 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val1 == "O" && val4 == "O" && val7 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val2 == "O" && val5 == "O" && val8 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val3 == "O" && val6 == "O" && val9 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val1 == "O" && val5 == "O" && val9 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
if(val3 == "O" && val5 == "O" && val7 == "O"){
document.getElementById("demo").innerHTML = "you lose"; game_progress = "done";
}
}
}
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex ;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
function reset(){
document.getElementById("one").value = '';
document.getElementById("two").value = '';
document.getElementById("three").value = '';
document.getElementById("four").value = '';
document.getElementById("five").value = '';
document.getElementById("six").value = '';
document.getElementById("seven").value = '';
document.getElementById("eight").value = '';
document.getElementById("nine").value = '';
turntime = 1; done = 0;
document.getElementById('reset').innerHTML = "";
document.getElementById('demo').innerHTML = "";
turn = 'player';
game_progress = "";
}
</script>
<style>
input{
height: 50px;
width: 50px;
float: left;
margin: 0 10px 10px 0;
}
body > div {
width: 220px;
}
p {
clear: left;
}
</style>
<body>
<div>
<input value="" type="button" id="one" onclick="val1 = document.getElementById('one');if(val1.value == '' && turn == 'player'){val1.value='X';myFunction()}"></input>
<input value="" type="button" id="two" onclick="val2 = document.getElementById('two');if(val2.value == '' && turn == 'player'){val2.value='X';myFunction()}"></input>
<input value="" type="button" id="three" onclick="val3 = document.getElementById('three');if(val3.value == '' && turn == 'player'){val3.value='X';myFunction()}"></input>
</div>
<div>
<input value="" type="button" id="four" onclick="val4 = document.getElementById('four');if(val4.value == '' && turn == 'player'){val4.value='X';myFunction()}"></input>
<input value="" type="button" id="five" onclick="val5 = document.getElementById('five');if(val5.value == '' && turn == 'player'){val5.value='X';myFunction()}"></input>
<input value="" type="button" id="six" onclick="val6 = document.getElementById('six');if(val6.value == '' && turn == 'player'){val6.value='X';myFunction()}"></input>
</div>
<div>
<input value="" type="button" id="seven" onclick="val7 = document.getElementById('seven');if(val7.value == '' && turn == 'player'){val7.value='X';myFunction()}"></input>
<input value="" type="button" id="eight" onclick="val8 = document.getElementById('eight');if(val8.value == '' && turn == 'player'){val8.value='X';myFunction()}"></input>
<input value="" type="button" id="nine" onclick="val9 = document.getElementById('nine');if(val9.value == '' && turn == 'player'){val9.value='X';myFunction()}"></input>
</div>
<p id="demo"></p>
<p id="reset"></p>
</body>
</html>