The following code is used here to randomly pick a number in a bingo game. It works fine in IE but in Firefox it displays "undefined" for the number just drawn. When I placed an alert after the line:
var r = Math.floor(Math.random() * j); // Pick one from those remaining
to display r, I got "NaN". The genform() function worked fine though.
TIA
<script language="JavaScript">
var deck = new Array(75);
var history = "";
var j;
function genform() {
for (var i=0; i < 75;i++) {
document.bingo.elements[i].value = formatR(i + 1);
document.bingo.elements[i].style.color = "#cacaca";
document.bingo.elements[i].style.backgroundColor = "#ffffff";
deck[i] = i + 1;
}
document.bingo.lastcalled.value = "";
document.bingo.history.value = "";
history = "";
j = 74;
}
function callone() {
var bingolit = [ "B", "I", "N", "G", "O"] ;
if (j < 0) {
alert("No more numbers to draw");
return 1;
}
var r = Math.floor(Math.random() * j); // Pick one from those remaining
var drawn = deck[r];
deck[r] = deck[j]; // Move last of those remaining to slot just chosen
if (j <74) {
if (history.length > 0) history+= "\n";
// history += document.bingo.lastcalled.value;
history = document.bingo.lastcalled.value + "\n" + history;
document.bingo.history.value = history;
}
document.bingo.lastcalled.value = bingolit[Math.floor((drawn-1)/15)] + ' ' + drawn;
document.bingo.elements[drawn - 1].style.color = "#000000";
document.bingo.elements[drawn - 1].style.backgroundColor = "#ffff00";
j--;
}
function formatR (x) { if (x < 10) return ' ' + x; else return x;} //Right justify
