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Question

Answer 1

A:

Change

<body onkeydown="handleArrowKeys(event)">

To

<body onkeydown="processArrowKeys(event)">

Not sure how it works in firefox and chrome since there is no handleArrowKeys function.

Joel Potter 2009-07-26 23:05:59

that would be a typo in the question...

Jcubed 2009-07-26 23:57:52

Answer 2

A:

Try the following:

/* ... */
function processArrowKeys(E) {
    if (!E) E = window.event;
/* ... */

Blixt 2009-07-26 23:29:37

Answer 3

+1 A:

This should work out:

 onload = function() {
    var body = document.body,
    personX = 18,
    personY = 13;

    body.onkeydown = function( E ) {
    E = E || window.event;

    if (E.keyCode == 37 || E.keyCode == 38 || E.keyCode == 39 || E.keyCode==40) {
        if ( E.preventDefault ) {
     E.preventDefault();
        } else {
     E.returnValue = false;
        }
    }

    if (E.keyCode == 37) {
        if (currentterrain[personX - 1][personY] == 0 || currentterrain[personX - 1][personY] == 1 || currentterrain[personX - 1][personY] == 3) {
     personX--;
        }
    }
    if (E.keyCode == 39) {
        if (currentterrain[personX + 1][personY] == 0 || currentterrain[personX + 1][personY] == 1 || currentterrain[personX + 1][personY] == 3) {
     personX++;
        }
    }
    if (E.keyCode == 38) {
        for (i = 0; i < 3; i++) {
     if (currentterrain[personX][personY - 1] == 0 || currentterrain[personX][personY - 1] == 1 || currentterrain[personX][personY - 1] == 3) {
         personY--;
     }
        }
    }

    }
}

meder 2009-07-26 23:41:16

where do i put that in the code?

Jcubed 2009-07-27 00:03:05

Place this inside the <script> anywhere. The main issue is that you're trying to invoke preventDefault which doesn't exist in IE, event.returnValue=false is the alternative.

meder 2009-07-27 00:50:20

Answer 4

+2 A:

changing this line fixed it:

if(E.keyCode==37||E.keyCode==38||E.keyCode==39||E.keyCode==40){if(navigator.appName!="Microsoft Internet Explorer"){E.preventDefault();}}

IE must not work with preventDefault()

Jcubed 2009-07-27 00:48:04

That's what I basically did in my reworked code example. IE supports returnValue = false.

meder 2009-07-27 00:52:03

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JavaScript keydown error in IE

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