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Kor
05-24-2004, 12:44 PM
I have wrote this for a friend in another forum, But I thought it might be useful, at least for start for similar apllication.

Tho code scrolles the page if mouse moves in the 1/3 zones (left, right, up, down) of the page (clientWidth/Height). It might be modify (a better ideea, since I don't like scrolled full pages - at least the X-scrolled) for scrollable frames, iframes or layers). I would be grateful if any comments will simplify he code or will help me to build a similar application based on simple position of the mouse (not only on mousemove)


<html>
<head>
<script>
function setUp() {
if( typeof( window.innerWidth ) == 'number' ) {
/* Non-IE */
winW = window.innerWidth;
winH = window.innerHeight;
} else if( document.documentElement &&
( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
/* IE 6+ in 'standards compliant mode' */
winW = document.documentElement.clientWidth;
winH = document.documentElement.clientHeight;
} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
/*IE 4 compatible*/
winW = document.body.clientWidth;
winH = document.body.clientHeight;
}
setL = winW/3;// zone left first 1/3 from client width
setR = winW*2/3;// zone right third 1/3 from client width
setU = winH/3;// zone up first 1/3 from client height
setD = winH*2/3;// zone down third 1/3 from client width
pix=4// scroll speed control pixels/mousemove
}
function checkS(e){
// capture the mouse position
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY)
{
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY)
{
posx = e.clientX;
posy = e.clientY;
}
// initialize the scrollBy parameters
x=0;
y=0;
// set the new scrollBy parameters
if(posx<setL){
x=-pix;
}
if(posx>setR){
x=pix;
}
if(posy<setU){
y=-pix;
}
if(posy>setD){
y=pix;
}
// scroll
window.scrollBy(x,y);
}
</script>
</head>
<body onload="setUp()" onmousemove="checkS(event)">
<table width="1200" height="900" border="0" cellpadding="0" cellspacing="0">
<tr>
<td align="center" valign="middle" bgcolor="#CCCCCC">blabla</td>
</tr>
</table>
</body>
</html>
Garadon
05-25-2004, 09:29 AM
Just a few comments:

1. you need to recalc the zones on browser resizing.
2. Don't know if you realized this but if the document is to big compared to the window size you method of scrolling requires you move the mouse up and down in the up down zones to get to the top or bottom and same goes for the left rigth zones.
3. I would advise against using the mouse position to scroll, simply cause experience tells me it will be hard for the user to control the scrolling but an idea to do it on is to used onmousemove to launch an settimeout or setInterval function, this would work in theory since the mouse position only changes onmousemove, you would of cause need to clear the settimeout or interval on each new mousemove.
Kor
05-25-2004, 11:58 AM
thanx for the comments

1. yes, I'll insert an onresize event handler too.
2. maybe onmousedown would be a better handler?
3. yes. good ideea with setInterval (or setTimeout)
Kor
05-25-2004, 12:55 PM
according your notes, the code looks now like:


<html>
<head>
<script>
function setUp() {
if( typeof( window.innerWidth ) == 'number' ) {
/* Non-IE */
winW = window.innerWidth;
winH = window.innerHeight;
} else if( document.documentElement &&
( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
/* IE 6+ in 'standards compliant mode' */
winW = document.documentElement.clientWidth;
winH = document.documentElement.clientHeight;
} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
/*IE 4 compatible*/
winW = document.body.clientWidth;
winH = document.body.clientHeight;
}
setL = winW/3;// zone left first 1/3 from client width
setR = winW*2/3;// zone right third 1/3 from client width
setU = winH/3;// zone up first 1/3 from client height
setD = winH*2/3;// zone down third 1/3 from client width
pix=1// scroll speed control, in pixels/mousemove
time=20// scroll speed control time setTimeout, in milliseconds
}
function checkS(e){
// capture the mouse position
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY)
{
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY)
{
posx = e.clientX;
posy = e.clientY;
}
// initialize the scrollBy parameters
x=0;
y=0;
// set the new scrollBy parameters
if(posx<setL){
x=-pix;
}
if(posx>setR){
x=pix;
}
if(posy<setU){
y=-pix;
}
if(posy>setD){
y=pix;
}
scro();
}
function scro(){
window.scrollBy(x,y);
zz=setTimeout('scro()',20)
}
function clearT(){
clearTimeout(zz)
}
</script>
</head>
<body onload="setUp()" onresize="setUp()" onmousedown="checkS(event)" onmouseup="clearT()">
<table width="1200" height="900" border="0" cellpadding="0" cellspacing="0">
<tr>
<td align="center" valign="middle" bgcolor="#CCCCCC">blabla</td>
</tr>
</table>
</body>
</html>