How to make animation run only after checkbox selection (and

W

wxdqz

New Member
Hi-

My code/page is almost exactly how I need it. But the animation runs automatically on load. I don't want it to. I want the page to load with the animation turned OFF, then if the page visitor wants they can turn it on via the checkbox.

I've tried removing the "onload = init;" but then my animation will not work, etc.

Can any of you help with this? Here is my code. Thank you again!

<HTML>
<HEAD>
<TITLE>Elastic Buttons</TITLE>



<SCRIPT LANGUAGE="JavaScript">

<!-- Begin
var nDots = 7;
var Xpos = 0;
var Ypos = 0;

var DELTAT = .01;
var SEGLEN = 10;
var SPRINGK = 10;
var MASS = 1;
var GRAVITY = 50;
var RESISTANCE = 10;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();
onload = init;
function init() {
var i = 0;
for (i = 0; i < nDots; i++) {
dots = new dot(i);
}
if (!isNetscape) {
// I only know how to read the locations of the
// <LI> items in IE
//skip this for now
// setInitPositions(dots)
}
for (i = 0; i < nDots; i++) {
dots.obj.left = dots.X;
dots.obj.top = dots.Y;
}
if (isNetscape) {
startanimate();
} else {
// let dots sit there for a few seconds
// since they're hiding on the real buttons
setTimeout("startanimate()", 0);
}
}
function dot(i) {
this.X = Xpos;
this.Y = Ypos;
this.dx = 0;
this.dy = 0;
if (isNetscape) {
this.obj = eval("document.dot" + i);
} else {
this.obj = eval("dot" + i + ".style");
}
}
function checkfirst(){
if(document.formName.checkboxName.checked) { return startanimate(); } else { return stopanimate(); }
}
function startanimate() {
timer = setInterval("animate()", 20);
for (i = 1; i < nDots; i++) { dots.obj.visibility = 'visible' }
return true;
}

function stopanimate() { clearInterval(timer);
for (i = 0; i < nDots; i++) { dots.obj.visibility = 'hidden' }
return true;
}
function setInitPositions(dots) {
var startloc = document.all.tags("LI");
var i = 0;
for (i = 0; i < startloc.length && i < (nDots - 1); i++) {
dots[i+1].X = startloc.offsetLeft
startloc.offsetParent.offsetLeft - DOTSIZE;
dots[i+1].Y = startloc.offsetTop +
startloc.offsetParent.offsetTop + 2*DOTSIZE;
}
dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}
function MoveHandler(e) {
Xpos = e.pageX;
Ypos = e.pageY;
return true;
}
function MoveHandlerIE() {
Xpos = window.event.x + document.body.scrollLeft;
Ypos = window.event.y + document.body.scrollTop;
}
if (isNetscape) {
document.captureEvents(Event.MOUSEMOVE);
document.onMouseMove = MoveHandler;
} else {
document.onmousemove = MoveHandlerIE;
}
function vec(X, Y)
{
this.X = X;
this.Y = Y;
}

// adds force in X and Y to spring for dot on dot[j]
function springForce(i, j, spring)
{
var dx = (dots.X - dots[j].X);
var dy = (dots.Y - dots[j].Y);
var len = Math.sqrt(dx*dx + dy*dy);
if (len > SEGLEN) {
var springF = SPRINGK * (len - SEGLEN);
spring.X += (dx / len) * springF;
spring.Y += (dy / len) * springF;
}
}
function animate() {
var start = 0;
if (followmouse) {
dots[0].X = Xpos;
dots[0].Y = Ypos;
start = 1;
}
for (i = start ; i < nDots; i++ ) {
var spring = new vec(0, 0);
if (i > 0) {
springForce(i-1, i, spring);
}
if (i < (nDots - 1)) {
springForce(i+1, i, spring);
}
var resist = new vec(-dots.dx * RESISTANCE, -dots.dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/ MASS, (spring.Y + resist.Y)/ MASS + GRAVITY);
dots.dx += (DELTAT * accel.X);
dots.dy += (DELTAT * accel.Y);
if (Math.abs(dots.dx) < STOPVEL &&
Math.abs(dots.dy) < STOPVEL &&
Math.abs(accel.X) < STOPACC &&
Math.abs(accel.Y) < STOPACC) {
dots.dx = 0;
dots.dy = 0;
}
dots.X += dots.dx;
dots.Y += dots.dy;
var height, width;
if (isNetscape) {
height = window.innerHeight + document.scrollTop;
width = window.innerWidth + document.scrollLeft;
} else {
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
}
if (dots.Y >= height - DOTSIZE - 1) {
if (dots.dy > 0) {
dots.dy = BOUNCE * -dots.dy;
}
dots.Y = height - DOTSIZE - 1;
}
if (dots.X >= width - DOTSIZE) {
if (dots.dx > 0) {
dots.dx = BOUNCE * -dots.dx;
}
dots.X = width - DOTSIZE - 1;
}
if (dots.X < 0) {
if (dots.dx < 0) {
dots.dx = BOUNCE * -dots.dx;
}
dots.X = 0;
}
dots.obj.left = dots.X;
dots.obj.top = dots.Y;
}
}
// End -->
</script>




</HEAD>

<BODY bgcolor="#FFFFFF" text="#000066" link="#CC6600" vlink="#CC6600" alink="#CC6600">

<div id="dot0" style="position: absolute; visibility: hidden; height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/redlittlebutton.gif" height=11 width=11></div>
<div id="dot1" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/orangelittlebutton.gif" height=11 width=11></div>
<div id="dot2" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/yellowlittlebutton.gif" height=11 width=11></div>
<div id="dot3" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/bluelittlebutton.gif" height=11 width=11></div>
<div id="dot4" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/greenlittlebutton.gif" height=11 width=11></div>
<div id="dot5" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/purplelittlebutton.gif" height=11 width=11></div>
<div id="dot6" style="position: absolute; visibility: hidden height: 11; width: 11;"><img

src="http://www.pmigroup.com/sfdc_files/images/redlittlebutton.gif" height=11 width=11></div>



<form name="formName">

Use elastic?<input type=checkbox onclick="checkfirst()" name="checkboxName"><br>

</form>


</BODY>

</HTML>
 
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