I am trying to hide an image in a script pre-loading on
the page.
Below script makes images "rain" down
the screen onClick. It functions well, but it displays
the pre-loaded image itself on
the page before
the button is clicked. I'm trying to hide
the image until
the button is pressed.
If anyone has any insight on how to hide
the image until
the function dispenseMittens() runs, I'd be eternally grateful :)
Thanks!
<script language="javascript">
var pictureSrc = 'mitten.gif'; //the location of
the mittens
var pictureWidth = 40; //the width of
the mittens
var pictureHeight = 46; //the height of
the mittens
var numFlakes = 10; //the number of mittens
var downSpeed = 0.01;
var lrFlakes = 10;
var EmergencyMittens = false;
//safety checks. Browsers will hang if this is wrong. If other values are wrong there will just be errors
if( typeof( numFlakes ) != 'number' || Math.round( numFlakes ) != numFlakes || numFlakes < 1 ) { numFlakes = 10; }
//draw
the snowflakes
for( var x = 0; x < numFlakes; x++ ) {
if( document.layers ) { //releave NS4 bug
document.write('<layer id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></layer>');
} else {
document.write('<div style="position:absolute;" id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></div>');
}
}
//calculate initial positions (in portions of browser window size)
var xcoords = new Array(), ycoords = new Array(), snFlkTemp;
for( var x = 0; x < numFlakes; x++ ) {
xcoords[x] = ( x + 1 ) / ( numFlakes + 1 );
do { snFlkTemp = Math.round( ( numFlakes - 1 ) * Math.random() );
} while( typeof( ycoords[snFlkTemp] ) == 'number' );
ycoords[snFlkTemp] = x / numFlakes;
}
//now animate
function mittensFall() {
if( !getRefToDivNest('snFlkDiv0') ) { return; }
var scrWidth = 0, scrHeight = 0, scrollHeight = 0, scrollWidth = 0;
//find screen settings for all variations. doing this every time allows for resizing and scrolling
if( typeof( window.innerWidth ) == 'number' ) { scrWidth = window.innerWidth; scrHeight = window.innerHeight; } else {
if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
scrWidth = document.documentElement.clientWidth; scrHeight = document.documentElement.clientHeight; } else {
if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
scrWidth = document.body.clientWidth; scrHeight = document.body.clientHeight; } } }
if( typeof( window.pageYOffset ) == 'number' ) { scrollHeight = pageYOffset; scrollWidth = pageXOffset; } else {
if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) { scrollHeight = document.body.scrollTop; scrollWidth = document.body.scrollLeft; } else {
if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) { scrollHeight = document.documentElement.scrollTop; scrollWidth = document.documentElement.scrollLeft; } }
}
//move
the snowflakes to their new
position
for( var x = 0; x < numFlakes; x++ ) {
if( ycoords[x] * scrHeight > scrHeight - pictureHeight ) { ycoords[x] = 0; }
var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; }
if( divRef.style ) { divRef = divRef.style; } var oPix = document.childNodes ? 'px' : 0;
divRef.top = ( Math.round( ycoords[x] * scrHeight ) + scrollHeight ) + oPix;
divRef.left = ( Math.round( ( ( xcoords[x] * scrWidth ) - ( pictureWidth / 2 ) ) + ( ( scrWidth / ( ( numFlakes + 1 ) * 4 ) ) * ( Math.sin( lrFlakes * ycoords[x] ) - Math.sin( 3 * lrFlakes * ycoords[x] ) ) ) ) + scrollWidth ) + oPix;
ycoords[x] += downSpeed;
}
}
//DHTML handlers
function getRefToDivNest(divName) {
if( document.layers ) { return document.layers[divName]; } //NS4
if( document[divName] ) { return document[divName]; } //NS4 also
if( document.getElementById ) { return document.getElementById(divName); } //DOM (IE5+, NS6+, Mozilla0.9+, Opera)
if( document.all ) { return document.all[divName]; } //Proprietary DOM - IE4
return false;
}
function dispenseMittens() {
if (EmergencyMittens) {
window.clearInterval(EmergencyMittens);
} else {
EmergencyMittens = window.setInterval('mittensFall();',100);
}
}
</script>
