Javascript Snowing Effect Script
By Brian on Dec 11, 2009 with Comments 0
Here is a nice feature to add to your web pages during the holiday season. Falling snowflakes are very simple and yet a great eye catcher to new visitors to your website.
Here is the snowflake gif I made for this:
Now, to make the effect of the snowflake falling on the webpage we will just use javascript. You want to place this code in the <head> tags of your webpage and it will give you the pretty effect that it is snowing! You can do this with other seasons as well like autumn, you would want to use a leaf of some kind. Here is the code:
<script type="text/javascript">
// Path to your snowflake image. If in same folder just the title of the image, otherwise put './folder/imagetitle.ext' ex: ./images/snowflake.gif.
var snowimg = "snowflake.gif";
// Number of snowflakes you want to render on the page.
var num = 12;
var ie4up = (document.all) ? 1 : 0;
var ns6up = (document.getElementById&amp;&amp;!document.all) ? 1 : 0;
function iecom(){
return (document.compatMode &amp;&amp; document.compatMode!="BackCompat")? document.documentElement : document.body
}
var dx, xp, yp; // coordinate, positions
var am, stx, sty; // amplitude, steps
var i;
var doc_width = 800;
doc_height = 600;
if (ns6up) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
} else if (ie4up) {
doc_width = iecom().clientWidth;
doc_height = iecom().clientHeight;
}
dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
for (i = 0; i < num; ++ i) {
dx[i] = 0; // set coordinate variables
xp[i] = Math.random()*(doc_width-50); // set position variables
yp[i] = Math.random()*doc_height;
am[i] = Math.random()*20; // set amplitude variables
stx[i] = 0.02 + Math.random()/10; // set step variables
sty[i] = 0.7 + Math.random(); // set step variables
if (ie4up||ns6up) {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
}
}
function snowIE_NS6() { // IE and NS6 main animation function
doc_width = ns6up?window.innerWidth-10 : iecompattest().clientWidth-10;
doc_height=(window.innerHeight &amp;&amp; snowdistance=="windowheight")? window.innerHeight : (ie4up &amp;&amp; snowdistance=="windowheight")? iecompattest().clientHeight : (ie4up &amp;&amp; !window.opera &amp;&amp; snowdistance=="pageheight")? iecompattest().scrollHeight : iecompattest().offsetHeight;
for (i = 0; i < no; ++ i) { // iterate for every dot
yp[i] += sty[i];
if (yp[i] > doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
}
dx[i] += stx[i];
document.getElementById("dot"+i).style.top=yp[i]+"px";
document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i])+"px";
}
snowtimer=setTimeout("snowIE_NS6()", 10);
}
function hidesnow(){
if (window.snowtimer) clearTimeout(snowtimer)
for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="hidden"
}
if (ie4up||ns6up){
snowIE_NS6();
if (hidesnowtime>0)
setTimeout("hidesnow()", hidesnowtime*1000)
}
</script>
Enjoy!
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