Snow Falling JS

Developer
Boyd Massie
Size
7,771 Kb
Views
38,456
  1. Snow Falling JS Previews
  2. Snow Falling JS HTML Codes
  3. Snow Falling JS CSS Codes
  4. Snow Falling JS JS Codes

How do I make an snow falling js?

A very cool falling snow animation using JavaScript. Source: http://www.schillmania.com/projects/snowstorm/. What is a snow falling js? How do you make a snow falling js? This script and codes were developed by Boyd Massie on 28 November 2022, Monday.

Snow Falling JS Previews
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Snow Falling JS - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Snow Falling JS</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <script src="js/index.js"></script>
</body>
</html>

Snow Falling JS - Script Codes CSS Codes

body { background:#000000;
}

Snow Falling JS - Script Codes JS Codes

/** @license * DHTML Snowstorm! JavaScript-based snow for web pages * Making it snow on the internets since 2003. You're welcome. * ----------------------------------------------------------- * Version 1.44.20131208 (Previous rev: 1.44.20131125) * Copyright (c) 2007, Scott Schiller. All rights reserved. * Code provided under the BSD License * http://schillmania.com/projects/snowstorm/license.txt */
/*jslint nomen: true, plusplus: true, sloppy: true, vars: true, white: true */
/*global window, document, navigator, clearInterval, setInterval */
var snowStorm = (function(window, document) { // --- common properties --- this.autoStart = true; // Whether the snow should start automatically or not. this.excludeMobile = true; // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) Enable at your own risk. this.flakesMax = 128; // Limit total amount of snow made (falling + sticking) this.flakesMaxActive = 64; // Limit amount of snow falling at once (less = lower CPU use) this.animationInterval = 50; // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower this.useGPU = true; // Enable transform-based hardware acceleration, reduce CPU load. this.className = null; // CSS class name for further customization on snow elements this.excludeMobile = true; // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) By default, be nice. this.flakeBottom = null; // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect this.followMouse = false; // Snow movement can respond to the user's mouse this.snowColor = '#fff'; // Don't eat (or use?) yellow snow. this.snowCharacter = '&bull;'; // &bull; = bullet, &middot; is square on some systems etc. this.snowStick = true; // Whether or not snow should "stick" at the bottom. When off, will never collect. this.targetElement = null; // element which snow will be appended to (null = document.body) - can be an element ID eg. 'myDiv', or a DOM node reference this.useMeltEffect = true; // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it this.useTwinkleEffect = false; // Allow snow to randomly "flicker" in and out of view while falling this.usePositionFixed = false; // true = snow does not shift vertically when scrolling. May increase CPU load, disabled by default - if enabled, used only where supported this.usePixelPosition = false; // Whether to use pixel values for snow top/left vs. percentages. Auto-enabled if body is position:relative or targetElement is specified. // --- less-used bits --- this.freezeOnBlur = true; // Only snow when the window is in focus (foreground.) Saves CPU. this.flakeLeftOffset = 0; // Left margin/gutter space on edge of container (eg. browser window.) Bump up these values if seeing horizontal scrollbars. this.flakeRightOffset = 0; // Right margin/gutter space on edge of container this.flakeWidth = 8; // Max pixel width reserved for snow element this.flakeHeight = 8; // Max pixel height reserved for snow element this.vMaxX = 5; // Maximum X velocity range for snow this.vMaxY = 4; // Maximum Y velocity range for snow this.zIndex = 0; // CSS stacking order applied to each snowflake // --- "No user-serviceable parts inside" past this point, yadda yadda --- var storm = this, features, // UA sniffing and backCompat rendering mode checks for fixed position, etc. isIE = navigator.userAgent.match(/msie/i), isIE6 = navigator.userAgent.match(/msie 6/i), isMobile = navigator.userAgent.match(/mobile|opera m(ob|in)/i), isBackCompatIE = (isIE && document.compatMode === 'BackCompat'), noFixed = (isBackCompatIE || isIE6), screenX = null, screenX2 = null, screenY = null, scrollY = null, docHeight = null, vRndX = null, vRndY = null, windOffset = 1, windMultiplier = 2, flakeTypes = 6, fixedForEverything = false, targetElementIsRelative = false, opacitySupported = (function(){ try { document.createElement('div').style.opacity = '0.5'; } catch(e) { return false; } return true; }()), didInit = false, docFrag = document.createDocumentFragment(); features = (function() { var getAnimationFrame; /** * hat tip: paul irish * http://paulirish.com/2011/requestanimationframe-for-smart-animating/ * https://gist.github.com/838785 */ function timeoutShim(callback) { window.setTimeout(callback, 1000/(storm.animationInterval || 20)); } var _animationFrame = (window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || timeoutShim); // apply to window, avoid "illegal invocation" errors in Chrome getAnimationFrame = _animationFrame ? function() { return _animationFrame.apply(window, arguments); } : null; var testDiv; testDiv = document.createElement('div'); function has(prop) { // test for feature support var result = testDiv.style[prop]; return (result !== undefined ? prop : null); } // note local scope. var localFeatures = { transform: { ie: has('-ms-transform'), moz: has('MozTransform'), opera: has('OTransform'), webkit: has('webkitTransform'), w3: has('transform'), prop: null // the normalized property value }, getAnimationFrame: getAnimationFrame }; localFeatures.transform.prop = ( localFeatures.transform.w3 || localFeatures.transform.moz || localFeatures.transform.webkit || localFeatures.transform.ie || localFeatures.transform.opera ); testDiv = null; return localFeatures; }()); this.timer = null; this.flakes = []; this.disabled = false; this.active = false; this.meltFrameCount = 20; this.meltFrames = []; this.setXY = function(o, x, y) { if (!o) { return false; } if (storm.usePixelPosition || targetElementIsRelative) { o.style.left = (x - storm.flakeWidth) + 'px'; o.style.top = (y - storm.flakeHeight) + 'px'; } else if (noFixed) { o.style.right = (100-(x/screenX*100)) + '%'; // avoid creating vertical scrollbars o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px'; } else { if (!storm.flakeBottom) { // if not using a fixed bottom coordinate... o.style.right = (100-(x/screenX*100)) + '%'; o.style.bottom = (100-(y/screenY*100)) + '%'; } else { // absolute top. o.style.right = (100-(x/screenX*100)) + '%'; o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px'; } } }; this.events = (function() { var old = (!window.addEventListener && window.attachEvent), slice = Array.prototype.slice, evt = { add: (old?'attachEvent':'addEventListener'), remove: (old?'detachEvent':'removeEventListener') }; function getArgs(oArgs) { var args = slice.call(oArgs), len = args.length; if (old) { args[1] = 'on' + args[1]; // prefix if (len > 3) { args.pop(); // no capture } } else if (len === 3) { args.push(false); } return args; } function apply(args, sType) { var element = args.shift(), method = [evt[sType]]; if (old) { element[method](args[0], args[1]); } else { element[method].apply(element, args); } } function addEvent() { apply(getArgs(arguments), 'add'); } function removeEvent() { apply(getArgs(arguments), 'remove'); } return { add: addEvent, remove: removeEvent }; }()); function rnd(n,min) { if (isNaN(min)) { min = 0; } return (Math.random()*n)+min; } function plusMinus(n) { return (parseInt(rnd(2),10)===1?n*-1:n); } this.randomizeWind = function() { var i; vRndX = plusMinus(rnd(storm.vMaxX,0.2)); vRndY = rnd(storm.vMaxY,0.2); if (this.flakes) { for (i=0; i<this.flakes.length; i++) { if (this.flakes[i].active) { this.flakes[i].setVelocities(); } } } }; this.scrollHandler = function() { var i; // "attach" snowflakes to bottom of window if no absolute bottom value was given scrollY = (storm.flakeBottom ? 0 : parseInt(window.scrollY || document.documentElement.scrollTop || (noFixed ? document.body.scrollTop : 0), 10)); if (isNaN(scrollY)) { scrollY = 0; // Netscape 6 scroll fix } if (!fixedForEverything && !storm.flakeBottom && storm.flakes) { for (i=0; i<storm.flakes.length; i++) { if (storm.flakes[i].active === 0) { storm.flakes[i].stick(); } } } }; this.resizeHandler = function() { if (window.innerWidth || window.innerHeight) { screenX = window.innerWidth - 16 - storm.flakeRightOffset; screenY = (storm.flakeBottom || window.innerHeight); } else { screenX = (document.documentElement.clientWidth || document.body.clientWidth || document.body.scrollWidth) - (!isIE ? 8 : 0) - storm.flakeRightOffset; screenY = storm.flakeBottom || document.documentElement.clientHeight || document.body.clientHeight || document.body.scrollHeight; } docHeight = document.body.offsetHeight; screenX2 = parseInt(screenX/2,10); }; this.resizeHandlerAlt = function() { screenX = storm.targetElement.offsetWidth - storm.flakeRightOffset; screenY = storm.flakeBottom || storm.targetElement.offsetHeight; screenX2 = parseInt(screenX/2,10); docHeight = document.body.offsetHeight; }; this.freeze = function() { // pause animation if (!storm.disabled) { storm.disabled = 1; } else { return false; } storm.timer = null; }; this.resume = function() { if (storm.disabled) { storm.disabled = 0; } else { return false; } storm.timerInit(); }; this.toggleSnow = function() { if (!storm.flakes.length) { // first run storm.start(); } else { storm.active = !storm.active; if (storm.active) { storm.show(); storm.resume(); } else { storm.stop(); storm.freeze(); } } }; this.stop = function() { var i; this.freeze(); for (i=0; i<this.flakes.length; i++) { this.flakes[i].o.style.display = 'none'; } storm.events.remove(window,'scroll',storm.scrollHandler); storm.events.remove(window,'resize',storm.resizeHandler); if (storm.freezeOnBlur) { if (isIE) { storm.events.remove(document,'focusout',storm.freeze); storm.events.remove(document,'focusin',storm.resume); } else { storm.events.remove(window,'blur',storm.freeze); storm.events.remove(window,'focus',storm.resume); } } }; this.show = function() { var i; for (i=0; i<this.flakes.length; i++) { this.flakes[i].o.style.display = 'block'; } }; this.SnowFlake = function(type,x,y) { var s = this; this.type = type; this.x = x||parseInt(rnd(screenX-20),10); this.y = (!isNaN(y)?y:-rnd(screenY)-12); this.vX = null; this.vY = null; this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type) this.vAmp = this.vAmpTypes[this.type] || 1; this.melting = false; this.meltFrameCount = storm.meltFrameCount; this.meltFrames = storm.meltFrames; this.meltFrame = 0; this.twinkleFrame = 0; this.active = 1; this.fontSize = (10+(this.type/5)*10); this.o = document.createElement('div'); this.o.innerHTML = storm.snowCharacter; if (storm.className) { this.o.setAttribute('class', storm.className); } this.o.style.color = storm.snowColor; this.o.style.position = (fixedForEverything?'fixed':'absolute'); if (storm.useGPU && features.transform.prop) { // GPU-accelerated snow. this.o.style[features.transform.prop] = 'translate3d(0px, 0px, 0px)'; } this.o.style.width = storm.flakeWidth+'px'; this.o.style.height = storm.flakeHeight+'px'; this.o.style.fontFamily = 'arial,verdana'; this.o.style.cursor = 'default'; this.o.style.overflow = 'hidden'; this.o.style.fontWeight = 'normal'; this.o.style.zIndex = storm.zIndex; docFrag.appendChild(this.o); this.refresh = function() { if (isNaN(s.x) || isNaN(s.y)) { // safety check return false; } storm.setXY(s.o, s.x, s.y); }; this.stick = function() { if (noFixed || (storm.targetElement !== document.documentElement && storm.targetElement !== document.body)) { s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px'; } else if (storm.flakeBottom) { s.o.style.top = storm.flakeBottom+'px'; } else { s.o.style.display = 'none'; s.o.style.bottom = '0%'; s.o.style.position = 'fixed'; s.o.style.display = 'block'; } }; this.vCheck = function() { if (s.vX>=0 && s.vX<0.2) { s.vX = 0.2; } else if (s.vX<0 && s.vX>-0.2) { s.vX = -0.2; } if (s.vY>=0 && s.vY<0.2) { s.vY = 0.2; } }; this.move = function() { var vX = s.vX*windOffset, yDiff; s.x += vX; s.y += (s.vY*s.vAmp); if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check s.x = 0; } else if (vX < 0 && s.x-storm.flakeLeftOffset < -storm.flakeWidth) { s.x = screenX-storm.flakeWidth-1; // flakeWidth; } s.refresh(); yDiff = screenY+scrollY-s.y+storm.flakeHeight; if (yDiff<storm.flakeHeight) { s.active = 0; if (storm.snowStick) { s.stick(); } else { s.recycle(); } } else { if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) { // ~1/1000 chance of melting mid-air, with each frame s.melting = true; s.melt(); // only incrementally melt one frame // s.melting = false; } if (storm.useTwinkleEffect) { if (s.twinkleFrame < 0) { if (Math.random() > 0.97) { s.twinkleFrame = parseInt(Math.random() * 8, 10); } } else { s.twinkleFrame--; if (!opacitySupported) { s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 'hidden' : 'visible'); } else { s.o.style.opacity = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 0 : 1); } } } } }; this.animate = function() { // main animation loop // move, check status, die etc. s.move(); }; this.setVelocities = function() { s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1); s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1); }; this.setOpacity = function(o,opacity) { if (!opacitySupported) { return false; } o.style.opacity = opacity; }; this.melt = function() { if (!storm.useMeltEffect || !s.melting) { s.recycle(); } else { if (s.meltFrame < s.meltFrameCount) { s.setOpacity(s.o,s.meltFrames[s.meltFrame]); s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px'; s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px'; s.meltFrame++; } else { s.recycle(); } } }; this.recycle = function() { s.o.style.display = 'none'; s.o.style.position = (fixedForEverything?'fixed':'absolute'); s.o.style.bottom = 'auto'; s.setVelocities(); s.vCheck(); s.meltFrame = 0; s.melting = false; s.setOpacity(s.o,1); s.o.style.padding = '0px'; s.o.style.margin = '0px'; s.o.style.fontSize = s.fontSize+'px'; s.o.style.lineHeight = (storm.flakeHeight+2)+'px'; s.o.style.textAlign = 'center'; s.o.style.verticalAlign = 'baseline'; s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10); s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight; s.refresh(); s.o.style.display = 'block'; s.active = 1; }; this.recycle(); // set up x/y coords etc. this.refresh(); }; this.snow = function() { var active = 0, flake = null, i, j; for (i=0, j=storm.flakes.length; i<j; i++) { if (storm.flakes[i].active === 1) { storm.flakes[i].move(); active++; } if (storm.flakes[i].melting) { storm.flakes[i].melt(); } } if (active<storm.flakesMaxActive) { flake = storm.flakes[parseInt(rnd(storm.flakes.length),10)]; if (flake.active === 0) { flake.melting = true; } } if (storm.timer) { features.getAnimationFrame(storm.snow); } }; this.mouseMove = function(e) { if (!storm.followMouse) { return true; } var x = parseInt(e.clientX,10); if (x<screenX2) { windOffset = -windMultiplier+(x/screenX2*windMultiplier); } else { x -= screenX2; windOffset = (x/screenX2)*windMultiplier; } }; this.createSnow = function(limit,allowInactive) { var i; for (i=0; i<limit; i++) { storm.flakes[storm.flakes.length] = new storm.SnowFlake(parseInt(rnd(flakeTypes),10)); if (allowInactive || i>storm.flakesMaxActive) { storm.flakes[storm.flakes.length-1].active = -1; } } storm.targetElement.appendChild(docFrag); }; this.timerInit = function() { storm.timer = true; storm.snow(); }; this.init = function() { var i; for (i=0; i<storm.meltFrameCount; i++) { storm.meltFrames.push(1-(i/storm.meltFrameCount)); } storm.randomizeWind(); storm.createSnow(storm.flakesMax); // create initial batch storm.events.add(window,'resize',storm.resizeHandler); storm.events.add(window,'scroll',storm.scrollHandler); if (storm.freezeOnBlur) { if (isIE) { storm.events.add(document,'focusout',storm.freeze); storm.events.add(document,'focusin',storm.resume); } else { storm.events.add(window,'blur',storm.freeze); storm.events.add(window,'focus',storm.resume); } } storm.resizeHandler(); storm.scrollHandler(); if (storm.followMouse) { storm.events.add(isIE?document:window,'mousemove',storm.mouseMove); } storm.animationInterval = Math.max(20,storm.animationInterval); storm.timerInit(); }; this.start = function(bFromOnLoad) { if (!didInit) { didInit = true; } else if (bFromOnLoad) { // already loaded and running return true; } if (typeof storm.targetElement === 'string') { var targetID = storm.targetElement; storm.targetElement = document.getElementById(targetID); if (!storm.targetElement) { throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"'); } } if (!storm.targetElement) { storm.targetElement = (document.body || document.documentElement); } if (storm.targetElement !== document.documentElement && storm.targetElement !== document.body) { // re-map handler to get element instead of screen dimensions storm.resizeHandler = storm.resizeHandlerAlt; //and force-enable pixel positioning storm.usePixelPosition = true; } storm.resizeHandler(); // get bounding box elements storm.usePositionFixed = (storm.usePositionFixed && !noFixed && !storm.flakeBottom); // whether or not position:fixed is to be used if (window.getComputedStyle) { // attempt to determine if body or user-specified snow parent element is relatlively-positioned. try { targetElementIsRelative = (window.getComputedStyle(storm.targetElement, null).getPropertyValue('position') === 'relative'); } catch(e) { // oh well targetElementIsRelative = false; } } fixedForEverything = storm.usePositionFixed; if (screenX && screenY && !storm.disabled) { storm.init(); storm.active = true; } }; function doDelayedStart() { window.setTimeout(function() { storm.start(true); }, 20); // event cleanup storm.events.remove(isIE?document:window,'mousemove',doDelayedStart); } function doStart() { if (!storm.excludeMobile || !isMobile) { doDelayedStart(); } // event cleanup storm.events.remove(window, 'load', doStart); } // hooks for starting the snow if (storm.autoStart) { storm.events.add(window, 'load', doStart, false); } return this;
}(window, document));
Snow Falling JS - Script Codes
Snow Falling JS - Script Codes
Home Page Home
Developer Boyd Massie
Username massiebn
Uploaded November 28, 2022
Rating 3.5
Size 7,771 Kb
Views 38,456
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