Tuesday, September 30th, 2008
Dojo Fishtank
Category: Dojo
Blaine Ehrhart wrote a fun little fish tank using Dojo, as another example of doing animation using JavaScript, which includes the following to give you a taste:
JAVASCRIPT:
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function playBubble (target,newbubble) {
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var top = parseInt(target.style.top);
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var left = parseInt(target.style.left);
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var rand = 50+Math.round(50*Math.random());
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// Here we detect how far up the page the bubble is so we can fade it out with the dojo.fadeOut function and delete it
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if (top <= 150) {
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var fadeOut = dojo.fadeOut({
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node: target,
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duration: 200,
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onEnd: function(){dojo._destroyElement(target);}
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});
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fadeOut.play();
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return true;
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}
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// If it's a new bubble then we want to setup it's bubble sequence to go up
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if (newbubble == 1) {
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var floatUp = dojo.fx.slideTo({
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node: target,
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duration: 10000,
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properties: {
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top: {
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end:"-200",
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unit:"px"
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}
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}
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});
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floatUp.play();
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}
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// After many random variables are used you get a very bubbly effect when using dojo.fx.slideTo
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var bubbleEffect = dojo.fx.slideTo({
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node: target,
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duration: 1000,
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properties: {
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left: {
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end:(left%2)?(left-rand):(left+rand),
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unit:"px"
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}
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},
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onEnd: function(){playBubble(target);}
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});
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bubbleEffect.play();
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return true;
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}
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3.6 rating from 23 votes
Ah sure, you don’t need flash as long as your animation is extremely simple. Let’s see how much JavaScript it taks to create a character with a smooth animated walk cycle and a multi-layer scrolling background. After you crash every browser except maybe chrome, try the same thing in Flash and see how simple it is.