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For me, the term animation brings to mind Saturday mornings as a child, being glued to the television, watching hour after hour of cartoons And actually, in terms of explaining animation in Dojo, this may be an apt metaphorThinking about cartoons will help us understand some things about animation
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A cartoon is a series of fixed images that when, presented in sequence, provide the illusion of movement or action It turns out that this is exactly the same process used by Dojo Let me give you an example A well-known web design company in Chicago, 37signals, developed a method of highlighting DOM elements whenever they changed due to an Ajax requestThe method requires that the background color of the element be changed to yellow and then the background color should slowly fade back to white (or whatever the original background color was)They called this the Yellow Fade Technique (YFT) for obvious reasons Exactly how is the effect performed We simply set the background color of the element to yellowThe following code shows how we would do this for an element whose id is div1 :
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documentgetElementById("div1")stylebackground = #FFFF00;
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To fade the background color back to the original background color, we just have to do a little math Remember that the Red/Blue/Green (RGB) color scheme used by the web consists of hexadecimal representations of each of the colors So yellow is represented in the values in Table 162
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We ll use the decimal values instead of hexadecimal So the three colors are represented by the range of numbers from 0 (no color at all) to 255 (full color) I like to think of each color as a flashlight with 256 different power settings
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It never strikes me as intuitive, but in the world of computer monitors, red and green mixed together is yellow! Let s say the original background color was white (RGB value: 255,255,255)To produce the fade, we simply need to iterate through a series of fixed values for color until we reach the value we are looking for For example, starting with the color yellow and fading back to white, we would loop through the following values for background color:
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255, 255, 0 255, 255, 1 255, 255, 2
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And so on and so on, all the way to 255, 255, 255 At each iteration we would set the new background color and pause for a bit before moving on to the next valueThink of the browser as showing us 256 distinct images, each having a different background color for the element we re working withWe ll call each image a frame (as Dojo does), and by iterating quickly through the frames, it would appear as through the background is fading from yellow to white So we might use the following code to perform out looping:
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for (i = 0; i < 256; i++) { color = "rgb('256, 256", + i + "')"; documentgetElementById("div1")stylebackground = color; }
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The problem with this code is that the frames will go by so quickly that we won t even get a chance to see them It will look like the last frame just suddenly appeared In other words, the yellow background will appear for only a few milliseconds or not at all Also while the JavaScript is performing the loop, no other code execution is possible This could be a more serious problem when we use a different property that might include many more iterations Using a special JavaScript function called setTimeOut can solve both these problems It allows us to specify a function to be executed and a delay before that function is run This allows other JavaScript to run while the browser is waiting for the time-out function to run againWe ll modify our code to use this new function:
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var FADE_BLUE = 0; function yellowFade() { el = documentgetElementById("fade_target"); color = "rgb("255, 255, " + FADE_BLUE + ")"; FADE_BLUE = FADE_BLUE + 1; elstylebackground = color; if (FADE_BLUE >= 256) { return;