Created
December 11, 2009 01:45
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// SELECTING JQUERY COOKBOOK WINNERS | |
var RandomNumberGen = (function(){ | |
// Random num generator | |
// Never returns the same number twice | |
function RandomNumberGen(min, max) { | |
this.used = {}; | |
this.min = min || 0; | |
this.max = max || 9999999; | |
} | |
RandomNumberGen.prototype.gen = function() { | |
var i, attempts = 0, | |
max = this.max, | |
min = this.min, | |
used = this.used; | |
while ( used[i = Math.floor(Math.random() * (max - min + 1) + min)] ) { | |
if ( attempts++ > max-min ) { | |
return null; | |
} | |
} | |
used[i] = true; | |
return i; | |
}; | |
RandomNumberGen.prototype.avoid = function(n) { | |
return this.used[n] = true; | |
}; | |
return RandomNumberGen; | |
})(); | |
var randomCommentGen = new RandomNumberGen(0, 255), | |
numberOfBooks = 5, | |
comments = jQuery('.commentlist li'); | |
randomCommentGen.avoid(7); // A comment from me | |
randomCommentGen.avoid(255); // Another comment from me | |
for (var i = 0; i < numberOfBooks; ++i) { | |
var rand = randomCommentGen.gen(); | |
if ( rand !== null ) { | |
comments.eq( rand ).css({ | |
// Highlight winner | |
backgroundColor: 'yellow', | |
color: 'red', | |
fontWeight: 700 | |
}); | |
} | |
} |
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