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| var Starboxes = {
// Configuration for all starboxes
inverse: false,
locked: false,
onRate: Prototype.emptyFunction,
overlayImages: '../images/starbox/', // relative to starbox.js
overlay: 'default.png',
rerate: false,
REQUIRED_Prototype: '1.6.0',
REQUIRED_Scriptaculous: '1.8.0',
load: function() {
this.require('Prototype');
var srcMatch = /starbox\.js$/;
this.imageSource = (($$("head script[src]").find(function(s) {
return s.src.match(srcMatch);
}) || {}).src || '').replace(srcMatch, '') + this.overlayImages;
},
require: function(library) {
if ((typeof window[library] == 'undefined') ||
(this.convertVersionString(window[library].Version) < this.convertVersionString(this['REQUIRED_' + library])))
throw('Starbox requires ' + library + ' >= ' + this['REQUIRED_' + library]);
},
convertVersionString: function(versionString) {
var r = versionString.split('.');
return parseInt(r[0])*100000 + parseInt(r[1])*1000 + parseInt(r[2]);
},
fixIE: (function(agent) {
var version = new RegExp('MSIE ([\\d.]+)').exec(agent);
return version ? (parseFloat(version[1]) <= 6) : false;
})(navigator.userAgent),
imagecache: [],
cacheImage: function(imageInfo) {
if(!this.getCachedImage(imageInfo.src)) this.imagecache.push(imageInfo);
return imageInfo;
},
getCachedImage: function(src) {
return this.imagecache.find(function(imageInfo) { return imageInfo.src == src });
},
// speed up the initial load of the page by building in batches
// images are cached to to minimize requests
buildQueue: [],
queueBuild: function(starbox) {
this.buildQueue.push(starbox);
},
processBuildQueue: function() {
// on empty queue, stop loading as batches
if (!this.buildQueue[0]) { this.batchLoading = true; return; }
this.cacheBuildBatch(this.buildQueue[0]);
},
cacheBuildBatch: function(starbox) {
var set = [];
var overlay = starbox.options.overlay;
var imageInfo = this.getCachedImage(overlay);
// create a batch based on images with the same overlay
this.buildQueue.each(function(s) {
if (s.options.overlay == overlay) {
set.push(s);
this.buildQueue = this.buildQueue.without(s);
}
}.bind(this));
if (!imageInfo) {
var starImage = new Image();
starImage.onload=function() {
var imageInfo = this.cacheImage({ src: overlay, height: starImage.height,
width: starImage.width, fullsrc: starImage.src });
this.buildBatch(set, imageInfo);
}.bind(this);
starImage.src = Starboxes.imageSource + overlay;
}
else { this.buildBatch(set, imageInfo); }
},
buildBatch: function(set, imageInfo) {
set.each(function(s) {
s.imageInfo = imageInfo;
s.build();
});
this.processBuildQueue();
}
};
Starboxes.load();
document.observe('dom:loaded', Starboxes.processBuildQueue.bind(Starboxes));
var Starbox = Class.create({
initialize: function(element, average) {
this.element = $(element),
this.average = average;
this.options = Object.extend({
buttons: 5,
className : 'default',
color: false,
duration: 0.6,
effect: { mouseover: false , mouseout: (window.Effect && Effect.Morph) },
hoverColor: false,
hoverClass: 'hover',
ghostColor: false,
ghosting: false,
ratedClass: 'rated',
identity: false,
indicator: false,
inverse: Starboxes.inverse,
locked: false,
max: 5,
onRate: Starboxes.onRate,
rerate: Starboxes.rerate,
rated: false,
overlay: Starboxes.overlay,
stars: 5,
total : 0
}, arguments[2] || {});
this.rated = this.options.rated;
this.total = this.options.total;
this.locked = this.options.locked || (this.rated && !this.options.rerate);
if (this.options.effect && (this.options.effect.mouseover || this.options.effect.mouseout))
Starboxes.require('Scriptaculous');
Starboxes.queueBuild(this);
if (Starboxes.batchLoading) Starboxes.processBuildQueue();
},
enable: function() {
if (!Prototype.Browser.IE) {
this.onMouseout = this.onMouseout.wrap(function(proceed, event) {
var rel = event.relatedTarget, cur = event.currentTarget;
if (rel && rel.nodeType == Node.TEXT_NODE) rel = rel.parentNode;
if (rel && rel != cur && !(rel.descendantOf(cur)))
proceed(event);
});
}
$w('mouseout mouseover click').each(function(e) {
var E = e.capitalize();
this['on' + E + '_cached'] = this['on' + E].bindAsEventListener(this);
this.starbar.observe(e, this['on' + E + '_cached']);
}.bind(this));
this.buttons.invoke('setStyle', { cursor: 'pointer' });
},
disable: function() {
$w('mouseover mouseout click').each(function(e) {
this.starbar.stopObserving(e, this['on' + e.capitalize() + '_cached']);
}.bind(this));
this.buttons.invoke('setStyle', { cursor: 'auto' });
},
build: function() {
this.starWidth = this.imageInfo.width;
this.starHeight = this.imageInfo.height;
this.starSrc = this.imageInfo.fullsrc;
this.boxWidth = this.starWidth * this.options.stars;
this.buttonWidth = this.boxWidth / this.options.buttons;
this.buttonRating = this.options.max / this.options.buttons;
if(this.options.effect) {
this.zeroPosition = this.getBarPosition(0);
this.maxPosition = this.getBarPosition(this.options.max);
}
var styles = {
absolute: { position: 'absolute', top: 0, left: 0, width: this.boxWidth + 'px', height: this.starHeight + 'px' },
base: { position: 'relative', width: this.boxWidth + 'px', height: this.starHeight + 'px' },
star: { position: 'absolute', top: 0, left: 0, width: this.starWidth + 'px', height: this.starHeight + 'px' }
};
this.element.addClassName('starbox');
this.container = new Element('div', { 'class': this.options.className || '' }).setStyle({ position: 'relative' });
this.status = this.container.appendChild(new Element('div'));
if (this.rated) this.status.addClassName('rated');
if (this.locked) this.status.addClassName('locked');
this.hover = this.status.appendChild(new Element('div'));
this.wrapper = this.hover.appendChild(new Element('div', { 'class': 'stars' }));
this.wrapper.setStyle(Object.extend({ overflow: 'hidden' }, styles.base));
if (this.options.ghosting) {
this.ghost = this.wrapper.appendChild(new Element('div', { 'class': 'ghost' }).setStyle(styles.absolute));
if (this.options.ghostColor) this.ghost.setStyle({ background: this.options.ghostColor });
if (this.options.effect) this.ghost.scope = this.ghost.identify();
this.setBarPosition(this.ghost, this.average, (window.Effect && Effect.Morph));
}
this.colorbar = this.wrapper.appendChild(new Element('div', { 'class': 'colorbar' }).setStyle(styles.absolute));
if (this.options.color) this.colorbar.setStyle({ background: this.options.color });
if (this.options.effect) this.colorbar.scope = this.colorbar.identify();
var starWrapper = this.wrapper.appendChild(new Element('div').setStyle(styles.absolute));
this.starbar = starWrapper.appendChild(new Element('div').setStyle(styles.base));
this.options.stars.times(function(i) {
var star = this.starbar.appendChild(new Element('div').setStyle(Object.extend({
background: 'url(' + this.starSrc + ') top left no-repeat'
}, styles.star)));
star.setStyle({ left: this.starWidth * i + 'px' });
if (Starboxes.fixIE) {
star.setStyle({
background: 'none', 'filter' : 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' +
this.starSrc + '\'\', sizingMethod=\'scale\')'
});
}
}.bind(this));
this.buttons = [];
this.options.buttons.times(function(i) {
var leftPos = this.options.inverse ? this.boxWidth - this.buttonWidth * (i + 1) : this.buttonWidth * i;
var button = this.starbar.appendChild(new Element('div', { href: 'javascript:;' }).setStyle({
position: 'absolute',
top: 0,
left: leftPos + 'px',
width: this.buttonWidth + (Prototype.Browser.IE ? 1 : 0) + 'px',
height: this.starHeight + 'px'
}));
button.rating = this.buttonRating * i + this.buttonRating;
this.buttons.push(button);
}.bind(this));
this.setBarPosition(this.colorbar, this.average);
this.element.update(this.container);
if (this.options.indicator) {
this.indicator = this.hover.appendChild(new Element('div', { 'class' : 'indicator' }));
this.updateIndicator();
}
if (!this.locked) this.enable();
},
updateAverage: function(increment) {
if (this.rated && this.options.rerate)
this.average = (this.total * this.average - this.rated) / (this.total-1 || 1);
var total = this.rated ? this.total : this.total++;
this.average = (this.average == 0) ? increment :
(this.average * (this.rated ? total-1 : total) + increment) / (this.rated ? total : total+1);
},
updateIndicator: function() {
this.indicator.update(new Template(this.options.indicator).evaluate({
max: this.options.max,
total: this.total,
average: (this.average * 10).round() / 10
}));
},
getBarPosition : function(rating) {
var position = (this.boxWidth - (rating/this.buttonRating) * this.buttonWidth);
return parseInt(this.options.inverse ? position.ceil() : -1 * position.floor());
},
setBarPosition: function(element, rating) {
if (this.options.effect && this['activeEffect_' + element.scope])
Effect.Queues.get(element.scope).remove(this['activeEffect_' + element.scope]);
var left = this.getBarPosition(rating);
if (arguments[2]) {
var current = parseInt(element.getStyle('left'));
var to = this.getBarPosition(rating);
if (current == to) return;
var mspeed = ((this.maxPosition - (current - to).abs()).abs() / this.zeroPosition.abs()).toFixed(2);
this['activeEffect_' + element.scope] = new Effect.Morph(element, { style: { left: left + 'px' },
queue: { position: 'end', limit: 1, scope: element.scope}, duration: (this.options.duration * mspeed) });
}
else { element.setStyle({ left: left + 'px' }); }
},
onClick: function(event) {
var element = event.element();
if (!element.rating) return;
this.updateAverage(element.rating);
if (this.options.indicator) this.updateIndicator();
if (this.options.ghosting) this.setBarPosition(this.ghost, this.average, (window.Effect && Effect.Morph));
if (!this.rated) this.status.addClassName('rated');
var rerated = !!this.rated;
this.rated = element.rating;
if (!this.options.rerate) {
this.disable();
this.status.addClassName('locked');
this.onMouseout(event);
}
var info = {
average: this.average,
identity: this.options.identity,
max: this.options.max,
rated: element.rating,
rerated: rerated,
total: this.total
};
this.options.onRate(this.element, info);
this.element.fire('starbox:rated');
},
onMouseout: function(event) {
this.setBarPosition(this.colorbar, this.average, (this.options.effect && this.options.effect.mouseout));
this.hovered = false;
if (this.options.hoverClass) this.hover.removeClassName(this.options.hoverClass);
if (this.options.hoverColor) this.colorbar.setStyle({ background: this.options.color });
},
onMouseover: function(event) {
var element = event.element();
if (!element.rating) return;
this.setBarPosition(this.colorbar, element.rating, (this.options.effect && this.options.effect.mouseover));
if(!this.hovered && this.options.hoverClass) this.hover.addClassName(this.options.hoverClass);
this.hovered = true;
if (this.options.hoverColor) this.colorbar.setStyle({ background: this.options.hoverColor });
}
}); |
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