Created
November 21, 2013 08:41
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Image Breakpointer
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(function($,window, document, undefined){ | |
var defaults = { | |
resizing: true | |
}; | |
var BreakpointManager = function(element, options) { | |
this.el = element; | |
this.$el = $(element); | |
this.options = $.extend({}, defaults,options); | |
this.breakpoints = {}; | |
this._defaults = defaults; | |
this.init(); | |
}; | |
BreakpointManager.prototype = { | |
init: function() { | |
var micro_data = this.$el.data(), | |
src = "", | |
self = this, | |
win_width = $(window).width(), | |
win_height = $(window).height(); | |
if($.isEmptyObject(micro_data)) | |
return false; | |
$.each( micro_data, $.proxy(function(key,val) { | |
var breakpoint; | |
if(key === "srcportrait") { | |
breakpoint = key; | |
} else { | |
breakpoint = key.replace(/[A-Za-z$-]/g, ""); | |
} | |
this.breakpoints[breakpoint] = val; | |
},this)); | |
src = this.getBreakpointImage(win_width); | |
this.$el.on('load', $.proxy(function(e){ | |
this.$el.trigger("breakpointer:changeImage", e.currentTarget); | |
if(dispatcher) | |
dispatcher.trigger("breakpointer:changeImage", e.currentTarget); | |
},this)); | |
this.switchImg(src); | |
if(this.options.resizing) { | |
//needs refactoring.. every image has a callback; | |
$(window).on('resize orientationchange',$.proxy(function() { | |
this.image_source = this.getBreakpointImage($(window).width()); | |
this.switchImg(this.image_source); | |
},this)); | |
} | |
}, | |
getBreakpointImage: function(width) { | |
var breakpoint_values = _.without( _.keys(this.breakpoints), 'srcportrait' ), | |
breakpoint_current; | |
breakpoint_current = _.min(breakpoint_values, function(num) { | |
if( width-parseInt(num) > 0) | |
return width-parseInt(num); | |
else | |
return 100000000000; | |
}); | |
if($(window).width() < $(window).height() && this.breakpoints['srcportrait']) | |
return this.breakpoints['srcportrait']; | |
else | |
return this.breakpoints[breakpoint_current]; | |
}, | |
switchImg: function(src) { | |
if(this.$el.attr('src') != src ) | |
this.$el.attr('src',src); | |
}, | |
dfdChangeImg: function() { | |
var dfd = new $.Deferred(); | |
this.$el.on("breakpointer:changeImage", function(){ | |
dfd.resolve(); | |
}); | |
return dfd.promise(); | |
} | |
}; | |
$.fn['breakpointer'] = function ( options ) { | |
return this.each(function () { | |
if( !$.data(this,'breakpointer')) { | |
$.data( this, 'breakpointer', new BreakpointManager( this, options )); | |
} | |
}); | |
}; | |
})(jQuery, window, document); |
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