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Merge pull request #67 from pushpesh4u/master
Customised for zepto.js
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/* | ||
* jQuery appear plugin - customised for Zepto.js | ||
* | ||
* Copyright (c) 2012 Andrey Sidorov | ||
* licensed under MIT license. | ||
* | ||
* https://github.com/morr/jquery.appear/ | ||
* | ||
* Version: 0.3.3 | ||
*/ | ||
(function($) { | ||
var selectors = []; | ||
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var check_binded = false; | ||
var check_lock = false; | ||
var defaults = { | ||
interval: 250, | ||
force_process: false | ||
} | ||
var $window = $(window); | ||
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var $prior_appeared; | ||
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function process() { | ||
check_lock = false; | ||
for (var index = 0; index < selectors.length; index++) { | ||
var $appeared = $(selectors[index]).filter(function() { | ||
return $(this).is(':appeared'); | ||
}); | ||
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$appeared.trigger('appear', [$appeared]); | ||
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if ($prior_appeared) { | ||
var $disappeared = $prior_appeared.not($appeared); | ||
$disappeared.trigger('disappear', [$disappeared]); | ||
} | ||
$prior_appeared = $appeared; | ||
} | ||
} | ||
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// "appeared" custom filter | ||
$.extend($.expr[':'], { | ||
appeared : function() { | ||
var $element = $(this); | ||
if (!$element.is(':visible')) { | ||
return false; | ||
} | ||
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var window_left = $window.scrollLeft(); | ||
var window_top = $window.scrollTop(); | ||
var offset = $element.offset(); | ||
var left = offset.left; | ||
var top = offset.top; | ||
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if (top + $element.height() >= window_top && | ||
top - ($element.data('appear-top-offset') || 0) <= window_top + $window.height() && | ||
left + $element.width() >= window_left && | ||
left - ($element.data('appear-left-offset') || 0) <= window_left + $window.width()) { | ||
return this; | ||
} else { | ||
return false; | ||
} | ||
} | ||
}); | ||
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$.fn.appear = function(options) { | ||
var opts = $.extend({}, defaults, options || {}); | ||
var selector = this.selector || this; | ||
if (!check_binded) { | ||
var on_check = function() { | ||
if (check_lock) { | ||
return; | ||
} | ||
check_lock = true; | ||
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setTimeout(process, opts.interval); | ||
}; | ||
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$(window).scroll(on_check).resize(on_check); | ||
check_binded = true; | ||
} | ||
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if (opts.force_process) { | ||
setTimeout(process, opts.interval); | ||
} | ||
selectors.push(selector); | ||
return $(selector); | ||
} | ||
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$.force_appear = function() { | ||
if (check_binded) { | ||
process(); | ||
return true; | ||
}; | ||
return false; | ||
} | ||
})(Zepto); |