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added: init options for appear-left-offset and appear-top-offset #18

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added: init options for appear-left-offset and appear-top-offset #18

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16 changes: 10 additions & 6 deletions jquery.appear.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,11 @@
var check_lock = false;
var defaults = {
interval: 250,
force_process: false
}
force_process: false,
appear_left_offset: 0,
appear_top_offset: 0
};
var params = {};
var $window = $(window);

var $prior_appeared;
Expand Down Expand Up @@ -52,19 +55,20 @@
var top = offset.top;

if (top + $element.height() >= window_top &&
top - ($element.data('appear-top-offset') || 0) <= window_top + $window.height() &&
top - ($element.data('appear-top-offset') || params.appear_top_offset) <= window_top + $window.height() &&
left + $element.width() >= window_left &&
left - ($element.data('appear-left-offset') || 0) <= window_left + $window.width()) {
left - ($element.data('appear-left-offset') || params.appear_left_offset) <= window_left + $window.width()) {
return true;
} else {
return false;
}
}
};

$.fn.extend({
// watching for element's appearance in browser viewport
appear: function(options) {
var opts = $.extend({}, defaults, options || {});
params = opts;
var selector = this.selector || this;
if (!check_binded) {
var on_check = function() {
Expand Down Expand Up @@ -94,7 +98,7 @@
if (check_binded) {
process();
return true;
};
}
return false;
}
});
Expand Down