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Visibility Enhancement #201

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Visibility Enhancement #201

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22 changes: 19 additions & 3 deletions jquery.lazy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -252,7 +252,7 @@

// bind lazy load functions to scroll and resize event
// noinspection JSUnresolvedVariable
$(config.appendScroll).on('scroll.' + namespace + ' resize.' + namespace, events.e);
$(config.appendScroll).on('scroll.' + namespace + ' resize.' + namespace + ' change mouseenter mouseleave', events.e);
}
}

Expand Down Expand Up @@ -350,7 +350,7 @@
// is not already handled
if (!element.data(handledName) &&
// and is visible or visibility doesn't matter
(!config.visibleOnly || element.is(':visible')) && (
(!config.visibleOnly || _isRendered(element)) && (
// and image source or source set attribute is available
(attribute || element.attr(srcsetAttribute)) && (
// and is image tag where attribute is not equal source or source set
Expand Down Expand Up @@ -661,6 +661,21 @@
return false;
}

function _isRendered(domObj) {
if ((domObj.nodeType != 1) || (domObj == document.body)) {
return true;
}
if (domObj.currentStyle && domObj.currentStyle["display"] != "none" && domObj.currentStyle["visibility"] != "hidden") {
return _isRendered(domObj.parentNode);
} else if (window.getComputedStyle) {
var cs = document.defaultView.getComputedStyle(domObj, null);
if (cs.getPropertyValue("display") != "none" && cs.getPropertyValue("visibility") != "hidden") {
return _isRendered(domObj.parentNode);
}
}
return false;
}

// if event driven or window is already loaded don't wait for page loading
if (config.bind === 'event' || windowLoaded) {
_initialize();
Expand All @@ -673,6 +688,7 @@
}
}


/**
* lazy plugin class constructor
* @constructor
Expand Down Expand Up @@ -869,4 +885,4 @@
$(window).on('load', function() {
windowLoaded = true;
});
})(window);
})(window);