Created
December 12, 2015 13:22
-
-
Save tanhauhau/c6522285c8768a24823c to your computer and use it in GitHub Desktop.
ionic-image-lazy-load + imgCache
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Combination of | |
1. ionic-image-lazy-load (https://github.com/paveisistemas/ionic-image-lazy-load) | |
2. imgCache (https://github.com/chrisben/imgcache.js/) | |
Usage: | |
<image-lazy-cached image-lazy-src="{{image}}" image-lazy-loader="dots"></image-lazy-cached> | |
Installation: | |
1. Cordova File and Cordova File Transfer plugin | |
2. install imgCache see the link above | |
3. ImgCache.init(); -- read the doc of imgCache | |
Note: | |
'image-lazy-background-image' from ionic-image-lazy-load is not available anymore |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
angular.module('ionicLazyLoadCache', []); | |
angular.module('ionicLazyLoadCache') | |
.directive('lazyScroll', ['$rootScope', | |
function($rootScope) { | |
return { | |
restrict: 'A', | |
link: function ($scope, $element) { | |
var origEvent = $scope.$onScroll; | |
$scope.$onScroll = function () { | |
$rootScope.$broadcast('lazyScrollEvent'); | |
if(typeof origEvent === 'function'){ | |
origEvent(); | |
} | |
}; | |
} | |
}; | |
}]) | |
.directive('imageLazyCached', ['$document', '$timeout', '$ionicScrollDelegate', '$compile', | |
function ($document, $timeout, $ionicScrollDelegate, $compile) { | |
return { | |
restrict: 'E', | |
template: '<img></img>', | |
replace: true, | |
scope: { | |
lazyScrollResize: "@lazyScrollResize", | |
imageLazySrc: "@imageLazySrc" | |
}, | |
link: function ($scope, $element, $attributes) { | |
if (!$attributes.imageLazyDistanceFromBottomToLoad) { | |
$attributes.imageLazyDistanceFromBottomToLoad = 0; | |
} | |
if (!$attributes.imageLazyDistanceFromRightToLoad) { | |
$attributes.imageLazyDistanceFromRightToLoad = 0; | |
} | |
var loader; | |
if ($attributes.imageLazyLoader) { | |
loader = $compile('<div class="image-loader-container"><ion-spinner class="image-loader" icon="' + $attributes.imageLazyLoader + '"></ion-spinner></div>')($scope); | |
$element.after(loader); | |
} | |
$scope.$watch('imageLazySrc', function (oldV, newV) { | |
if(loader) | |
loader.remove(); | |
if ($attributes.imageLazyLoader) { | |
loader = $compile('<div class="image-loader-container"><ion-spinner class="image-loader" icon="' + $attributes.imageLazyLoader + '"></ion-spinner></div>')($scope); | |
$element.after(loader); | |
} | |
var deregistration = $scope.$on('lazyScrollEvent', function () { | |
// console.log('scroll'); | |
if (isInView()) { | |
loadImage(); | |
deregistration(); | |
} | |
} | |
); | |
$timeout(function () { | |
if (isInView()) { | |
loadImage(); | |
deregistration(); | |
} | |
}, 500); | |
}); | |
var deregistration = $scope.$on('lazyScrollEvent', function () { | |
// console.log('scroll'); | |
if (isInView()) { | |
loadImage(); | |
deregistration(); | |
} | |
} | |
); | |
function loadImage() { | |
//Bind "load" event | |
$element.bind("load", function (e) { | |
if ($attributes.imageLazyLoader) { | |
loader.remove(); | |
} | |
if ($scope.lazyScrollResize == "true") { | |
//Call the resize to recalculate the size of the screen | |
$ionicScrollDelegate.resize(); | |
} | |
$element.unbind("load"); | |
}); | |
//load from cache | |
loadFromCache(); | |
} | |
function loadFromCache() { | |
if (ImgCache.ready) { | |
ImgCache.cacheFile($scope.imageLazySrc, function() { | |
ImgCache.getCachedFileURL($scope.imageLazySrc, function(src, tar){ | |
$element[0].src = tar; | |
}) | |
}, function() { | |
console.error('Could not download image (ImgCache).'); | |
loader.remove(); | |
}); | |
} else { | |
$element[0].src = $scope.imageLazySrc; | |
} | |
} | |
function isInView() { | |
var clientHeight = $document[0].documentElement.clientHeight; | |
var clientWidth = $document[0].documentElement.clientWidth; | |
var imageRect = $element[0].getBoundingClientRect(); | |
return (imageRect.top >= 0 && imageRect.top <= clientHeight + parseInt($attributes.imageLazyDistanceFromBottomToLoad)) | |
&& (imageRect.left >= 0 && imageRect.left <= clientWidth + parseInt($attributes.imageLazyDistanceFromRightToLoad)); | |
} | |
// bind listener | |
// listenerRemover = scrollAndResizeListener.bindListener(isInView); | |
// unbind event listeners if element was destroyed | |
// it happens when you change view, etc | |
$element.on('$destroy', function () { | |
deregistration(); | |
}); | |
// explicitly call scroll listener (because, some images are in viewport already and we haven't scrolled yet) | |
$timeout(function () { | |
if (isInView()) { | |
loadImage(); | |
deregistration(); | |
} | |
}, 500); | |
} | |
}; | |
}]); |
This is nice. Is it MIT license like the code you linked to from pavei?
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Inspiration from : http://shvchnko.com/blog/2014/08/22/leveraging-caching-in-ionic-apps/