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ngStorage.js
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ngStorage.js
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(function (root, factory) {
'use strict';
if (typeof define === 'function' && define.amd) {
define(['angular'], factory);
} else if (typeof exports === 'object') {
factory(require('angular'));
module.exports = 'ngStorage';
} else {
// Browser globals (root is window), we don't register it.
factory(root.angular);
}
}(this , function (angular) {
'use strict';
// In cases where Angular does not get passed or angular is a truthy value
// but misses .module we can fall back to using window.
angular = (angular && angular.module ) ? angular : window.angular;
function isStorageSupported($window, storageType) {
// Some installations of IE, for an unknown reason, throw "SCRIPT5: Error: Access is denied"
// when accessing window.localStorage. This happens before you try to do anything with it. Catch
// that error and allow execution to continue.
// fix 'SecurityError: DOM Exception 18' exception in Desktop Safari, Mobile Safari
// when "Block cookies": "Always block" is turned on
var supported;
try {
supported = $window[storageType];
}
catch(err) {
supported = false;
}
// When Safari (OS X or iOS) is in private browsing mode, it appears as though localStorage and sessionStorage
// is available, but trying to call .setItem throws an exception below:
// "QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to add something to storage that exceeded the quota."
if(supported) {
var key = '__' + Math.round(Math.random() * 1e7);
try {
$window[storageType].setItem(key, key);
$window[storageType].removeItem(key, key);
}
catch(err) {
supported = false;
}
}
return supported;
}
/**
* @ngdoc overview
* @name ngStorage
*/
return angular.module('ngStorage', [])
/**
* @ngdoc object
* @name ngStorage.$localStorage
* @requires $rootScope
* @requires $window
*/
.provider('$localStorage', _storageProvider('localStorage'))
/**
* @ngdoc object
* @name ngStorage.$sessionStorage
* @requires $rootScope
* @requires $window
*/
.provider('$sessionStorage', _storageProvider('sessionStorage'));
function _storageProvider(storageType) {
var providerWebStorage = isStorageSupported(window, storageType);
return function () {
var storageKeyPrefix = 'ngStorage-';
this.setKeyPrefix = function (prefix) {
if (typeof prefix !== 'string') {
throw new TypeError('[ngStorage] - ' + storageType + 'Provider.setKeyPrefix() expects a String.');
}
storageKeyPrefix = prefix;
};
var serializer = angular.toJson;
var deserializer = angular.fromJson;
this.setSerializer = function (s) {
if (typeof s !== 'function') {
throw new TypeError('[ngStorage] - ' + storageType + 'Provider.setSerializer expects a function.');
}
serializer = s;
};
this.setDeserializer = function (d) {
if (typeof d !== 'function') {
throw new TypeError('[ngStorage] - ' + storageType + 'Provider.setDeserializer expects a function.');
}
deserializer = d;
};
this.supported = function() {
return !!providerWebStorage;
};
// Note: This is not very elegant at all.
this.get = function (key) {
return providerWebStorage && deserializer(providerWebStorage.getItem(storageKeyPrefix + key));
};
// Note: This is not very elegant at all.
this.set = function (key, value) {
return providerWebStorage && providerWebStorage.setItem(storageKeyPrefix + key, serializer(value));
};
this.remove = function (key) {
providerWebStorage && providerWebStorage.removeItem(storageKeyPrefix + key);
}
this.$get = [
'$rootScope',
'$window',
'$log',
'$timeout',
'$document',
function(
$rootScope,
$window,
$log,
$timeout,
$document
){
// The magic number 10 is used which only works for some keyPrefixes...
// See https://github.com/gsklee/ngStorage/issues/137
var prefixLength = storageKeyPrefix.length;
// #9: Assign a placeholder object if Web Storage is unavailable to prevent breaking the entire AngularJS app
// Note: recheck mainly for testing (so we can use $window[storageType] rather than window[storageType])
var isSupported = isStorageSupported($window, storageType),
webStorage = isSupported || ($log.warn('This browser does not support Web Storage!'), {setItem: angular.noop, getItem: angular.noop, removeItem: angular.noop}),
$storage = {
$default: function(items) {
for (var k in items) {
angular.isDefined($storage[k]) || ($storage[k] = angular.copy(items[k]) );
}
$storage.$sync();
return $storage;
},
$reset: function(items) {
for (var k in $storage) {
'$' === k[0] || (delete $storage[k] && webStorage.removeItem(storageKeyPrefix + k));
}
return $storage.$default(items);
},
$sync: function () {
for (var i = 0, l = webStorage.length, k; i < l; i++) {
// #8, #10: `webStorage.key(i)` may be an empty string (or throw an exception in IE9 if `webStorage` is empty)
(k = webStorage.key(i)) && storageKeyPrefix === k.slice(0, prefixLength) && ($storage[k.slice(prefixLength)] = deserializer(webStorage.getItem(k)));
}
},
$apply: function() {
var temp$storage;
_debounce = null;
if (!angular.equals($storage, _last$storage)) {
temp$storage = angular.copy(_last$storage);
angular.forEach($storage, function(v, k) {
if (angular.isDefined(v) && '$' !== k[0]) {
webStorage.setItem(storageKeyPrefix + k, serializer(v));
delete temp$storage[k];
}
});
for (var k in temp$storage) {
webStorage.removeItem(storageKeyPrefix + k);
}
_last$storage = angular.copy($storage);
}
},
$supported: function() {
return !!isSupported;
}
},
_last$storage,
_debounce;
$storage.$sync();
_last$storage = angular.copy($storage);
$rootScope.$watch(function() {
_debounce || (_debounce = $timeout($storage.$apply, 100, false));
});
// #6: Use `$window.addEventListener` instead of `angular.element` to avoid the jQuery-specific `event.originalEvent`
$window.addEventListener && $window.addEventListener('storage', function(event) {
if (!event.key) {
return;
}
// Reference doc.
var doc = $document[0];
if ( (!doc.hasFocus || !doc.hasFocus()) && storageKeyPrefix === event.key.slice(0, prefixLength) ) {
event.newValue ? $storage[event.key.slice(prefixLength)] = deserializer(event.newValue) : delete $storage[event.key.slice(prefixLength)];
_last$storage = angular.copy($storage);
$rootScope.$apply();
}
});
$window.addEventListener && $window.addEventListener('beforeunload', function() {
$storage.$apply();
});
return $storage;
}
];
};
}
}));