glowingbear-mainbox/js/localstorage.js
Lorenz Hübschle-Schneider fb9d5af5fc localstorage: Correctly check whether value is set before setting default
The old condition always overwrote boolean values that were set to false
with the default m( Check for undefined instead.
2014-02-21 10:50:29 +00:00

112 lines
4 KiB
JavaScript

var ls = angular.module('localStorage',[]);
ls.factory("$store",function($parse){
/**
* Global Vars
*/
var storage = (typeof window.localStorage === 'undefined') ? undefined : window.localStorage,
supported = !(typeof storage == 'undefined' || typeof window.JSON == 'undefined');
var privateMethods = {
/**
* Pass any type of a string from the localStorage to be parsed so it returns a usable version (like an Object)
* @param res - a string that will be parsed for type
* @returns {*} - whatever the real type of stored value was
*/
parseValue: function(res) {
var val;
try {
val = JSON.parse(res);
if (val === undefined){
val = res;
}
if (val === 'true'){
val = true;
}
if (val === 'false'){
val = false;
}
if (parseFloat(val) === val && !angular.isObject(val)) {
val = parseFloat(val);
}
} catch(e){
val = res;
}
return val;
}
};
var publicMethods = {
/**
* Set - let's you set a new localStorage key pair set
* @param key - a string that will be used as the accessor for the pair
* @param value - the value of the localStorage item
* @returns {*} - will return whatever it is you've stored in the local storage
*/
set: function(key,value){
if (!supported){
try {
$.cookie(key, value);
return value;
} catch(e){
console.log('Local Storage not supported, make sure you have the $.cookie supported.');
}
}
var saver = JSON.stringify(value);
storage.setItem(key, saver);
return privateMethods.parseValue(saver);
},
/**
* Get - let's you get the value of any pair you've stored
* @param key - the string that you set as accessor for the pair
* @returns {*} - Object,String,Float,Boolean depending on what you stored
*/
get: function(key){
if (!supported){
try {
return privateMethods.parseValue($.cookie(key));
} catch(e){
return null;
}
}
var item = storage.getItem(key);
return privateMethods.parseValue(item);
},
/**
* Remove - let's you nuke a value from localStorage
* @param key - the accessor value
* @returns {boolean} - if everything went as planned
*/
remove: function(key) {
if (!supported){
try {
$.cookie(key, null);
return true;
} catch(e){
return false;
}
}
storage.removeItem(key);
return true;
},
/**
* Bind - let's you directly bind a localStorage value to a $scope variable
* @param $scope - the current scope you want the variable available in
* @param key - the name of the variable you are binding
* @param def - the default value (OPTIONAL)
* @returns {*} - returns whatever the stored value is
*/
bind: function ($scope, key, def) {
def = def || '';
if (publicMethods.get(key) === undefined) {
publicMethods.set(key, def);
}
$parse(key).assign($scope, publicMethods.get(key));
$scope.$watch(key, function (val) {
publicMethods.set(key, val);
}, true);
return publicMethods.get(key);
}
};
return publicMethods;
});