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I am looking for a Solution to load my App Content dynamically from the Server.
My Scenario:
Lets say we have 2 Users (A and B), my App consists of different Modules like lets say a shoppingList and a calculator, now my goal would be the User logs into my App from the Database I get the User rights and depending what rights he has, i would load the html for the views and the controller files for the logic part from the Server, while doing that I would create the states needed for the html and ctrl. So basically my App is very small consistent of the Login and everything else is getting pulled from the Server depending on the Userrights.
What I use:
Why I need it to be all dynamic:
1)The possiblity to have an App that contains just the login logic, so when fixing bugs or adding Modules I only have to add the files to the server give the User the right for it and it is there without needing to update the app.
2)The User only has the functionality he needs, he doesnt need to have everything when he only has the right for 1 module.
3)The App grows very big at the moment, meaning every Module has like 5-10 states, with their own html and Controllers. currently there are 50 different Modules planned so you can do the math.
I looked at this to get some inspiration:
AngularJS, ocLazyLoad & loading dynamic States
What I tried so far:
I created 1 Html file which contains the whole module so I only have 1 http request:
Lets say this is my response from the server after the User logged in
HTML Part:
var rights= [A,B,C,D]
angular.forEach(rights, function (value, key) {
$http.get('http://myServer.com/templates/' + value + '.html').then(function (response) {
//HTML file for the whole module
splits = response.data.split('#');
//Array off HTMl strings
for (var l = 1; l <= splits.length; l++) {
//Putting all Html strings into templateCache
$templateCache.put('templates/' + value +'.html', splits[l - 1]);
}
}
});
Controller Part:
var rights= [A,B,C,D]
angular.forEach(rights, function (value, key) {
$http.get('http://myServer.com/controller/' + value + '.js').then(function (response) {
// 1 file for the whole module with all controllers
splits = response.data.split('#');
//Array off controller strings
for (var l = 1; l <= splits.length; l++) {
//Putting all Controller strings into templateCache
$templateCache.put('controllers/' + value +'.js', splits[l - 1]);
}
}
});
After loading the Controllers I try to register them:
$controllerProvider.register('SomeName', $templateCache.get('controllers/someController));
Which is not working since this is only a string...
Defining the Providers:
.config(function ($stateProvider, $urlRouterProvider, $ionicConfigProvider, $controllerProvider) {
// turns of the page transition globally
$ionicConfigProvider.views.transition('none');
$stateProviderRef = $stateProvider;
$urlRouterProviderRef = $urlRouterProvider;
$controllerProviderRef = $controllerProvider;
$stateProvider
//the login state is static for every user
.state('login', {
url: "/login",
templateUrl: "templates/login.html",
controller: "LoginCtrl"
});
//all the other states are missing and should be created depending on rights
$urlRouterProvider.otherwise('/login');
});
Ui-Router Part:
//Lets assume here the Rights Array contains more information like name, url...
angular.forEach(rights, function (value, key) {
//Checks if the state was already added
var getExistingState = $state.get(value.name)
if (getExistingState !== null) {
return;
}
var state = {
'lang': value.lang,
'params': value.param,
'url': value.url,
'templateProvider': function ($timeout, $templateCache, Ls) {
return $timeout(function () {
return $templateCache.get("templates" + value.url + ".html")
}, 100);
},
'ControllerProvider': function ($timeout, $templateCache, Ls) {
return $timeout(function () {
return $templateCache.get("controllers" + value.url + ".js")
}, 100);
}
$stateProviderRef.state(value.name, state);
});
$urlRouter.sync();
$urlRouter.listen();
Situation so far:
I have managed to load the html files and store them in the templateCache, even load them but only if the states were predefined.What I noticed here was that sometimes lets say when I remove an item from a List and come back to the View the item was there again maybe this has something to do with cache I am not really sure...
I have managed to load the controller files and save the controllers in the templateCache but I dont really know how to use the $ControllerPrioviderRef.register with my stored strings...
Creating the states did work but the Controller didnt fit so i could not open any views...
PS: I also looked at require.js and OCLazyLoad as well as this example dynamic controller example
Update:
Okay so I managed to load the Html , create the State with the Controller everything seems to work fine, except that the Controller does not seem to work at all, there are no errors, but it seems nothing of the Controller logic is executed. Currently the only solution to register the controller from the previous downloaded file was to use eval(), which is more a hack then a proper solution.
Here the code:
.factory('ModularService', ['$http', ....., function ( $http, ...., ) {
return {
LoadModularContent: function () {
//var $state = $rootScope.$state;
var json = [
{
module: 'Calc',
name: 'ca10',
lang: [],
params: 9,
url: '/ca10',
templateUrl: "templates/ca/ca10.html",
controller: ["Ca10"]
},
{
module: 'SL',
name: 'sl10',
lang: [],
params: 9,
url: '/sl10',
templateUrl: "templates/sl/sl10.html",
controller: ['Sl10', 'Sl20', 'Sl25', 'Sl30', 'Sl40', 'Sl50', 'Sl60', 'Sl70']
}
];
//Load the html
angular.forEach(json, function (value, key) {
$http.get('http://myserver.com/' + value.module + '.html')
.then(function (response) {
var splits = response.data.split('#');
for (var l = 1; l <= value.controller.length; l++) {
$templateCache.put('templates/' + value.controller[l - 1] + '.html', splits[l - 1]);
if (l == value.controller.length) {
$http.get('http://myserver.com//'+value.module+'.js')
.then(function (response2) {
var ctrls = response2.data.split('##');
var fullctrl;
for (var m = 1; m <= value.controller.length; m++){
var ctrlName = value.controller[m - 1] + 'Ctrl';
$controllerProviderRef
.register(ctrlName, ['$scope',...., function ($scope, ...,) {
eval(ctrls[m - 1]);
}])
if (m == value.controller.length) {
for (var o = 1; o <= value.controller.length; o++) {
var html = $templateCache
.get("templates/" + value.controller[o - 1] + ".html");
var getExistingState = $state.get(value.controller[o - 1].toLowerCase());
if (getExistingState !== null) {
return;
}
var state = {
'lang': value.lang,
'params': value.param,
'url': '/' + value.controller[o - 1].toLowerCase(),
'template': html,
'controller': value.controller[o - 1] + 'Ctrl'
};
$stateProviderRef.state(value.controller[o - 1].toLowerCase(), state);
}
}
}
});
}
}
});
});
// Configures $urlRouter's listener *after* your custom listener
$urlRouter.sync();
$urlRouter.listen();
}
}
}])
Any help appreciated
592
Ok, so let's start from the beginning.
All the application logic should be contained on the server and served via API-calls through REST, SOAP or similar. By doing so, you reduce the amount of logic built into the UI, which reduces the stress on the client. This basically makes your client app a rendering agent, containing only models and views for the data and logic served by the backend API.
As foreyez stated in his/her comment, this isn't an issue for any modern (or half-modern) device.
If you insist on not loading all of the layouts at once, you could of course separate them into partials, which you load after the login based on the user privileges. By doing so, you reduce the amount of in-memory data, even though the improvement would be doubtable, at best.
144
Can I suggest you to do some changes to the way you load the states?
Write a script that give you back a json with the states the user can access.
Ex.
resources/routing-config.yourLangage?user=user-id-12345
this will return a json file that depends on the user logged in. The structure can be something like this:
[
{
"name": "home",
"url": "/home",
"templateUrl": "views/home.html",
"controller": "HomeController",
"dependencies": ["scripts/home/controllers.js", "scripts/home/services.js", "scripts/home/directives.js"]
},
{
"name": "user",
"url": "/user",
"templateUrl": "views/user.html",
"controller": "UserController",
"dependencies": ["scripts/user/controllers.js", "scripts/user/services.js", "scripts/home/directives.js"]
}
]
Then let's write a service that will read the states the user is allowed to access:
app.factory('routingConfig', ['$resource',
function ($resource) {
return $resource('resources/routing-config.yourLangage', {}, {
query: {method: 'GET',
params: {},
isArray: true,
transformResponse: function (data) {
// before that we give the states data to the app, let's load all the dependencies
var states = [];
angular.forEach(angular.fromJson(data), function(value, key) {
value.resolve = {
deps: ['$q', '$rootScope', function($q, $rootScope){
// this will be resolved only when the user will go to the relative state defined in the var value
var deferred = $q.defer();
/*
now we need to load the dependencies. I use the script.js javascript loader to load the dependencies for each page.
It is very small and easy to be used
http://www.dustindiaz.com/scriptjs
*/
$script(value.dependencies, function(){ //here we will load what is defined in the dependencies field. ex: "dependencies": ["scripts/user/controllers.js", "scripts/user/services.js", "scripts/home/directives.js"]
// all dependencies have now been loaded by so resolve the promise
$rootScope.$apply(function(){
deferred.resolve();
});
});
return deferred.promise;
}]
};
states.push(value);
});
return states;
}
}
});
}]);
Then let's configure the app:
app.config(['$stateProvider', '$urlRouterProvider', '$locationProvider', '$filterProvider', '$provide', '$compileProvider',
function ($stateProvider, $urlRouterProvider, $locationProvider, $filterProvider, $provide, $compileProvider) {
// this will be the default state where to go as far as the states aren't loaded
var loading = {
name: 'loading',
url: '/loading',
templateUrl: '/views/loading.html',
controller: 'LoadingController'
};
// if the user ask for a page that he cannot access
var _404 = {
name: '_404',
url: '/404',
templateUrl: 'views/404.html',
controller: '404Controller'
};
$stateProvider
.state(loading)
.state(_404);
// save a reference to all of the providers to register everything lazily
$stateProviderRef = $stateProvider;
$urlRouterProviderRef = $urlRouterProvider;
$controllerProviderRef = $controllerProvider;
$filterProviderRef = $filterProvider;
$provideRef = $provide;
$compileProviderRef = $compileProvider;
//redirect the not found urls
$urlRouterProvider.otherwise('/404');
}]);
Now let's use this service in the app.run:
app.run(function ($location, $rootScope, $state, $q, routingConfig) {
// We need to attach a promise to the rootScope. This will tell us when all of the states are loaded.
var myDeferredObj = $q.defer();
$rootScope.promiseRoutingConfigEnd = myDeferredObj.promise;
// Query the config file
var remoteStates = routingConfig.query(function() {
angular.forEach(remoteStates, function(value, key) {
// the state becomes the value
$stateProviderRef.state(value);
});
// resolve the promise.
myDeferredObj.resolve();
});
//redirect to the loading page until all of the states are completely loaded and store the original path requested
$rootScope.myPath = $location.path();
$location.path('/loading'); //and then (in the loading controller) we will redirect to the right state
//check for routing errors
$rootScope.$on('$stateChangeError',
function(event, toState, toParams, fromState, fromParams, error){
console.log.bind(console);
});
$rootScope.$on('$stateNotFound',
function(event, unfoundState, fromState, fromParams){
console.error(unfoundState.to); // "lazy.state"
console.error(unfoundState.toParams); // {a:1, b:2}
console.error(unfoundState.options); // {inherit:false} + default options
});
});
Eventually, the LoadingController:
app.controller('LoadingController', ['$scope', '$location', '$rootScope',
function($scope, $location, $rootScope) {
//when all of the states are loaded, redirect to the requested state
$rootScope.promiseRoutingConfigEnd.then(function(){
//if the user requested the page /loading then redirect him to the home page
if($rootScope.myPath === '/loading'){
$rootScope.myPath = '/home';
}
$location.path($rootScope.myPath);
});
}]);
In this way everything is super flexible and lazy loaded.
I wrote 3 different user portals already and I can easily scale to all of the user portal I want.
44
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