Passing data between controllers in Angular JS

Question

I have a basic controller that displays my products   App controller  ProductCtrl  function  scope  productFactory         productFactory get   success function data               scope products   data                 In my view I m displaying this products in a list   lt ul gt       lt li ng-repeat  product as products  gt            product name        lt  li gt   lt  ul   What I m trying to do is when someone click on the product name  i have another view named cart where this product is added     lt ul class  cart  gt         lt li gt              click one added here        lt  li gt         lt li gt              click two added here        lt  li gt    lt  ul gt    So my doubt here is  how do pass this clicked products from first controller to second  i assumed that cart should be a controller too   I handle click event using directive  Also i feel i should be using service to achieve above functionality just can t figure how  because cart will be predefined number of products added could be 5 10 depending on which page user is  So i would like to keep this generic   Update    I created a service to broadcast and in the second controller i receive it  Now the query is how do i update dom  Since my list to drop product is pretty hardcoded

User · Answer

1  using  localStorage  app controller  ProductController   function  scope   localStorage         scope setSelectedProduct   function selectedObj            localStorage selectedObj  selectedObj              app controller  CartController   function  scope  localStorage          scope selectedProducts    localStorage selectedObj       localStorage  reset     to remove       2  On click you can call method that invokes broadcast    rootScope  broadcast  SOME TAG    your value     and the second controller will listen on this tag like   scope  on  SOME TAG   function response                       3  using  rootScope    4  window sessionStorage setItem  Mydata  data    scope data    window sessionStorage getItem  Mydata      5  One way using angular service   var app   angular module  home         app controller  one   function  scope  ser1    scope inputText   ser1       app controller  two  function  scope  ser1    scope inputTextTwo   ser1       app factory  ser1   function    return  o

User · Answer

You can do this by two methods    By using  rootscope  but I don t reccommend this  The  rootScope is the top-most scope  An app can have only one  rootScope which will be shared among all the components of an app  Hence it acts like a global variable  Using services  You can do this by sharing a service between two controllers  Code for service may look like this   app service  shareDataService   function         var myList            var addList   function newObj            myList push newObj              var getList   function            return myList             return           addList  addList          getList  getList              You can see my fiddle here

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I ve created a factory that controls shared scope between route path s pattern  so you can maintain the shared data just when users are navigating in the same route parent path    controller  CadastroController      scope    RouteSharedScope       function  scope  routeSharedScope          var customerScope   routeSharedScope scopeFor   Customer            var indexScope   routeSharedScope scopeFor                   So  if the user goes to another route path  for example   Support   the shared data for path   Customer  will be automatically destroyed  But  if instead of this the user goes to  child  paths  like   Customer 1  or   Customer list  the the scope won t be destroyed   You can see an sample here  http   plnkr co edit OL8of9

User · Answer

An even simpler way to share the data between controllers is using nested data structures  Instead of  for example   scope customer         we can use   scope data     customer          The data property will be inherited from parent scope so we can overwrite its fields  keeping the access from other controllers

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FYI The  scope Object has the   emit   broadcast   on AND The  rootScope Object has the identical  emit   broadcast   on  read more about publish subscribe design pattern in angular here

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var custApp   angular module  custApp        controller  FirstController   FirstController   controller  SecondController  SecondController   service  sharedData   SharedData    FirstController  inject     sharedData    function FirstController sharedData    this data   sharedData data     SecondController  inject  sharedData    function SecondController sharedData    this data   sharedData data     function SharedData     this data         value   default Value        First Controller    lt div ng-controller  FirstController as vm  gt   lt input type text ng-model  vm data value    gt   lt  div gt    Second Controller     lt div ng-controller  SecondController as vm  gt      Second Controller lt br gt        vm data value    lt  div gt

User · Answer

From the description  seems as though you should be using a service  Check out http   egghead io lessons angularjs-sharing-data-between-controllers and AngularJS Service Passing Data Between Controllers to see some examples   You could define your product service  as a factory  as such   app factory  productService   function       var productList          var addProduct   function newObj          productList push newObj           var getProducts   function          return productList          return       addProduct  addProduct      getProducts  getProducts             Dependency inject the service into both controllers    In your ProductController  define some action that adds the selected object to the array   app controller  ProductController   function  scope  productService         scope callToAddToProductList   function currObj           productService addProduct currObj                In your CartController  get the products from the service   app controller  CartController   function  scope  productService         scope products   productService getProducts

User · Answer

I think the best way is to use  localStorage   Works all the time   app controller  ProductController   function  scope   localStorage         scope setSelectedProduct   function selectedObj            localStorage selectedObj  selectedObj               Your cardController will be  app controller  CartController   function  scope  localStorage          scope selectedProducts    localStorage selectedObj       localStorage  reset     to remove       You can also add   if  localStorage selectedObj        scope selectedProducts    localStorage selectedObj   else        redirect to select product using  location url   select-product

User · Answer

One way using angular service   var app   angular module  home         app controller  one   function  scope  ser1    scope inputText   ser1        app controller  two  function  scope  ser1    scope inputTextTwo   ser1       app factory  ser1   function    return  o               lt div ng-app  home  gt    lt div ng-controller  one  gt    Type in text      lt input type  text  ng-model  inputText o   gt   lt  div gt   lt br   gt    lt div ng-controller  two  gt    Type in text     lt input type  text  ng-model  inputTextTwo o   gt   lt  div gt    lt  div gt    https   jsfiddle net 1w64222q

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I don t know if it will help anyone  but based on Charx  thanks   answer I have created simple cache service  Feel free to use  remix and share   angular service  cache   function         var  cache   store   get   set   clear       cache             store   function data            angular merge  cache  data                set   function data             cache   angular extend     data                get   function key            if key    null                return  cache            else               return  cache key                          clear   function              cache                   return           get   get          set   set          store   store          clear   clear

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angular module  testAppControllers            controller  ctrlOne   function   scope             scope  broadcast  test                controller  ctrlTwo   function   scope             scope  on  test   function

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how do pass this clicked products from first controller to second    On click you can call method that invokes broadcast    rootScope  broadcast  SOME TAG    your value      and the second controller will listen on this tag like    scope  on  SOME TAG   function response                       Since we can t inject  scope into services  there is nothing like a singleton  scope    But we can inject  rootScope  So if you store value into the Service  you can run  rootScope  broadcast  SOME TAG    your value    in the Service body   See  Charx description about services   app service  productService    function  rootScope               Please check good article about  broadcast   emit

User · Answer

Solution without creating Service  using  rootScope   To share properties across app Controllers you can use Angular  rootScope  This is another option to share data  putting it so that people know about it   The preferred way to share some functionality across Controllers is Services  to read or change a global property you can use  rootscope   var app   angular module  mymodule       app controller  Ctrl1      scope    rootScope     function  scope   rootScope         rootScope showBanner   true        app controller  Ctrl2      scope    rootScope     function  scope   rootScope         rootScope showBanner   false         Using  rootScope in a template  Access properties with  root     lt div ng-controller  Ctrl1  gt       lt div class  banner  ng-show   root showBanner  gt   lt  div gt   lt  div gt

User · Answer

Make a factory in your module and add a reference of the factory in controller and use its variables in the controller and now get the value of data in another controller by adding reference where ever you want

User · Answer

There are three ways to do it  a  using a service b  Exploiting depending parent child relation between controller scopes  c  In Angular 2 0  quot As quot  keyword will be pass the data from one controller to another  For more information with example  Please check the below link  http   www tutorial-points com 2016 03 angular-js html

User · Answer

To improve the solution proposed by  Maxim using  broadcast  send data don t change   rootScope  broadcast  SOME TAG    my variable      but to listening data   scope  on  SOME TAG   function event  args        console log  My variable is   args     args is value of your variable

User · Answer

I saw the answers here  and it is answering the question of sharing data between controllers  but what should I do if I want one controller to notify the other about the fact that the data has been changed  without using broadcast   EASY  Just using the famous visitor pattern   myApp service  myService   function          var visitors            var registerVisitor   function  visitor            visitors push visitor              var notifyAll   function             for  var index   0  index  lt  visitors length    index              visitors index  visit               var myData     some    list    of    data         var setData   function  newData            myData   newData          notifyAll               var getData   function              return myData             return           registerVisitor  registerVisitor          setData  setData          getData  getData           myApp controller  firstController      scope    myService       function firstController  scope  myService             var setData   function  data                myService setData data                         myApp controller  secondController      scope    myService       function secondController  scope  myService             myService registerVisitor this            this visit   function                   scope data   myService getData                        scope data   myService getData                In this simple manner  one controller can update another controller that some data has been updated

User · Answer

we can store data in session and can use it anywhere in out program    window sessionStorage setItem  Mydata  data     Other place   scope data    window sessionStorage getItem  Mydata

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