Develop Reference

Angulrjs: A controller doesn't send a value via a factory with the "as" statement

I've been teaching myself how to use the as statement of Angularjs's controller, but struggling to make controllers communicate with others, using the as syntax.
<script type="text/javascript">
angular.module('angularApp', [])
.factory('MessageService', function(){
var message = {
addedItem: "initialMessge"
};
return {
returnMessage: message//This is supposed to be the "var message" defined above
};
})
.controller('DiaplayingProductController', function(MessageService){
var instance = this;
this.data = {
message: MessageService.returnMessage.addedItem
};
})
.controller('ProductController', function($scope, $http, MessageService) {
var instance = this;
this.data = {
message: MessageService.message,
//There are other stuff here
};
this.addItem = function(productName) {
$http({
//other tasks
}).then(function addSucces(response) {
instance.data.message.addedItem = productName;
});
};
});
<span ng-controller="DiaplayingProductController as dpc" ng-bind="dpc.data.message"></span>
<div ng-controller="ProductController as pc">
#foreach ($products as $index => $product)
<div class="product">
<button ng-click="pc.addItem({{$product->name}})>
Add it to Cart
</button>
</div>
#endforeach
</div>
I use Laravel, so {{$product->name}} and #foreach are Laravel's expression.
In a nutshell,
There are one <span> and multiple <button>s, based on the result of #foreach (Again, I use Laravel, so this is basically the same thing as php's foreach)
When one of the <button> is pressed, the content of <span> is supposed to be updated.
The event is triggered in ProductController, which is supposed to update message of DiaplayingProductController, via MessageService.
The message is not going to be sent to the span tag.
This question may be silly. However, there are not many information resources out there which deal with this as statements, so I'd like to ask some advice here. Thank you in advance!

What's this #foreach?
There's a coma in your attributes. Shouldn't be there.
The expression in your ng-click has a missing parenthesis. Also, it should be an expression, therefore the {{}} have nothing to do here.
The data object are not shared between the controllers. You should:
use directives and pass the data using attributes ('=').
set the data in the $scope, which is not as good a solution
use a service as an intermediary (each controller can set/get the value
from that service)

How to add multiple items to a list

I'm building an app where users can add items to a list and I decided, for the sake of learning, to use Angular (which I'm very new to). So far, I've been able to successfully add a single item to that list without any issues. Unfortunately, whenever I try to add more than one without a page refresh, I get an error - specifically a "Undefined is not a function."
I've spent more time than I care to think about trying to resolve this issue and I'm hoping an expert out there can give me a hand. Here's what I have so far:
Controllers:
angular.module('streakApp')
.controller('StreakController', function($scope) {
// Removed REST code since it isn't relevant
$scope.streaks = Streak.query();
// Get user info and use it for making new streaks
var userInfo = User.query(function() {
var user = userInfo[0];
var userName = user.username;
$scope.newStreak = new Streak({
'user': userName
});
});
})
.controller('FormController', function($scope) {
// Works for single items, not for multiple items
$scope.addStreak = function(activity) {
$scope.streaks.push(activity);
$scope.newStreak = {};
};
});
View:
<div class="streaks" ng-controller="FormController as formCtrl">
<form name="streakForm" novalidate >
<fieldset>
<legend>Add an activity</legend>
<input ng-model="newStreak.activity" placeholder="Activity" required />
<input ng-model="newStreak.start" placeholder="Start" type="date" required />
<input ng-model="newStreak.current_streak" placeholder="Current streak" type="number" min="0" required />
<input ng-model="newStreak.notes" placeholder="Notes" />
<button type="submit" ng-click="addStreak(newStreak)">Add</button>
</fieldset>
</form>
<h4>Current streaks: {{ streaks.length }}</h4>
<div ng-show="newStreak.activity">
<hr>
<h3>{{ newStreak.activity }}</h3>
<h4>Current streak: {{ newStreak.current_streak }}</h4>
<p>Start: {{ newStreak.start | date }}</p>
<p>Notes: {{ newStreak.notes }}</p>
<hr>
</div>
<div ng-repeat="user_streak in streaks">
<!-- Removed most of this for simplicity -->
<h3>{{ user_streak.fields }}</h3>
</div>
</div>

Could you post the html of StreakController too? Your solution works fine in this fiddle:
http://jsfiddle.net/zf9y0yyg/1/
.controller('FormController', function($scope) {
$scope.streaks = [];
// Works for single items, not for multiple items
$scope.addStreak = function(activity) {
$scope.streaks.push(activity);
$scope.newStreak = {};
};
});
The $scope inject in each controller is different, so you have to define the "streaks" in FormController.

Your problems comes from :
.controller('FormController', function($scope) {
// Works for single items, not for multiple items
$scope.addStreak = function(activity) {
$scope.streaks.push(activity);
^^^^^^
// Streaks is initialized in another controller (StreakController)
// therefore, depending of when is instantiated StreakController,
// you can have an error or not
$scope.newStreak = {};
};
});
A better design would be to implement a StreakService, and to inject that service in the controller you need it. Of course, initializing $scope.streaks in FormController will make your code work, but that's not the responsibility of FormController to initialize this data.

I assume FormController is a nested controller of StreakController, so they share the same scope.
if that works for single object, it should work for mulitiple objects, the problems is you can't just use push to push an array of object to the streaks, you can for loop the array and add them individually or use push.apply trick. I thought the reason of Undefined is not a function. is because the Stack.query() return an element instead of an array of elements so, the method push doesn't exists on the $scope.streaks.
http://jsbin.com/jezomutizo/2/edit

Use http cookie value in an Angular template

I have angular working in one of my ASP.NET MVC applications. I am using two html templates with Angular Routing. One is a list of current Favorites that comes from the database and is serialized into json from my Web API and used by angular to list those items from the database.
The second html template is a form that will be used to add new favorites. When the overall page that includes my angular code loads, it has a cookie named currentSearch which is holding the value of whatever the last search parameters executed by the user.
I would like to inject this value into my angular html template (newFavoriteView.html) for the value of a hidden input named and id'd searchString.
I have tried using jQuery, but had problems, plus I would much rather do this inside of angular and somehow pass the value along to my template or do the work inside the view(template). However, I know the latter would be bad form. Below is the code I think is important for one to see in order to understand what I am doing.
Index.cshtml (My ASP.NET VIEW)
#{
ViewBag.Title = "Render Search";
ViewBag.InitModule = "renderIndex";
}
<div class="medium-12 column">
<div data-ng-view=""></div>
</div>
#section ngScripts {
<script src="~/ng-modules/render-index.js"></script>
}
Setting the cookie in the MVC Controller
private void LastSearch()
{
string lastSearch = null;
if (Request.Url != null)
{
var currentSearch = Request.Url.LocalPath + "?" +
Request.QueryString;
if (Request.Cookies["currentSearch"] != null)
{
lastSearch = Request.Cookies["currentSearch"].Value;
ViewBag.LastSearch = lastSearch;
}
if (lastSearch != currentSearch)
{
var current = new HttpCookie("currentSearch", currentSearch){
Expires = DateTime.Now.AddDays(1) };
Response.Cookies.Set(current);
var previous = new HttpCookie("lastSearch", lastSearch) {
Expires = DateTime.Now.AddDays(1) };
Response.Cookies.Set(previous);
}
}
}
render-index.js
angular
.module("renderIndex", ["ngRoute"])
.config(config)
.controller("favoritesController", favoritesController)
.controller("newFavoriteController", newFavoriteController);
function config($routeProvider) {
$routeProvider
.when("/", {
templateUrl: "/ng-templates/favoritesView.html",
controller: "favoritesController",
controllerAs: "vm"
})
.when("/newsearch", {
templateUrl: "/ng-templates/newFavoriteView.html",
controller: "newFavoriteController",
controllerAs: "vm"
})
.otherwise({ redirectTo: "/" });
};
function favoritesController($http) {
var vm = this;
vm.searches = [];
vm.isBusy = true;
$http.get("/api/favorites")
.success(function (result) {
vm.searches = result;
})
.error(function () {
alert('error/failed');
})
.then(function () {
vm.isBusy = false;
});
};
function newFavoriteController($http, $window) {
var vm = this;
vm.newFavorite = {};
vm.save = function () {
$http.post("/api/favorites", vm.newFavorite)
.success(function (result) {
var newFavorite = result.data;
//TODO: merge with existing topics
alert("Thanks for your post");
})
.error(function () {
alert("Your broken, go fix yourself!");
})
.then(function () {
$window.location = "#/";
});
};
};
favoritesView.html
<div class="container">
<h3>New Favorite</h3>
<form name="newFavoriteForm" ng-submit="vm.save()">
<fieldset>
<div class="row">
<div class="medium-12 column">
<input name="searchString" id="searchString" type="hidden"
ng-model="vm.newFavorite.searchString"/>
<label for="title">Name</label><br />
<input name="title" type="text"
ng-model="vm.newFavorite.name"/>
<label for="title">Description</label><br />
<textarea name="body" rows="5" cols="30"
ng-model="vm.newTopic.description"></textarea>
</div>
<div class="medium-12 column">
<input type="submit" class="tiny button radius" value="Save"/> |
Cancel
</div>
</div>
</fieldset>
</form>
</div>
My current attepts have been using jQuery at the end of the page after Angular has loaded and grab the cookie and stuff it in the hidden value. But I was not able to get that to work. I also thought about setting the value as a javascript variable (in my c# page) and then using that variable in angular some how. AM I going about this the right way?
Or should it be handled in the angular controller?...
I'm new to angular and the Angular Scope and a bit of ignorance are getting in the way. If any other info is needed I can make it available, thanks if you can help or guide me in the right direction.

You can do it by reading the cookie value using JavaScript, set it as a property of the $scope object and access it on the template.
//Inside your controllers
function favoritesController($http, $scope) {
//Get the cookie value using Js
var cookie = document.cookie; //the value is returned as a semi-colon separated key-value string, so split the string and get the important value
//Say the cookie string returned is 'currentSearch=AngularJS'
//Split the string and extract the cookie value
cookie = cookie.split("="); //I am assuming there's only one cookie set
//make the cookie available on $scope, can be accessed in templates now
$scope.searchString = cookie[1];
}
EXTRA NOTE
In AngularJS, the scope is the glue between your application's controllers and your view. The controller and the view share this scope object. The scope is like the model of your application. Since both the controller and the view share the same scope object, it can be used to communicate between the two. The scope can contain the data and the functions that will run in the view. Take note that every controller has its own scope. The $scope object must be injected into the controller if you want to access it.
For example:
//inject $http and $scope so you can use them in the controller
function favoritesController($http, $scope) {
Whatever is stored on the scope can be accessed on the view and the value of a scope property can also be set from the view. The scope object is important for Angular's two-way data binding.

Sorry if I'm misunderstanding or over-simplifying, but...assuming JavaScript can read this cookie-value, you could just have your controller read it and assign it to a $scope variable?
If JavaScript can't read the value, then you could have your ASP write the value to a JavaScript inline script tag. This feels yuckier though.
Update to show controller-as example.
Assuming your HTML looked something vaguely like this:
<div ng-controller="MyController as controller">
<!-- other HTML goes here -->
<input name="searchString" id="searchString" type="hidden" ng-model="controller.data.currentSearch"/>
Then your controller may look something like this:
app.controller('MyController', function ($scope, $cookies) {
$scope.data = {
currentSearch: $cookies.currentSearch
};
// Note that the model is nested in a 'data' object to ensure that
// any ngIf (or similar) directives in your HTML pass by reference
// instead of value (so 2-way binding works).
});

How to create own angular service with XHR properly?

I am very new about AngularJS things. Need to do file upload with other datas in form, I found some scripts and angular plugins but I am using my own service calls $xhr. I was able to send file but i got error, bug(not real error-bug, i just named like that) or i can not use AngularJS properly. Here it is:
.
JS
var app = angular.module('ngnNews', []);
app.factory('posts', [function () {...}]); // I reduced the codes
app.factory('$xhr', function () {
var $xhr = { reqit: function (components) { ... //My Xml HTTP Request codes here }}
return $xhr;
});
app.controller('MainCtrl', ['$http','$scope','$xhr','posts',
function ($http, $scope, $xhr, posts) {
$scope.posts = posts.posts;
$scope.files = [];
var newPost = { title: 'post one', upvotes: 20, downvotes: 5 };
$scope.posts.push(newPost);
$scope.addPost = function () {
$xhr.reqit({
form: document.getElementById('postForm'),
callbacks: {
success: function (result) {
if (result.success) {
console.log($scope.posts); //[FIRST OUT]
$scope.posts.push(result.post);
$scope.title = '';
console.log($scope.posts); //[SECOND OUT]
}
}
},
values: { upvotes: 0, downvotes: 0 },
files: $scope.files
});
...
}
}]);
.
HTML
<form action="/Home/FileUp" id="postForm" method="post" enctype="multipart/form-data">
<div class="form-group input-group">
<span class="input-group-addon">Post Title</span>
<input name="title" class="form-control" type="text" data-ng-model="title" />
</div>
<ul>
<li ng-repeat="file in files">{{file.name}}</li>
</ul>
<button class="btn btn-primary" type="button" data-ng-click="addPost()">Add New</button>
</form>
SCREEN
Sample post displayed in list
.
PROBLEMS
When I click first time Add New button everything works well until $scope.posts.push(result.post);. In console, [SECOND OUT] is here:
First object has $$hashKey but second object which sent from server(added by $scope.posts.push(result.post); function) doesn't have. I want to know why is this happening? But it's not only weird thing, when I second time click Add New button, everything completed successfully (No new logs in console, adding new post to list shown screen image above).
MAIN PROPLEM
I pushed returned value from the server but post list(in screen) is not affected when first click.
QUESTIONS
- What is happening? or
- What am I doing wrong? Thanks for any explanation.

You are doing nothing wrong with respect to $$hashkey if that is your concern. When you use ng-repeat with array of objects angular by default attaches a unique key to the items which is with the property $$hashkey. This property is then used as a key to associated DOM elements with the corresponding item in the array by identity. Moving the same object in array would move the DOM element in the same way in the DOM. You can avoid this (addition of additional property on the object by angular) by using track by with ng-repeat by providing a unique key on the object or a mere $index. So with that instead of creating a unique key and attaching it to $$haskey property angular will use the unique identifier you have provided to associate the DOM element with the respective array item.
ng-repeat="post in posts track by $index"
or (id you have a unique id for each of the object in the array, say id then)
ng-repeat="post in posts track by post.id"
And since you say you are using my xml http request code here, i am assuming it is not within the angular context so you would need to manually perform the digest cycle by using $scope.$apply() is on of those ways.
$scope.addPost = function () {
$xhr.reqit({
form: document.getElementById('postForm'),
callbacks: {
success: function (result) {
if (result.success) {
$scope.posts.push(result.post);
$scope.title = '';
$scope.$apply();//<-- here
}
}
},
But ideally you could wrap your xhr implementation with a $q and if you pass $q promise from your api, you wont need to perform a manual $scope.$apply() everywhere. Because $q promise chaining will take care of digest cycle invocation.

Similar functionality as in Dev HTTP Client using AngularJS

Right now I am working with AngularJS on a web interface which should have similar behavior like Dev HTTP Client. I can't find a way how to add headers in the way like DHC does.
I'm trying to make it somehow like this, but it isn't working since array is initialized empty:
<div ng-repeat="header in headersCollection.headers">
<input ng-model="header.name" type="text"/> :
<input ng-model="header.value" type="text"/>
</div>
<button type="button" ng-click="addNewHeader()">Add</button>
Headers should be stored inside this object and be available for creating, editing and removing through web interface. Just like in DHC.
$rootScope.headersCollection = {
headers : []
}
Any idea / link / answer are highly appreciated and answered immidiately.
Thank you.

Just make an "empty" header object in the headers collection. See http://jsfiddle.net/e8MEx/
Of course you will want to throw in some validation to make sure they are values before adding another one and potentially add the ability to remove an item:
JavaScript:
var mod = angular.module("myApp", []);
mod.run(["$rootScope", function($rootScope) {
//start the array with one empty value for header
$rootScope.headersCollection = {
headers : [{name: "", value: ""}]
}
}]);
mod.controller("MainController", ["$scope", "$rootScope", function ($scope, $rootScope) {
$scope.headersCollection = $rootScope.headersCollection
$scope.addNewHeader = function () {
//push a new empty value onto the array.
$scope.headersCollection.headers.push({name: "", value: ""});
}
}]);
HTML:
<div ng-app="myApp" ng-controller="MainController">
<div ng-repeat="header in headersCollection.headers">
<input ng-model="header.name" type="text"/> :
<input ng-model="header.value" type="text"/>
</div>
<button type="button" ng-click="addNewHeader()">Add</button>
<p>{{headersCollection.headers}}</p>
</div>