Develop Reference

Unable to set the value of bound property in angular component

I'm trying to implement a bound property for an angular component as explained in the component documentation and this example.
Unfortunately the values I'm assigning at the tag level or in the $onInit methods are never used. Nor is the value printed when I use it as a model value.
You can find the full code on plunker.
My binding definition:
(function(angular) {
'use strict';
function SearchResultController($scope, $element, $attrs) {
var ctrl = this;
ctrl.searchFor = 'nohting-ctor';
ctrl.$onInit = function() {
console.log('SearchResultController.$onInit: searchFor='+ctrl.searchFor);
ctrl.searchFor = 'nothing-int';
};
}
angular.module('myApp').component('searchResult', {
templateUrl: 'searchResult.html',
controller: SearchResultController,
bindings: {
searchFor: '<'
}
});
})(window.angular);
Template:
<p>SearchResult for <span ng-model="$ctrl.searchFor"</span></span></p>
How it's used:
<h1>Main Window</h1>
<search-input on-start-search="$ctrl.startSearch(value)"></search-input>
<search-result search-for="nothing-ext"></search-result>
None of the nothing-* values is evers shown.
Any ideas what's wrong?

The usage of you component is not correct. If you want to pass a string it should be quoted:
<search-result search-for="'nothing-ext'"></search-result>
Then next problem is that this line
<p>SearchResult for <span ng-model="$ctrl.searchFor"</span></span></p>
doesn't make sense, as ngModel directive is only valid for input controls. You want ngBind or simple {{ $ctrl.searchFor }}:
<p>SearchResult for <span ng-bind="$ctrl.searchFor"</span></span></p>

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)

Displaying a selected file from an <input> in AngularJS

I have a working example using standard Javascript, but I'd like to make this work more natively with AngularJS.
Specifically, I need to update the span with the filename of the file selected by the user.
Here's what I implemented using native Javascript:
<span>
<input ng-model="uploadDownloads" type="file" style="visibility:hidden; width: 1px;" id=uploadDownloads name=uploadDownloads onchange="$(this).parent().find('span').html($(this).val().replace('C:\\fakepath\\', ''))" /> <!-- Chrome security returns 'C:\fakepath\' -->
<input class="btn btn-primary" type="button" value="choose file" onclick="$(this).parent().find('input[type=file]').click();"/> <!-- on button click fire the file click event -->
<span class="badge badge-important" ></span>
</span>
The filereader function is in angular already :
$scope.add = function(valid){
if(valid){
$scope.data = 'none';
var f = document.getElementById('uploadDownloads').files[0];
var r = new FileReader();
r.onloadend = function(e){
$scope.data = e.target.result;
$scope.notPass = false;
$modalInstance.close({
'data':$scope.data,
'fileName':$scope.fileName,
'fileExplain':$scope.fileExplain
});
};
/*activate the onloadend to catch the file*/
r.readAsBinaryString(f);
} else {
$scope.notPass = true;
}
};
The problem is to activate the onclick and the onchange with Angular instead the JavaScript so that my <span> gets updated with the selected filename.

This question builds upon an existing question and answer. Specifically, however, I have modified the code from that answer to accomodate what appears to be the specific question here, which is how do you update a <span> to have the filename selected by a user in a way that's idiomatic to angularjs.
Here's a codepen with a working sample.
Here's the relevant part of the html file:
<body ng-controller="AppController">
<input ng-model="uploadDownloads" type="file" fd-input file-name="fileName"/>
<span class="badge badge-important">Output here: {{fileName}}</span>
</body>
What's key here is that you have a custom directive called fd-input that has a two-way binding to an attribute it defines called file-name. You can pass one of your $scope variables into that attribute and the directive will bind the filename to it. Here's the controller and the directive.
(function() {
'use strict';
angular.module('app', [])
.controller('AppController', AppController)
.directive('fdInput', fdInput);
function AppController($scope) {
$scope.fileName = '';
}
function fdInput() {
return {
scope: {
fileName: '='
},
link: function(scope, element, attrs) {
element.on('change', function(evt) {
var files = evt.target.files;
console.log(files[0].name);
console.log(files[0].size);
scope.fileName = files[0].name;
scope.$apply();
});
}
}
};
})();
As mentioned above, the directive is taken directly from another SO answer. I have modified it to add a scope that does a two way binding to a file-name attribute:
...
return {
scope: {
fileName: '='
},
...
I then assign files[0].name to the two-way binding:
...
scope.fileName = files[0].name;
scope.$apply();
...
Checkout the codepen. That should do it. You could just use the parent scope in the directive, but that's not a good idea as it limits you to using this directive once per controller. Also, if you want to list multiple files, you'll have to update this code to return an array of those files instead.
Hope this help.

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).
});

Angularjs custom form control scope is duplicated

I have created a simple angularjs directive to input city and zip codes. It works fine except that if I used it twice within the same controller the values in the input field are duplicated!
I believe it's a scope problem but I don't know how to solve it?
FDVilleModule = angular.module('FDVille', []).
directive('fdVille', () ->
return {
restrict: 'E'
require: 'ngModel'
template: """
<div class=\"row-fluid\">
<div class=\"span4\">
<input
ng-model=\"cp\"
ng-change=\"edit()\"
maxlength=\"5\"
type=\"text\"
class=\"input-block-level\"
placeholder=\"Code Postal\" />
</div>
<div class=\"span8\">
<select ng-model=\"selected_ville\"
ng-options=\"v.id as v.nom for v in villes\"
class=\"input-block-level\">
</select>
</div>
</div>"""
link: (scope, elem, attr, ctrl) ->
scope.$watch('selected_ville', (value)->
ctrl.$setViewValue(value))
controller: ($scope) ->
download_villes = (cp) -> $.getJSON('/ws/villes/cp', {cp:cp}, set_data)
download_villesid = (id) -> $.getJSON('/ws/villes/id', {id:id}, set_init_data)
set_data = (results) ->
$scope.villes = results
$scope.selected_ville = results[0].id if results.length
$scope.$apply()
saved_cp = ""
$scope.edit = () ->
if isNaN($scope.cp)
$scope.cp = saved_cp
else
saved_cp = $scope.cp
if saved_cp.length == 5
download_villes(saved_cp)
else
$scope.selected_ville = null
$scope.villes = []
}
)

Actually I found the answer in the docs:
scope - If set to:
true - then a new scope will be created for this directive. If
multiple directives on the same element request a new scope, only one
new scope is created. The new scope rule does not apply for the root
of the template since the root of the template always gets a new
scope.

In some other instance, you could try
replace: true
Note: you need to have one root element.
Here's the link to the documentation for us readers who didn't know:
http://docs.angularjs.org/guide/directive