Angular: Modifying the parent scope from a child component

Hey there! So I'm a beginner in this whole programming thing, but I'm currently working on a small application where I can add and update items with details using Ionic, Cordova, and AngularJS. However, I've hit a roadblock with the following scenario:

This is how my Ionic views are set up:

In index.html:

<div ng-controller="mainController">
  <ion-nav-view>

  </ion-nav-view>
</div>

In list.html:

<ion-content>
    <ion-list>
        <ion-item ng-repeat="item in items track by $index | filter:search" ui-sref="detailView({itemId: $index})">{{ item.name }}</ion-item>
    </ion-list>
</ion-content>

In add.html:

<ion-content>
    <label class="item item-input">
        <input type="text" ng-model="item.name" placeholder="Item title..."/>
    </label>
    <label class="item item-input">
        <textarea cols="30" rows="10" ng-model="item.field1" placeholder="Field1..."></textarea>
    </label>
    <label class="item item-input">
        <textarea cols="30" rows="10" ng-model="item.field2" placeholder="Field2..."></textarea>
    </label>
    <div class="row">
    <div class="col col-33"></div>
    <div class="col col-33">
        <button class="button button-block" ng-click="addItem()">Add</button>
    </div>
    <div class="col col-33"></div>
    </div>
</ion-content>

I have also created a factory that I am currently testing, and it looks something like this:

In the factory:

.factory('itemFactory', ['$cordovaFile', '$q', function ($cordovaFile, $q) {
var itemFactory = {};

// Implementation of get function...

itemFactory.add = function (itemsFromScope, newItem) {
  // Implementation of add function...
};

return itemFactory;

  }]);

Next, comes the mainController:

  .controller('mainController', function ($scope, itemFactory) {
    // Implementation of mainController...
  })

And finally, the addController:

  .controller('addController', function ($scope, $location, itemFactory) {
    // Implementation of addController...
  })

The above controllers are loaded into the views using ui-router.

Now everything seemed to be going well until I noticed a small mistake in the addController where I had $scope.field1=""; instead of $scope.newItem.field1 = "";. After correcting this, the addition process stopped working correctly. Instead of adding the correct values to my $scope.items in the mainController, I ended up with an empty item. Running this on an iOS emulator showed an empty row in the listing. Restarting the emulator displayed the new item properly. I suspect there might be a timing issue with the refresh that I can't seem to pinpoint. Any suggestions or explanations would be greatly appreciated!

Note: I have included a JSFiddle link demonstrating a similar issue for simplicity: http://jsfiddle.net/9gx3tfmy/ As shown in the JSFiddle, the data is added to the array in the factory, but the UI does not update

Update: Disregard the JSFiddle, as it seems to be working fine there, but the same problem persists with Ionic and its views. I removed the $cordovaFile parts from the code, yet the issue remains, even in the browser. I'll see if I can replicate a similar situation in the updated JSFiddle at a later time

Update: I managed to resolve the issue in the JSFiddle, but won't be able to test it in my project until later today. Functional Fiddle here: http://jsfiddle.net/9yhryL6y/8/

If I omit $scope.newItem = {} in the addController, the items are added as undefined.

Answer №1

It seems that the input fields in your add.html file are currently linked to $scope.item instead of newItem. Therefore, when attempting to add a new item, $scope.newItem remains as the default empty item.

To resolve this issue, you can try the following:

<label class="item item-input">
    <input type="text" ng-model="newItem.name" placeholder="Item title..."/>
</label>
<label class="item item-input">
    <textarea cols="30" rows="10" ng-model="newItem.field1" placeholder="Field1..."></textarea>
</label>
<label class="item item-input">
    <textarea cols="30" rows="10" ng-model="newItem.field2" placeholder="Field2..."></textarea>
</label>

Another reason your JSFiddle isn't functioning correctly is due to adding strings like "value1" to the items array which expects an object with a name property.

Additionally, be cautious about directly pushing the scope variable into the items array as it doesn't create a new object but simply pushes the model that the inputs are connected to. For example: http://jsfiddle.net/9yhryL6y/

You might find the ionic ToDo list demo beneficial for learning how to push new objects into an array for ng-repeat. https://github.com/driftyco/ionic-todo/blob/master/www/js/app.js

Answer №2

After some troubleshooting, I finally resolved my Angular issue. The problem stemmed from two misunderstandings on my part. Initially, I mistakenly returned a complete object from the factory and directly bound part of it to the scope as shown below:

.controller('myController', ['$scope', 'myFactory', function ($scope, myFactory) {
  $scope.items = myFactory.items;
})])
.factory('myFactory', function () {
  var factoryItems = {};

  factoryItems.items = ['item1', 'item2'];
});

Unfortunately, when I updated the array in my Factory, the changes were not reflected in the scope. To rectify this, I adjusted the binding like so:

$scope.myFactory = myFactory;

Subsequently, I utilized the factory in the views using the following code:

ng-repeat="item in myFactory.items track by $index"

This simple adjustment successfully solved the issue for me. For additional insights, I found this article particularly helpful:

Modified data in a factory that's bound to a controller's scope, it doesn't update

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