We Keep Coding

AngularJS, Angular-Material - HTML Not rendering despite object present on $scope

I have searched extensively for a solution to this problem and can't seem to find one. Any help here would be greatly appreciated.
The Basics:
Utilizing angular-material tabs
Upon selection of an item from a dropdown, a call is made to a firebase database and returns a response, which is put into an array on the $scope.
HTML is utilizing ng-repeat on this response object.
The Problem:
Despite the response object being present on the scope, the html does not render anything until the user "clicks" another button on the view - any button at all. In fact, the user has to simply touch/click something on the screen and then the results render.
If user makes a call to the database to get artists in a certain medium (i.e. painting), but does not click anything on the screen, no results will show at all, despite response object being present in $scope.
I am stumped.
HTML:
<md-tabs md-dynamic-height md-border-bottom md-center-tabs><md-tab label="Artists">
<md-content id="tab_background" class="md-padding">
<div class="query_results hide_link" layout-padding>
<a ng-repeat="artist in results | filter: searchText"
href="/#/artist/{{artist.selectedMedium}}/{{artist.uid}}">
<md-card>
<img ng-src="{{artist.profImg}}" class="md-card-image" alt="Washed Out">
<md-card-header>
<div id="card_play_button_included">
<md-card-header-text>
<span class="hide_link md-title">{{artist.name}}{{artist.name_last}}</span>
<span class="hide_link md-subhead">{{artist.selectedSubmedium[0]}}</span>
<span class="hide_link md-caption">{{artist.neighborhood}}</span>
</md-card-header-text>
</div>
</md-card-header>
<md-card-actions layout="row" layout-align="end center">
</md-card-actions>
</md-card>
</a>
</div>
</md-content>
</md-tab>
<md-tab label="Events">
</md-tab>
</md-tabs>
Javascript:
$scope.getArtists = function(medium){
//resetting results array
$scope.firstArray = [];
$scope.results = [];
var Medium = medium.name;
firebase.database().ref('/Artists/' + Medium).once('value').then(function(snapshot){
console.log(snapshot.val());
var obj = snapshot.val();
for (var key in obj) {
var innerObj = obj[key]
innerObj.uid = key;
console.log(innerObj);
$scope.firstArray.push(innerObj);
}
$scope.results = $scope.firstArray;
$scope.runSpinner();
})
}

I used $scope.apply() and it solved it.

Hide elements in nested ng-repeat

I'm trying to make a nested list of items where user can hide either a certain item or a group of nested items. So far, I'm making use of $indexand I've got this:
<div ng-controller="ItemCtrl">
<div ng-repeat="x in xs" ng-hide="hidden == $index">
<span>{{ x.name }}</span>
<button ng-click="hide($index)">Collapse</button>
<div ng-repeat="y in x.ys" ng-hide="hidden == [x.$index, $index]">
<span>{{ y.name }}</span>
<button ng-click="hide([x.$index, $index])">Collapse</button>
<div ng-repeat="z in y.zs" ng-hide="hidden == [x.$index, y.$index, $index]">
<span>{{ z.name }}</span>
<button ng-click="hide([x.$index, y.$index, $index])">Collapse</button>
</div>
</div>
</div>
</div>
With this controller:
angular.module("app", [])
.controller("ItemCtrl", function($scope) {
$scope.xs = [...]; // My data here
$scope.hidden = -1; // Nothing hidden yet
$scope.hide = function(item) {
$scope.hidden = item;
};
});
It does work. The downside is, there will be too many $index to mantain while the nested list is going deeper. Plus, I have to write all the conditional on every nest level.
My question is, is there any alternative which is simpler, more reliable, and if possible, will generate automatically no matter how many nested item that I have?

please check ui-tree, I think it's what you looking for.
github ui-tree
and the demo
demo

Angular Material switch between show and hide programmatically

Is it possible to switch between the attributes show and hide by button click (programmatically)? I have for example a card with a map and a list view.
These are usually displayed side by side. On mobile devices, but is for the List view flex = 100 increases. The map is no longer displayed. The user should however have the possibility to switch between the two views. How I can do that?
My example tags:
<md-card flex-gt-xs="40" flex-xs="100">
<list></list>
</md-card>
<md-button>toggle Views</md-button>
<md-card flex="60" hide-xs show-gt-xs >
<leaflet height="40vh" ></leaflet>
</md-card>
Update:
Summary
I would like to have 2 columns that can be switched on mobile devices, and side by side on larger devices.

I'm not 100% sure what you are asking but this CodePen demonstrates the basics of toggling programatically.
md-button has an ng-click attribute that calls the function toggle() which toggles the view value. view is passed to the ng-if of each card.
Markup
<div ng-controller="AppCtrl" ng-cloak="" ng-app="MyApp" style="height:100%" layout="column">
<md-card flex-gt-xs="40" flex-xs="100" ng-if="view">
Card 1
<list></list>
</md-card>
<md-button ng-click="toggle()">toggle Views</md-button>
<md-card flex="60" hide-xs show-gt-xs ng-if="!view">
Card2
<leaflet height="40vh" ></leaflet>
</md-card>
</div>
JS
angular.module('MyApp',['ngMaterial', 'ngMessages', 'material.svgAssetsCache', 'ngDialog'])
.controller('AppCtrl', function($scope) {
$scope.view = true;
$scope.toggle = function () {
$scope.view = !$scope.view;
}
});
You can replace ng-if with ng-show if you need to retain information in elements that you are toggling as ng-if recreates the element each time it is true.

I have found the solution. $mdMedia does all the magic.
js:
$scope.$watch(function () {
return $mdMedia('sm');
}, function (big) {
$scope.screenIsSmall = $mdMedia('sm');
});
View:
<md-card flex="60" ng-hide="screenIsSmall&&!showMap" style="max-height: 40vh">
<md-button ng-show="screenIsSmall" ng-click="showMap = !showMap">toggle</md-button>
<leaflet height="40vh"></leaflet>
</md-card>

app.component.html
<div fxLayout="column" fxLayout.gt-sm="row wrap">
<div fxFlex="50" class="flex-p">
<mat-slide-toggle
[checked]="isSlideChecked"
(change)="toggleChanges($event)"
>Hide/Show - card</mat-slide-toggle
>
</div>
</div>
<mat-card *ngIf="isSlideChecked">Simple card</mat-card>
app.component.ts
isSlideChecked: boolean = false;
toggleChanges($event: MatSlideToggleChange) {
this.isSlideChecked = $event.checked;
}

ng-repeat inside of ng-repeat- filters not working

I am displaying the ng-repeat content in two columns.
Using this code works fine:
<div class=storerow ng-repeat="store in stores track by $index" ng-if="$index%2==0">
<div ng-repeat="i in [$index,$index+1]" ng-if="stores[i]!=null" class="ngrepeatstore">
<div class="image-container" style="background-image: url({{stores[i].image}})" ng-click="tileClicked({{stores[i].id}})">
</div>
</div>
However, when I add a filter- it breaks the NG repeat and no content appears:
<div class=storerow ng-repeat="store in stores track by $index" ng-if="$index%2==0">
<div ng-repeat="i in [$index,$index+1] | filter: greaterThan('order', 0) | orderBy:'order'" ng-if="stores[i]!=null" class="ngrepeatstore">
<div class="image-container" style="background-image: url({{stores[i].image}})" ng-click="tileClicked({{stores[i].id}})">
</div>
</div>
the .js for greaterThan
$scope.greaterThan = function(prop, val){
return function(item){
return item[prop] > val;
}}
I tried adding the filter to the first ng-repeat- however that doesn't work as it just applies the filter to the overall content (ie if just one item is greatThan 0, it shows all items- not just the ones greater than 0).

This is because you're actually telling Angular to filter the property order on [$index, $index + 1], an array of two integers, which makes no sense.
I.E. With your delegate comparing index.prop > val, what you're really doing is comparing index['order'] > someValue.
This Plunker demonstrates: http://plnkr.co/edit/FkSrmZuuK4B1ToGNgAnq?p=preview You need to move filter:greaterThan(prop, val) up to the parent ng-repeat. Only there will your filter work.
<div ng-repeat="store in stores | filter:greaterThan2('id', 0) | orderBy:'name'" ng-if="$even">
{{store.name}}
<div ng-repeat="i in [$index, $index+1] | orderBy:angular.identity:true" ng-if="stores[i] !== null">
<strong>store.id</strong> {{i}}
</div>
</div>

How to filter a list in AngularJS using several links

I have been going over a lot of tutorials on how to filter a list and can't find an example for my simple use-case.
I have several buttons such as
Name
Age
Height
I have var persons = {...} object and I display it like
<div ng-repeat="person in persons">
{{person.name...}}
</div>
How do I create a filter so each time I will click on one of the buttons the list will be filtered ?
I have tried addingng-repeat="person in persons | filter:filterPersons"
and on the script side to write:
$scope.filterPersons(person){
if (person.name == "John")
return person;
}
but this is only one use-case (how can I filter by another name?) - in other words - How do I connect the links to the filter?

You can bind your filter to scope variables as you do with any other thing. So all you need is to set the appropriated filter to the scope when the user click and bind it to the ng-repeat filter param. See:
<div ng-app>
<span ng-click="myFilter = {type: 1}">Type 1</span> |
<span ng-click="myFilter = {type: 2}">Type 2</span> |
<span ng-click="myFilter = null">No filter</span>
<ul ng-controller="Test">
<li ng-repeat="person in persons | filter:myFilter">{{person.name}}</li>
</ul>
</div>
function Test($scope) {
$scope.persons = [{type: 1, name: 'Caio'}, {type:2, name: 'Ary'}, {type:1, name: 'Camila'}];
}
Notice that the myFilter is changed when the user clicks the filter, and that it's bound to the ng-repeat filter. Fiddle here. You could also create a new filter, but this solution is far better.

My response is very similar to Caio's. I just wanted to show how to filter out an existing array.
In my ng-repeat I have a search filter that goes through the words. I wanted tabs to look for a string match. So I added a additional filter
<tr class="unEditableDrinks" ng-repeat="drink in unEditableDrinkList | orderBy:'-date'|limitTo:400|filter:search |filter:myFilter">
<td>[[drink.name]]</td>
I only have the top part of my table but this should show the strategy. The second filter called myFilter is attached to the buttons below.
<div class="btn-group" role="group">
<button type="button" class="btn btn-primary" ng-click="myFilter={name:'soda'}">Soda</button>
</div>
<div class="btn-group" role="group">
<button type="button" class="btn btn-primary" ng-click="myFilter={name:'energy'}">Energy Drinks</button>
</div>
On each button I am able to add a ng-click that goes through myFilter and searches the td with drink.name. In each ng-click I can set the value of name to search. So every title containing soda or energy can be filtered through.