在页面加载之前加载数据AngularJS和NodeJS

Question

i'm a little newie in AngularJS and NodeJS, i have an app that i want to load some data from a mysql db and load that data through Node server and Angular framework, my question is, how can i load the data to show it in a page before its loaded? i'm tryng it but always i get undefined from json var.

This is my code:

var app = angular.module('pedidos',[]);
app.service('adminPedidos',function($http){
    this.getAll = function(){
        var data =[];
        var req = {
            method: 'GET',
            url: 'http://localhost:3000/all',
        };
        return $http(req).then(function(response, status, headers, config) {
            return response;
        }).error(function(response, status, headers, config) {
            alert(response+" "+status);
        });
    };
});

and the controller have the following sentence:

app.controller('Main'['$scope','$http','adminPedidos',function($scope,$http,$adminPedidos){
    this.json = [];
    this.json = $adminPedidos.json;
    console.log(this.json);
}]);

Also in html i have this:

<section class="container" ng-controller="Main as controller">
    <section ng-repeat="items in controller.json" class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
        <div data-id="{{items.id}}">
            <span class="col-lg-3 col-md-3 col-sm-6 col-xs-12" name="name">{{items.name}}</span>
            <span class="col-lg-3 col-md-3 col-sm-6 col-xs-12" name="link"><a href="{{item.link}}">{{items.link}}</a></span>
            <span class="col-lg-2 col-md-2 col-sm-6 col-xs-12" name="price">{{items.price}}</span>
            <span class="col-lg-1 col-md-1 col-sm-6 col-xs-12" name="quantity">{{items.quantity}}</span>
        </div>
        <div class="col-lg-offset-1 col-md-offset-1 col-lg-1 col-md-2 col-sm-6 col-xs-6"><button id="edit" class="btn btn-warning">Editar</button></div>
        <div class="col-lg-1 col-md-2 col-sm-6 col-xs-6"><button id="delete" class="btn btn-danger">Borrar</button></div>
    </section>
</section>

Answer 1

Sadly this is not something that you can completely achieve in a straight forward manner with angular. If you are loading a lot of data then you will have to hide you view and show only when the data has loaded. However if you are loading only a little data, the you could give the following code a try:

$scope.$on("$ionicView.beforeEnter", function(){
  //Load data here
  //And bind to scope
})

But generally for a solid fix, I always would recommend that you hide the view using ng-show or ng-hide and only show the view once all the data has loaded.

Answer 2

A good way would be to use Location Provider ($locationProvider) or State provider ($stateProvider), where you have the ability to load a view after resolving a promise.

Or else if you are not using any of these, as in your case, since the service is returning promise, have the view updated when it resolves using 'then'

    app.controller(){
    this.json = [];
    var self = this;
    adminPedidos.then(function(data){
        self.json = data; //a digest cycle would be required (Depends)
//also, probably use ng-show to show the view (as other person have suggested)
    }, function(err){

    });
    console.log(this.json);
}]);

Answer 3

Service

angular.module('pedidos').factory('adminPedidos', ['$http', function ($http) {
  return {
      getAll: function () {
        return $http.get('all'); // or change all to http://localhost:3000/all
      }
   };
}]); 

Controller

angular.module('pedidos').controller('Main'['$scope', 'adminPedidos', function ($scope, adminPedidos) {
        adminPedidos.getAll().success(function (data) {
           $scope.items = data;
        });
}]);

html

<section class="container" ng-controller="Main">
<section ng-repeat="item in items" class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
    <div data-id="{{item.id}}">
        <span class="col-lg-3 col-md-3 col-sm-6 col-xs-12" name="name">{{item.name}}</span>
        <span class="col-lg-3 col-md-3 col-sm-6 col-xs-12" name="link"><a href="{{item.link}}">{{item.link}}</a></span>
        <span class="col-lg-2 col-md-2 col-sm-6 col-xs-12" name="price">{{item.price}}</span>
        <span class="col-lg-1 col-md-1 col-sm-6 col-xs-12" name="quantity">{{item.quantity}}</span>
    </div>
    <div class="col-lg-offset-1 col-md-offset-1 col-lg-1 col-md-2 col-sm-6 col-xs-6"><button id="edit" class="btn btn-warning">Editar</button></div>
    <div class="col-lg-1 col-md-2 col-sm-6 col-xs-6"><button id="delete" class="btn btn-danger">Borrar</button></div>
</section>