How to show item from json Array one by one in Angular JS

问题

I am developing one prototype application in ionic framework. I am newbie for angular js, HTML, CSS , Java Script and all this stuff.

I have one json file which I am using as an input. I am able to parse this Json file and able to get json object from this. This json object contains array of items. You can refer below json content for this. Here items are application A,B.....

Updated Input Json :

{
    "data": [
        {
            "applicationname": "A",
            "permissions": [
                {
                    "text": "at"
                },
                {
                    "text": "at1"
                }
            ]
        },
        {
            "applicationname": "B",
            "permissions": [
                {
                    "text": "bt"
                },
                {
                    "text": "bt1"
                }
            ]
        }
    ]
}

When the application loads for the first time, application should load only the first item from above json array which means only application "A" (first item) data.

Once user clicks on any button (install/cancel) in Footer then it should changed its data and display application "B"'s contents. This process should continue till the end of json array.

My current code is not loading even the first item data in. Am I doing something wrong in HTML?

Updated Code :

HTML file :

<ion-header-bar class="bar-calm">
    <h1 class="title">Application Permissions</h1>
</ion-header-bar>
<ion-nav-view name="home" ng-repeat="app in applicationdata">
    <div class="bar bar-subheader bar-positive">
        <h3 class="title"> {{app.applicationname }}</h3>
    </div>
    <ion-content class="has-subheader">
        <div class="list" ng-controller="CheckboxController">
            <ion-checkbox ng-repeat="item in app.permissions" ng-model="item.checked" ng-checked="selection.indexOf(item) > -1" ng-click="toggleSelection(item)">
                {{ item.text }}
                <h3 class="item-text-wrap"> details come soon </h3>
            </ion-checkbox>
            <div class="item">
                <pre ng-bind="selection | json"></pre>
            </div>
            <div class="item">
                <pre ng-bind="selection1 | json"></pre>
            </div>
        </div>
    </ion-content>
    <ion-footer-bar align-title="left" class="bar-light" ng-controller="FooterController">
        <div class="buttons">
            <button class="button button-balanced" ng-click="infunc()"> Install </button>
        </div>
        <h1 class="title"> </h1>
        <div class="buttons" ng-click="doSomething()">
            <button class="button button-balanced"> Cancel </button>
        </div>
    </ion-footer-bar>
</ion-nav-view>

app.js file :

pmApp.controller('CheckboxController', function ($scope, $http, DataService) {


    // define the function that does the ajax call
    getmydata = function () {
        return $http.get("js/sample.json")
            .success(function (data) {
                $scope.applicationdata = data;
            });

    }

    // do the ajax call
    getmydata().success(function (data) {
        // stuff is now in our scope, I can alert it
        $scope.data = $scope.applicationdata.data;
        $scope.devList = $scope.data[0].permissions;
        console.log("data : " + JSON.stringify($scope.data));
        console.log("first application data : " + JSON.stringify($scope.devList));
    });

    $scope.selection = [];
    $scope.selection1 = [];
    // toggle selection for a given employee by name
    $scope.toggleSelection = function toggleSelection(item) {
        var idx = $scope.selection.indexOf(item);
        var jsonO = angular.copy(item);
        jsonO.timestamp = Date.now();

        DataService.addTrackedData(jsonO);
        $scope.selection1 = DataService.getTrackedData();

        // is currently selected
        if (idx > -1) {
            $scope.selection.splice(idx, 1);

        }
        // is newly selected
        else {
            DataService.addSelectedData(item);
            $scope.selection = DataService.getSelectedData();
            /* $scope.selection.push(item);*/
        }
    };

});

Problems :

1 : Why is the data of first item not getting loaded? I have done changes in HTML as per my understanding.

2 : How Can I navigate through all items. I will try @John Carpenter's answer. Before that first problem should be resolved.

Please help me, thanks in advance.

回答1:

OK, so I'm not 100% sure what you want but I'll take a stab at it. In the future, it would be helpful to post less code (probably not the entire project you are working on). It is a good idea to make a simpler example than the "real" one, where you can learn what you need to learn and then go apply it to the "real" code that you have.

Anyways, this example is a simple button that you click on to change what is displayed.

var app = angular.module('MyApplication',[]);

app.controller('MyController', ['$scope', function($scope){
    $scope.indexToShow = 0;
    $scope.items = [
        'item 1', 
        'item 2', 
        'item 3'
    ];
    
    $scope.change = function(){
        $scope.indexToShow = ($scope.indexToShow + 1) % $scope.items.length;
    };
}]);

.simple-button {
  cursor: pointer;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="MyApplication" ng-controller="MyController">
  <div ng-repeat="item in items track by $index" ng-show="$index == indexToShow">
    {{item}}
  </div>
  <div class="simple-button" ng-click="change()">click me!</div>
</div>

来源：https://stackoverflow.com/questions/31278454/how-to-show-item-from-json-array-one-by-one-in-angular-js