AngularJS学习笔记（3）——通过Ajax获取JSON数据

时间：2021-09-23 20:18:16

通过Ajax获取JSON数据

以我之前写的与用户交互的动态清单列表为例，使用JSON前todo.html代码如下：

<!DOCTYPE html>

<html ng-app="todoApp">

<head>

    <meta charset="UTF-8">

    <title>TO DO List</title>

    <link href="./bootstrap/css/bootstrap.css" rel="stylesheet"/>

    <link href="./bootstrap/css/bootstrap-theme.css" rel="stylesheet"/>

    <script src="./angularJs/angular.js"></script>

    <script>

        var model = {

            user:"Yimi",

            items:[{action:"练车",done:true},

                {action:"看课外书",done:false}]

        };

        var todoApp = angular.module("todoApp",[]);

        todoApp.controller("ToDoCtrl",function($scope){ //以$开头的变量名表示AngularJS的内置特性

            $scope.todo = model;

            $scope.incompleteCount = function(){

                var count = 0;

                angular.forEach($scope.todo.items,function(item){

                    if(!item.done){count++;}

                });

                return count;

            }

            $scope.warningLevel = function(){

                return $scope.incompleteCount() < 2 ? "label-success" : "label-warning";

            }

            $scope.addNewItem = function(actionText){

                $scope.todo.items.push({action:actionText, done:false});

            }

        });

    </script>

</head>

<body ng-controller="ToDoCtrl">

<div class="page-header">

    <h1>{{todo.user}}'s TO DO List

    <!--添加ng-hide="incompleteCount() == 0"使未办事项数为0时不显示此标签-->

    <span class="label label-default" ng-hide="incompleteCount() == 0" ng-class="warningLevel()">{{incompleteCount()}}</span></h1>

</div>

<div class="panel">

    <div class="input-group">

        <input class="form-control" ng-model="actionText"/>

        <span class="input-group-btn">

                <button class="btn btn-default" ng-click="addNewItem(actionText)">Add</button>

        </span>

    </div>

    <table class="table table-striped">

        <thead>

        <tr>

            <th>Description</th>

            <th>Done</th>

        </tr>

        </thead>

        <tbody>

        <tr ng-repeat="item in todo.items">

            <td>{{item.action}}</td>

            <td><input type="checkbox" ng-model="item.done"/></td>

            <td>{{item.done}}</td>

        </tr>

        </tbody>

    </table>

</div>

</body>

</html>

效果图如下： 
AngularJS学习笔记（3）——通过Ajax获取JSON数据

现在把模型model内的items中的值单独写成一个JSON文件，再通过发起Ajax请求的方式获取JSON数据。

1.把todo.html文件内的模型model去除直接定义的items，改成如下形式：

 var model = {

            user: "admin"

        };

2.新建todo.json文件并编写如下代码：

[

  {"action": "练车","done": false},

  {"action": "看书","done": true}

]

3.发起Ajax请求的方式获取JSON数据：

......

todoApp.run(function ($http) {

            $http.get("./todo.json").success(function (data) {

                model.items = data;

                console.log("data:" ,data );

                console.log("items:" , model.items)

            });

        });

......

现在，清单列表中的数据项就都是通过JSON数据来传递的了，使用Chrome可以浏览器查看时可以按F12看到NetWork的状态，状态码为200即成功获取。可以看到todo.json的数据成功获取到了： 
AngularJS学习笔记（3）——通过Ajax获取JSON数据
而且显示的页面效果与原先一致。

完整源码（css/js文件需自己额外设置）： 
todo.html

<!DOCTYPE html>

<html ng-app="todoApp">

<head>

    <meta charset="UTF-8">

    <title>TO DO List</title>

    <link href="./bootstrap/css/bootstrap.css" rel="stylesheet"/>

    <link href="./bootstrap/css/bootstrap-theme.css" rel="stylesheet"/>

    <script src="./angularJs/angular.js"></script>

    <script>

        var model = {

            user: "Yimi"

        };

        var todoApp = angular.module("todoApp", []);

        todoApp.run(function ($http) {

            $http.get("./todo.json").success(function (data) {

                model.items = data;

                console.log("data:" ,data );

                console.log("items:" , model.items)

            });

        });

        todoApp.controller("ToDoCtrl", function ($scope) {

            $scope.todo = model;

            $scope.incompleteCount = function () {

                var count = 0;

                angular.forEach($scope.todo.items, function (item) {

                    if (!item.done) {

                        count++;

                    }

                });

                return count;

            }

            $scope.warningLevel = function () {

                return $scope.incompleteCount() < 2 ? "label-success" : "label-warning";

            }

            $scope.addNewItem = function (actionText) {

                $scope.todo.items.push({action: actionText, done: false});

            }

        });

    </script>

</head>

<body ng-controller="ToDoCtrl">

<div class="page-header">

    <h1>{{todo.user}}'s TO DO List

        <!--添加ng-hide="incompleteCount() == 0"使未办事项数为0时不显示此标签-->

        <span class="label label-default" ng-hide="incompleteCount() == 0" ng-class="warningLevel()">{{incompleteCount()}}</span>

    </h1>

</div>

<div class="panel">

    <div class="input-group">

        <input class="form-control" ng-model="actionText"/>

        <span class="input-group-btn">

                <button class="btn btn-default" ng-click="addNewItem(actionText)">Add</button>

        </span>

    </div>

    <table class="table table-striped">

        <thead>

        <tr>

            <th>Description</th>

            <th>Done</th>

            <th></th>

        </tr>

        </thead>

        <tbody>

        <tr ng-repeat="item in todo.items">

            <td>{{item.action}}</td>

            <td><input type="checkbox" ng-model="item.done"/></td>

            <td>{{item.done}}</td>

        </tr>

        </tbody>

    </table>

</div>

</body>

</html>

todo.json

[

  {"action": "练车","done": false},

  {"action": "看书","done": true}

]

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