个人中心
gpt4 book ai didi

javascript - 获取 http.get 数据到本地 JSON 数组变量

转载 作者：数据小太阳 更新时间：2023-10-29 04:18:05 25 4
gpt4 key购买 nike

我是 Angular 和 Nodejs 的新手，我认为这会是一个值得尝试的有趣项目。我正在尝试从 angular.js 中的 http.get 获取 json 数据并将其放入变量城市中，以便它可以显示在谷歌地图上。

当我尝试 console.log(cities); 它返回一个对象但 console.log(cities.items) 返回并且未定义；

当我尝试查看是否可以 JSON.stringify $http.get 中的数据时，它会显示下面的数据，这正是我想要完成的.是否有另一种方法可以将此数据输入 var 城市，以便我可以如下所示使用它？

    {
      "city": "New York",
      "state": "NY",
      "desc": "Google NYC",
      "lat": 40.7418,
      "long": -74.0045
    }

非常感谢任何帮助

Angular .js

//Angular App Module and Controller
var sampleApp = angular.module('mapsApp', []);

   var cities = $http.get('/locations').success(function (data){
    $scope.items = data.items;
    })

    var mapOptions = {
        zoom: 8,
        center: new google.maps.LatLng(41.5, -73),
        mapTypeId: google.maps.MapTypeId.TERRAIN
    }

    $scope.map = new google.maps.Map(document.getElementById('map'), mapOptions);

    $scope.markers = [];

    var infoWindow = new google.maps.InfoWindow();

    var createMarker = function (info) {

        var marker = new google.maps.Marker({
            map: $scope.map,
            position: new google.maps.LatLng(info.lat, info.long),
            title: info.city
        });
        marker.content = '<div class="infoWindowContent">' + info.desc +          '</div>';

        google.maps.event.addListener(marker, 'click', function () {
            infoWindow.setContent('<h2>' + marker.title + '</h2>' + marker.content);
            infoWindow.open($scope.map, marker);
        });
        $scope.markers.push(marker);
    }

    for (i = 0; i < cities.length; i++) {
        createMarker(cities[i]);
    }
    $scope.openInfoWindow = function (e, selectedMarker) {
        e.preventDefault();
        google.maps.event.trigger(selectedMarker, 'click');
    }
});

googleMaps.html

<!DOCTYPE html>
<html ng-app="mapsApp">
<head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    <link rel="stylesheet" href="css/maps.css">
    <script            src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js">    </script>
    <script
            src="http://maps.googleapis.com/maps/api/js?sensor=false&language=en"></script>
    <script type="text/javascript" src="js/maps.js"></script>
</head>
<body>
<div ng-controller="MapCtrl">
    <div id="map"></div>
    <div id="repeat" ng-repeat="marker in markers | orderBy : 'title'">
        <a id="country_container" href="#" ng-click="openInfoWindow($event, marker)">
            <label id="names" >{{marker.title}}</label></a>
    </div>
    <ul>
        <li ng-repeat="item in items">
            {{item}}
        </li>
    </ul>
</div>
</body>
</html>

应用程序.js

//Rest HTTP stuff
var express = require('express');
var bodyParser = require('body-parser');
var dbGoogle = require('./dbGoogle');
var app = express();

// configure body parser
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());

var port = process.env.PORT || 8080; // set our port

// create our router
var router = express.Router();

// middleware to use for all requests
router.use(function (req, res, next) {
    // do logging
console.log('Incoming request..');
next();
});

// test route to make sure everything is working
router.get('/', function (req, res) {
res.json({message: 'Welcome!'});
});
router.route('/locations')

// get all the locations
.get(function (req, res) {
        dbGoogle.getGoogles(function (err, data) {
            if (data) {
                res.json({
                    status: '200',
                    items: data
               });
            } else {
               res.json(404, {status: err});
           }
        });
    })
// Register routes
app.use('', router);

//Serve static content files
app.use(express.static('public'));

// START THE SERVER
app.listen(port);
console.log('Running on port ' + port);

db.js

var mysql = require('mysql');
var app = require('./app.js');

var pool = mysql.createPool ({
    host: 'localhost',
    user: 'root',
    port: 3306,
    password: 'password',
    database: 'testdb'
});

module.exports.pool = pool;

pool.getConnection(function(err){
    if(!err) {
        console.log("Database is connected\n\n");
    } else {
        console.log(err);
    }
});

dbGoogle.js

var db = require('./db.js');

var getGoogles = function getGoogles(callback) {
    db.pool.getConnection(function (err, connection) {
        // Use the connection
        connection.query('SELECT * FROM locations', function(err, results){
            if (!err) {
                if (results != null) {
                    callback(null, results);
                } else {
                    callback(err, null);
                }
            } else {
                callback(err, null);
            }
            //release
            connection.release();
        });

    });
}

module.exports.getGoogles = getGoogles;

最佳答案

尝试创建异步标记，比如

$http.get('/locations').success(function (data){
    angular.forEach(data.items, function(item) {
        createMarker(item);
    });
})

关于javascript - 获取 http.get 数据到本地 JSON 数组变量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34259847/

25 4 0
文章推荐： c# 从字节数组创建 xml
文章推荐： c# - TextRenderer.MeasureText 和 Graphics.MeasureString 的大小不匹配
文章推荐： c# - 静态方法中的局部变量线程安全吗？
文章推荐： javascript - 甲骨文顶点 : Javascript code in PL/SQL Block
数据小太阳
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com