如何使用angularjs从外部文件获取json数据

时间:2016-02-15 07:30:37

标签: angularjs json

我已经关注了url。这里我正在编写数据变量并在指令本身中分配数据。

但我在单独的sample.json文件中有json数据。然后如何将sample.json数据导入angular指令。任何人都可以帮我解决这个问题......

我的js:

angular.module('myApp').directive('multiLine', [
  function() {
    return {
      restrict: 'E',
      scope: {
        data: '='
      },
      link: function(scope, element) {


var data = [
    {
        "City": "New York",
        "Data": [
            {
                "Date": "20111001",
                "Value": "63.4"
            },
            {
                "Date": "20111002",
                "Value": "58.0"
            },
            {
                "Date": "20111003",
                "Value": "53.3"
            }
        ]
    },
    {
        "City": "San Francisco",
        "Data": [
            {
                "Date": "20111001",
                "Value": "62.7"
            },
            {
                "Date": "20111002",
                "Value": "59.9"
            },
            {
                "Date": "20111003",
                "Value": "59.1"
            }
        ]
    },
    {
        "City": "Austin",
        "Data": [
            {
                "Date": "20111001",
                "Value": "72.2"
            },
            {
                "Date": "20111002",
                "Value": "67.7"
            },
            {
                "Date": "20111003",
                "Value": "69.4"
            }
        ]
    }
];

var margin = {
    top: 20,
    right: 80,
    bottom: 30,
    left: 50
},
width = 560 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;

var parseDate = d3.time.format("%Y%m%d").parse;

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    .interpolate("basis")
    .x(function (d) {
    return x(d.Date);
})
    .y(function (d) {
    return y(d.Value);
});

var svg = d3.select(element[0]).append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

color.domain(data.map(function (d) { return d.City; }));

data.forEach(function (kv) {
    kv.Data.forEach(function (d) {
        d.Date = parseDate(d.Date);
    });
});

var cities = data;

var minX = d3.min(data, function (kv) { return d3.min(kv.Data, function (d) { return d.Date; }) });
var maxX = d3.max(data, function (kv) { return d3.max(kv.Data, function (d) { return d.Date; }) });
var minY = d3.min(data, function (kv) { return d3.min(kv.Data, function (d) { return d.Value; }) });
var maxY = d3.max(data, function (kv) { return d3.max(kv.Data, function (d) { return d.Value; }) });

x.domain([minX, maxX]);
y.domain([minY, maxY]);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis)
    .append("text")
    .attr("transform", "rotate(-90)")
    .attr("y", 6)
    .attr("dy", ".71em")
    .style("text-anchor", "end")
    .text("Temperature (ºF)");

var city = svg.selectAll(".city")
    .data(cities)
    .enter().append("g")
    .attr("class", "city");

city.append("path")
    .attr("class", "line")
    .attr("d", function (d) {
    return line(d.Data);
})
    .style("stroke", function (d) {
    return color(d.City);
});

city.append("text")
    .datum(function (d) {
    return {
        name: d.City,
        date: d.Data[d.Data.length - 1].Date,
        value: d.Data[d.Data.length - 1].Value
    };
})
    .attr("transform", function (d) {
    return "translate(" + x(d.date) + "," + y(d.value) + ")";
})
    .attr("x", 3)
    .attr("dy", ".35em")
    .text(function (d) {
        return d.name;
});
 }
    };
  }
]);

4 个答案:

答案 0 :(得分:0)

您可以使用$http。例如:

$http({method: 'GET', url:'path/to/file.json'})
    .then(
        function(json) {
            console.log('result: ', json);
        },
        function(error) {
            Console.warn('An error occured');
        }
    );

您也可以使用$http.get作为便利功能。

答案 1 :(得分:0)

$http注入您的指令:

angular.module('myApp').directive('multiLine', ['$http', function($http) {

使用它的get方法获取文件:

$http.get('file.json').then(
    function resolved (response) {
        console.info('Resolved at ' + new Date());
        // response.data holds your JSON object
    },
    function rejected (response) {
        console.error('Rejected at ' + new Date());
    }
);

参考:https://docs.angularjs.org/api/ng/service/$http#get

答案 2 :(得分:0)

如果要从其他文件获取JSON对象,可以使用http Get方法,如下所示:

app.controller("testController", function($scope, $http) {
   $scope.data= [];
      $http.get('data.json').success(function(data) { 
         $scope.data = data.value;
         console.log(data.value);
      });    
});

点击此链接:https://docs.angularjs.org/api/ng/service/ $ http

答案 3 :(得分:0)

Here I created sample for how to get data from external json. 

Sample Link

myApp.factory('Data', ['$http', function($http) {
   var dataFactory = {};
    dataFactory.getdata = function () {
              return $http.get('your.json');
        };
    return dataFactory;
}]);

myApp.controller('FirstCtrl', function( $scope, Data ){
    Data.getdata().then(function (data) {
        $scope.Data = data.data;
  });
});