在Chart.js中使用带有Angular.js的JSON

时间:2017-06-20 14:11:07

标签: javascript angularjs json codeigniter chart.js

我有下一个问题 - >当我在我的前端使用由php echo标签打印的编码json字符串时,一切正常,但是当我想将它与angular get函数一起使用时,我不能让它工作。

Codeigniter Controller(后端)

public function getLogs(){
        $this->load->model('Home_model');
        $logs = $this->Home_model->getLogs();
        echo json_encode($logs);
    }

AngularJs Controller(前端)

$http.get('index.php/Welcome/getLogs')
            .then(function (response) {
                json = response.data;
            });


        var chartjsData = [];
        for (var i = 0; i < json.length; i++) {
            chartjsData.push(json[i].aantal);
        }

        var chartjsLabels = [];
        for (var i = 0; i < json.length; i++) {
            chartjsLabels.push(json[i].datum);
        }

        var ctx = document.getElementById('myChart').getContext('2d');
        var myChart = new Chart(ctx, {
            type: 'line',
            data: {
                labels: chartjsLabels,
                datasets: [{
                    label: "Aantal meldingen",
                    borderColor: 'rgb(255, 131, 48)',
                    data: chartjsData,
                    fill: false
                }]
            },
            options: {
                responsive: false
            }

        });

提前致谢!

1 个答案:

答案 0 :(得分:1)

因为$http.get()方法是异步的,所以你需要在$http.get()的回调函数中初始化你的图表,就像这样......

$http.get('index.php/Welcome/getLogs')
   .then(function(response) {
      json = response.data;

      json = JSON.parse(json);  //parse JSON string (if needed)

      var chartjsData = [];
      for (var i = 0; i < json.length; i++) {
         chartjsData.push(json[i].aantal);
      }

      var chartjsLabels = [];
      for (var i = 0; i < json.length; i++) {
         chartjsLabels.push(json[i].datum);
      }

      var ctx = document.getElementById('myChart').getContext('2d');
      var myChart = new Chart(ctx, {
         type: 'line',
         data: {
            labels: chartjsLabels,
            datasets: [{
               label: "Aantal meldingen",
               borderColor: 'rgb(255, 131, 48)',
               data: chartjsData,
               fill: false
            }]
         },
         options: {
            responsive: false
         }

      });
   });