如何从CodeIgniter存储的变量中获取JQuery中的值

Question

我有一个图表，我想从模型中存储的变量中获取值。 我的Jquery代码：

var ctx = document.getElementById('myChart').getContext('2d');
   var myChart = new Chart(ctx, {
     type: 'bar',
     data: {
       labels: ['Quality', 'Service', 'Cleanliness', 'Staff'],
       datasets: [{
         label: 'Average Ratings',
         data: [0,1,2,4,5],
         backgroundColor: "rgba(153,255,62,0.6)"
       }]},

   });

我的模特：

 public function chart_data()
    {
        $total = $this->db->query("SELECT 
                     ROUND(count((service_ans_1)+(service_ans_2)+(service_ans_3)+(quality_ans_1)+(quality_ans_2)+(quality_ans_3)+(quality_ans_4)+(cleanliness_ans_1)+(cleanliness_ans_2)+(cleanliness_ans_3)+(cleanliness_ans_4)+(cleanliness_ans_5)+(staff_ans_1)+(staff_ans_2)+(staff_ans_3))) as total from `dine_in_feedback` as f")->row()->total;

        $service    = $this->db->query("SELECT 
                        ROUND(avg(((service_ans_1)+(service_ans_2)+(service_ans_3))/3)) as service from `dine_in_feedback` as f")->row()->service;
        $quality    = $this->db->query("SELECT 
                    ROUND(avg(((quality_ans_1)+(quality_ans_2)+(quality_ans_3)+(quality_ans_4))/4)) as quality from `dine_in_feedback` as f")->row()->quality;
        $clean    = $this->db->query("SELECT 
                    ROUND(avg(((cleanliness_ans_1)+(cleanliness_ans_2)+(cleanliness_ans_3)+(cleanliness_ans_4)+(cleanliness_ans_5))/5)) as clean from `dine_in_feedback` as f")->row()->clean;
        $staff   = $this->db->query("SELECT 
                    ROUND(avg(((staff_ans_1)+(staff_ans_2)+(staff_ans_3))/15)) as staff from `dine_in_feedback` as f")->row()->staff;


        $result['service'] = $service / $total * 100;
        $result['quality'] = $quality / $total * 100;
        $result['clean'] = $clean / $total * 100;
        $result['staff'] = $staff / $total * 100;
        return $result;

    }

我希望在“数据：[0,1,2,4,5]”中提供服务，质量，清洁和员工价值，例如数据：[服务价值，质量价值，清洁价值，员工价值]

Answer 1

首先，您需要从控制器调用模型函数“ chart_data”，例如：

$chart_data= $this->model_name->chart_data();

然后像这样将$ chart_data变量发送到您的视图：

$this->load->view('your view name', $chart_data);

之后，您可以像这样在视图中使用chart_data变量：

    var ctx = document.getElementById('myChart').getContext('2d');
   var myChart = new Chart(ctx, {
     type: 'bar',
     data: {
       labels: ['Quality', 'Service', 'Cleanliness', 'Staff'],
       datasets: [{
         label: 'Average Ratings',
         data: ['<?php echo $chart_data['service'] ?>','<?php echo $chart_data['quality'] ?>','<?php echo $chart_data['clean'] ?>','<?php echo $chart_data['staff'] ?>'],
         backgroundColor: "rgba(153,255,62,0.6)"
       }]},

   });