CodeIgniter 和 Google 图表 - 基于 mysql 值的下拉菜单

Question

我正在使用代码点火器、google 图表以及 php 和 MySQL 来显示图表。它使用固定查询工作。我正在尝试添加一个下拉菜单以根据所选选项（sql 列 "status"）显示图表 这是我到目前为止所拥有的。我如何修改它以接受下拉值？

model.php

public function get_chart_data()  
{
    $query = $this->db->get($this->db_mgmt);
    $this->db->select('rating, COUNT(rating) AS Count');
    $this->db->from('db_mgmt');
    $this->db->where('status =', $status);
    $this->db->group_by('rating'); 
    $query = $this->db->get();
    $results['chart'] = $query->result();
}

controller.php

$this->load->model('model', 'chart');
public function index() {
        $results = $this->chart->get_chart_data();
        $data['chart'] = $results['chart'];
        $this->load->view('index.php', $data);
}

view.php

<?php 
foreach ($chart as $object) {
$open_all[] = "['".$object->rating."', ".$object->Count."]";
}
?>

  google.load("visualization", "1", {packages:["corechart"]});
  google.setOnLoadCallback(drawChart_open);

   function drawChart_open() {
    // Create the data table.
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Rating');
    data.addColumn('number', 'Count');
    data.addRows([
    <?php echo implode(",", $open_all);?>
    ]);

    var options = {
      pieSliceText: 'value-and-percentage',
    };

    var chart = new google.visualization.PieChart(document.getElementById('open_div'));
    chart.draw(data, options);

  }

  <div id="open_div" class="chart"></div>

提前致谢！

更新：

我已经使用 ajax 尝试了以下方法，但它似乎不起作用。我绝对确定我在这里做错了什么，但不确定在哪里。在 chrome 中使用 Inspect 也不会给出任何错误。

model.php

public function fetch_result($status)  
  {
    $query = $this->db->get($this->db_mgmt);
    $this->db->select('rating, COUNT(status) AS Status_Count');
    $this->db->from('db__mgmt');
    $this->db->where('status =', $status);
    $this->db->group_by('rating'); 
    $query = $this->db->get();
    return $query;
  }

controller.php

$this->load->model('model', 'chart');
public function mychart() {

if(!empty($_POST["val"])) {
    $val=$_POST["val"];
    $result_new=$this->chart->fetch_result($val);

    $array = array();
    $cols = array();
    $rows = array();
    $cols[] = array("id"=>"","label"=>" Rating","pattern"=>"","type"=>"string");
    $cols[] = array("id"=>"","label"=>"Count","pattern"=>"","type"=>"number");  

    foreach ($result_new as $object) {
      $rows[] = array("c"=>array(array("v"=>$object->risk_rating,"f"=>null),array("v"=>(int)$object->Status_Count,"f"=>null)));
   }

    $array = array("cols"=>$cols,"rows"=>$rows);
    echo json_encode($array);

    }

}

view.php

function drawChart_open_all(num) {         
    var PieChartData = $.ajax({
    type: "POST",
    url: "<?php echo base_url(); ?>" + "dashboard/chart/mychart",
    data:'val='+num,
    dataType:"json"
    }).responseText;

    alert(PieChartData);


    // Create the data table.
    var data = new google.visualization.DataTable(PieChartData);
    var options = {
              pieSliceText: 'value-and-percentage',       
    };

    var chart = new google.visualization.PieChart(document.getElementById('open_new'));
    chart.draw(data, options);

  }

<div><span> <b>Pie Chart<br /><br /></span></div>
<form>
  <select name="status" onchange="drawChart_open_all(this.value)">
<option value="WIP">WIP</option>
<option value="Close">Close</option>
  </select>
</form>
<div id="open_new" class="chart"></div>

提前致谢！！

Answer 1

我 认为 最简单的方法是发送一个带有 <option> 值

的 GET 请求

首先，回到你的第一个版本。

接下来，在您的 onchange 事件中发送值

function drawChart_open_all(num) {
  location = "<?php echo base_url(); ?>" + "dashboard/chart/mychart?option=" + num;
}

然后在模型中--
get_chart_data()

您应该能够使用 --
访问该值 $_GET['option']

使用它来修改您的查询

这是一个具有类似概念的旧答案——不同之处在于它使用 POST 与 GET
以及一个 <form> 和一个 <input type="submit"> 按钮来发送请求
How to pass JavaScript variables to PHP?

Answer 2

我设法找出问题所在，最后使用了ajax。 @WhiteHat 解决方案也朝着正确的方向发展。谢谢！

model.php

public function fetch_result($status)  
  {
    $query = $this->db->get($this->db_mgmt);
    $this->db->select('rating, COUNT(status) AS status_count');
    $this->db->from('db_mgmt');
    $this->db->where('status =', $status);
    $this->db->group_by('rating'); 
    $query = $this->db->get();

    $results_new = $query->result();  // <-- Forgot to add this!
    return $results_new;
  }

controller.php

$this->load->model('model', 'chart');

public function mychart() {

if(!empty($_POST['option'])) {     

$val = $_POST['option'];            
$result_new=$this->chart->fetch_result($val);

$array = array();
$cols = array();
$rows = array();
$cols[] = array("id"=>"","label"=>" Rating","pattern"=>"","type"=>"string");
$cols[] = array("id"=>"","label"=>"Count","pattern"=>"","type"=>"number");  

foreach ($result_new as $object) {
  $rows[] = array("c"=>array(array("v"=>(string)$object->rating),array("v"=>(int)$object->status_count)));
}

$array = array("cols"=>$cols,"rows"=>$rows);
echo json_encode($array);

}
}

view.php

   function drawChart_open_all(status) {

    var PieChartData = $.ajax({
    type: 'POST',
    url: "<?php echo base_url(); ?>" + "dashboard/chart/mychart",
    data: { 'option':status },  // <-- kept as option instead of val
    dataType:"json",
    global: false,              // <-- Added 
    async:false,                // <-- Added 
    success: function(data){    // <-- Added 
    return data;                // <-- Added 
    },
    error: function(xhr, textStatus, error){
        console.log(xhr.statusText);
        console.log(textStatus);
        console.log(error);
    }
    }).responseText;

    // Create the data table.
    var data = new google.visualization.DataTable(PieChartData);
    var options = {  pieSliceText: 'value-and-percentage', };

    var chart = new google.visualization.PieChart(document.getElementById('open_new'));
    chart.draw(data, options);
  }

<div><span> <b>Pie Chart<br /><br /></span></div>
<form>
<select name="status" onchange="drawChart_open_all(this.value)">
<option value="WIP">WIP</option>
<option value="Close">Close</option>
</select>
</form>
<div id="open_new" class="chart"></div>