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php - 从 PHP 类访问 HTML div id

问题描述

我正在尝试学习 PHP/Ajax，但我遇到了困难。我试图让我的 AJAX 请求的结果呈现在我的 PHP 类之外声明的 div 元素中。

我有一个 PHP 文件，其中包含一个名为 的类dashboard，一旦它从 ajax 查询接收到 post 变量，它就会处理查询数据库，如下所示

public function loadTeamMembersChart($teamID, $lecturer_id, $teamColour){


 $db = $this -> db;

 if (!empty ($teamID) && !empty ($lecturer_id)){

     $result = $db -> loadTeamMembersChart($teamID, $lecturer_id);

     if ($result) {


        $response["teamMember"] = $result;

        $teamMembers = $_SESSION["teamMember"] = $result;

        //Pass the results to the below function
        loadTeamMembers($teamMembers, $teamColour);


     } else {

        $response["result"] = "failure";
        $response["message"] = "Unable to Find Team Member Data";
        return json_encode($response);
     }

        } else {

  return $this -> getMsgParamNotEmpty();

        }

     }

然后在同一个 php 文件中，我有一个将结果传递给名为 loadTeamMembers 的全局函数，如下所示。

function loadTeamMembers($teamMembers, $teamColour){    

//start to break up the teamMember object and store in variables

$teamMemberName = $_SESSION['teamMember']['all_team_member_names']; 
$teamMemberPoints = $_SESSION['teamMember']['all_team_member_points'];
$teamMemberStudentNumber = $_SESSION['teamMember']['all_team_member_studentNumbers'];
$teamMemberLastActive = $_SESSION['teamMember']['all_date_last_present'];
$teamMemberTeamID = $_SESSION['teamMember']['all_team_ids'];


// The `$teamMemberData` array holds the chart attributes and data for the team object
        $teamMemberData = array(
            "chart" => array(
              "caption" => "Student Team-Member Progress Chart",
              "xAxisname"=> "Team-Member Name",
              "yAxisName"=> "Points",
              //Configure no.of visible plots
              "numVisiblePlot"=> "5",
              "theme"=> "zune",
              "exportenabled"=> "1",
              "exportMode"=> "server"
            ),

            "categories" => array(
              "category" => array()),

        "dataset" => array(
              "data" => array())
        );



        $teamMemberCount = 0;

         // Push the data into the array
        if (is_array($teamMemberName) || is_object($teamMemberName))
        { 

        foreach($teamMemberName as $key => $value){ 

        array_push($teamMemberData["categories"]["category"], array(
            "label" => $teamMemberName[$teamMemberCount]." ".$teamMemberStudentNumber[$teamMemberCount]." Profile was last active on ".$teamMemberLastActive[$teamMemberCount]));

        array_push($teamMemberData["dataset"]["data"], array(
            "value" => $teamMemberPoints[$teamMemberCount],
            "color"=> $teamColour));


        $teamMemberCount++;
            }
        }


        //encode the built team-member array so that it is returned to the ajax success request
        echo $jsonEncodedTeamMemberData = json_encode($teamMemberData);

}

然后在同一个文件中，但在两个 PHP 类之外，我的 HTML 中有以下脚本：

    <script>

        function getTeamMembers(teamID,lecturer_id, teamColourCode){

        //Variables needed to query the external DB to return required data to populate the charts
         var teamInfo = {

                "teamID" : teamID,
                "lecturer_id" : lecturer_id,
                "teamColourCode" : teamColourCode
            };
        /*
        The below is used for the 'was a student present for the most recent quiz' pie chart. A boolean is set so that the post request knows
        that we only need to call the loadIfTeamMemberWasPresent(); function, as the data was already obtained in the first ajax request. However, we don't want
        to use that data on the first ajax call.
        */
         var teamDetails = {

                "teamClicked" : true
            };


        //Below is the first ajax call
            $.ajax({
            data: teamInfo,  
            url: 'dashboard.php',
            type: 'POST',
            success : function(data) {
            console.log(data) 

            chartData = data;
            apiChart = new FusionCharts({
            type: 'scrollColumn2d',
            renderAt: 'team-member-chart-container',
            width: '550',
            height: '350',
            dataFormat: 'json',
            dataSource: data
            });
            apiChart.render();
        },

        //Once the first ajax call has completed, we can then call the second ajax request to populate the pie-chart graph  
            complete:function(){
            $.ajax({
            data: teamDetails,  
            url: 'dashboard.php',
            type: 'POST',
            success : function(data) {
            console.log(data) 

            chartData = data;
            apiChart = new FusionCharts({
            type: 'pie2D',
            renderAt: 'teamMember-present-container',
            width: '550',
            height: '350',
            dataFormat: 'json',
            dataSource: data
            });
            apiChart.render();
               },
            });
        }
    }); 

        }

</script>

但是，在我写的地方，我$columnChartTeamMember =...无法在名为 的 div id 中访问和呈现我的图表team-member-chart-container。

如果可能的话，我试图在类本身中不包含 HTML，因为其他类中的其他图表也需要在其他 div id 中呈现，例如individual-student-container.

我曾尝试阅读此处找到的 PHP Simple HTML DOM Parser Manual ，但作为初学者，这让我有些困惑。我也不确定这是否是我所追求的。

我的方法基于 fusioncharts 给出的官方文档，可以在这里找到。

如果有人可以就我如何在提到的 div-id 中呈现我的图表提供一些指导，我将不胜感激。

编辑

最后，我设法通过将从我的 PHP 脚本中检索到的数据回显到 AJAX 请求，然后从success调用 ajax 请求构建我的图表来解决我的问题。我已经更新了我的代码以显示这是如何实现的。我省略了对第二个 ajax 请求的处理，因为在第一次调用时已经检索到数据。但是，我还不想检索它，所以我在第一个请求完成后提出了第二个请求。现在一切正常。

标签： phphtmlfusioncharts

解决方案

这方面的东西应该适合你。

PHP 文件： class.teamMember.php

<?php

require_once "fusioncharts.php";

class TeamMember {

  public __construct($data) {
    self::loadTeamMembers($data)
  }

  public function loadTeamMembers($data) {

    $columnChartTeamMember = new \FusionCharts("scrollColumn2d", "teamMemberChart", 500, 300, "team-member-chart-container", "json", json_encode($data));
    $columnChartTeamMember->render();

  }

}

new TeamMember($data);

仍然需要$data从某个地方提供它。看起来你是通过 : 来做的jQuery.post，但是因为你没有运行function: getTeamMembers，teamInfo所以总是空的，所以我把那部分排除在外。

HTML 文件： chart.html

<html>
  <head>
    <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
  </head>
  <body>
    <div id='unique-id'>Charts will load here.</div>
    <script>
      jQuery
        .get('dashboard.php')
        .then(function (data) {
          jQuery('#unique-id').html(data);
        });
    </script>
  </body>
</html>

假设以下是$data（从 FusionCharts 复制/过去）：

$data = "{
  "chart":{  
    "caption":"Harry\'s SuperMart",
    "subCaption":"Top 5 stores in last month by revenue",
    "numberPrefix":"$",
    "theme":"ocean"
  },
  "data":[  
    {  
      "label":"Bakersfield Central",
      "value":"880000"
    },
    {  
      "label":"Garden Groove harbour",
      "value":"730000"
    },
    {  
      "label":"Los Angeles Topanga",
      "value":"590000"
    },
    {  
      "label":"Compton-Rancho Dom",
      "value":"520000"
    },
    {  
      "label":"Daly City Serramonte",
      "value":"330000"
    }
  ]
}";

json_encode你在课堂上不需要它。（换句话说，可以删除）但是现在：

$data = json_decode($data, true);
new TeamMember($data);

它应该显示在#unique-id <div>.

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