填充 Google Charts API，得到“列标题行必须是一个数组”。

Question

我想用我的函数中的数据填充 Google 图表。我还定义了标题行，但我得到的是"Column header row must be an array."。我该如何解决？我使用了以下代码。

    var data_coll = "";
    var header_x = "['Skill', 'Scoring']";
    data_coll += header_x+',';
    if (skill_info["category"]==="gCSC")
    {
      qcat = 'gCSC';
      for (var x = 0;x<skill_info["data"].length;x+=1)
      {
        ind_name = skill_info["data"][x]["fn"]+" "+skill_info["data"][x]["ln"];
        if ((x<skill_info["data"].length) && (x>0))
        {
          data_coll += ",";
        }
        data_coll += "['"+ind_name+"',"+skill_info["data"][x]["value"]+"]";
      }
      drawChart(data_coll);

我也试过var header_x = ['Skill', 'Scoring'];和var header_x = array('Skill', 'Scoring';

drawChart 是我用来绘制图表的函数，其中 data_call 会在其中插入 arrayToDataTable() 的数据。

更新： 我有似乎很好的 WhiteHats 解决方案（错误消失了）。所以我现在看到“错误：未定义容器”。 这不应该发生。我使用以下结构：

<div class="container h-100">
  <div class="row h-100 justify-content-center align-items-center">
    <form class="col-12">
      <div class="form-group">
        <div class='elm_emprat pl-3' id="pollingstation"> 
          <div class='btn-group' role='group' aria-label='Basic example'>
            <div  aria-label='Basic example'>
              <div class='btn-group btn-group-toggle' data-toggle='buttons' role='group' id="polloptions">

              </div>
            </div>
          </div> 
      </div>
    </form>   
  </div>  
</div>

我设置了以下

var chart = new google.visualization.BarChart(document.getElementById('polloptions'));

所以元素被定义了。也许我错过了什么？

更新 2： 定义谷歌图表的函数

google.charts.load('current', {'packages':['corechart','bar']});
google.charts.setOnLoadCallback(drawChart);

// Draw the chart and set the chart values
function drawChart(data_coll) {
      var data = google.visualization.arrayToDataTable([
        data_coll
      ]);

      var options = {
        title: 'Company Skill Comparison',
        chartArea: {width: '50%'},
        width: '100%',
        height: '75%',
        colors: ['#343a40'],
        backgroundColor: { fill:'transparent' },
        hAxis: {
          title: 'Scoring',
          minValue: 0,
          viewWindow: {
            max:100,
            min:0
          }
        },
        vAxis: {
          title: 'Skill'
        }
      };

  // Display the chart inside the <div> element with id="piechart"
  var chart = new google.visualization.BarChart(document.getElementById('polloptions'));
  chart.draw(data, options);
}

以及关于 gCSC 部分的巨大成功函数。

function successHandler(data)
{
      console.log(data);
      var skill_info = JSON.parse(data);
      if ((skill_info.status === 1) && (skill_info.category === "cp") && (skill_info.code === 200)) {
        console.log(skill_info)
        console.log("success loading");                
        //var x,y,dsb,data_coll,ind_name,skill_info,qt,qtx,q_set,q_options='';
        for(var x = 0;x<skill_info["data"].length;x+=1)
        {
        var qt = "<div class='pb-3'><h1 class='display-5' data-panel='cp' id='question_text_"+x+"'>"+skill_info["data"][x]["question_text"]+"</h1></div>";
        console.log(skill_info["data"][x]["question_text"]);
        var option_y = '';
          for(var y = 0;y<skill_info["data"][x]["options"].length;y+=1)
          {             
            option_y += "<label class='btn btn-outline-dark'><input type='radio'  name='options_"+skill_info["data"][x]["id"]+"' value='"+skill_info["data"][x]["options"][y]["answer_value"]+"' autocomplete='off'>"+skill_info["data"][x]["options"][y]["answer"]+"</label>";
            console.log(skill_info["data"][x]["options"][y]["answer_value"]);            
          }
          var q_options = '<div class="btn-group btn-group-toggle" data-toggle="buttons" role="group" id="polloptions">'+option_y+'</div>';
          option_y = '';
          if(x==0)
          {
            dsb = " style='display:block' ";
          }
          else
          {
            dsb = " style='display:none' ";
          }
          document.getElementById("pollingstation").innerHTML += "<div class='elm_emprat pl-3 elm_x_"+x+"' id='pollingstation' "+dsb+">"+qt+q_options+"</div>"; 
        }
      }
      else if((skill_info.status === 1) && (skill_info.category !== "cp") && (skill_info.code === 200))
      {
        console.log(skill_info)
        console.log("success loading");                
        var data_coll = [['Skill', 'Scoring']];

        if(skill_info["category"]==="gCSC")
        {
          qcat = 'gCSC';
          skill_info["data"].forEach(function (row) {
            data_coll.push([row["fn"] + " " + row["ln"], row["value"]]);
          });


          console.log(data_coll);
          drawChart(data_coll);
          qtx = "Top "+skill_info["data"][0]["skill"]+" Skillers @ "+skill_info["data"][0]["name"];
          q_set = '<div class="btn-group btn-group-toggle" data-toggle="buttons" role="group" id="polloptions">'+data_coll+'<button class="sbmt_frm">Next</button></div>';          
        }
        else if (skill_info["category"]==="gRU")
        {
          qcat = 'gRU';          
          qtx = "How do you rate "+skill_info["data"][0]["first_name"]+" "+skill_info["data"][0]["last_name"]+"'s "+skill_info["data"][0]["skill"]+" skill?";
          q_options = "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"][0]["id"]+"_"+skill_info["data"][0]["skill_id"]+"' value='1' autocomplete='off'>0-20</label>";
          q_options += "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"][0]["id"]+"_"+skill_info["data"][0]["skill_id"]+"' value='2' autocomplete='off'>21-40</label>";
          q_options += "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"][0]["id"]+"_"+skill_info["data"][0]["skill_id"]+"' value='3' autocomplete='off'>41-60</label>";          
          q_options += "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"][0]["id"]+"_"+skill_info["data"][0]["skill_id"]+"' value='4' autocomplete='off'>61-80</label>";
          q_options += "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"][0]["id"]+"_"+skill_info["data"][0]["skill_id"]+"' value='5' autocomplete='off'>81-100</label>";  
          q_set = '<div class="btn-group btn-group-toggle" data-toggle="buttons" role="group" id="polloptions">'+q_options+'<button class="sbmt_frm">Next</button></div>';
        }
        else if (skill_info["category"]==="gSC")
        {
          qcat = 'gSC';          
          qtx = "Your most recent skill changes";
          q_set = "<button class='sbmt_frm'>Next</button>";
        }    
        else if (skill_info["category"]==="gPM")
        {
          qcat = 'gPM';
          qtx = "Do you know "+skill_info["data"]["first_name"]+" "+skill_info["data"]["last_name"]+" ("+skill_info["data"]["position"]+" @ "+skill_info["data"]["company_name"]+")";
          q_options = "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"]["id"]+"' value='2' autocomplete='off'>Yes</label>";
          q_options += "<label class='btn btn-outline-dark'><input type='radio' name='options_"+skill_info["data"]["id"]+"' value='1' autocomplete='off'>No</label>";          
          q_set = "<div class='btn-group btn-group-toggle' data-toggle='buttons' role='group' id='polloptions'>"+q_options+"<button class='sbmt_frm'>Next</button></div>";
        }               
        var qt = "<div class='pb-3'><h1 class='display-5' id='question_text_0' data-panel='"+qcat+"'>"+qtx+"</h1></div>";
        document.getElementById("pollingstation").innerHTML += "<div class='elm_emprat pl-3 elm_x_"+x+"' id='pollingstation'>"+qt+q_set+"</div>"; 

      }
      else {
         console.log(skill_info);
         console.log("failure loading");
      }  
}

编辑

单行输出示例：

[["Skill","Scoring"],["Jim","3.00"]]

多行输出示例：

[["Skill","Scoring"],["Jim","3.00"],["Reid","5.16"],["Akshay","6.00"]]

Answer 1

整个数据集必须是一个数组，
并且数据集的每一行都必须是一个数组……

数据集应该类似于...

[
  ['Skill', 'Scoring'],
  ['name', 10],
]

如果您使用的是 javascript，则无需构建字符串，
直接建数组就好了……

var data_coll = [['Skill', 'Scoring']];
if(skill_info["category"]==="gCSC")
{
  qcat = 'gCSC';
  skill_info["data"].forEach(function (row) {
    data_coll.push([row["fn"] + " " + row["ln"], row["value"]]);
  });
  drawChart(data_coll);

  ...

---

编辑

看来 drawChart 函数正在从 google 的 load 语句中调用，
在successHandler 函数完成构建内容之前，这里...

google.charts.load('current', {'packages':['corechart','bar']});
google.charts.setOnLoadCallback(drawChart);

// Draw the chart and set the chart values
function drawChart(data_coll) {
  ...

因为每次页面加载只需要加载一次谷歌图表，
我喜欢先加载它，然后再加载页面上的任何其他内容。
另外，google的load语句会等待文件加载，
在调用回调函数之前。
所以这取代了对 jquery 的 $(document).ready 函数的需求，
或标准的window.addEventListener('load', ... 函数。

另一件事，load 语句返回一个承诺，
可以用来代替setOnLoadCallback。

先尝试加载谷歌图表，然后再进行其他操作。
当 promise 返回时，调用加载数据并执行成功处理程序的函数。

google.charts.load('current', {
  packages:['corechart']
}).then(function () {  // this is the promise function to replace the callback

  // call function that loads the data here
  $.ajax or whatever...

});

然后您的drawChart 函数将在成功处理程序中被调用，
创建内容后。

---

注意：如果您使用的是条形图...

google.visualization.BarChart

那么您不需要加载'bar' 包，只需加载'corechart' 包。

'bar'是给他们的材料条形图...

google.charts.Bar

---

编辑 2

因为我们正在构建一个数组数组，
无需在此处包含初始数组...

  var data = google.visualization.arrayToDataTable([
    data_coll
  ]);

改成……

  var data = google.visualization.arrayToDataTable(data_coll);

---

编辑 3

提供的数据在这里似乎可以正常工作，
从数值中删除引号后......

google.charts.load('current', {
  packages: ['corechart']
}).then(function () {
  drawChart([["Skill","Scoring"],["Jim",3.00],["Reid",5.16],["Akshay",6.00]]);
});

function drawChart(data_coll) {
  var data = google.visualization.arrayToDataTable(data_coll);

  var options = {
    title: 'Company Skill Comparison',
    chartArea: {width: '50%'},
    width: '100%',
    height: '75%',
    colors: ['#343a40'],
    backgroundColor: { fill:'transparent' },
    hAxis: {
      title: 'Scoring',
      minValue: 0,
      viewWindow: {
        max:100,
        min:0
      }
    },
    vAxis: {
      title: 'Skill'
    }
  };

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

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="polloptions"></div>