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スタックバーの日付範囲ごとに複数のスタック列を表示するにはどうすればよいですか

    weeks /textual を追加するには 列の下のデータは、ライブラリのカテゴリファイルjquery.flot.categories.min.jsを追加する必要があります javascriptアセットに。

    私があなたを正しく理解しているなら、あなたはチャートをこのように見せたいでしょう

    Javascript

    これらのファイルを追加する必要があります

    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="jquery.flot.min.js"></script>
<script src="jquery.flot.categories.min.js"></script>
<script src="jquery.flot.stack.min.js"></script>

    $outputについて説明するライブラリを初期化します。 このコードの後

    <div id="placeholder" style="width:818px;height:413px" ></div>
<script type="text/javascript">
$(function() {
    var series = [<?php echo $output; ?>];
       $.plot("#placeholder", series, {
        series: {
            stack:true,
            lines:{fill:true,show:false,steps:false},
            bars: {
                show: true,
                barWidth: 0.8,
                align: "middle",
            },
        },
        xaxis: {
            mode: "categories",
            minTickSize: 1
        }
       });
});

    PHP

    まず、データベースにクエリを実行して、指定した日付の間の日付を見つける必要があります。結果を取得した後、各週のデータを配列で並べ替える必要があります

    たとえば、week One => 'good','good','bad','bad', 'week two' => and so on ...

    その後、 array_count_values()を使用できます。 発生数をカウントし、チャート列を作成します。

    functionsを使用してコードを簡略化しました 簡単にするために

    <?php
$con = mysqli_connect("localhost", 'root','','your db');

function getChartData($con, $startDate, $endDate){

    $startDate = date("Y-m-d H:i:s", strtotime($startDate));
    $endDate = date("Y-m-d H:i:s", strtotime($endDate));

    $query = "SELECT * FROM `employees` WHERE `date` BETWEEN '$startDate' AND '$endDate'";

    $result = mysqli_query($con, $query) or die ("Error: ".mysqli_error($con));

    // a multidimenional array containing each week with it's
    $weeksData = [];

    // Group each week with it's data 
    while($row = mysqli_fetch_array($result)){
        $weekNumber = date("W", strtotime($row['date']));
        if(isset($weeksData[$weekNumber]))
        {
            $weeksData[$weekNumber][] = $row['level'];
        }
        $weeksData[$weekNumber][] = $row['level'];
    }

    // reset array indexes and sort the array
    sort($weeksData);

    $data = array();

    // using array_count_values to count the number of (good, bad and excellent)
    foreach ($weeksData as $key => $week) {
        $data[$key] = array_count_values($week);
    }

    // return all the weeks with number of (good, bad and excellent) occurences 
    return $data;
}

// build the javascript object {data:['week num', occuerences]}
function buildColumn($data,$label, $numberOfWeeks)
{
    $data = array_column($data,strtolower($label));
    $balance = $numberOfWeeks - count($data);
    if($balance !=0){ 
        for($i=1;$i<=$balance;$i++) { 
            $data[] = 1; 
        } 
    }

    $string = '{data: [';
    foreach ($data as $key => $value) {
        $weekNumber = $key+1;
        $string .= '["Week '.$weekNumber.'",'.$value.'],';
    }
    $string = rtrim($string, ',');
    $string .= "],valueLabels: {show: true,valign: 'middle'},label: '$label'}";
    return $string;
}

function getNumberofWeeks($startDate, $endDate){
      $weeks = array();
      $period = new DatePeriod(new DateTime($startDate),
        DateInterval::createFromDateString('+1 day'),new DateTime($endDate) 
      );
      foreach ( $period as $dt ) {
        $weeks[] = $dt->format( 'W' );
      }
      return count(array_unique($weeks));
}

    これで、これらの関数を次のように簡単に使用できます

    $numberOfWeeks = getNumberofWeeks($_POST['start'],$_POST['end']);

// get data of the last number of weeks
$chartData = getChartData($con, $_POST['start'],$_POST['end']);
// bulding columns data for each occurence
$badColumn = buildColumn($chartData,'Bad', $numberOfWeeks);
$goodColumn = buildColumn($chartData,'Good', $numberOfWeeks);
$excellentColumn = buildColumn($chartData,'Excellent', $numberOfWeeks);

// output {data: ...}, {data: ...},{data:....}
$output = "$excellentColumn , $goodColumn , $badColumn";

    完全な実例

    <!DOCTYPE html>
<html>
<head>
    <title></title>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script src="jquery.flot.min.js"></script>
    <script src="jquery.flot.categories.min.js"></script>
    <script src="jquery.flot.stack.min.js"></script>
</head>
<body>
<?php
$con = mysqli_connect("localhost", 'root','','your db');

function getChartData($con, $startDate, $endDate){

    $startDate = date("Y-m-d H:i:s", strtotime($startDate));
    $endDate = date("Y-m-d H:i:s", strtotime($endDate));

    $query = "SELECT * FROM `employees` WHERE `date` BETWEEN '$startDate' AND '$endDate'";

    $result = mysqli_query($con, $query) or die ("Error: ".mysqli_error($con));

    // a multidimenional array containing each week with it's
    $weeksData = [];

    // Group each week with it's data 
    while($row = mysqli_fetch_array($result)){
        $weekNumber = date("W", strtotime($row['date']));
        if(isset($weeksData[$weekNumber]))
        {
            $weeksData[$weekNumber][] = $row['level'];
        }
        $weeksData[$weekNumber][] = $row['level'];
    }

    // reset array indexes and sort the array
    sort($weeksData);

    $data = array();

    // using array_count_values to count the number of (good, bad and excellent)
    foreach ($weeksData as $key => $week) {
        $data[$key] = array_count_values($week);
    }

    // return all the weeks with number of (good, bad and excellent) occurences 
    return $data;
}

// build the javascript object {data:['week num', occuerences]}
function buildColumn($data,$label, $numberOfWeeks)
{
    $data = array_column($data,strtolower($label));
    $balance = $numberOfWeeks - count($data);
    if($balance !=0){ 
        for($i=1;$i<=$balance;$i++) { 
            $data[] = 1; 
        } 
    }

    $string = '{data: [';
    foreach ($data as $key => $value) {
        $weekNumber = $key+1;
        $string .= '["Week '.$weekNumber.'",'.$value.'],';
    }
    $string = rtrim($string, ',');
    $string .= "],valueLabels: {show: true,valign: 'middle'},label: '$label'}";
    return $string;
}

function getNumberofWeeks($startDate, $endDate){
      $weeks = array();
      $period = new DatePeriod(new DateTime($startDate),
        DateInterval::createFromDateString('+1 day'),new DateTime($endDate) 
      );
      foreach ( $period as $dt ) {
        $weeks[] = $dt->format( 'W' );
      }
      return count(array_unique($weeks));
}
// the number of weeks that you want to display in the chart
$numberOfWeeks = getNumberofWeeks($_POST['start'],$_POST['end']);

// get data of the last number of weeks
$chartData = getChartData($con, $_POST['start'],$_POST['end']);
// bulding columns data for each occurence
$badColumn = buildColumn($chartData,'Bad', $numberOfWeeks);
$goodColumn = buildColumn($chartData,'Good', $numberOfWeeks);
$excellentColumn = buildColumn($chartData,'Excellent', $numberOfWeeks);

// output {data: ...}, {data: ...},{data:....}
$output = "$excellentColumn , $goodColumn , $badColumn";

?>
<div id="placeholder" style="width:818px;height:413px" ></div>
<script type="text/javascript">
$(function() {
    var series = [<?php echo $output; ?>];
       $.plot("#placeholder", series, {
        series: {
            stack:true,
            lines:{fill:true,show:false,steps:false},
            bars: {
                show: true,
                barWidth: 0.8,
                align: "middle",
            },
        },
        xaxis: {
            mode: "categories",
            minTickSize: 1
        }
       });
});
  </script>
 </body>
</html>

    編集

    これらの2つの関数を置き換えるだけで、dd/mm/yyyyと互換性があります。 

     function getChartData($con, $startDate, $endDate){
    $startDate = explode('/', $startDate);
    $startDate = $startDate[1] . '/' . $startDate[0] . '/' . $startDate[2];

    $endDate = explode('/', $endDate);
    $endDate = $endDate[1] . '/' . $endDate[0] . '/' . $endDate[2];

    $startDate = date("Y-m-d H:i:s", strtotime($startDate));
    $endDate = date("Y-m-d H:i:s", strtotime($endDate));

    $query = "SELECT * FROM `employees` WHERE `date` BETWEEN '$startDate' AND '$endDate'";

    $result = mysqli_query($con, $query) or die ("Error: ".mysqli_error($con));

    // a multidimenional array containing each week with it's
    $weeksData = [];

    // Group each week with it's data 
    while($row = mysqli_fetch_array($result)){
        $weekNumber = date("W", strtotime($row['date']));
        if(isset($weeksData[$weekNumber]))
        {
            $weeksData[$weekNumber][] = $row['level'];
        }
        $weeksData[$weekNumber][] = $row['level'];
    }

    // reset array indexes and sort the array
    sort($weeksData);

    $data = array();

    // using array_count_values to count the number of (good, bad and excellent)
    foreach ($weeksData as $key => $week) {
        $data[$key] = array_count_values($week);
    }

    // return all the weeks with number of (good, bad and excellent) occurences 
    return $data;
}

    および

       function getNumberofWeeks($startDate, $endDate){
    $startDate = explode('/', $startDate);
    $startDate = $startDate[1] . '/' . $startDate[0] . '/' . $startDate[2];

    $endDate = explode('/', $endDate);
    $endDate = $endDate[1] . '/' . $endDate[0] . '/' . $endDate[2];
    $diff = strtotime($startDate, 0) - strtotime($endDate, 0);

    return str_replace('-','', (int)floor($diff / 604800));
}



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