How do I display multiple stacked columns for each date range in an stacked Bar

风流意气都作罢 提交于 2019-12-01 10:51:22

To add weeks/textual data underneath the columns you have to add the library's categories file jquery.flot.categories.min.js to your javascript assets.

If i understand you correctly you want the chart to look like this

Javascript

You need to add these files in

<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>

and initialize the library we will talk about $output after this code

<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

First you need to query the database to find the date between the specified dates, after getting the result you have to sort the data for each week in an array

For instance week One => 'good','good','bad','bad', 'week two' => and so on ...

after that you can use array_count_values() to count the number of occurrences and build the charts column.

I simplified the code using functions to make it easier for you

<?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));
}  

now you can easily use these functions like this

$numberOfWeeks = getNumberofWeeks($_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";  

Full working Example

<!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> 

Edit

Just replace these two functions to make it compatible with dd/mm/yyyy

 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;
}

and

   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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