Tilføj dynamiske data til linjediagram fra mysql-database med highcharts

Jeg antager, at du har flere serier i grafen, hvor backend giver et enkelt punkt pr. serie pr. gang.

For nemheds skyld foreslår jeg, at du returnerer tiden i millisekunder. Jeg er ikke for stærk i PHP, men jeg tror, ​​pointen er klar

<?php

header("Content-type: text/json");


 include_once 'include/connection.php';
 $db = new DB_Class(); 


     $query = "select distinct idchip from datatable ";
     $result = mysql_query( $query );
     $rows = array();
     $count = 0;

     while( $row = mysql_fetch_array( $result ) ) {
         $SQL1 =     "SELECT datetime,temperature FROM `datatable` WHERE idchip=".$row['0']." ORDER BY datetime DESC limit 0,1 ";

        $serie = new StdClass;
        $serie->name = $row['0'];
        $result1 = mysql_query($SQL1);

        $points = array();
        while ($rows = mysql_fetch_array($result1)) {
           $points[] = array(strtotime($rows['0']) * 1000, $rows['1']);
        }

        $serie->data = $points;
        $series[] = $serie;
     }


// Create a PHP array and echo it as JSON
$ret = $series;
echo json_encode($ret);
?>

Koden på klientsiden vil være:

var chart;
var chartSeries = {};
var latestTimeReported = {};

function requestData() {

  $.ajax({
    url: 'live-server-data.php',
    success: function(seriesUpdate) {

      //in case initializer of highcharts is too quick - skip the update
      if (!chart) {
        setTimeout(requestData, 1000);
        return;
      }

      $.each(seriesUpdate, function (serieIndex, serieUpdate) {
        var existingSerie = chartSeries[serieUpdate.name];
        var newPoint = serieUpdate.data[0];
        var lastInsertedTime = latestTimeReported[serieUpdate.name];          

        if (lastInsertedTime  && lastInsertedTime < newPoint[0]) {
          console.log('Attempt inserting old data!!!!');
          return;
        }

        latestTimeReported[serieUpdate.name] = newPoint[0];

        if (existingSerie) {
          var shift = existingSerie.data.length > 20;
          existingSerie.addPoint(newPoint , true, shift);
        } else {
          var newSerie = chart.addSeries({                        
            name: serieUpdate.name,
            data: serieUpdate.data
          }, true);
          chartSeries[serieUpdate.name] = newSerie;
        }

      });

      // call it again after one second
      setTimeout(requestData, 1000);
    },
    cache: false
  });
}

$(document).ready(function() {
    chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container',
            defaultSeriesType: 'spline',
            events: {
                load: requestData
            }
        },
        title: {
            text: 'Live random data'
        },
        xAxis: {
            type: 'datetime',
            tickPixelInterval: 150,
            maxZoom: 20 * 1000
        },
        yAxis: {
            minPadding: 0.2,
            maxPadding: 0.2,
            title: {
                text: 'Value',
                margin: 80
            }
        },
        series: []
    });

Du kan se nyt opdateret eksempel herhttp://plnkr.co/edit/OqMofEGDadF9J3Uit8qD