drsqpko5286 2018-04-02 21:13 采纳率: 0%
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如何使用Highcharts显示数据库中的历史数据和实时数据

I am having difficulty figuring out how to use Highcharts to get new(live) data from a database.

I have tested the example here and it works great.

I get new data written to the database every 1min. The problem is I can only make it grab the newly inserted data from the database and update the chart every 1min, using the newly inserted data as the new data point. I can't get it to show historical data from the database.

Here is an example of what I'm trying to do.

Here is the code I´m using at the moment.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
  var chart;
 $(document).ready(function() {
     var options = {
        chart: {
          renderTo: 'container',
          type: 'area',
          zoomType: 'x'
        },
        title: {
        },
        xAxis: {
           type: 'datetime'
        },
        yAxis: {
        },
        series: [{
           name: 'Download',
           data: []
       }, {
           name: 'Upload',
           data: []
        }]
     }; 
     $.getJSON('data.php', function(json) {
        data1 = [];
        data2 = [];
        $.each(json, function(key,value) {
        data1.push([value[0], value[1]]);
        data2.push([value[0], value[2]]);
        });

        options.series[0].data = data1;
        options.series[1].data = data2;
        chart = new Highcharts.stockChart(options);
     });
  });
</script>

<body>
 <div id="container" style="min-width: 400px; height: 800px; margin: 0 auto"></div>

</body>

<script src="https://code.highcharts.com/stock/highstock.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/data.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

And here is the code for data.php.

<?php

    $dbhost = 'localhost';
    $dbname = 'highchart';  
    $dbuser = '*******';                  
    $dbpass = '*******'; 

    try{

        $dbcon = new PDO("mysql:host={$dbhost};dbname={$dbname}",$dbuser,$dbpass);
        $dbcon->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    }catch(PDOException $ex){

        die($ex->getMessage());
    }

    $stmt=$dbcon->prepare("SELECT * FROM trafico");
    $stmt->execute();
    $json = [];
    while($row=$stmt->fetch(PDO::FETCH_ASSOC)){
        extract($row);
        $json[]= [strtotime($time_1m)*1000, (int)$Tx, (int)$Rx];
    }
    echo json_encode($json);
?>

This is the output I get from data.php.

[[1521071984000,1255,91],[1521072190000,1212,92],[1521072241000,1220,93],[ ... ]]

This is the graph I get sample graph

Basically I don't know to how to make the code (this graph) above to update dynamically every 1min with new data points.

  • 写回答

1条回答 默认 最新

  • doukui7574 2018-04-04 20:10
    关注

    Problem solved.

    This is the code I added:

      events: {
    load: function requestData() {

        $.ajax({
            url: 'live.php',
            success: function(points) {
                var series = chart.series,
                shift;

                $.each(series, function(i, s) {
                    shift = s.data.length > 1;
                    s.addPoint(points[i], true, true);
                });
                setTimeout(requestData, 1000);   
                chart.redraw(); 
            },
            cache: false
        });

    }
    }

    Now I have historical data from my DB and it adds new data point every time there's a new entry in de DB without the need to refresh the page.

    Here is is my live.php code:

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

    $dbhost = 'localhost';
    $dbname = 'highchart';  
    $dbuser = '*******';                  
    $dbpass = '*******'; 


    try{

        $dbcon = new PDO("mysql:host={$dbhost};dbname={$dbname}",$dbuser,$dbpass);
        $dbcon->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    }catch(PDOException $ex){

        die($ex->getMessage());
    }

    $stmt=$dbcon->prepare("SELECT * FROM trafico");
    $stmt->execute();
    $json = [];
    while($row=$stmt->fetch(PDO::FETCH_ASSOC)){
        extract($row);
            }
        $json[]= [strtotime($time_1m)*1000, (int)$Tx];
        $json[]= [strtotime($time_1m)*1000, (int)$Rx];

    echo json_encode($json);
?>

    This is the output from live.php:

    [[1522869181000,872],[1522869181000,54]]

    and this is how the code looks now 

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">

  var chart;
 $(document).ready(function() {

        Highcharts.setOptions({
            time: {
                timezoneOffset: 3 * 60
            }
        });

     var options = {
        chart: {
          renderTo: 'container',
          type: 'area',
          zoomType: 'x',
          events: {
            load: function requestData() {

                $.ajax({
                    url: 'live.php',
                    success: function(points) {
                        var series = chart.series,
                            shift;

                        $.each(series, function(i, s) {
                            shift = s.data.length > 1;
                            s.addPoint(points[i], true, true);
                        });
                        setTimeout(requestData, 1000);   
                        chart.redraw(); 
                    },
                    cache: false
                });

            }
            }
        },
        title: {
        },
        xAxis: {
           type: 'datetime'
        },
        yAxis: {
        },
        series: [{
           name: 'Download',
           data: []
       }, {
           name: 'Upload',
           data: []
        }]
     }; 
     $.getJSON('data.php', function(json) {
        data1 = [];
        data2 = [];
        $.each(json, function(key,value) {
        data1.push([value[0], value[1]]);
        data2.push([value[0], value[2]]);
        });

        options.series[0].data = data1;
        options.series[1].data = data2;
        chart = new Highcharts.stockChart(options);
     });
  });
</script>

<body>
 <div id="container" style="min-width: 400px; height: 800px; margin: 0 auto"></div>

</body>

<script src="https://code.highcharts.com/stock/highstock.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/data.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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