javascript - Highcharts Spline 未绘制前 30 个点的图形线。

Question

我有一个效果很好的 highcharts 样条图。我改变了一些 ajax 调用，现在它不会绘制连接前 30 个左右点的线。它只是绘制点一段时间，然后线条就出现了。我更关心线条而不是点。

有谁知道为什么会这样吗？请参阅下面我的代码。预先感谢您的任何帮助!

var results_a;
var results_b;
var flag_a = 1;
var flag_b = 1;
var current_a;
var current_b;
var previous_a = 0;
var previous_b = 0;
var xmlhttp_a;
var xmlhttp_b;
var url_a = "http://mysite.com/web/johnsNumber.txt"; 
var url_b = "http://mysite.com/web/johnsNumber.txt";
////////////////////////////////////////////////////////////////////////////////////////////////////////         
function loadFirstDoc(url_a,cfunc)
{
  if (window.XMLHttpRequest)
    {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp_a=new XMLHttpRequest();
    }
  else
  {// code for IE6, IE5
    xmlhttp_a=new ActiveXObject("Microsoft.XMLHTTP");
  }
  xmlhttp_a.onreadystatechange=cfunc;
  xmlhttp_a.open("GET",url_a,true);
  xmlhttp_a.send();
}

function myFunction_a()
{
  loadFirstDoc(url_a,function()
    {
       if (xmlhttp_a.readyState==4 && xmlhttp_a.status==200)
        {
            current_a = parseInt(xmlhttp_a.responseText);
            flag_a = 1;
        }
    });
}
////////////////////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////////   
function loadSecondDoc(url_b,cfunc)
{
  if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp_b=new XMLHttpRequest();
  }
  else
  {// code for IE6, IE5
    xmlhttp_b=new ActiveXObject("Microsoft.XMLHTTP");
  }
    xmlhttp_b.onreadystatechange=cfunc;
    xmlhttp_b.open("GET",url_b,true);
    xmlhttp_b.send();
}

function myFunction_b()
{
loadSecondDoc(url_b,function()
  {
     if (xmlhttp_b.readyState==4 && xmlhttp_b.status==200)
     {
        current_b = parseInt(xmlhttp_b.responseText);
        flag_b = 1;
     }
  });
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////

function randInRange(start, end){
   return Math.floor(Math.random() * (end-start+1) + start);
}

function is_numeric(input){
    return !isNaN(input);
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////////////////////////////////////////////////////
/*js for first graph....container*/
$(function () {
    $(document).ready(function() {
        // Apply the grey theme
        Highcharts.setOptions({
           colors: ["#B00000"],

        });

        Highcharts.setOptions({
            global: {
                useUTC: false
            }
        });

        var chart;
        $('#container').highcharts({
            chart: {
                type: 'spline',
                animation: Highcharts.svg, // don't animate in old IE
                marginRight: 10,
                events: {
                    load: function() {

                        // set up the updating of the chart each second
                        var series = this.series[0];
                        setInterval(function() {

                            myFunction_a(); //ajax call

                            //check  if flag has been set...if so, then random number
                            if(flag_a == 1){
                                results_a = current_b;
                             ; //results_a = randInRange(1, 5);
                            }
                            //flag not set so results = 0
                            else{
                              results_a = 0;
                            }
                            //Need to write to a text file right here
                            var x = (new Date()).getTime(), // current time
                                y = results_a;
                                series.addPoint([x, y], true, true);
                            //series.addPoint([x, y], true, true);
                            previous_a = current_a;
                            flag_a = 0;
                        }, 1500);
                    }
                }
            },
            title: {
                text: 'Linux Server Sales Graph',
                style: {
                  color: '#B00000',
                  font: 'bold 20px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
                }            
            },
            xAxis: {
                type: 'datetime',
                tickPixelInterval: 150
            },
            yAxis: {
                min: -1,
                max: 6,
                title: {
                    text: 'Sales'
                },
                plotLines: [{
                    value: 0,
                    width: 1,
                    color: '#000',
                }]
            },
            tooltip: {
                formatter: function() {
                        return '<b>'+ this.series.name +'</b><br/>'+
                        Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) +'<br/>'+
                        Highcharts.numberFormat(this.y, 2);
                }
            },
            legend: {
                enabled: false
            },
            exporting: {
                enabled: false
            },
            series: [{
                name: 'sales/sec',
                data: (function() {
                    // generate an array of random data
                    var data = [],
                        time = (new Date()).getTime(),
                        i;

                    for (i = -19; i <= 0; i++) {
                        data.push({
                            x: time + i * 1000,
                            y: randInRange(1, 5)
                        });
                    }
                    return data;
                })()
            }]
        });
    });

});
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*script for the second graph...container2*/
$(function () {
    $(document).ready(function() {
        Highcharts.setOptions({
           colors: ["#0000FF"],
        });
        Highcharts.setOptions({
            global: {
                useUTC: false
            }
        });

        var chart;
        $('#container2').highcharts({
            chart: {
                type: 'spline',
                animation: Highcharts.svg, // don't animate in old IE
                marginRight: 10,
                events: {
                    load: function() {

                        // set up the updating of the chart each second
                        var series = this.series[0];
                        setInterval(function() {
                            myFunction_b();
                            if(flag_b == 1){
                                results_b = current_b;
                              //results_b = randInRange(1, 5);
                            }
                            else{
                              results_b = 0;
                            }
                           //need to write to text file right here
                            var x = (new Date()).getTime(), // current time
                                y = results_b;
                            //series.addPoint([x, y], true, true);
                            series.addPoint([x, y], true, true);
                            previous_b = current_b;
                            flag_b = 0;
                        }, 1500);
                    }
                }
            },
            title: {
                text: 'Windows Server Sales Graph',
                style: {
                  color: '#0000FF',
                  font: 'bold 20px Lucida Grande, Lucida Sans Unicode, Verdana, Arial, Helvetica, sans-serif'
                }   
            },
            xAxis: {
                type: 'datetime',
                tickPixelInterval: 150
            },
            yAxis: {
                min: -1,
                max: 6,
                title: {
                    text: 'Sales'
                },
                plotLines: [{
                    value: 0,
                    width: 1,
                    color: '#000',
                }]
            },
            tooltip: {
                formatter: function() {
                        return '<b>'+ this.series.name +'</b><br/>'+
                        Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) +'<br/>'+
                        Highcharts.numberFormat(this.y, 2);
                }
            },
            legend: {
                enabled: false
            },
            exporting: {
                enabled: false
            },
            series: [{
                name: 'sales/sec',
                data: (function() {
                    // generate an array of random data
                    var data = [],
                        time = (new Date()).getTime(),
                        i;

                    for (i = -19; i <= 0; i++) {
                        data.push({
                            x: time + i * 1000,
                            y: randInRange(1, 5)
                        });
                    }
                    return data;
                })()
            }]
        });
    });

});
/////////////////////////////////////////////////////////////////////////////////////////////////////////////

Answer 1

1)在第一个图表中:

 if(flag_a == 1){
     results_a = current_b;
     //results_a = randInRange(1, 5);
 }

不应该存在current_a吗？

2)我创建了简单的图表:http://jsfiddle.net/3bQne/102/与你的选择。唯一的区别是值始终相同。正如您所看到的，它工作得很好。

3) 控制台有什么错误吗？尝试更新我的示例以重现问题。