Chart.js - 多行图表 - 仅显示最后一张图表
我使用chart.js在一个页面上显示多个折线图。但是，只有最后一个图表显示，即使我将它们称为＃canvas1和＃canvas2。某些东西必须在某个地方发生冲突，我尝试过大多数事情，但没有任何快乐。这是两个图表，它只显示最后一个：
图一
<script type="text/javascript">
var lineChartData = {
labels : ["January","February","March","April","May","June","July","August","September","October","November","December"],
datasets : [
{
label: "Target",
fillColor : "rgba(220,220,220,0.2)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(220,220,220,1)",
data : [160000,175000,185000,180000,185000,185000,185000,195000,200000,0,0]
},
{
label: "Sales",
fillColor : "rgba(151,187,205,0.2)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(151,187,205,1)",
data : [<?php echo $stockJanuary ?>,<?php echo $stockFebruary ?>,<?php echo $stockMarch ?>,<?php echo $stockApril ?>,<?php echo $stockMay ?>,<?php echo $stockJune ?>,<?php echo $stockJuly ?>,<?php echo $stockAugust ?>,<?php echo $stockSeptember ?>,<?php echo $stockOctober ?>,<?php echo $stockNovember ?>,<?php echo $stockDecember ?>]
}
]
}
window.onload = function(){
var ctx = document.getElementById("canvas1").getContext("2d");
window.myLine = new Chart(ctx).Line(lineChartData, {
responsive: true
});
}
</script>
图二：
<script type="text/javascript">
var lineChartData = {
labels : ["January","February","March","April","May","June","July","August","September","October","November","December"],
datasets : [
{
label: "Target",
fillColor : "rgba(220,220,220,0.2)",
strokeColor : "rgba(220,220,220,1)",
pointColor : "rgba(220,220,220,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(220,220,220,1)",
data : [19000,21000,23000,25000,27000,29000,31000,32000,33000,0,0]
},
{
label: "Sales",
fillColor : "rgba(151,187,205,0.2)",
strokeColor : "rgba(151,187,205,1)",
pointColor : "rgba(151,187,205,1)",
pointStrokeColor : "#fff",
pointHighlightFill : "#fff",
pointHighlightStroke : "rgba(151,187,205,1)",
data : [<?php echo $northJanuary ?>,<?php echo $northFebruary ?>,<?php echo $northMarch ?>,<?php echo $northApril ?>,<?php echo $northMay ?>,<?php echo $northJune ?>,<?php echo $northJuly ?>,<?php echo $northAugust ?>,<?php echo $northSeptember ?>,<?php echo $northOctober ?>,<?php echo $northNovember ?>,<?php echo $northDecember ?>]
}
]
}
window.onload = function(){
var ctx = document.getElementById("canvas2").getContext("2d");
window.myLine = new Chart(ctx).Line(lineChartData, {
responsive: true
});
}
</script>
你的帮助会非常感激，一直困扰我一段时间！
提前致谢
5 个答案:
答案 0 :(得分：10)
尝试为两个ctx变量使用不同的名称。
window.onload = function(){
var ctx = document.getElementById("canvas2").getContext("2d");
window.myLine = new Chart(ctx).Line(lineChartData, {
responsive: true
});
var ctx2 = document.getElementById("canvas1").getContext("2d");
window.myLine = new Chart(ctx2).Line(lineChartData2, {
responsive: true
});
}
答案 1 :(得分：3)
最初我遇到了与原始问题和Tried Arpan Das建议完全相同的问题，但在第一次尝试时没有做到正确。
其他人遇到同样的问题，可能会发现在一个页面上查看多个图表的这个工作示例很有用：
<div id="canvas-holder">
<canvas id="A" width="300" height="300"/><br>
</div>
<div id="canvas-holder">
<canvas id="B" width="300" height="300"/><br>
</div>
<script>
var pieDataA = [ { value: 50, color: "#F6BFBD" } ];
var pieDataB = [ { value: 50, color: "#00BFBD" } ];
window.onload = function(){
var ctx1 = document.getElementById("A").getContext("2d");
window.myPieA = new Chart(ctx1).Pie(pieDataA);
var ctx2 = document.getElementById("B").getContext("2d");
window.myPieB = new Chart(ctx2).Pie(pieDataB); };
</script>
答案 2 :(得分：2)
初始代码中的错误是您多次调用函数 window.onload 。
不幸的是，事情并非如此简单。执行第二个onload事件处理程序时，将替换第一个onload事件处理程序。 [所以一直到最后onload.window]
当您想要单独创建图形时，通常会出现这个问题，例如，在页面图中包含php（因为在每个php页面中，您调用的是window.onload）
简易解决方案：
function start() {
func1();
func2();
}
window.onload = start;
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
if (oldonload) {
oldonload();
}
func();
}
}
}
addLoadEvent(nameOfSomeFunctionToRunOnPageLoad);
addLoadEvent(function() {
/* more code to run on page load */
});
答案 3 :(得分：0)
使用chart.js的多个折线图
<script type="text/javascript">
$(document).ready(function () {
debugger;
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "CampComparison.aspx/getLineChartDataload",
data:{},
async: true,
cache: false,
dataType: "json",
success: OnSuccess_,
error: OnErrorCall_
})
function OnSuccess_(reponse) {
var aData = reponse.d;
var aLabels = aData[0];
var aDatasets1 = aData[1];
var aDatasets2 = aData[2];
var aDatasets3 = aData[3];
var aDatasets4 = aData[4];
var aDatasets5 = aData[5];
var lineChartData = {
labels: aLabels,
datasets: [
{
label: "Data1",
//fill:false,
fillColor: "rgba(0,0,0,0)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(200,122,20,1)",
data: aDatasets1
},
{
label: "Data2",
fillColor: 'rgba(0,0,0,0)',
strokeColor: 'rgba(220,180,0,1)',
pointColor: 'rgba(220,180,0,1)',
data: aDatasets2
},
{
label: "Data5",
fillColor: "rgba(0,0,0,0)",
strokeColor: "rgba(151,187,205,1)",
pointColor: "rgba(152,188,204,1)",
data: aDatasets3
},
{
label: "Data4",
fillColor: 'rgba(0,0,0,0)',
strokeColor: 'rgba(151,187,205,1)',
pointColor: 'rgba(151,187,205,1)',
data: aDatasets4
},
{
label: "Data4",
fillColor: 'rgba(0,0,0,0)',
strokeColor: 'rgba(151,187,205,1)',
pointColor: 'rgba(151,187,205,1)',
data: aDatasets5
},
]
}
Chart.defaults.global.animationSteps = 50;
Chart.defaults.global.tooltipYPadding = 16;
Chart.defaults.global.tooltipCornerRadius = 0;
Chart.defaults.global.tooltipTitleFontStyle = "normal";
Chart.defaults.global.tooltipFillColor = "rgba(0,160,0,0.8)";
Chart.defaults.global.animationEasing = "easeOutBounce";
Chart.defaults.global.responsive = true;
Chart.defaults.global.scaleLineColor = "black";
Chart.defaults.global.scaleFontSize = 16;
//lineChart.destroy();
//document.getElementById("canvas").innerHTML = ' ';
//document.getElementById("chartContainer").innerHTML = ' ';
//document.getElementById("chartContainer").innerHTML = '<canvas id="canvas" style="width: 650px; height: 350px;"></canvas>';
//var ctx = document.getElementById("canvas").getContext("2d");
//ctx.innerHTML = "";
//var pieChartContent = document.getElementById('pieChartContent');
//pieChartContent.innerHTML = ' ';
//$('#pieChartContent').append('<canvas id="canvas" width="650px" height="350px"><canvas>');
//ctx = $("#canvas").get(0).getContext("2d");
var ctx = document.getElementById("canvas").getContext("2d");
var lineChart = new Chart(ctx).Line(lineChartData, {
bezierCurve: true,
chartArea: { width: '62%' },
responsive: true,
pointDotRadius: 10,
scaleShowVerticalLines: false,
scaleGridLineColor: 'black'
});
}
function OnErrorCall_(repo) {
//alert(repo);
}
});
//});
</script>
C#code
--------
[WebMethod(EnableSession = true)]
public static List<object> getLineChartDataload()
{
List<object> iData = new List<object>();
List<string> labels = new List<string>();
string advertiserid = HttpContext.Current.Session["AccountID"].ToString();
if (!string.IsNullOrEmpty(advertiserid))
{
// string StartDate = DateTime.Now.AddDays(-180).ToString("yyyy-MM-dd");
string StartDate = DateTime.Now.AddDays(-60).ToString("yyyy-MM-dd");
string EndDate = DateTime.Now.ToString("yyyy-MM-dd");
string strcampaignid = string.Empty;
DataTable dt = new DataTable();
int i = 0;
chatBL objcampid = new chatBL();
string query = "select distinct top 3 Campaignid,CampaignName from campaign where advertiserid='" + advertiserid + "' order by CampaignName";
dt = objcampid.commonFuntionGetData2(query);
foreach (DataRow drow in dt.Rows)
{
strcampaignid += drow["Campaignid"].ToString() + ",";
}
if (!string.IsNullOrEmpty(strcampaignid))
{
strcampaignid = strcampaignid.Substring(0, strcampaignid.Length - 1);
}
string[] campaignid = strcampaignid.Split(',');
//First get distinct Month Name for select Year.
// string query1 = "select top 10 cast(createddatetime as date) as month_name from advertiser where CurrentBal>0 order by CurrentBal";
//query1 += " ";
// query1 += " order by month_number;";
foreach (string strcamp in campaignid)
{
if (i == 0)
{
chatBL objblabel = new chatBL();
// DataTable dtLabels = objblabel.Topupmonthly("5E8EF1E9-67BF-489C-84CB-AFF0BB0FE707", "2015-09-18", "2016-02-25", "months");
DataTable dtLabels = objblabel.Topupmonthly2(strcamp, StartDate, EndDate, "months");
foreach (DataRow drow in dtLabels.Rows)
{
labels.Add(drow["InsDateTime"].ToString().Substring(2, 7));
}
iData.Add(labels);
}
// string query_DataSet_1 = "select top 10 CurrentBal from advertiser where CurrentBal>0 order by CurrentBal";
//query_DataSet_1 += " (orders_quantity) as total_quantity from mobile_sales ";
//query_DataSet_1 += " where YEAR(orders_date)='" + year + "' and mobile_id='" + mobileId_one + "' ";
//query_DataSet_1 += " group by month(orders_date) ";
//query_DataSet_1 += " order by month_number ";
chatBL objbl = new chatBL();
DataTable dtDataItemsSets_1 = objbl.Topupmonthly2(strcamp, StartDate, EndDate, "months");
List<double> lst_dataItem_1 = new List<double>();
foreach (DataRow dr in dtDataItemsSets_1.Rows)
{
lst_dataItem_1.Add(Convert.ToDouble(dr["CPACOUNT"].ToString()));
}
iData.Add(lst_dataItem_1);
//string query_DataSet_2 = "select top 10 Totalspent from advertiser where CurrentBal>0 order by CurrentBal";
//query_DataSet_2 += " (orders_quantity) as total_quantity from mobile_sales ";
//query_DataSet_2 += " where YEAR(orders_date)='" + year + "' and mobile_id='" + mobileId_two + "' ";
//query_DataSet_2 += " group by month(orders_date) ";
//query_DataSet_2 += " order by month_number ";
//chatBL objbl1 = new chatBL();
//DataTable dtDataItemsSets_2 = objbl1.Topupmonthly("5E8EF1E9-67BF-489C-84CB-AFF0BB0FE707", "2015-09-18", "2016-02-25", "months");
//List<double> lst_dataItem_2 = new List<double>();
//foreach (DataRow dr in dtDataItemsSets_2.Rows)
//{
// lst_dataItem_2.Add(Convert.ToDouble(dr["CPACOUNT"].ToString()));
//}
//iData.Add(lst_dataItem_2);
i = i + 1;
}
}
return iData;
}
答案 4 :(得分：0)
我遇到了同样的问题，尽管我的注意力仍然很小，但我花了一些时间来弄清楚：我对所有图表使用了相同的数据参考，但变化很小。
以下是问题和解决方案：
chartData = {
labels: Array(dataLeft.length).fill(""), // No labels on X axis
datasets: [
{
label : "Lado Esquerdo",
backgroundColor : "rgba(50,192,50,0.4)",
borderColor : "rgba(75,192,75,1)",
pointBorderColor : "rgba(75,192,75,1)",
data : dataLeft,
},
{
label : "Lado Direito",
backgroundColor : "rgba(192,50,50,0.4)",
borderColor : "rgba(192,75,75,1)",
pointBorderColor : "rgba(192,75,75,1)",
data : dataRight,
}
]
};
我在所有图表中使用此chartData，但在构建新图表之前，我正在更改数据属性（chartData.datasets[0].data = some_specific_value_for_each_chart）
但由于这是一个参考，我正在更改所有先前构建的图表的数据，将他们的数据设置为最初图表的相同数据！
我不知道我是否采用了最佳方法，但为了解决这个问题，我在初始化图表时动态地返回了数据
createChartData = function(dataRight, dataLeft) {
return {
labels: Array(dataLeft.length).fill(""), // No labels on X axis
datasets: [
{
label : "Lado Esquerdo",
backgroundColor : "rgba(50,192,50,0.4)",
borderColor : "rgba(75,192,75,1)",
pointBorderColor : "rgba(75,192,75,1)",
data : dataLeft,
},
{
label : "Lado Direito",
backgroundColor : "rgba(192,50,50,0.4)",
borderColor : "rgba(192,75,75,1)",
pointBorderColor : "rgba(192,75,75,1)",
data : dataRight,
}
]
}
};
然后初始化图表：
var chart1 = new Chart(ctx1, {
type: 'line',
data: createChartData(graphData1, graphData2),
options: chartOptions
});
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