最近需要用Jqplot做双Y轴的Chart图，首先我找到了文档上的例子并对数据做了一些调整：
1.例子展示:
var s1 = [["2002-01-01", 112000], ["2003-01-01", 122000], ["2004-01-01", 104000], ["2005-01-01", 99000], ["2006-01-01", 121000], ["2007-01-01", 148000], ["2008-01-01", 114000], ["2009-01-01", 133000], ["2010-01-01", 161000]]; var s2 = [["2002-01-01", 10200], ["2003-01-01", 10800], ["2004-01-01", 11200], ["2005-01-01", 11800], ["2006-01-01", 12400], ["2007-01-01", 12800], ["2008-01-01", 13200], ["2009-01-01", 12600], ["2010-01-01", 13100]]; plot1 = $.jqplot("systolicChart2", [s2, s1], { animate: true, animateReplot: true, cursor: { show: true, zoom: true, looseZoom: true, showTooltip: false }, series:[ { pointLabels: { show: true }, showHighlight: false, yaxis: 'y2axis', rendererOptions: { animation: { speed: 2500 }, barWidth: 15, barPadding: -15, barMargin: 0, highlightMouseOver: false } }, { rendererOptions: { animation: { speed: 2000 } } } ], axesDefaults: { pad: 0, tickOptions: { angle: -30 }, }, axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer, }, yaxis: { tickOptions: { formatString: "$%'d" }, rendererOptions: { forceTickAt0: true } }, y2axis: { tickOptions: { formatString: "$%'d" }, rendererOptions: { alignTicks: true, forceTickAt0: true } } }, highlighter: { show: true, showLabel: true, tooltipAxes: 'y', sizeAdjust: 7.5 , tooltipLocation : 'ne' } });
显示效果展示：
2. 由于需要从数据库中读取数据并且X轴需要显示为日期格式，所以我将从数据库中获取的数据的日期格式转为"yyyy-MM-dd":
另外，由于需要对数据进行重新组织，可能会用到JS中的Push()方法，在定义对象并调用Push()方法时，无论对象定义为new Array()或[]，对结果均无任何影响。
function getPointList(pList) { var DataLists = [];//无论此处定义为new Array()或[]，均对显示效果无影响。 for (var x in pList) { DataLists.push([pList[x].PointShowDate, pList[x].PointValue]); } return DataLists; }
完成数据组织并时调用呈现代码时，总是无法显示Chart，相关代码如下：
$.jqplot(ChartId, [LineList, LineListBG], { animate: true, animateReplot: true, seriesColors: ColorList, title: { text: v_Title, textAlign: 'left' }, seriesDefaults: { show: true, lineWidth: 1, pointLabels: { show: false, formatString: "%.0f", location: "s", ypadding: 1, }, markerOptions: { show: true, lineWidth: 1, size: 12 } }, series: [{ yaxis: 'y2axis' }], axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer, show: true, ticks: X_Ticks, tickOptions: { formatString: '%d %b %n %Y %n %a', show: true, showGridline: false, showMark: false }, showTicks: true, useSeriesColor: true, rendererOptions: { drawBaseline: false } }, yaxis: { show: true, ticks: Y_Ticks, tickOptions: { formatString: '%.0f', mark: 'inside', show: true, showMark: false, showGridLine: false, showLabel: true, }, label: 'Blood Pressure', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, useSeriesColor: true, showTickMarks: true, rendererOptions: { drawBaseline: false } }, y2axis: { show: true, ticks: Y_BGTicks, tickOptions: { formatString: '%.0f', mark: 'inside', show: true, showMark: true, showGridLine: false, showLabel: true, }, label: 'Glucose', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, useSeriesColor: true, showTickMarks: true, rendererOptions: { drawBaseline: false } } }, highlighter: { show: true, sizeAdjust: 4, tooltipContentEditor: tooltipContentEditor, tooltipLocation: 'n', }, cursor: { show: false }, grid: { background: '#FFFFFF', gridLineColor: '#cccccc', shadow: false, drawBorder: false, borderColor: '#FFFFFF', borderWidth: 2, }, legend: { show: false, location: 'ne', background: '#FFFFFF', placement: "insideGrid", fontSize: 5 } });
3. 修改第一步的代码，我怀疑是定义对象并调用Push()方法时，对象定义为new Array()或[]时引起了异常：
于是修改第一步的代码为如下：
$(document).ready(function () { var s1 = new Array(); var s2 = new Array(); s1.push(["2002-01-01", 112000]); s1.push(["2003-01-01", 122000]); s1.push(["2004-01-01", 104000]); s1.push(["2005-01-01", 99000]); s1.push(["2006-01-01", 121000]); s1.push(["2007-01-01", 148000]); s1.push(["2008-01-01", 114000]); s1.push(["2009-01-01", 133000]); s1.push(["2010-01-01", 161000]); s2.push(["2002-01-01", 10200]); s2.push(["2003-01-01", 10800]); s2.push(["2004-01-01", 11200]); s2.push(["2005-01-01", 11800]); s2.push(["2006-01-01", 12400]); s2.push(["2007-01-01", 12800]); s2.push(["2008-01-01", 13200]); s2.push(["2009-01-01", 12600]); s2.push(["2010-01-01", 13100]); $.jqplot("systolicChart2", [s2, s1], { animate: true, animateReplot: true, cursor: { show: true, zoom: true, looseZoom: true, showTooltip: false }, series:[ { pointLabels: { show: true }, showHighlight: false, yaxis: 'y2axis', rendererOptions: { animation: { speed: 2500 }, barWidth: 15, barPadding: -15, barMargin: 0, highlightMouseOver: false } }, { rendererOptions: { animation: { speed: 2000 } } } ], axesDefaults: { pad: 0, tickOptions: { angle: -30 }, }, axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer, }, yaxis: { tickOptions: { formatString: "$%'d" }, rendererOptions: { forceTickAt0: true } }, y2axis: { tickOptions: { formatString: "$%'d" }, rendererOptions: { alignTicks: true, forceTickAt0: true } } }, highlighter: { show: true, showLabel: true, tooltipAxes: 'y', sizeAdjust: 7.5 , tooltipLocation : 'ne' } }); });
结果可以正常显示，如下图所示：
然后修改第二步的代码为如下：
$(document).ready(function () { var s3 = []; var s4 = []; s3.push(["2016-04-28",105]); s3.push(["2016-04-29",90]); s3.push(["2016-05-18",80]); s3.push(["2016-05-18",80]); s4.push(["2016-05-04",17]); s4.push(["2016-05-08",8]); s4.push(["2016-05-12",6]); s4.push(["2016-05-16", 4]); $.jqplot(ChartId, [s3, s4], { animate: true, animateReplot: true, title: { text: v_Title, textAlign: 'left' }, seriesDefaults: { show: true, lineWidth: 1, pointLabels: { show: false, formatString: "%.0f", location: "s", ypadding: 1, }, markerOptions: { show: true, lineWidth: 1, size: 12 } }, series: [{ yaxis: 'y2axis' }], axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer, }, yaxis: { label: 'Blood Pressure', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, }, y2axis: { label: 'Glucose', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, } }, highlighter: { show: true, sizeAdjust: 4, tooltipContentEditor: tooltipContentEditor, tooltipLocation: 'n', }, cursor: { show: false }, grid: { background: '#FFFFFF', gridLineColor: '#cccccc', shadow: false, drawBorder: false, borderColor: '#FFFFFF', borderWidth: 2, }, legend: { show: false, location: 'ne', background: '#FFFFFF', placement: "insideGrid", fontSize: 5 } }); });
结果可以正常显示：
4. 启用Google Chrome的调试：
跟踪第二步无法正常显示的代码：
跟踪第三步可以正常显示的代码：
错误显而易见；
5. 修改代码并显示正确结果：
$(document).ready(function () { $.jqplot(ChartId, [LineListBG[0][0], LineList[0][0]], { animate: true, animateReplot: true, //seriesColors: ColorList, title: { text: v_Title, textAlign: 'left' }, seriesDefaults: { show: true, lineWidth: 1, pointLabels: { show: false, formatString: "%.0f", location: "s", ypadding: 1, }, markerOptions: { show: true, lineWidth: 1, size: 12 } }, series: [{ yaxis: 'y2axis' }], axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer, show: true, ticks: X_Ticks, tickOptions: { formatString: '%d %b %n %Y %n %a', show: true, showGridline: false, showMark: false }, showTicks: true, //useSeriesColor: true, rendererOptions: { drawBaseline: false } }, yaxis: { show: true, ticks: Y_Ticks, tickOptions: { formatString: '%.0f', mark: 'inside', show: true, showMark: false, showGridLine: false, showLabel: true, }, label: 'Blood Pressure', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, //useSeriesColor: true, showTickMarks: true, rendererOptions: { drawBaseline: false } }, y2axis: { show: true, ticks: Y_BGTicks, tickOptions: { formatString: '%.0f', mark: 'inside', show: true, showMark: true, showGridLine: false, showLabel: true, }, label: 'Glucose', labelRenderer: $.jqplot.CanvasAxisLabelRenderer, //useSeriesColor: true, showTickMarks: true, rendererOptions: { drawBaseline: false } } }, highlighter: { show: true, sizeAdjust: 4, tooltipContentEditor: tooltipContentEditor, tooltipLocation: 'n', }, cursor: { show: false }, grid: { background: '#FFFFFF', gridLineColor: '#cccccc', shadow: false, drawBorder: false, borderColor: '#FFFFFF', borderWidth: 2, }, legend: { show: false, location: 'ne', background: '#FFFFFF', placement: "insideGrid", fontSize: 5 } }); });
最终结果显示：
6. 总结：
在只有一个X/Y轴时，X轴的英文日期格式可以被正确识别，即在传入数据时可以直接写对象名称而不用加"[]":如下所示：
$(document).ready(function () { $.jqplot(ChartId, LineList, {}）
补充(Supplement): The parameters of property tooltipContentEditor(str, seriesIndex, pointIndex, plot)(tooltipContentEditor参数用法):
str:The value of current point;
seriesIndex:The thread number,if there are 2 threads in current chart and you move the cursor to the second thread,the value will be 2;
pointIndex:The order number of the point,such as 1,2,3,4... ...
plot:Can includes all of and all kinds of the value you want display when you move the cursor to any point,you can get what you want from this parameter!
7. 感谢
最后衷心感谢Google Chrome浏览器强大的调试功能！！！