canvasJS 图表无法正确呈现

Question

我正在尝试使用 canvasJS render 多折线图，但它没有按预期工作。

这是我的 drawChart 函数

function drawChart(obj, placeholder){
var dataPoints = [];
var maxPrice = [];
var minPrice = [];
//console.info(obj);
for (var i = obj.length - 1; i >= 0; i--) {
    dataPoints.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:Math.round(obj[i].avgPrice * 1000) / 1000});
    minPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:obj[i].minPrice});
    maxPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:obj[i].maxPrice});
}
console.log(dataPoints);
console.log(maxPrice);
console.log(minPrice);
var chart = new CanvasJS.Chart("chartContainer",
{
    animationEnabled: true,
    //theme: "theme1",
    zoomEnabled: true,
    title:{
        text: placeholder
    },
    data: [
        {
            type: "spline",  //change type to bar, line, area, pie, etc
            showInLegend: true,
            legendText: "Average Price", 
            dataPoints: dataPoints    //this line I tried to change
        },
        {
            type: "spline",  
            showInLegend: true,
            legendText: "Min Price", 
            dataPoints: minPrice
        },
        {
            type: "spline",  
            showInLegend: true,
            legendText: "Max Price", 
            dataPoints: maxPrice
        }
    ],
    legend: {
        cursor: "pointer",
        itemclick: function (e) {
            if (typeof(e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
                e.dataSeries.visible = false;
            } else {
                e.dataSeries.visible = true;
        }
        chart.render();
        }
    }
});

chart.render();

}

var dataPoints, maxPrice, minPrice 具有相同的 layout/data.

看这里

它显示的图表是这样的，两条线的重置minPrice and maxPrice消失了。

PS 如果我将 dataPoints: dataPoints 更改为 dataPoints: min/maxPrice 它也不起作用。

Answer 1

我找到了解决方案，我将其发布，希望对其他人有所帮助。

我怀疑如果您尝试动态呈现图表，那么对于 y-axis 您需要使用 Math 函数来使其工作。

所以我改变了这些

dataPoints.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:Math.round(obj[i].avgPrice * 1000) / 1000});
minPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:obj[i].minPrice});
maxPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:obj[i].maxPrice});

到

dataPoints.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:Math.round(obj[i].avgPrice * 1000) / 1000});
minPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:Math.round(obj[i].minPrice * 1000) / 1000});
maxPrice.push({label:obj[i].year+"-"+obj[i].month+"-"+obj[i].day,y:Math.round(obj[i].maxPrice * 1000) / 1000});

现在它工作正常，这可能是 canvasjs 中的一个错误，或者可能是我在某个地方搞砸了。

看这里

canvasJS 图表无法正确呈现

canvasJS chart not rendering properly

javascript

jquery

charts

canvasjs