缩小删除日期，但保留时间

时间：2019-04-26 11:40:29

标签： javascript charts amcharts amcharts4

当我放大图表时，可以看到类似26 Apr, 9:05的日期，但是当我缩小图表时，只能看到类似9:00的时间。如何始终显示日期？这是我的图表（https://codepen.io/anon/pen/GLPPGq）：

am4core.useTheme(am4themes_animated);
var chart = am4core.create("chartdiv", am4charts.XYChart);

chart.dataSource.url = "https://api.myjson.com/bins/i3np8";

chart.dataSource.events.on("parseended", function(ev) {
    var data = ev.target.data;
    data.sort(function(lhs, rhs) {
        return lhs.time - rhs.time;
    });
    data.forEach(function(item) {
        item.time *= 1000;
    });
});

chart.numberFormatter.numberFormat = "#.0b";

chart.dateFormatter.inputDateFormat = "x";
var dateAxis = chart.xAxes.push(new am4charts.DateAxis());

dateAxis.dateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.startLocation = 0.5;
dateAxis.endLocation = 0.5;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;

var series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "time";
series.name = "Traffic out";
series.dataFields.valueY = "outDiffFormatted";
series.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series.tooltipText = "[#000]{valueY.value}[/]";
series.tooltip.background.fill = am4core.color("#FFF");
series.tooltip.getStrokeFromObject = true;
series.tooltip.background.strokeWidth = 3;
series.tooltip.getFillFromObject = false;
series.fillOpacity = 0.6;
series.strokeWidth = 2;
series.stacked = false;

var series2 = chart.series.push(new am4charts.LineSeries());
series2.dataFields.dateX = "time";
series2.name = "Traffic in";
series2.dataFields.valueY = "inDiffFormatted";
series2.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series2.tooltipText = "[#000]{valueY.value}[/]";
series2.tooltip.background.fill = am4core.color("#FFF");
series2.tooltip.getFillFromObject = false;
series2.tooltip.getStrokeFromObject = true;
series2.tooltip.background.strokeWidth = 3;
series2.sequencedInterpolation = true;
series2.fillOpacity = 0.5;
series2.stacked = false;
series2.strokeWidth = 2;

chart.cursor = new am4charts.XYCursor();
chart.cursor.lineY.opacity = 0;
chart.cursor.xAxis = dateAxis;
chart.scrollbarX = new am4charts.XYChartScrollbar();
chart.scrollbarX.series.push(series);

chart.legend = new am4charts.Legend();
chart.legend.position = "top";
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
    width: 100%;
    height: 500px;
}
    <!DOCTYPE html>
    <html>
        <head>
        <style>

        </style>
        </head>
        <body>
            <script src="https://www.amcharts.com/lib/4/core.js"></script>
            <script src="https://www.amcharts.com/lib/4/charts.js"></script>
            <script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>
            <div id="chartdiv"></div>
        </body>
    </html>

1 个答案:

答案 0 :(得分：2)

缩放的时间变化是由于AmCharts处理时段的方式所致-当可见数据的时间跨度达到阈值时，图表会将格式升级或降级为其他时段的日期格式，以确保这些点更加可见。您可以按照dateAxis'formatting date and time documentation中所述修改periodChangeDateFormats和dateFormats中的格式来更改此设置，如下所示：

dateAxis.dateFormats.setKey("hour", "d MMM,\nHH:mm");
dateAxis.periodChangeDateFormats.setKey("hour", "d MMM,\nHH:mm");

根据数据集的大小，您需要在baseInterval之上和/或之下的多个时间段内进行设置，以确保在各种缩放级别下都能获得理想的输出。根据您的情况，除了"hour"之外，还向"minute"键添加一种格式。

am4core.useTheme(am4themes_animated);
var chart = am4core.create("chartdiv", am4charts.XYChart);

chart.dataSource.url = "https://api.myjson.com/bins/i3np8";

chart.dataSource.events.on("parseended", function(ev) {
    var data = ev.target.data;
    data.sort(function(lhs, rhs) {
        return lhs.time - rhs.time;
    });
    data.forEach(function(item) {
        item.time *= 1000;
    });
});

chart.numberFormatter.numberFormat = "#.0b";

chart.dateFormatter.inputDateFormat = "x";
var dateAxis = chart.xAxes.push(new am4charts.DateAxis());

dateAxis.dateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.dateFormats.setKey("hour", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("hour", "d MMM, \nHH:mm");
dateAxis.startLocation = 0.5;
dateAxis.endLocation = 0.5;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;

var series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "time";
series.name = "Traffic out";
series.dataFields.valueY = "outDiffFormatted";
series.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series.tooltipText = "[#000]{valueY.value}[/]";
series.tooltip.background.fill = am4core.color("#FFF");
series.tooltip.getStrokeFromObject = true;
series.tooltip.background.strokeWidth = 3;
series.tooltip.getFillFromObject = false;
series.fillOpacity = 0.6;
series.strokeWidth = 2;
series.stacked = false;

var series2 = chart.series.push(new am4charts.LineSeries());
series2.dataFields.dateX = "time";
series2.name = "Traffic in";
series2.dataFields.valueY = "inDiffFormatted";
series2.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series2.tooltipText = "[#000]{valueY.value}[/]";
series2.tooltip.background.fill = am4core.color("#FFF");
series2.tooltip.getFillFromObject = false;
series2.tooltip.getStrokeFromObject = true;
series2.tooltip.background.strokeWidth = 3;
series2.sequencedInterpolation = true;
series2.fillOpacity = 0.5;
series2.stacked = false;
series2.strokeWidth = 2;

chart.cursor = new am4charts.XYCursor();
chart.cursor.lineY.opacity = 0;
chart.cursor.xAxis = dateAxis;
chart.scrollbarX = new am4charts.XYChartScrollbar();
chart.scrollbarX.series.push(series);

chart.legend = new am4charts.Legend();
chart.legend.position = "top";
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
    width: 100%;
    height: 500px;
}
<!DOCTYPE html>
    <html>
        <head>
        <style>

        </style>
        </head>
        <body>
            <script src="https://www.amcharts.com/lib/4/core.js"></script>
            <script src="https://www.amcharts.com/lib/4/charts.js"></script>
            <script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>
            <div id="chartdiv"></div>
        </body>
    </html>

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