将最后一个值添加到 AmCharts 图形中的图例中

Question

有没有办法在不将鼠标悬停在 AmCharts 图表上时将图表中的最后一个值添加到图例名称中？

这是一个带有演示图表的代码笔。https://codepen.io/anon/pen/LxmLaL

这是 js 代码

    var chartData = generateChartData();
var chart = AmCharts.makeChart("chartdiv", {
    "type": "serial",
    "theme": "light",
    "legend": {
         "periodValueText":"last"
    },
    "dataProvider": chartData,
    "synchronizeGrid":true,
    "valueAxes": [{
        "id":"v1",
        "axisColor": "#FF6600",
        "axisThickness": 2,
        "axisAlpha": 1,
        "position": "left"
    }, {
        "id":"v2",
        "axisColor": "#FCD202",
        "axisThickness": 2,
        "axisAlpha": 1,
        "position": "right"
    }, {
        "id":"v3",
        "axisColor": "#B0DE09",
        "axisThickness": 2,
        "gridAlpha": 0,
        "offset": 50,
        "axisAlpha": 1,
        "position": "left"
    }],
    "graphs": [{
        "valueAxis": "v1",
        "lineColor": "#FF6600",
        "bullet": "round",
        "bulletBorderThickness": 1,
        "hideBulletsCount": 30,
        "title": "red line",
        "valueField": "visits",
        "fillAlphas": 0
    }, {
        "valueAxis": "v2",
        "lineColor": "#FCD202",
        "bullet": "square",
        "bulletBorderThickness": 1,
        "hideBulletsCount": 30,
        "title": "yellow line",
        "valueField": "hits",
        "fillAlphas": 0
    }, {
        "valueAxis": "v3",
        "lineColor": "#B0DE09",
        "bullet": "triangleUp",
        "bulletBorderThickness": 1,
        "hideBulletsCount": 30,
        "title": "green line",
        "valueField": "views",
        "fillAlphas": 0
    }],
    "chartScrollbar": {},
    "chartCursor": {
        "cursorPosition": "mouse"
    },
    "categoryField": "date",
    "categoryAxis": {
        "parseDates": true,
        "axisColor": "#DADADA",
        "minorGridEnabled": true
    }
});
chart.addListener("dataUpdated", zoomChart);
zoomChart();

// generate some random data, quite different range
function generateChartData() {
    var chartData = [];
    var firstDate = new Date();
    firstDate.setDate(firstDate.getDate() - 100);
    for (var i = 0; i < 100; i++) {
        // we create date objects here. In your data, you can have date strings
        // and then set format of your dates using chart.dataDateFormat property,
        // however when possible, use date objects, as this will speed up chart rendering.
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + i);
        var visits = Math.round(Math.sin(i * 5) * i);
        var hits = Math.round(Math.random() * 80) + 500 + i * 3;
        var views = Math.round(Math.random() * 6000) + i * 4;
        chartData.push({
            date: newDate,
            visits: visits,
            hits: hits,
            views: views
        });
    }
    return chartData;
}
function zoomChart(){
    chart.zoomToIndexes(chart.dataProvider.length - 20, chart.dataProvider.length - 1);
}

我相信它与periodValueText有关，但我无法弄清楚如何实现相同的目标。任何帮助将不胜感激。

Answer 1

您已经正确地指出需要使用periodValueText。您只需要在其中使用双括号元代码即可。对于接近值，它[[value.close]]：

"legend": {
  "periodValueText":"[[value.close]]"
}