问题
Could someone help me on changing the bullet or highlighting the highest and lowest values using amcharts?.
I am using serial chart. The condition given in the function "highlight" is matching , however the the bullets are not highlighted to the highest and lowest points..
Any help will be appreciated.
Please find my code below.
<link rel="stylesheet" href="style.css" type="text/css">
<script src="amcharts/amcharts.js" type="text/javascript"></script>
<script src="amcharts/serial.js" type="text/javascript"></script>
<script>
var chart;
var chartData = [
{"date": "2006", "value": 63, "value1": 87},
{"date": "2007", "value": 64, "value1": 63},
{"date": "2008", "value": 66, "value1": 75},
{"date": "2009", "value": 70, "value1": 51},
{"date": "2010", "value": 63, "value1": 79},
{"date": "2011", "value": 64, "value1": 65},
{"date": "2012", "value": 56, "value1": 52},
{"date": "2013", "value": 60, "value1": 88},
{"date": "2014", "value": 56, "value1": 90},
{"date": "2015", "value": 68, "value1": 83},
{"date": "2016", "value": 68, "value1": 63},
{"date": "2017", "value": 69, "value1": 74},
{"date": "2018", "value": 70, "value1": 68},
{"date": "2019", "value": 55, "value1": 65}, ];
AmCharts.ready(function () {
// SERIAL CHART
chart = new AmCharts.AmSerialChart();
chart.dataProvider = chartData;
chart.dataDateFormat = "YYYY";
chart.categoryField = "date";
chart.addTitle("Graph Chart-Connects/ Disconnects");
chart.addListener("rendered", highlight);
// AXES
// category
var categoryAxis = chart.categoryAxis;
categoryAxis.parseDates = true; // as our data is date-based, we set parseDates to true
categoryAxis.minPeriod = "YYYY"; // our data is daily, so we set minPeriod to DD
categoryAxis.gridAlpha = 0.1;
categoryAxis.minorGridAlpha = 0.1;
categoryAxis.axisAlpha = 0;
categoryAxis.minorGridEnabled = true;
categoryAxis.inside = true;
// value
var valueAxis = new AmCharts.ValueAxis();
valueAxis.tickLength = 0;
valueAxis.axisAlpha = 0;
valueAxis.showFirstLabel = false;
valueAxis.showLastLabel = false;
chart.addValueAxis(valueAxis);
// GRAPH
var graph = new AmCharts.AmGraph();
graph.title = "Connects";
graph.dashLength = 3;
graph.lineColor = "#00CC00";
graph.valueField = "value";
graph.bullet = "round";
graph.balloonText = "[[category]]<br><b><span style='font-size:14px;'>Connects:[[value]]</span></b>";
chart.addGraph(graph);
// GRAPH
var graph1 = new AmCharts.AmGraph();
graph1.title = "Disconnects";
graph1.dashLength = 3;
graph1.lineColor = "#EF9B0F";
graph1.valueField = "value1";
graph1.bullet = "square";
graph1.balloonText = "[[category]]<br><b><span style='font-size:14px;'>Disconnects:[[value1]]</span></b>";
graph1.fillToGraph = graph;
chart.addGraph(graph1);
// CURSOR
var chartCursor = new AmCharts.ChartCursor();
chartCursor.valueLineEnabled = true;
chartCursor.valueLineBalloonEnabled = true;
chart.addChartCursor(chartCursor);
// SCROLLBAR
var chartScrollbar = new AmCharts.ChartScrollbar();
chart.addChartScrollbar(chartScrollbar);
// HORIZONTAL GREEN RANGE
var guide = new AmCharts.Guide();
guide.value = 10;
guide.toValue = 20;
guide.fillColor = "#00CC00";
guide.inside = true;
guide.fillAlpha = 0.2;
guide.lineAlpha = 0;
valueAxis.addGuide(guide);
var legend = new AmCharts.AmLegend();
legend.marginLeft = 110;
// legend.data = [{markerType:"round",title:"Connects",color:"#EF9B0F"}, {markerType:"square",title:"Disconnects",color:"#00CC00"}]
chart.addLegend(legend);
// WRITE
chart.write("chartdiv");
});
function highlight(event) {
// get chart and value axis
var chart = event.chart;
var axis = chart.valueAxes[0];
var graph = chart.graphs[1];
if (chart.minMaxMarked)
return;
// find data points with highest and biggest values
for (var i = 0; i < chart.dataProvider.length; i++) {
var dp = chart.dataProvider[i];
console.log(dp[graph.valueField] + "<=>" + axis.maxReal);
//alert(axis.minReal);
if (dp[graph.valueField] == axis.maxReal) {
alert('test');
dp.markerType = "bubble";
dp.bulletSize = 8;
//dp.
}
else if (dp[graph.valueField] == axis.minReal) {
// alert('test');
dp.markerType = "bubble";
dp.bulletSize = 8;
}
}
// set flag that we're done already
chart.minMaxMarked = true;
// take in updated data
chart.validateData();
}
</script>
回答1:
You are correctly setting the size/type parameters for high/low data points in data.
However, your graphs are not set up to use those fields.
To make the graph look for bullet type in data use its bulletField property. For bullet size: bulletSizeField:
graph.bulletSizeField = "bulletSize";
graph.bulletField = "markerType";
// ...
graph1.bulletSizeField = "bulletSize";
graph1.bulletField = "markerType";
回答2:
Solution posted martynasm !!! Thanks.
var chart;
var chartData = [
{"date": "2006", "value": 67, "value1": 83},
{"date": "2007", "value": 70, "value1": 90},
{"date": "2008", "value": 66, "value1": 56},
{"date": "2009", "value": 65, "value1": 50},
{"date": "2010", "value": 55, "value1": 90},
{"date": "2011", "value": 60, "value1": 89},
{"date": "2012", "value": 60, "value1": 52},
{"date": "2013", "value": 61, "value1": 63},
{"date": "2014", "value": 65, "value1": 74},
{"date": "2015", "value": 64, "value1": 53},
{"date": "2016", "value": 66, "value1": 61},
{"date": "2017", "value": 60, "value1": 76},
{"date": "2018", "value": 62, "value1": 65},
{"date": "2019", "value": 61, "value1": 51},
];
AmCharts.ready(function () {
// SERIAL CHART
chart = new AmCharts.AmSerialChart();
chart.dataProvider = chartData;
chart.dataDateFormat = "YYYY";
chart.categoryField = "date";
chart.addTitle("Graph Chart-Connects/ Disconnects");
chart.addListener("rendered", highlightY1);
chart.addListener("rendered", highlightY2);
// AXES
// category
var categoryAxis = chart.categoryAxis;
categoryAxis.parseDates = true; // as our data is date-based, we set parseDates to true
categoryAxis.minPeriod = "YYYY"; // our data is daily, so we set minPeriod to DD
categoryAxis.gridAlpha = 0.1;
categoryAxis.minorGridAlpha = 0.1;
categoryAxis.axisAlpha = 0;
categoryAxis.minorGridEnabled = true;
categoryAxis.inside = true;
// value
var valueAxis = new AmCharts.ValueAxis();
valueAxis.tickLength = 0;
valueAxis.axisAlpha = 0;
valueAxis.showFirstLabel = false;
valueAxis.showLastLabel = false;
chart.addValueAxis(valueAxis);
// GRAPH
var graph = new AmCharts.AmGraph();
graph.title = "Connects";
graph.dashLength = 3;
graph.lineColor = "#00CC00";
graph.valueField = "value";
graph.bullet = "round";
//graph.bulletSizeField = "30";
// graph.bulletField = "value";
graph.balloonText = "[[category]]<br><b><span style='font-size:14px;'>Connects:[[value]]</span></b>";
chart.addGraph(graph);
// GRAPH
var graph1 = new AmCharts.AmGraph();
graph1.title = "Disconnects";
graph1.dashLength = 3;
graph1.lineColor = "#EF9B0F";
graph1.valueField = "value1";
graph1.bullet = "square";
//graph1.bulletSizeField = "30";
// graph1.bulletField = "bullet";
graph1.balloonText = "[[category]]<br><b><span style='font-size:14px;'>Disconnects:[[value1]]</span></b>";
graph1.fillToGraph = graph;
chart.addGraph(graph1);
// CURSOR
var chartCursor = new AmCharts.ChartCursor();
chartCursor.valueLineEnabled = true;
chartCursor.valueLineBalloonEnabled = true;
chart.addChartCursor(chartCursor);
// SCROLLBAR
var chartScrollbar = new AmCharts.ChartScrollbar();
chart.addChartScrollbar(chartScrollbar);
// HORIZONTAL GREEN RANGE
var guide = new AmCharts.Guide();
guide.value = 10;
guide.toValue = 20;
guide.fillColor = "#00CC00";
guide.inside = true;
guide.fillAlpha = 0.2;
guide.lineAlpha = 0;
valueAxis.addGuide(guide);
var legend = new AmCharts.AmLegend();
legend.marginLeft = 110;
// legend.data = [{markerType:"round",title:"Connects",color:"#EF9B0F"}, {markerType:"square",title:"Disconnects",color:"#00CC00"}]
chart.addLegend(legend);
// WRITE
chart.write("chartdiv");
});
function highlightY1(event) {
// get chart and value axis
var chart = event.chart;
// var axis = chart.valueAxes[0];
var graph = chart.graphs[0];
graph.bulletSizeField = "bulletSize1";
graph.bulletField = "markerType1";
if (chart.minMaxMarked)
return;
var connectsValue = new Array();
for (var i = 0; i < chart.dataProvider.length; i++) {
connectsValue[i] = chart.dataProvider[i][graph.valueField];
}
connectsValue.sort();
// find data points with highest and biggest values
connectsMax = parseInt(connectsValue[connectsValue.length - 1]);
connectsMin = parseInt(connectsValue[0]);
for (var i = 0; i < chart.dataProvider.length; i++) {
var dp = chart.dataProvider[i];
if (dp[graph.valueField] == connectsMax) {
console.log(dp[graph.valueField] + "<=>" + connectsMax);
dp.markerType1 = "triangleUp";
dp.bulletSize1 = 18;
}
if (dp[graph.valueField] == connectsMin) {
// alert('test');
console.log(dp[graph.valueField] + "<=>" + connectsMin);
dp.markerType1 = "triangleDown";
dp.bulletSize1 = 18;
}
}
// set flag that we're done already
//chart.minMaxMarked = true;
// take in updated data
// chart.validateData();
}
function highlightY2(event) {
// get chart and value axis
var chart = event.chart;
// var axis = chart.valueAxes[0];
var graph1 = chart.graphs[1];
graph1.bulletSizeField = "bulletSize2";
graph1.bulletField = "markerType2";
if (chart.minMaxMarked)
return;
var disconnectsValue = new Array();
for (var i = 0; i < chart.dataProvider.length; i++) {
disconnectsValue[i] = chart.dataProvider[i][graph1.valueField];
}
disconnectsValue.sort();
// find data points with highest and biggest values
disconnectsMax = parseInt(disconnectsValue[disconnectsValue.length - 1]);
disconnectsMin = parseInt(disconnectsValue[0]);
for (var i = 0; i < chart.dataProvider.length; i++) {
var dp = chart.dataProvider[i];
if (dp[graph1.valueField] == disconnectsMax) {
console.log(dp[graph1.valueField] + "<=>" + disconnectsMax);
dp.markerType2 = "triangleUp";
dp.bulletSize2 = 18;
}
if (dp[graph1.valueField] == disconnectsMin) {
// alert('test');
console.log(dp[graph1.valueField] + "<=>" + disconnectsMin);
dp.markerType2 = "triangleDown";
dp.bulletSize2 = 18;
}
}
// set flag that we're done already
chart.minMaxMarked = true;
// take in updated data
chart.validateData();
}html, body {
width: 100%;
height: 100%;
margin: 0px;
}
#chartdiv {
width: 100%;
height: 100%;
}<script src="//www.amcharts.com/lib/3/amcharts.js"></script>
<script src="//www.amcharts.com/lib/3/serial.js"></script>
<script src="//www.amcharts.com/lib/3/themes/light.js"></script>
<div id="chartdiv"></div>来源：https://stackoverflow.com/questions/36196712/amcharts-issue-while-highlighting-min-and-max-value