Develop Reference

echart data point gradient color

I am trying to make a gradient line chart, The issue is with tooltip legend color and color of data points, they appear in brown gradient which was the default.
I was able to change the tooltip color, anyhow that is not the actual data point color but able to fix it to one color at least. whereas the points on the line do not pick up the color of the line.
Can someone point me in right direction?
var dom = document.getElementById("container");
var myChart = echarts.init(dom);
var app = {};
var option;
var data = [["2020-06-05",116],["2020-06-06",129],["2020-06-07",135],["2020-06-08",86],["2020-06-09",73],["2020-06-10",85],["2020-06-11",73],["2020-06-12",68],["2020-06-13",92],["2020-06-14",130],["2020-06-15",245],["2020-06-16",139],["2020-06-17",115],["2020-06-18",111],["2020-06-19",309],["2020-06-20",206],["2020-06-21",137],["2020-06-22",128],["2020-06-23",85],["2020-06-24",94],["2020-06-25",71],["2020-06-26",106],["2020-06-27",84],["2020-06-28",93],["2020-06-29",85],["2020-06-30",73],["2020-07-01",83],["2020-07-02",125],["2020-07-03",107],["2020-07-04",82],["2020-07-05",44],["2020-07-06",72],["2020-07-07",106],["2020-07-08",107],["2020-07-09",66],["2020-07-10",91],["2020-07-11",92],["2020-07-12",113],["2020-07-13",107],["2020-07-14",131],["2020-07-15",111],["2020-07-16",64],["2020-07-17",69],["2020-07-18",88],["2020-07-19",77],["2020-07-20",83],["2020-07-21",111],["2020-07-22",57],["2020-07-23",55],["2020-07-24",60]];
var dateList = data.map(function (item) {
return item[0];
});
var valueList = data.map(function (item) {
return item[1];
});
option = {
color: {
type: 'linear',
x: 0, y: 1,x2:0,y2:0,
colorStops: [{
offset: 0, color: '#00d4ff' // color at 0% position
}, {
offset: 1, color: '#090979' // color at 100% position
}],
global:true
},
// Make gradient line here
visualMap: [{
show: true,
type: 'continuous',
seriesIndex: 0,
min: 0,
max: 400
}],
title: [{
left: 'center',
text: 'Gradient along the y axis'
}],
xAxis: [{
data: dateList,
axisPointer: {
label:{
color:['#5470c6'],
}
},
axisLabel: {
formatter: function (value) {
return moment(value).format("MMM YY");
// And other formatter tool (e.g. moment) can be used here.
}
}
}],
yAxis: [{
type: 'value',
axisPointer: {
label:{
color:['#5470c6'],
}
}
}],
grid: [{
width:'auto',
height:'auto'
}],
tooltip : {
trigger: 'axis',
axisPointer: {
animation: true,
},
formatter: function (params) {
var colorSpan = color => '<span style="display:inline-block;margin-right:5px;border-radius:10px;width:9px;height:9px;background-color:' + color + '"></span>';
let rez = '<p>' + params[0].axisValue + '</p>';
console.log(params); //quite useful for debug
params.forEach(item => {
// console.log(item); //quite useful for debug
var xx = '<p>' + colorSpan('#00d4ff') + ' ' + item.seriesName + ': ' + item.data + '</p>'
rez += xx;
});
console.log(rez);
return rez;
}
},
series: [{
color:['#5470c6', '#91cc75', '#fac858', '#ee6666', '#73c0de', '#3ba272', '#fc8452', '#9a60b4', '#ea7ccc'],
type: 'line',
showSymbol: false,
data: valueList,
// smooth: true,
label:{
show:true,
position:'top'
},
lineStyle:{
color: {
type: 'linear',
x: 0, y: 1,x2:0,y2:0,
colorStops: [{
offset: 0, color: '#00d4ff' // color at 0% position
}, {
offset: 1, color: '#090979' // color at 100% position
}],
global:false
}
}
}]
};
console.log(myChart);
if (option && typeof option === 'object') {
myChart.setOption(option);
}

You need to add gradientColor array to echarts options. Now echart will take care of changing color of tooltip and data point. You can also remove your custom tooltip formatted function.
gradientColor: ["#00d4ff", "#090979"]
Here the complete options object:
var data = [];
var dateList = data.map(function(item) {
return item[0];
});
var valueList = data.map(function(item) {
return item[1];
});
option = {
gradientColor: ["#00d4ff", "#090979"],
// Make gradient line here
visualMap: [
{
show: true,
type: "continuous",
seriesIndex: 0,
min: 0,
max: 400
}
],
title: [
{
left: "center",
text: "Gradient along the y axis"
}
],
xAxis: [
{
data: dateList,
axisPointer: {
label: {
color: ["#5470c6"]
}
},
axisLabel: {
formatter: function(value) {
return moment(value).format("MMM YY");
// And other formatter tool (e.g. moment) can be used here.
}
}
}
],
yAxis: [
{
type: "value",
axisPointer: {
label: {
color: ["#5470c6"]
}
}
}
],
grid: [
{
width: "auto",
height: "auto"
}
],
tooltip: {
trigger: "axis",
axisPointer: {
animation: true
}
},
series: [
{
type: "line",
showSymbol: false,
data: valueList,
// smooth: true,
label: {
show: true,
position: "top"
}
}
]
};

Layer in Leaflet JS doesnt show again when check the control layer

I use the leaflet control layer to show up and remove the layer when I didn't wanna show the layer. when I uncheck my control layer it worked properly. the layer can disappear, but when I check again the control layer, the layer didn't show again. but there is no error in the console .
var pieChartGroup = L.featureGroup().addTo(map);
vals.forEach(val => {
var pictures = L.marker(val.location, {
icon: L.divIcon({
className: 'leaflet-echart-icon',
iconSize: [160, 160],
html: '<div id="marker' + val.id + '" style="width: 160px; height: 160px; position: relative; background-color: transparent;"></div>'
})
}).addTo(pieChartGroup);
// Based on the prepared dom, initialize the echarts instance
var myChart = echarts.init(document.getElementById('marker' + val.id));
// Specify chart configuration items and data
option = {
tooltip: {
trigger: 'item',
formatter: "{a} <br/>{b}: {c} ({d}%)"
},
series: [{
name: val.nama,
type: 'pie',
radius: ['10', '25'],
avoidLabelOverlap: false,
label: {
normal: {
show: false,
position: 'center'
},
emphasis: {
show: true,
textStyle: {
fontSize: '18',
fontWeight: 'bold'
}
}
},
labelLine: {
normal: {
show: false
}
},
data: [{
value: val.MB,
name: 'Masih Bersekolah'
}, {
value: val.TBL,
name: 'Tidak Bersekolah Lagi'
}, {
value: val.TBPS,
name: 'Tidak/Belum Pernah Bersekolah'
}]
}]
};
// Use the configuration items and data you just specified to display the chart.
myChart.setOption(option);
}
)
var baseLayers = {
"OpenStreetMap": LayerKita,
"OpenCycleMap": L.tileLayer('http://{s}.tile.opencyclemap.org/cycle/{z}/{x}/{y}.png'),
"Outdoors": L.tileLayer('http://{s}.tile.thunderforest.com/outdoors/{z}/{x}/{y}.png')
};
var overlays = {
"Bersekolah" : pieChartGroup
};
L.control.layers(baseLayers, overlays).addTo(map);

bar chart animation in descending order

I have a PHP search page where union members can check their seniority level. The results page displays their stats along with a chart.js horizontal bar chart showing their seniority level. all works great except the bar animates from the right.
I want the bar to animate from the left, from 397 up to their seniority level.
<script type="text/javascript">
$('#details').on('shown.bs.collapse', function () {
Chart.pluginService.register({
beforeRender: function (chart) {
if (chart.config.options.showAllTooltips) {
// create an array of tooltips
// we can't use the chart tooltip because there is only one tooltip per chart
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function (dataset, i) {
chart.getDatasetMeta(i).data.forEach(function (sector, j) {
chart.pluginTooltips.push(new Chart.Tooltip({
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options.tooltips,
_active: [sector]
}, chart));
});
});
// turn off normal tooltips
chart.options.tooltips.enabled = false;
}
},
afterDraw: function (chart, easing) {
if (chart.config.options.showAllTooltips) {
// we don't want the permanent tooltips to animate, so don't do anything till the animation runs at least once
if (!chart.allTooltipsOnce) {
if (easing !== 1)
return;
chart.allTooltipsOnce = true;
}
// turn on tooltips
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function (tooltip) {
tooltip.initialize();
tooltip.update();
// we don't actually need this since we are not animating tooltips
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
});
Chart.plugins.register({
beforeDraw: function(chartInstance, easing) {
var ctx = chartInstance.chart.ctx;
ctx.fillStyle = 'rgba(89,105,255,.15)'; // your color here
var chartArea = chartInstance.chartArea;
ctx.fillRect(chartArea.left, chartArea.top, chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
}
});
var ctx = document.getElementById("chartjs_bar").getContext('2d');
var data = myChart = new Chart(ctx, {
type: 'horizontalBar',
data: {
datasets: [{
backgroundColor: [
"#5969ff",
"#ff407b",
"#25d5f2",
"#ffc750",
"#2ec551",
"#7040fa",
"#ff004e"
],
data:<?php echo json_encode($ChartRank); ?>,
}]
},
options: {
showAllTooltips: true,
tooltips: {
displayColors:false,
custom: function(tooltip) { },
callbacks: {
// use label callback to return the desired label
label: function(tooltipItem, data) {
return "Your Seniority : " + tooltipItem.xLabel;
},
// remove title
title: function(tooltipItem, data) {
return;
}
}
},
title: {
display: true,
padding: 5,
text: 'Seniority level'
},
scales: {
xAxes: [{
display: true,
gridLines: {
display:false,
drawBorder:false
},
ticks: {
reverse:true,
min:1,
stepSize: 50,
max: 397
}
}],
yAxes: [{
display: true,
gridLines: {
display:false,
drawBorder:false
}
}]
},
responsive: true,
legend: {
display:false,
padding:0,
labels: {
fontColor: '#71748d',
fontFamily: 'Circular Std Book',
fontSize: 14,
}
},
}
});
});
</script>

How to display different tooltip based on data values in ChartJS v2?

I’m using ChartJs, to display a Line chart and I’m trying to do 2 things :
The first one is to display different colors based on the tooltip’s value. Highest value vs Medium value
The second one is to display a different tooltip if the tooltips value is the lowest. Minimun value
I’ve tried to use a custom plugins to do this, but It didn’t work
This is the code I've managed to do so far :
Chart.plugins.register({
beforeRender: function(chart) {
if (chart.config.options.showAllTooltips) {
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function(dataset, i) {
chart.getDatasetMeta(i).data.forEach(function(sector, j) {
console.log(j, sector);
chart.pluginTooltips.push(
new Chart.Tooltip(
{
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options.tooltips,
_active: [sector],
},
chart
)
);
});
});
// turn off normal tooltips
chart.options.tooltips.enabled = false;
}
},
afterDraw: function(chart, easing) {
if (chart.config.options.showAllTooltips) {
if (!chart.allTooltipsOnce) {
if (easing !== 1) return;
chart.allTooltipsOnce = true;
}
// turn on tooltips
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function(tooltip) {
tooltip.initialize();
tooltip._options.bodyFontFamily = "Visby";
// Change color based on value
tooltip._options.bodyFontColor = '#FEB122';
// Change tooltip's html if minimun value of dataset
// Values .datapoints[0].value
// console.log(tooltip._model);
tooltip._options.displayColors = false;
tooltip._options.bodyFontSize = tooltip._chart.height * 0.05;
tooltip._options.yPadding = 0;
tooltip._options.xPadding = 0;
tooltip.update();
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
});
let canvas = document.getElementById("myLineChart");
Chart.defaults.global.defaultFontFamily = "Visby";
const ctx = canvas.getContext('2d');
const labels = JSON.parse(ctx.canvas.dataset.dates);
const prices = JSON.parse(ctx.canvas.dataset.prices);
const myLineChart = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: [{
label: "Prix du billet",
data: prices,
backgroundColor: [
'rgba(0, 0, 0, 0)',
],
borderColor: [
'#F2F2F2',
],
pointBackgroundColor:
'#FEB122',
pointBorderColor:
'#FEB122',
borderWidth: 3,
}]
},
options: {
showAllTooltips: true, // call plugin we created
responsive: true,
cutoutPercentage: 60,
legend: {
position: "bottom"
},
animation: {
animateScale: true,
animateRotate: true
},
tooltips: {
enabled: false,
backgroundColor:"rgba(0,0,0,0)",
callbacks: {
title: function(tooltipItems, data) {
return "";
},
label: function(tooltipItem, data) {
var datasetLabel = "";
var label = data.labels[tooltipItem.index];
return data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index] + '€';
},
labelColor: function(tooltipItem, data) {
// console.log(data);
}
}
},
legend: {
display: false
},
layout: {
padding: {
left: 32,
right: 32,
top: 32,
bottom: 32
}
},
scales: {
xAxes: [{
gridLines: {
display: false,
drawBorder: false,
},
}],
yAxes: [{
display: false
}]
}
}
});
How could I make this work ?

I've managed to do that by using the plugin Chartjs Datalabels.
And using the scriptable colors options.

Highcharts - Change column color If data.point equal to string

I am creating a column type graph. Is there a way in javascript to change the color(which I want to define) of a column IF Gait == Walk
Here is an example of the graph im working on
https://jsfiddle.net/NRKSensors/4t6q5z0j/3/
$(function() {
Highcharts.setOptions({
colors: ['#ffffff', '#000000', '#666666']
});
var chart, merge = Highcharts.merge;
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'column',
zoomType: 'x ',
marginTop: 20,
borderColor: null,
borderRadius: 20,
borderWidth: 2,
backgroundColor: null,
},
title: {
text: null
},
subtitle: {
text: null
},
data: {
csv: document.getElementById('csv').innerHTML,
seriesMapping: [{
x: 0, // Insert X values in minutes
y: 1, // Insert Y values (Frequency)
label: 2 // Insert Labels (Standing,Walk, Trot, Canter, Jump)
}]
},
tooltip: {
useHTML: true,
formatter: function() {
point = this.point;
html = '<table>';
html += point.label + '</h3></th></tr>';
html += '</table>';
return html;
},
followPointer: true,
hideDelay: 200
},
exporting: {
buttons: {
contextButton: {
enabled: false
}
}
}, // Gemmer Export Menu knappen. Den tror jeg ikke vi skal anvende.
credits: {
enabled: false
},
series: [{
type: 'column',
color: 'black'
}],
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/data.js"></script>
<div id="container" style="width:100%; height:400px;"></div>
<pre id="csv" style="display:none">Touchdown,Frequency,Gait
22.414,100,"Walk"
22.42366667,100,"Walk"
22.43333333,103.4482759,Walk
22.44266667,96.77419355,Walk
22.45266667,96.77419355,Walk
24.69466667,136.3636364,Trot
24.70166667,125,Trot
24.70933333,136.3636364,Trot
24.71633333,120,Trot
24.72433333,130.4347826,Trot
25.11933333,68.18181818,Canter
25.13366667,88.23529412,Canter
25.14466667,85.71428571,Canter
25.156,88.23529412,Canter
</pre>
Do I need to prepare the data in the last column with qoutes?, so "Walk" instead of Walk?
Below is an example i made in Matlab. So I need to make it similar to this, but in highcharts
Matlab Column example

One way of doing this is to add a new column called color and set the value of this column based on the value of "Gait". This would be done in after highcharts have parsed the csv data like this:
data: {
csv: document.getElementById('csv').innerHTML, // Delete this line
seriesMapping: [{
x: 0, // Insert X values in minutes
y: 1, // Insert Y values (Frequency)
label: 2, // Insert Labels (Standing,Walk, Trot, Canter, Jump) NOT in quotes '' !!!
color: 3 //specify that column 3 is color
}],
parsed: function(columns) {
columns.push(['Color']) //Add a new column, color
for (var i = 0; i < columns[2].length; i++) {
if (columns[2][i] == 'Walk') {
columns[3].push('Red'); //Set color red for walk
} else if (columns[2][i] == 'Trot') {
columns[3].push('Blue');
} else if (columns[2][i] == 'Canter') {
columns[3].push('green');
} else { //Set grey for any gaits not found
columns[3].push('grey');
}
}
}
},
Working example: https://jsfiddle.net/ewolden/4t6q5z0j/40/
API on data.parsed: https://api.highcharts.com/highcharts/data.parsed