Data points
info
This page is part of an iterative guide (where we build onto code from the previous steps).
It is recommend that you follow the guide from the start. However, if you are only interested in the content on this page then take a look at the full code at the bottom of page for context of how this code fits into a working example.
In this section, we will modify the candlestick data such that we can individually set the color for each candlestick.
If we take a look at the interface for the candlestick data here: CandlestickData, we can see a few properties related to color: color, borderColor, and wickColor. Lightweight Charts™ allows the data points to override the colors specified for series as a whole. In other words, if a datapoint has one of these properties set then it will use that color for that data point instead of the colors used for the rest of the series. We can use this feature to highlight a few key data points in a different color.
We are going to change the color of all data points which have a close value over 205 to orange. We will use the map higher-order function to go through each data point and either leave it alone if it is below 205 or otherwise add the color and wickColor properties (set to 'orange'). We don't need to set the borderColor because we disabled that in an earlier step.
We are going to replace the following line of code:
const candleStickData = generateCandlestickData();
with this block of code:
// Generate sample data to use within a candlestick series
const candleStickData = generateCandlestickData().map(datapoint => {
// map function is changing the color for the individual
// candlestick points that close above 205
if (datapoint.close < 205) { return datapoint; }
// we are adding 'color' and 'wickColor' properties to the datapoint.
// Using spread syntax: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#spread_in_object_literals
return { ...datapoint, color: 'orange', wickColor: 'orange' };
});
Result
At this point we should have a chart like this (with a few candlesticks in orange):
View in a new windowNext steps
In the next step, we will add a few finishing touches to the chart.
Download
You can download the HTML file for example at this stage here in case you've encountered a problem or would like to start the next step from this point.
Complete code
Click here to reveal the complete code for the example at this stage of the guide.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta
name="viewport"
content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0"
/>
<title>Lightweight Charts™ Customization Tutorial</title>
<!-- Adding the standalone version of Lightweight charts -->
<script
type="text/javascript"
src="https://unpkg.com/lightweight-charts/dist/lightweight-charts.standalone.production.js"
></script>
<style>
body {
padding: 0;
margin: 0;
/* Add a background color to match the chart */
background-color: #222;
}
</style>
</head>
<body>
<div
id="container"
style="position: absolute; width: 100%; height: 100%"
></div>
<script type="text/javascript">
// Function to generate a sample set of Candlestick datapoints
function generateCandlestickData() {
return [
{
time: "2018-10-19",
open: 180.34,
high: 180.99,
low: 178.57,
close: 179.85,
},
{
time: "2018-10-22",
open: 180.82,
high: 181.4,
low: 177.56,
close: 178.75,
},
{
time: "2018-10-23",
open: 175.77,
high: 179.49,
low: 175.44,
close: 178.53,
},
{
time: "2018-10-24",
open: 178.58,
high: 182.37,
low: 176.31,
close: 176.97,
},
{
time: "2018-10-25",
open: 177.52,
high: 180.5,
low: 176.83,
close: 179.07,
},
{
time: "2018-10-26",
open: 176.88,
high: 177.34,
low: 170.91,
close: 172.23,
},
{
time: "2018-10-29",
open: 173.74,
high: 175.99,
low: 170.95,
close: 173.2,
},
{
time: "2018-10-30",
open: 173.16,
high: 176.43,
low: 172.64,
close: 176.24,
},
{
time: "2018-10-31",
open: 177.98,
high: 178.85,
low: 175.59,
close: 175.88,
},
{
time: "2018-11-01",
open: 176.84,
high: 180.86,
low: 175.9,
close: 180.46,
},
{
time: "2018-11-02",
open: 182.47,
high: 183.01,
low: 177.39,
close: 179.93,
},
{
time: "2018-11-05",
open: 181.02,
high: 182.41,
low: 179.3,
close: 182.19,
},
{
time: "2018-11-06",
open: 181.93,
high: 182.65,
low: 180.05,
close: 182.01,
},
{
time: "2018-11-07",
open: 183.79,
high: 187.68,
low: 182.06,
close: 187.23,
},
{
time: "2018-11-08",
open: 187.13,
high: 188.69,
low: 185.72,
close: 188.0,
},
{
time: "2018-11-09",
open: 188.32,
high: 188.48,
low: 184.96,
close: 185.99,
},
{
time: "2018-11-12",
open: 185.23,
high: 186.95,
low: 179.02,
close: 179.43,
},
{
time: "2018-11-13",
open: 177.3,
high: 181.62,
low: 172.85,
close: 179.0,
},
{
time: "2018-11-14",
open: 182.61,
high: 182.9,
low: 179.15,
close: 179.9,
},
{
time: "2018-11-15",
open: 179.01,
high: 179.67,
low: 173.61,
close: 177.36,
},
{
time: "2018-11-16",
open: 173.99,
high: 177.6,
low: 173.51,
close: 177.02,
},
{
time: "2018-11-19",
open: 176.71,
high: 178.88,
low: 172.3,
close: 173.59,
},
{
time: "2018-11-20",
open: 169.25,
high: 172.0,
low: 167.0,
close: 169.05,
},
{
time: "2018-11-21",
open: 170.0,
high: 170.93,
low: 169.15,
close: 169.3,
},
{
time: "2018-11-23",
open: 169.39,
high: 170.33,
low: 168.47,
close: 168.85,
},
{
time: "2018-11-26",
open: 170.2,
high: 172.39,
low: 168.87,
close: 169.82,
},
{
time: "2018-11-27",
open: 169.11,
high: 173.38,
low: 168.82,
close: 173.22,
},
{
time: "2018-11-28",
open: 172.91,
high: 177.65,
low: 170.62,
close: 177.43,
},
{
time: "2018-11-29",
open: 176.8,
high: 177.27,
low: 174.92,
close: 175.66,
},
{
time: "2018-11-30",
open: 175.75,
high: 180.37,
low: 175.11,
close: 180.32,
},
{
time: "2018-12-03",
open: 183.29,
high: 183.5,
low: 179.35,
close: 181.74,
},
{
time: "2018-12-04",
open: 181.06,
high: 182.23,
low: 174.55,
close: 175.3,
},
{
time: "2018-12-06",
open: 173.5,
high: 176.04,
low: 170.46,
close: 175.96,
},
{
time: "2018-12-07",
open: 175.35,
high: 178.36,
low: 172.24,
close: 172.79,
},
{
time: "2018-12-10",
open: 173.39,
high: 173.99,
low: 167.73,
close: 171.69,
},
{
time: "2018-12-11",
open: 174.3,
high: 175.6,
low: 171.24,
close: 172.21,
},
{
time: "2018-12-12",
open: 173.75,
high: 176.87,
low: 172.81,
close: 174.21,
},
{
time: "2018-12-13",
open: 174.31,
high: 174.91,
low: 172.07,
close: 173.87,
},
{
time: "2018-12-14",
open: 172.98,
high: 175.14,
low: 171.95,
close: 172.29,
},
{
time: "2018-12-17",
open: 171.51,
high: 171.99,
low: 166.93,
close: 167.97,
},
{
time: "2018-12-18",
open: 168.9,
high: 171.95,
low: 168.5,
close: 170.04,
},
{
time: "2018-12-19",
open: 170.92,
high: 174.95,
low: 166.77,
close: 167.56,
},
{
time: "2018-12-20",
open: 166.28,
high: 167.31,
low: 162.23,
close: 164.16,
},
{
time: "2018-12-21",
open: 162.81,
high: 167.96,
low: 160.17,
close: 160.48,
},
{
time: "2018-12-24",
open: 160.16,
high: 161.4,
low: 158.09,
close: 158.14,
},
{
time: "2018-12-26",
open: 159.46,
high: 168.28,
low: 159.44,
close: 168.28,
},
{
time: "2018-12-27",
open: 166.44,
high: 170.46,
low: 163.36,
close: 170.32,
},
{
time: "2018-12-28",
open: 171.22,
high: 173.12,
low: 168.6,
close: 170.22,
},
{
time: "2018-12-31",
open: 171.47,
high: 173.24,
low: 170.65,
close: 171.82,
},
{
time: "2019-01-02",
open: 169.71,
high: 173.18,
low: 169.05,
close: 172.41,
},
{
time: "2019-01-03",
open: 171.84,
high: 171.84,
low: 168.21,
close: 168.61,
},
{
time: "2019-01-04",
open: 170.18,
high: 174.74,
low: 169.52,
close: 173.62,
},
{
time: "2019-01-07",
open: 173.83,
high: 178.18,
low: 173.83,
close: 177.04,
},
{
time: "2019-01-08",
open: 178.57,
high: 179.59,
low: 175.61,
close: 177.89,
},
{
time: "2019-01-09",
open: 177.87,
high: 181.27,
low: 177.1,
close: 179.73,
},
{
time: "2019-01-10",
open: 178.03,
high: 179.24,
low: 176.34,
close: 179.06,
},
{
time: "2019-01-11",
open: 177.93,
high: 180.26,
low: 177.12,
close: 179.41,
},
{
time: "2019-01-14",
open: 177.59,
high: 179.23,
low: 176.9,
close: 178.81,
},
{
time: "2019-01-15",
open: 176.08,
high: 177.82,
low: 175.2,
close: 176.47,
},
{
time: "2019-01-16",
open: 177.09,
high: 177.93,
low: 175.86,
close: 177.04,
},
{
time: "2019-01-17",
open: 174.01,
high: 175.46,
low: 172.0,
close: 174.87,
},
{
time: "2019-01-18",
open: 176.98,
high: 180.04,
low: 176.18,
close: 179.58,
},
{
time: "2019-01-22",
open: 177.49,
high: 178.6,
low: 175.36,
close: 177.11,
},
{
time: "2019-01-23",
open: 176.59,
high: 178.06,
low: 174.53,
close: 176.89,
},
{
time: "2019-01-24",
open: 177.0,
high: 177.53,
low: 175.3,
close: 177.29,
},
{
time: "2019-01-25",
open: 179.78,
high: 180.87,
low: 178.61,
close: 180.4,
},
{
time: "2019-01-28",
open: 178.97,
high: 179.99,
low: 177.41,
close: 179.83,
},
{
time: "2019-01-29",
open: 178.96,
high: 180.15,
low: 178.09,
close: 179.69,
},
{
time: "2019-01-30",
open: 180.47,
high: 184.2,
low: 179.78,
close: 182.18,
},
{
time: "2019-01-31",
open: 181.5,
high: 184.67,
low: 181.06,
close: 183.53,
},
{
time: "2019-02-01",
open: 184.03,
high: 185.15,
low: 182.83,
close: 184.37,
},
{
time: "2019-02-04",
open: 184.3,
high: 186.43,
low: 183.84,
close: 186.43,
},
{
time: "2019-02-05",
open: 186.89,
high: 186.99,
low: 184.69,
close: 186.39,
},
{
time: "2019-02-06",
open: 186.69,
high: 186.69,
low: 184.06,
close: 184.72,
},
{
time: "2019-02-07",
open: 183.74,
high: 184.92,
low: 182.45,
close: 184.07,
},
{
time: "2019-02-08",
open: 183.05,
high: 184.58,
low: 182.72,
close: 184.54,
},
{
time: "2019-02-11",
open: 185.0,
high: 185.42,
low: 182.75,
close: 182.92,
},
{
time: "2019-02-12",
open: 183.84,
high: 186.4,
low: 183.52,
close: 185.52,
},
{
time: "2019-02-13",
open: 186.3,
high: 188.68,
low: 185.92,
close: 188.41,
},
{
time: "2019-02-14",
open: 187.5,
high: 188.93,
low: 186.0,
close: 187.71,
},
{
time: "2019-02-15",
open: 189.87,
high: 192.62,
low: 189.05,
close: 192.39,
},
{
time: "2019-02-19",
open: 191.71,
high: 193.19,
low: 191.28,
close: 192.33,
},
{
time: "2019-02-20",
open: 192.39,
high: 192.4,
low: 191.11,
close: 191.85,
},
{
time: "2019-02-21",
open: 191.85,
high: 192.37,
low: 190.61,
close: 191.82,
},
{
time: "2019-02-22",
open: 191.69,
high: 192.54,
low: 191.62,
close: 192.39,
},
{
time: "2019-02-25",
open: 192.75,
high: 193.42,
low: 189.96,
close: 189.98,
},
{
time: "2019-02-26",
open: 185.59,
high: 188.47,
low: 182.8,
close: 188.3,
},
{
time: "2019-02-27",
open: 187.9,
high: 188.5,
low: 183.21,
close: 183.67,
},
{
time: "2019-02-28",
open: 183.6,
high: 185.19,
low: 183.11,
close: 185.14,
},
{
time: "2019-03-01",
open: 185.82,
high: 186.56,
low: 182.86,
close: 185.17,
},
{
time: "2019-03-04",
open: 186.2,
high: 186.24,
low: 182.1,
close: 183.81,
},
{
time: "2019-03-05",
open: 184.24,
high: 185.12,
low: 183.25,
close: 184.0,
},
{
time: "2019-03-06",
open: 184.53,
high: 184.97,
low: 183.84,
close: 184.45,
},
{
time: "2019-03-07",
open: 184.39,
high: 184.62,
low: 181.58,
close: 182.51,
},
{
time: "2019-03-08",
open: 181.49,
high: 181.91,
low: 179.52,
close: 181.23,
},
{
time: "2019-03-11",
open: 182.0,
high: 183.2,
low: 181.2,
close: 182.44,
},
{
time: "2019-03-12",
open: 183.43,
high: 184.27,
low: 182.33,
close: 184.0,
},
{
time: "2019-03-13",
open: 183.24,
high: 183.78,
low: 181.08,
close: 181.14,
},
{
time: "2019-03-14",
open: 181.28,
high: 181.74,
low: 180.5,
close: 181.61,
},
{
time: "2019-03-15",
open: 182.3,
high: 182.49,
low: 179.57,
close: 182.23,
},
{
time: "2019-03-18",
open: 182.53,
high: 183.48,
low: 182.33,
close: 183.42,
},
{
time: "2019-03-19",
open: 184.19,
high: 185.82,
low: 183.48,
close: 184.13,
},
{
time: "2019-03-20",
open: 184.3,
high: 187.12,
low: 183.43,
close: 186.1,
},
{
time: "2019-03-21",
open: 185.5,
high: 190.0,
low: 185.5,
close: 189.97,
},
{
time: "2019-03-22",
open: 189.31,
high: 192.05,
low: 188.67,
close: 188.75,
},
{
time: "2019-03-25",
open: 188.75,
high: 191.71,
low: 188.51,
close: 189.68,
},
{
time: "2019-03-26",
open: 190.69,
high: 192.19,
low: 188.74,
close: 189.34,
},
{
time: "2019-03-27",
open: 189.65,
high: 191.61,
low: 188.39,
close: 189.25,
},
{
time: "2019-03-28",
open: 189.91,
high: 191.4,
low: 189.16,
close: 190.06,
},
{
time: "2019-03-29",
open: 190.85,
high: 192.04,
low: 190.14,
close: 191.89,
},
{
time: "2019-04-01",
open: 192.99,
high: 195.9,
low: 192.85,
close: 195.64,
},
{
time: "2019-04-02",
open: 195.5,
high: 195.5,
low: 194.01,
close: 194.31,
},
{
time: "2019-04-03",
open: 194.98,
high: 198.78,
low: 194.11,
close: 198.61,
},
{
time: "2019-04-04",
open: 199.0,
high: 200.49,
low: 198.02,
close: 200.45,
},
{
time: "2019-04-05",
open: 200.86,
high: 203.13,
low: 200.61,
close: 202.06,
},
{
time: "2019-04-08",
open: 201.37,
high: 203.79,
low: 201.24,
close: 203.55,
},
{
time: "2019-04-09",
open: 202.26,
high: 202.71,
low: 200.46,
close: 200.9,
},
{
time: "2019-04-10",
open: 201.26,
high: 201.6,
low: 198.02,
close: 199.43,
},
{
time: "2019-04-11",
open: 199.9,
high: 201.5,
low: 199.03,
close: 201.48,
},
{
time: "2019-04-12",
open: 202.13,
high: 204.26,
low: 202.13,
close: 203.85,
},
{
time: "2019-04-15",
open: 204.16,
high: 205.14,
low: 203.4,
close: 204.86,
},
{
time: "2019-04-16",
open: 205.25,
high: 205.99,
low: 204.29,
close: 204.47,
},
{
time: "2019-04-17",
open: 205.34,
high: 206.84,
low: 205.32,
close: 206.55,
},
{
time: "2019-04-18",
open: 206.02,
high: 207.78,
low: 205.1,
close: 205.66,
},
{
time: "2019-04-22",
open: 204.11,
high: 206.25,
low: 204.0,
close: 204.78,
},
{
time: "2019-04-23",
open: 205.14,
high: 207.33,
low: 203.43,
close: 206.05,
},
{
time: "2019-04-24",
open: 206.16,
high: 208.29,
low: 205.54,
close: 206.72,
},
{
time: "2019-04-25",
open: 206.01,
high: 207.72,
low: 205.06,
close: 206.5,
},
{
time: "2019-04-26",
open: 205.88,
high: 206.14,
low: 203.34,
close: 203.61,
},
{
time: "2019-04-29",
open: 203.31,
high: 203.8,
low: 200.34,
close: 202.16,
},
{
time: "2019-04-30",
open: 201.55,
high: 203.75,
low: 200.79,
close: 203.7,
},
{
time: "2019-05-01",
open: 203.2,
high: 203.52,
low: 198.66,
close: 198.8,
},
{
time: "2019-05-02",
open: 199.3,
high: 201.06,
low: 198.8,
close: 201.01,
},
{
time: "2019-05-03",
open: 202.0,
high: 202.31,
low: 200.32,
close: 200.56,
},
{
time: "2019-05-06",
open: 198.74,
high: 199.93,
low: 198.31,
close: 199.63,
},
{
time: "2019-05-07",
open: 196.75,
high: 197.65,
low: 192.96,
close: 194.77,
},
{
time: "2019-05-08",
open: 194.49,
high: 196.61,
low: 193.68,
close: 195.17,
},
{
time: "2019-05-09",
open: 193.31,
high: 195.08,
low: 191.59,
close: 194.58,
},
{
time: "2019-05-10",
open: 193.21,
high: 195.49,
low: 190.01,
close: 194.58,
},
{
time: "2019-05-13",
open: 191.0,
high: 191.66,
low: 189.14,
close: 190.34,
},
{
time: "2019-05-14",
open: 190.5,
high: 192.76,
low: 190.01,
close: 191.62,
},
{
time: "2019-05-15",
open: 190.81,
high: 192.81,
low: 190.27,
close: 191.76,
},
{
time: "2019-05-16",
open: 192.47,
high: 194.96,
low: 192.2,
close: 192.38,
},
{
time: "2019-05-17",
open: 190.86,
high: 194.5,
low: 190.75,
close: 192.58,
},
{
time: "2019-05-20",
open: 191.13,
high: 192.86,
low: 190.61,
close: 190.95,
},
{
time: "2019-05-21",
open: 187.13,
high: 192.52,
low: 186.34,
close: 191.45,
},
{
time: "2019-05-22",
open: 190.49,
high: 192.22,
low: 188.05,
close: 188.91,
},
{
time: "2019-05-23",
open: 188.45,
high: 192.54,
low: 186.27,
close: 192.0,
},
{
time: "2019-05-24",
open: 192.54,
high: 193.86,
low: 190.41,
close: 193.59,
},
];
}
// Create the Lightweight Chart within the container element
const chart = LightweightCharts.createChart(
document.getElementById('container'),
{
layout: {
background: { color: "#222" },
textColor: "#C3BCDB",
},
grid: {
vertLines: { color: "#444" },
horzLines: { color: "#444" },
},
}
);
// Setting the border color for the vertical axis
chart.priceScale().applyOptions({
borderColor: "#71649C",
});
// Setting the border color for the horizontal axis
chart.timeScale().applyOptions({
borderColor: "#71649C",
});
// Adjust the starting bar width (essentially the horizontal zoom)
chart.timeScale().applyOptions({
barSpacing: 10,
});
// Get the current users primary locale
const currentLocale = window.navigator.languages[0];
// Create a number format using Intl.NumberFormat
const myPriceFormatter = Intl.NumberFormat(currentLocale, {
style: "currency",
currency: "EUR", // Currency for data points
}).format;
// Apply the custom priceFormatter to the chart
chart.applyOptions({
localization: {
priceFormatter: myPriceFormatter,
},
});
// Customizing the Crosshair
chart.applyOptions({
crosshair: {
// Change mode from default 'magnet' to 'normal'.
// Allows the crosshair to move freely without snapping to datapoints
mode: LightweightCharts.CrosshairMode.Normal,
// Vertical crosshair line (showing Date in Label)
vertLine: {
width: 8,
color: "#C3BCDB44",
style: LightweightCharts.LineStyle.Solid,
labelBackgroundColor: "#9B7DFF",
},
// Horizontal crosshair line (showing Price in Label)
horzLine: {
color: "#9B7DFF",
labelBackgroundColor: "#9B7DFF",
},
},
});
// Generate sample data to use within a candlestick series
const candleStickData = generateCandlestickData().map((datapoint) => {
// map function is changing the color for the individual
// candlestick points that close above 205
if (datapoint.close < 205) return datapoint;
// we are adding 'color' and 'wickColor' properties to the datapoint.
// Using spread syntax: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#spread_in_object_literals
return { ...datapoint, color: "orange", wickColor: "orange" };
});
// Convert the candlestick data for use with a line series
const lineData = candleStickData.map((datapoint) => ({
time: datapoint.time,
value: (datapoint.close + datapoint.open) / 2,
}));
// Add an area series to the chart,
// Adding this before we add the candlestick chart
// so that it will appear beneath the candlesticks
const areaSeries = chart.addAreaSeries({
lastValueVisible: false, // hide the last value marker for this series
crosshairMarkerVisible: false, // hide the crosshair marker for this series
lineColor: "transparent", // hide the line
topColor: "rgba(56, 33, 110,0.6)",
bottomColor: "rgba(56, 33, 110, 0.1)",
});
// Set the data for the Area Series
areaSeries.setData(lineData);
// Create the Main Series (Candlesticks)
const mainSeries = chart.addCandlestickSeries();
// Set the data for the Main Series
mainSeries.setData(candleStickData);
// Changing the Candlestick colors
mainSeries.applyOptions({
wickUpColor: "rgb(54, 116, 217)",
upColor: "rgb(54, 116, 217)",
wickDownColor: "rgb(225, 50, 85)",
downColor: "rgb(225, 50, 85)",
borderVisible: false,
});
// Adjust the options for the priceScale of the mainSeries
mainSeries.priceScale().applyOptions({
autoScale: false, // disables auto scaling based on visible content
scaleMargins: {
top: 0.1,
bottom: 0.2,
},
});
// Adding a window resize event handler to resize the chart when
// the window size changes.
// Note: for more advanced examples (when the chart doesn't fill the entire window)
// you may need to use ResizeObserver -> https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver
window.addEventListener("resize", () => {
chart.resize(window.innerWidth, window.innerHeight);
});
</script>
</body>
</html>