Title
How to monitor the change of DataZoom?
Description
It is necessary to obtain the state information of the user's interaction with the chart dataZoom for the next rendering to preserve the state of dataZoom.
Solution
Different chart libraries have different solutions. VChart provides the dataZoomChange event to obtain the new start and end points of the chart after the DataZoom change, as well as other information.
After obtaining the new start and end, users can save this information and rewrite it back to the spec when needed, thus making the dataZoom state persistent.
Code Example
import { StrictMode, useEffect } from "react";
import { createRoot } from "react-dom/client";
const rootElement = document.getElementById("root");
const root = createRoot(rootElement);
import VChart from "@visactor/vchart";
const App = () => {
useEffect(() => {
const spec = {
type: "scatter",
xField: "revenues_mm",
yField: "profit_mm",
seriesField: "category",
dataZoom: [
{
orient: "bottom",
start: 0,
end: 0.4,
minSpan: 0.2,
maxSpan: 0.8,
filterMode: "axis",
},
],
axes: [
{
title: {
visible: true,
text: "revenues_mm",
},
orient: "left",
type: "linear",
},
{
title: {
visible: true,
text: "profit_mm",
},
orient: "bottom",
label: { visible: true },
type: "linear",
},
],
legends: [{}],
data: [
{
id: "data",
values: [
{
company: "Johnson & Johnson",
revenues_mm: 71890,
profit_mm: 18540,
profit_as_of_revenues: 0.2578940047294478,
category: "Pharmaceuticals",
},
{
company: "Procter & Gamble",
revenues_mm: 71726,
profit_mm: 10508,
profit_as_of_revenues: 0.14650196581434904,
category: "Household & Personal Products",
},
{
company: "Abbvie",
revenues_mm: 25638,
profit_mm: 5953,
profit_as_of_revenues: 0.23219439893907481,
category: "Pharmaceuticals",
},
{
company: "Amgen",
revenues_mm: 22991,
profit_mm: 7722,
profit_as_of_revenues: 0.33587055804445215,
category: "Pharmaceuticals",
},
{
company: "Eli Lilly",
revenues_mm: 21222,
profit_mm: 2738,
profit_as_of_revenues: 0.12901705777023842,
category: "Pharmaceuticals",
},
{
company: "Bristol-Myers Squibb",
revenues_mm: 19427,
profit_mm: 4457,
profit_as_of_revenues: 0.22942296803417925,
category: "Pharmaceuticals",
},
{
company: "Altria Group",
revenues_mm: 19337,
profit_mm: 14239,
profit_as_of_revenues: 0.7363603454517247,
category: "Tobacco",
},
{
company: "Kimberly-Clark",
revenues_mm: 18202,
profit_mm: 2166,
profit_as_of_revenues: 0.11899791231732777,
category: "Household & Personal Products",
},
{
company: "General Mills",
revenues_mm: 16563,
profit_mm: 1697,
profit_as_of_revenues: 0.10245728430839823,
category: "Food",
},
{
company: "Colgate-Palmolive",
revenues_mm: 15195,
profit_mm: 2441,
profit_as_of_revenues: 0.16064494899638038,
category: "Household & Personal Products",
},
{
company: "Conagra Brands",
revenues_mm: 14134,
profit_mm: -677,
profit_as_of_revenues: -0.04789868402433847,
category: "Food",
},
{
company: "Land O'Lakes",
revenues_mm: 13233,
profit_mm: 245,
profit_as_of_revenues: 0.01851432025995617,
category: "Food",
},
{
company: "Pepsico",
revenues_mm: 62789,
profit_mm: 6329,
profit_as_of_revenues: 0.1007979104620236,
category: "Food",
},
{
company: "Kellogg",
revenues_mm: 13014,
profit_mm: 694,
profit_as_of_revenues: 0.053327186107269095,
category: "Food",
},
{
company: "Reynolds American",
revenues_mm: 12503,
profit_mm: 6073,
profit_as_of_revenues: 0.48572342637766935,
category: "Tobacco",
},
{
company: "Biogen",
revenues_mm: 11449,
profit_mm: 3703,
profit_as_of_revenues: 0.32343436107957024,
category: "Pharmaceuticals",
},
{
company: "Estee Lauder",
revenues_mm: 11262,
profit_mm: 1115,
profit_as_of_revenues: 0.09900550523885633,
category: "Household & Personal Products",
},
{
company: "Celgene",
revenues_mm: 11229,
profit_mm: 1999,
profit_as_of_revenues: 0.17802119511977915,
category: "Pharmaceuticals",
},
{
company: "Hormel Foods",
revenues_mm: 9523,
profit_mm: 890,
profit_as_of_revenues: 0.09345794392523364,
category: "Food",
},
{
company: "Campbell Soup",
revenues_mm: 7961,
profit_mm: 563,
profit_as_of_revenues: 0.07071975882426831,
category: "Food",
},
{
company: "J. M. Smucker",
revenues_mm: 7811,
profit_mm: 689,
profit_as_of_revenues: 0.08820893611573422,
category: "Food",
},
{
company: "Dean Foods",
revenues_mm: 7710,
profit_mm: 120,
profit_as_of_revenues: 0.01556420233463035,
category: "Food",
},
{
company: "Hershey",
revenues_mm: 7440,
profit_mm: 720,
profit_as_of_revenues: 0.0967741935483871,
category: "Food",
},
{
company: "Pfizer",
revenues_mm: 52824,
profit_mm: 7215,
profit_as_of_revenues: 0.13658564288959563,
category: "Pharmaceuticals",
},
{
company: "Constellation Brands",
revenues_mm: 6548,
profit_mm: 1055,
profit_as_of_revenues: 0.16111789859499084,
category: "Beverages",
},
{
company: "Dr. Pepper Snapple Group",
revenues_mm: 6440,
profit_mm: 847,
profit_as_of_revenues: 0.13152173913043477,
category: "Beverages",
},
{
company: "HRG Group",
revenues_mm: 6403,
profit_mm: -199,
profit_as_of_revenues: -0.031079181633609246,
category: "Household & Personal Products",
},
{
company: "Treehouse Foods",
revenues_mm: 6175,
profit_mm: -229,
profit_as_of_revenues: -0.03708502024291498,
category: "Food",
},
{
company: "Avon Products",
revenues_mm: 5853,
profit_mm: -108,
profit_as_of_revenues: -0.018452075858534086,
category: "Household & Personal Products",
},
{
company: "Clorox",
revenues_mm: 5761,
profit_mm: 648,
profit_as_of_revenues: 0.11248047214025343,
category: "Household & Personal Products",
},
{
company: "Coca-Cola",
revenues_mm: 41863,
profit_mm: 6527,
profit_as_of_revenues: 0.15591333635907603,
category: "Beverages",
},
{
company: "Merck",
revenues_mm: 39807,
profit_mm: 3920,
profit_as_of_revenues: 0.09847514256286583,
category: "Pharmaceuticals",
},
{
company: "Gilead Sciences",
revenues_mm: 30390,
profit_mm: 13501,
profit_as_of_revenues: 0.4442579795985522,
category: "Pharmaceuticals",
},
{
company: "Philip Morris International",
revenues_mm: 26685,
profit_mm: 6967,
profit_as_of_revenues: 0.2610830054337643,
category: "Tobacco",
},
{
company: "Kraft Heinz",
revenues_mm: 26487,
profit_mm: 3632,
profit_as_of_revenues: 0.1371238720881942,
category: "Food",
},
{
company: "Mondelez International",
revenues_mm: 25923,
profit_mm: 1659,
profit_as_of_revenues: 0.06399722254368707,
category: "Food",
},
],
},
],
};
const vchart = new VChart(spec, { dom: "chart" });
vchart.renderSync();
vchart.on("dataZoomChange", (params) => {
const { value } = params;
console.log("changed value:", value.start, value.end);
});
return () => {
vchart.release();
};
}, []);
return <div id="chart"></div>;
};
root.render(
<StrictMode>
<App />
</StrictMode>
);
Result
Online Demo: https://codesandbox.io/p/sandbox/vchart-datazoom-event-kczn5h?file=%2Fsrc%2Findex.js%3A1%2C1-327%2C1
Related Documentation
DataZoom Event API: https://visactor.io/vchart/api/API/event
Github: https://github.com/VisActor/VChart
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