Section 1.1: Implementing Simple Event Handling

One of the strengths of Victory is the ability to directly attach events to chart components. For instance, consider the following code snippet:

import React from "react";

import { Bar } from "victory";

export default function App() {

return (

<Bar

events={[{

target: "data",

eventHandlers: {

onClick: () => {

return [{

target: "data",

mutation: (evt) => {

alert((${evt.clientX}, ${evt.clientY}));

}

}];

}

}

}]}

/>

);

}

In this example, we utilize the events prop on the Bar component to handle click events, capturing the coordinates through clientX and clientY from the event object.

Section 1.2: Custom Component Event Handlers

You can also assign event handlers to custom components within Victory. Here's how to create a ScatterPoint component that manages hover and click events:

import React from "react";

import { VictoryScatter } from "victory";

const ScatterPoint = ({ x, y, datum }) => {

const [selected, setSelected] = React.useState(false);

const [hovered, setHovered] = React.useState(false);

return (

<VictoryScatter

data={[{ x, y }]}

style={{

data: { fill: selected ? "gold" : hovered ? "orange" : "tomato" }

}}

onClick={() => setSelected(!selected)}

onMouseEnter={() => setHovered(true)}

onMouseLeave={() => setHovered(false)}

/>

);

};

export default function App() {

return (

<VictoryChart>

<ScatterPoint />

</VictoryChart>

);

}

This component uses onMouseEnter, onMouseLeave, and onClick props to handle mouse events.

Section 2.1: Adjusting Render Order

The rendering order of components can be modified to control which elements appear on top. For example:

import React from "react";

import { VictoryChart, VictoryLine, VictoryScatter } from "victory";

export default function App() {

return (

<VictoryChart>

<VictoryScatter

data={[{ x: 1, y: Math.sin(2 * Math.PI * 1) }]}

size={5}

style={{ data: { fill: "tomato" } }}

/>

<VictoryLine

data={[{ x: 1, y: Math.sin(2 * Math.PI * 1) }]}

/>

</VictoryChart>

);

}

Here, the scatter points are rendered first, positioning them beneath the line.

Section 2.2: Utilizing VictoryPortal for Layering

The VictoryPortal component allows for rendering elements in a top-level container, ensuring they are displayed above other components. For example:

import React from "react";

import { VictoryLabel, VictoryPortal } from "victory";

export default function App() {

return (

<VictoryChart>

<VictoryPortal>

<VictoryLabel text="Top Label" />

</VictoryPortal>

</VictoryChart>

);

}

This approach guarantees that the labels are rendered above all other chart components.