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Styling Events

Events

Change the styling of individual events or event types.

Styling Events
View live example →

Use the controls below the timeline to change the styles of events.

Properties for each event are stored within its object in a simple format.

Each event can be styled individually.

See also:

import { createTimeline } from "kronograph";
import { entities, events } from "./data";

const defaultEventType = {
  color: "entity",
  lineWidth: 2,
  showArrows: true,
};

const eventTypes = { default: defaultEventType };

const timeline = createTimeline("my-timeline");

timeline.set({ entities, events, eventTypes });
timeline.fit();

// Define the setting for each select control
const selectToProp = {
  color: (value) => {
    return { color: value };
  },
  "line-width": (value) => {
    return { lineWidth: Number(value) };
  },
  "show-arrows": (value) => {
    return { showArrows: value === "true" };
  },
};

// When a select control changes, apply the setting to the default event type and update the timeline
Object.keys(selectToProp).forEach((selectName) => {
  document.getElementById(selectName).addEventListener("change", (e) => {
    Object.assign(defaultEventType, selectToProp[selectName](e.target.value));
    timeline.set({ entities, events, eventTypes });
  });
});
export const entities = {
  "smith-johnathan-151": {
    label: "John Smith",
  },
  "west-josephine-126": {
    label: "Josephine West",
    color: "#ff9147",
  },
  "roberts-nathaniel-023": {
    label: "Nathan Roberts",
    color: "#f7d06e",
  },
  "baxter-eleanor-004": {
    label: "Ella Baxter",
    color: "#e12d39",
  },
};

export const events = {
  "email 1": {
    entityIds: ["smith-johnathan-151", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 8, 49),
  },
  "email 2": {
    entityIds: ["smith-johnathan-151", "baxter-eleanor-004"],
    time: new Date(2025, 7, 14, 8, 56),
  },
  "email 3": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 9, 2),
  },
  "email 4": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 9, 27),
  },
  "email 5": {
    entityIds: ["baxter-eleanor-004", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 10, 20),
  },
  "email 6": {
    entityIds: ["roberts-nathaniel-023", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 10, 30),
  },
  "email 7": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 10, 34),
  },
  "email 8": {
    entityIds: ["west-josephine-126", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 10, 40),
  },
  "email 9": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 10, 51),
  },
  "email 10": {
    entityIds: ["west-josephine-126", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 12, 5),
  },
  "email 11": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 14, 37),
  },
  "email 12": {
    entityIds: ["baxter-eleanor-004", "west-josephine-126"],
    time: new Date(2025, 7, 14, 16, 7),
  },
  "email 13": {
    entityIds: ["west-josephine-126", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 17, 42),
  },
};
<!doctype html>
<html>
  <head>
    <link rel="stylesheet" href="@ci/theme/kg/css/examples.css" />
  </head>
  <body>
    <div class="story">
      <div class="story__timeline" id="my-timeline"></div>
      <div class="story__controls story__controls--row">
        <div class="stack">
          <div class="story__controls__item">
            <label for="color">Color</label>
            <select id="color" class="story__controls__item__child--flex-2 select">
              <option value="from">From</option>
              <option value="to">To</option>
              <option value="entity" selected>Entity</option>
              <option value="inverse">Inverse</option>
              <option value="#e12d39">Red</option>
              <option value="#e9b949">Yellow</option>
            </select>
          </div>
        </div>
        <div class="stack">
          <div class="story__controls__item">
            <label for="line-width" class="story__controls__item__child--flex-2">Line Width</label>
            <select id="line-width" class="select">
              <option value="1">1</option>
              <option value="2" selected>2</option>
              <option value="4">4</option>
              <option value="8">8</option>
              <option value="16">16</option>
            </select>
          </div>
          <div class="story__controls__item">
            <label for="show-arrows" class="story__controls__item__child--flex-2"
              >Show Arrows</label
            >
            <select id="show-arrows" class="select">
              <option value="true" selected>True</option>
              <option value="false">False</option>
            </select>
          </div>
        </div>
      </div>
    </div>
    <script type="module" src="./code.js"></script>
  </body>
</html>
import React, { useState } from "react";
import { createRoot } from "react-dom/client";
import Timeline from "kronograph/react/Timeline";

import { entities, events } from "./data";

export const Demo = () => {
  const [eventTypes, setEventTypes] = useState({
    default: {
      color: "entity",
      lineWidth: 2,
      showArrows: true,
    },
  });

  return (
    <div className="story">
      <Timeline
        className="story__timeline"
        entities={entities}
        events={events}
        eventTypes={eventTypes}
      />

      <div className="story__controls story__controls--row">
        <div className="stack">
          <div className="story__controls__item">
            <label htmlFor="color">Color</label>
            <select
              id="color"
              className="story__controls__item__child--flex-2 select"
              defaultValue="entity"
              onChange={(e) => {
                setEventTypes({ default: { ...eventTypes.default, color: e.target.value } });
              }}
            >
              <option value="from">From</option>
              <option value="to">To</option>
              <option value="entity">Entity</option>
              <option value="inverse">Inverse</option>
              <option value="#e12d39">Red</option>
              <option value="#e9b949">Yellow</option>
            </select>
          </div>
        </div>
        <div className="stack">
          <div className="story__controls__item">
            <label htmlFor="line-width" className="story__controls__item__child--flex-2">
              Line Width
            </label>
            <select
              id="line-width"
              className="select"
              defaultValue="2"
              onChange={(e) => {
                setEventTypes({
                  default: { ...eventTypes.default, lineWidth: Number(e.target.value) },
                });
              }}
            >
              <option value="1">1</option>
              <option value="2">2</option>
              <option value="4">4</option>
              <option value="8">8</option>
              <option value="16">16</option>
            </select>
          </div>
          <div className="story__controls__item">
            <label htmlFor="show-arrows" className="story__controls__item__child--flex-2">
              Show Arrows
            </label>
            <select
              id="show-arrows"
              className="select"
              defaultValue="true"
              onChange={(e) => {
                setEventTypes({
                  default: { ...eventTypes.default, showArrows: e.target.value === "true" },
                });
              }}
            >
              <option value="true">True</option>
              <option value="false">False</option>
            </select>
          </div>
        </div>
      </div>
    </div>
  );
};

const root = createRoot(document.getElementById("my-timeline"));
root.render(<Demo />);
export const entities = {
  "smith-johnathan-151": {
    label: "John Smith",
  },
  "west-josephine-126": {
    label: "Josephine West",
    color: "#ff9147",
  },
  "roberts-nathaniel-023": {
    label: "Nathan Roberts",
    color: "#f7d06e",
  },
  "baxter-eleanor-004": {
    label: "Ella Baxter",
    color: "#e12d39",
  },
};

export const events = {
  "email 1": {
    entityIds: ["smith-johnathan-151", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 8, 49),
  },
  "email 2": {
    entityIds: ["smith-johnathan-151", "baxter-eleanor-004"],
    time: new Date(2025, 7, 14, 8, 56),
  },
  "email 3": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 9, 2),
  },
  "email 4": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 9, 27),
  },
  "email 5": {
    entityIds: ["baxter-eleanor-004", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 10, 20),
  },
  "email 6": {
    entityIds: ["roberts-nathaniel-023", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 10, 30),
  },
  "email 7": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 10, 34),
  },
  "email 8": {
    entityIds: ["west-josephine-126", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 10, 40),
  },
  "email 9": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 10, 51),
  },
  "email 10": {
    entityIds: ["west-josephine-126", "smith-johnathan-151"],
    time: new Date(2025, 7, 14, 12, 5),
  },
  "email 11": {
    entityIds: ["smith-johnathan-151", "west-josephine-126"],
    time: new Date(2025, 7, 14, 14, 37),
  },
  "email 12": {
    entityIds: ["baxter-eleanor-004", "west-josephine-126"],
    time: new Date(2025, 7, 14, 16, 7),
  },
  "email 13": {
    entityIds: ["west-josephine-126", "roberts-nathaniel-023"],
    time: new Date(2025, 7, 14, 17, 42),
  },
};
<!doctype html>
<html>
  <head>
    <link rel="stylesheet" href="@ci/theme/kg/css/examples.css" />
  </head>
  <body>
    <div id="my-timeline" style="height: 100vh"></div>
    <script type="module" src="./code.jsx"></script>
  </body>
</html>

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