# Time Header Bubble (JavaScript Scheduler) | DayPilot Pro for JavaScript Demo

> Hover over a time header to see a bubble with the date. The contents of the [time header bubble](https://doc.daypilot.org/scheduler/time-header-bubble/) can be defined statically or generated dynamically in the onLoad handler.

## Links

- Canonical HTML: /demo/scheduler/timeheaderbubble.html
- Source HTML folder: /demo/scheduler/
- Catalog root: /demo/
- Catalog: /demo/llms.txt

## Source

### Inline demo script 1

```javascript
const dp = new DayPilot.Scheduler("dp", {
            startDate: "2026-04-01",
            days: 365,
            scale: "Day",
            timeHeaders: [
                {groupBy: "Month", format: "MMMM yyyy"},
                {groupBy: "Day", format: "d"}
            ],
            treeEnabled: true,
            heightSpec: "Max",
            height: 400,
            onTimeRangeSelected: async (args) => {
                const modal = await DayPilot.Modal.prompt("New event name:", "New Event")
                dp.clearSelection();
                if (modal.canceled) {
                    return;
                }
                const name = modal.result;
                dp.events.add({
                    start: args.start,
                    end: args.end,
                    id: DayPilot.guid(),
                    resource: args.resource,
                    text: name
                });
                dp.message("Created");
            },
            timeHeaderBubble: new DayPilot.Bubble({
                onLoad: (args) => {
                    const p = args.source;
                    const date = p.start.toString("M/d/yyyy");
                    args.html = `<div>${date}</div>`;
                }
            })
        });

        dp.init();
        dp.scrollTo("2026-04-01");

        const app = {
            barColor(i) {
                const colors = ["#3c78d8", "#6aa84f", "#f1c232", "#cc0000"];
                return colors[i % 4];
            },
            barBackColor(i) {
                const colors = ["#a4c2f4", "#b6d7a8", "#ffe599", "#ea9999"];
                return colors[i % 4];
            },
            loadData() {
                const resources = [
                    {
                        name: "Locations", id: "G1", expanded: true, children: [
                            {name: "Room 1", id: "A"},
                            {name: "Room 2", id: "B"},
                            {name: "Room 3", id: "C"},
                            {name: "Room 4", id: "D"},
                        ]
                    },
                    {
                        name: "People", id: "G2", expanded: true, children: [
                            {name: "Person 1", id: "E"},
                            {name: "Person 2", id: "F"},
                            {name: "Person 3", id: "G"},
                            {name: "Person 4", id: "H"}
                        ]
                    },
                    {
                        name: "Tools", id: "G3", expanded: true, children: [
                            {name: "Tool 1", id: "I"},
                            {name: "Tool 2", id: "J"},
                            {name: "Tool 3", id: "K"},
                            {name: "Tool 4", id: "L"}
                        ]
                    },
                    {
                        name: "Other Resources", id: "G4", expanded: true, children: [
                            {name: "Resource 1", id: "R1"},
                            {name: "Resource 2", id: "R2"},
                            {name: "Resource 3", id: "R3"},
                            {name: "Resource 4", id: "R4"}
                        ]
                    },
                ];

                const events = [];
                for (let i = 0; i < 12; i++) {
                    const duration = Math.floor(Math.random() * 6) + 1; // 1 to 6
                    const durationDays = Math.floor(Math.random() * 6) + 1; // 1 to 6
                    const start = Math.floor(Math.random() * 6) + 2; // 2 to 7

                    const e = {
                        start: new DayPilot.Date("2026-04-05T12:00:00").addDays(start),
                        end: new DayPilot.Date("2026-04-05T12:00:00").addDays(start).addDays(durationDays).addHours(duration),
                        id: i + 1,
                        resource: String.fromCharCode(65 + i),
                        text: "Event " + (i + 1),
                        bubbleHtml: "Event " + (i + 1),
                        barColor: app.barColor(i),
                        barBackColor: app.barBackColor(i)
                    };

                    events.push(e);
                }

                dp.update({resources, events});
            },
        };

        app.loadData();
```