JavaScript Scheduler Time Header Bubble Hover Callout

The JavaScript Scheduler component can display a callout with additional information when hovering the time header.

This feature is available since version 2025.3.6583.

You can define the bubble using the timeHeaderBubble property.

{
    timeHeaderBubble: new DayPilot.Bubble(),
    // ...
}

The bubble HTML can be defined statically using the onBeforeTimeHeaderRender event handler:

onBeforeTimeHeaderRender: args => {
    args.header.bubbleHtml = args.header.start.toString("M/d/yyyy");
},

You can also define it dynamically right before the bubble shows up, using the onLoad event handler of the DayPilot.Bubble object:

{
    timeHeaderBubble: new DayPilot.Bubble({
        onLoad: (args) => {
            const p = args.source;
            const date = p.start.toString("M/d/yyyy");
            args.html = `<div>${date}</div>`;
        }
    }),
    // ...
}

Demo