# Auto Cell Width (JavaScript Scheduler) | DayPilot Pro for JavaScript Demo

> The cell width is calculated automatically to match the Scheduler width (cellWidth: "Auto"). This option prevents the horizontal scrollbar from appearing. Read more about the [auto cell width](https://doc.daypilot.org/scheduler/auto-cell-width/).

## Links

- Canonical HTML: /demo/scheduler/autocellwidth.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", {
            cellWidthSpec: 'Auto',
            cellWidthMin: 20,
            startDate: "2026-03-01",
            days: 31,
            scale: "Day",
            timeHeaders: [
                {groupBy: "Month", format: "MMMM yyyy"},
                {groupBy: "Cell", format: "d"}
            ],
            resources: [
                {name: "Room A", id: "A"},
                {name: "Room B", id: "B"},
                {name: "Room C", id: "C"},
                {name: "Room D", id: "D"},
                {name: "Room E", id: "E"},
                {name: "Room F", id: "F"},
                {name: "Room G", id: "G"},
                {name: "Room H", id: "H"},
                {name: "Room I", id: "I"},
                {name: "Room J", id: "J"},
            ],
            onTimeRangeSelected: async args => {
                const modal = await DayPilot.Modal.prompt("New event name:", "Event");
                dp.clearSelection();
                if (modal.canceled) return;
                dp.events.add({
                    start: args.start,
                    end: args.end,
                    id: DayPilot.guid(),
                    resource: args.resource,
                    text: modal.result
                });
                dp.message("Created");
            }
        });
        dp.init();

        const app = {
            init() {
                this.loadEventData();
            },
            loadEventData() {
                // generate and load events
                const events = [];

                for (let i = 0; i < 10; i++) {
                    const duration = Math.floor(Math.random() * 6) + 1; // 1 to 6
                    const start = Math.floor(Math.random() * 6) - 3; // -3 to 3

                    const event = {
                        start: new DayPilot.Date("2026-03-05T00:00:00").addDays(start),
                        end: new DayPilot.Date("2026-03-05T12:00:00").addDays(start).addDays(duration),
                        id: DayPilot.guid(),
                        resource: String.fromCharCode(65 + i),
                        text: "Event"
                    };

                    events.push(event);
                }
                dp.update({events});

            }
        };
        app.init();
```