Agent-readable demo data

Title
Resource Utilization (JavaScript Scheduler) | DayPilot Pro for JavaScript Demo
Tree
DayPilot JavaScript Demo
Catalog root
Default
Description
The grid cells display peak resource utilization calculated from a custom "percentage" event field. Read more about calculating resource utilization [doc.daypilot.org].

Inline demo script 1

const dp = new DayPilot.Scheduler("dp", {
            startDate: "2026-01-01",
            days: 365,
            scale: "Day",
            timeHeaders: [
                {groupBy: "Month", format: "MMMM yyyy"},
                {groupBy: "Cell", format: "d"}
            ],
            cellWidth: 80,
            eventHeight: 40,
            rowMarginTop: 26,
            beforeCellRenderCaching: false,
            treeEnabled: true,
            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"},
                {name: "Room K", id: "K"},
            ],
            onBeforeCellRender: args => {
                const moreThan = app.moreThan;
                const utilization = args.cell.utilization("percentage");
                const visible = utilization > moreThan;

                if (visible) {
                    const opacity = (utilization / 100) * 0.7 + 0.3;
                    args.cell.areas = [
                        {
                            left: 2,
                            top: 2,
                            right: 2,
                            height: 20,
                            // dark orange
                            backColor: "#6aa84f",
                            fontColor: "white",
                            padding: 2,
                            html: utilization + "%",
                            horizontalAlignment: "center",
                            style: `opacity: ${opacity}; border-radius: 10px;`
                        }
                    ];
                }
            },
            onBeforeEventRender: args => {
                args.e.bubbleHtml = `<div><b>${args.e.text}</b></div><div>Start: ${new DayPilot.Date(args.e.start).toString("M/d/yyyy")}</div>`;
            },
            onEventMoved: args => {
                dp.message(`Moved: ${args.e.text()}`);
            },
            onEventResized: args => {
                dp.message(`Resized: ${args.e.text()}`);
            },
            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");
            },
            onEventClicked: args => {
                alert(`clicked: ${args.e.id()}`);
            },
            onTimeHeaderClick: args => {
                console.log(args.header);
                alert(`clicked: ${args.header.start}`);
            },
            height: 300
        });

        const app = {
            moreThan: 0,
            init() {
                dp.init();
                dp.scrollTo("2026-03-25");

                this.addEventHandlers();
                this.loadEventData();
            },
            loadEventData() {
                const events = [];
                for (let i = 0; i < 15; i++) {
                    const durationDays = Math.floor(Math.random() * 6 + 2); //2 to 7
                    const start = Math.floor(Math.random() * 6) + 2; // 2 to 7
                    const res = Math.floor(Math.random() * 6); // 0 to 5

                    const event = {
                        start: new DayPilot.Date("2026-03-25T00:00:00").addDays(start),
                        end: new DayPilot.Date("2026-03-25T00:00:00").addDays(start).addDays(durationDays),
                        id: DayPilot.guid(),
                        resource: String.fromCharCode(65 + res),
                        percentage: 10 + i,
                        text: (10 + i) + "%",
                        bubbleHtml: "Utilization: " + (10 + i) + "%"
                    };

                    events.push(event);
                }
                dp.update({events});
            },
            addEventHandlers() {
                document.querySelector("#all").addEventListener("click", (ev) => {
                    ev.preventDefault();
                    this.moreThan = 0;
                    dp.update();
                });
                document.querySelector("#over30").addEventListener("click", (ev) => {
                    ev.preventDefault();
                    this.moreThan = 30;
                    dp.update();
                });
                document.querySelector("#over50").addEventListener("click", (ev) => {
                    ev.preventDefault();
                    this.moreThan = 50;
                    dp.update();
                });
            }
        };
        app.init();