brotherton-erpnext/erpnext/public/js/utils/demo.js

$(document).on("toolbar_setup", function () {
	if (frappe.boot.sysdefaults.demo_company) {
		render_clear_demo_button();
	}

	// for first load after setup.
	frappe.realtime.on("demo_data_complete", () => {
		render_clear_demo_button();
	});
});

function render_clear_demo_button() {
	let wait_for_onboaring_tours = setInterval(() => {
		if ($("#driver-page-overlay").length) {
			return;
		}
		setup_clear_demo_button();
		clearInterval(wait_for_onboaring_tours);
	}, 2000);
}

function setup_clear_demo_button() {
	let message_string = __(
		"Demo data is present on the system, erase data before starting real usage."
	);
	let $floatingBar = $(`
		<div class="flex justify-content-center" style="width: 100%;">
			<div class="flex justify-content-center flex-col shadow rounded p-2"
					style="
						background-color: #e0f2fe;
						position: fixed;
						bottom: 20px;
						z-index: 1;">
			<p style="margin: auto 0; padding-left: 10px; margin-right: 20px; font-size: 15px;">
					${message_string}
				</p>
				<button id="clear-demo" type="button"
					class="
						px-4
						py-2
						border
						border-transparent
						text-white
					"
					style="
						margin: auto 0;
						height: fit-content;
						background-color: #007bff;
						border-radius: 5px;
						margin-right: 10px
					"
				>
					Clear Demo Data
				</button>

	 			<a type="button" id="dismiss-demo-banner" class="text-muted" style="align-self: center">
					<svg class="icon" style="">
						<use class="" href="#icon-close"></use>
					</svg>
				</a>
			</div>
		</div>
	`);

	$("footer").append($floatingBar);

	$("#clear-demo").on("click", function () {
		frappe.confirm(
			__("Are you sure you want to clear all demo data?"),
			() => {
				frappe.call({
					method: "erpnext.setup.demo.clear_demo_data",
					freeze: true,
					freeze_message: __("Clearing Demo Data..."),
					callback: function (r) {
						frappe.ui.toolbar.clear_cache();
						frappe.show_alert({
							message: __("Demo data cleared"),
							indicator: "green",
						});
						$("footer").remove($floatingBar);
					},
				});
			}
		);
	});

	$("#dismiss-demo-banner").on("click", function () {
		$floatingBar.remove();
	});
}