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Build a marina slip map by drawing ordinary SVG shapes from a data array, then use React state to track the selected slip and show its details in a nearby panel. React supports SVG elements directly in JSX, so a basic select-and-inspect map needs no map SDK or diagramming library. The sample below demonstrates the interaction, not a surveyed marina plan or live availability system.
Separate map geometry from slip information
Keep each slip’s position and dimensions in SVG coordinate units, and keep its identifying facts and status in JavaScript data. The coordinate values below are illustrative; replace them with geometry derived from the marina’s authoritative plan. Ask the marina or project owner for the plan, coordinate system, inventory, stable slip identifiers, labels, and status rules.
React’s built-in SVG support allows elements such as <svg>, <rect>, and <text> in JSX. See React DOM Components. A viewBox establishes the internal coordinate space used by the shapes; the example does not claim that its dimensions or layout match a real marina.
The Tool Desk
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{ id: "A-01", label: "Slip A-01", x: 40, y: 50, width: 24, height: 70, status: "Available" },
{ id: "A-02", label: "Slip A-02", x: 70, y: 50, width: 24, height: 70, status: "Occupied" },
{ id: "A-03", label: "Slip A-03", x: 100, y: 50, width: 24, height: 70, status: "Unavailable" }
];The fields are a suggested shape for application data, not a marina standard. Prefer stable marina-provided IDs over labels that might change. Keep status vocabulary aligned with the system that owns the information.
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Render the slips and store the selected ID
Store the selected slip ID in React state. Map over the records to render one SVG group per slip, use the stable ID as the React key, and derive the visual selection from that ID. React’s event guidance explains that state holds changing component information and that JSX receives handler functions; its list guidance explains why each sibling needs a unique key. See Responding to Events and Quick Start.
import { useState } from "react";
const slips = [
{ id: "A-01", label: "Slip A-01", x: 40, y: 50, width: 24, height: 70, status: "Available" },
{ id: "A-02", label: "Slip A-02", x: 70, y: 50, width: 24, height: 70, status: "Occupied" },
{ id: "A-03", label: "Slip A-03", x: 100, y: 50, width: 24, height: 70, status: "Unavailable" }
];
export default function MarinaMap() {
const [selectedSlipId, setSelectedSlipId] = useState(null);
const selectedSlip = slips.find((slip) => slip.id === selectedSlipId);
return (
<section>
<svg viewBox="0 0 160 180" role="img" aria-labelledby="map-title">
<title id="map-title">Marina slip map</title>
<rect x="25" y="35" width="110" height="100" fill="#d9eff5" />
{slips.map((slip) => {
const selected = slip.id === selectedSlipId;
return (
<g key={slip.id} onClick={() => setSelectedSlipId(slip.id)}>
<rect
x={slip.x}
y={slip.y}
width={slip.width}
height={slip.height}
fill={selected ? "#ffd166" : slip.status === "Available" ? "#b7e4c7" : "#d3d3d3"}
stroke={selected ? "#111" : "#355"}
strokeWidth={selected ? 3 : 1}
/>
<text x={slip.x + 3} y={slip.y + 16} fontSize="8">{slip.id}</text>
</g>
);
})}
</svg>
<div aria-live="polite">
{selectedSlip ? (
<p>{selectedSlip.label}: {selectedSlip.status}</p>
) : (
<p>Select a slip to see its details.</p>
)}
</div>
</section>
);
}The event prop receives a function, () => setSelectedSlipId(slip.id), rather than a function call made during rendering. Here, selection changes the panel text and highlight; it does not reserve a slip or change the underlying status.
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Make small slip shapes practical to select
SVG pointer hit-testing targets the topmost eligible graphic beneath the pointer. The SVG 2 specification describes how hit-testing determines a pointer-event target, while the pointer-events property controls which painted or geometric areas can receive events. See W3C SVG 2: Scripting and Interactivity.
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- Check the stacking order: an eligible shape drawn later or placed above another may receive the pointer event instead.
- Use
pointer-eventsdeliberately for decorative shapes or overlays that should not intercept selection. - Do not assume that a visually transparent target is inaccessible simply because it is invisible. The SVG Accessibility API Mappings 1.0 Working Draft dated May 20, 2026 discusses large invisible targets in maps and charts and says they should also be perceivable and interactive to assistive-technology users.
Provide a keyboard-accessible way to choose slips
A click handler alone does not make an SVG group a complete keyboard control. SVG 2 cautions authors not to rely on browsers automatically making elements with pointer or focus listeners focusable, and says interactive elements should directly support keyboard interaction. A straightforward approach is to provide a companion HTML button for each slip and use the same state for the map and the list.
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<ul>
{slips.map((slip) => (
<li key={slip.id}>
<button
type="button"
aria-pressed={selectedSlipId === slip.id}
onClick={() => setSelectedSlipId(slip.id)}
>
{slip.label} — {slip.status}
</button>
</li>
))}
</ul>HTML buttons provide built-in keyboard navigation and activation. React’s event guide recommends using appropriate HTML tags for event handlers, including a semantic button for an action: Responding to Events. Keep the list and SVG synchronized through the same selected ID so people can locate a slip without relying on the map alone.
If the SVG shapes themselves must be the only controls, implement and test their focus order, keyboard activation, accessible names, and visible focus styling across the browsers and assistive technologies the project supports. SVG 2 calls for keyboard interaction and visible indication of focus; do not assume that attaching a listener supplies either.
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Show status without relying on color
The example uses color to distinguish statuses and selection, but color should not be the only signal. Show readable slip labels and status text in the details panel or companion list, and use additional visual cues such as an outline, pattern, or symbol where useful. Confirm with the marina which status terms to use and which system is authoritative; the example’s data is static and does not establish current availability.
Choose the right scope for the first version
A select-and-inspect map is a useful first slice because it exercises layout, hit-testing, and state without implying a reservation workflow. Before expanding it, settle the project decisions that affect correctness:
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- Plan fidelity: identify the authoritative marina plan, its coordinate system and scale, and how plan changes reach the map. Hand-entered coordinates are simple, but they are not a substitute for surveyed or otherwise validated geometry.
- Slip identity: confirm which slips exist and which stable ID and user-facing label should appear for each.
- Interaction scope: decide whether users only inspect and select slips or can also reserve them, see pricing, or trigger another action.
- Status ownership: identify the system that supplies status and how fresh the displayed value must be. Do not call availability live unless the map is connected to an authoritative source with a defined update path.
- Supported use: specify target browsers, screen sizes, input methods, and assistive technologies, then test the map and its companion controls against them.
For a fixed map, SVG coordinates can directly express each shape’s location and size. If the geometry comes from a surveyed or CAD plan, define how that source is transformed into the SVG coordinate space rather than assuming the example’s coordinates apply. Responsive sizing, aspect-ratio behavior, panning, zooming, and converting pointer coordinates should be prototyped against the actual layout and interaction needs.
Quick Recap
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