modal
Complete guide to implementing modals in the finstreet context. Covers the store, modal component, and optional open button. Use when building or modifying any modal.
What this skill does
# Modal — Complete Guide
Every modal consists of up to three files:
1. **Store** — Zustand store to control open state and typed data
2. **Modal** — The modal UI component
3. **Open Button** — *(optional)* Only create this when explicitly requested
## Path Resolution
Before creating any files, invoke the `finstreet-fe:path-resolver` skill with your input parameters (featureName, subFeatureName, featureType, product, role) to resolve the correct paths. Use the returned **Feature Path** as `{parentDirectory}` in the directory structure below.
## Directory Structure
```
{parentDirectory}/
├── store.ts
├── {ModalName}Modal.tsx
└── Open{ModalName}ModalButton.tsx ← only if requested
```
## 1. Store
File: `store.ts`
```typescript
import { create } from "zustand";
type {ModalName}ModalData = {
financingCaseId: string;
} | null;
interface {ModalName}ModalStore {
isOpen: boolean;
data: {ModalName}ModalData;
setIsOpen: (isOpen: boolean) => void;
setData: (data: {ModalName}ModalData) => void;
}
export const use{ModalName}Modal = create<{ModalName}ModalStore>((set) => ({
isOpen: false,
data: null,
setIsOpen: (isOpen) => set({ isOpen }),
setData: (data) => set({ data, isOpen: true }),
}));
```
- `data` holds the typed payload the modal needs (e.g., IDs passed from the trigger)
- `setData` always sets `isOpen: true` — opening and setting data happen together
- Shape the `{ModalName}ModalData` type to match exactly what the modal content needs
## 2. Modal Component
File: `{ModalName}Modal.tsx`
```tsx
"use client";
import {
Modal,
ModalContent,
ModalTitle,
} from "@finstreet/ui/components/patterns/Modal";
import { use{ModalName}Modal } from "./store";
import { Suspense } from "react";
import { useExtracted } from "next-intl";
import { Headline } from "@finstreet/ui/components/base/Headline";
import { Typography } from "@finstreet/ui/components/base/Typography";
import { VStack } from "@styled-system/jsx";
export const {ModalName}Modal = () => {
const { isOpen, data, setIsOpen } = use{ModalName}Modal();
const t = useExtracted();
if (!data) {
return null;
}
const { financingCaseId } = data;
return (
<Modal open={isOpen} onClose={() => setIsOpen(false)}>
<ModalTitle>
{/* See title patterns below */}
</ModalTitle>
<ModalContent>
{/* Modal content here */}
</ModalContent>
</Modal>
);
};
```
### ModalTitle variants
Use exactly one of these based on whether a subheading is present in the context:
**With title and subheading:**
```tsx
<ModalTitle>
<VStack gap={1} alignItems={"flex-start"}>
<Headline>{t("{German title}")}</Headline>
<Typography color={"text.dark"}>{t("{German subheading}")}</Typography>
</VStack>
</ModalTitle>
```
**Title only (no subheading):**
```tsx
<ModalTitle>
{t("{German title}")}
</ModalTitle>
```
### Rules
- Always guard with `if (!data) return null` before destructuring data
- Wrap async content (e.g., forms with server actions) in `<Suspense>`
- Hardcoded strings are acceptable — translations are cleaned up separately
## 3. Open Button *(optional)*
File: `Open{ModalName}ModalButton.tsx`
**Only create this file when explicitly asked to.**
```tsx
"use client";
import { use{ModalName}Modal } from "./store";
import { Button } from "@finstreet/ui/components/base/Button";
import { useExtracted } from "next-intl";
type Open{ModalName}ModalButtonProps = {
financingCaseId: string;
};
export const Open{ModalName}ModalButton = ({
financingCaseId,
}: Open{ModalName}ModalButtonProps) => {
const { setData } = use{ModalName}Modal();
const t = useExtracted();
return (
<Button onClick={() => setData({ financingCaseId })}>
{t("{German button label}")}
</Button>
);
};
```
- Call `setData` (not `setIsOpen`) from the button — `setData` already opens the modal
- Props must match the `{ModalName}ModalData` type from the store
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