Hey there! Let's break down the two approaches for your 6-7 step multi-step form—component destroy/rebuild vs. show/hide—and help you pick the right one based on your needs.

Component Destroy & Rebuild (Your Current Approach) #

Pros #

• Lower memory footprint: You don't keep all step components alive in the DOM or memory at once. This is great if your steps have heavy DOM elements, complex calculations, or third-party widgets that would bloat the page if left hanging around.
• Clean state isolation: Each step starts fresh when initialized. No risk of leftover state from previous visits (like a half-filled input or a selected dropdown) unless you explicitly persist it. Perfect for scenarios where steps need strict resets (e.g., sensitive data entry, steps that depend on real-time backend data).
• Automatic re-validation/data fetching: If a step relies on dynamic data (like fetching available options from an API), switching back will trigger a fresh load, ensuring you always have the latest info.

Cons #

• Potential lag on switches: Destroying and re-mounting complex components can cause noticeable delays, especially on lower-end devices. Users might see a flicker or wait a moment for the step to render.
• Lost unsaved progress: If a user starts filling out a step, switches away, and comes back, their input will be gone unless you add extra logic to persist state (e.g., in a parent component, global state store, or localStorage). This can frustrate users who need to toggle between steps.
• Tricky animations: Smooth transition effects (like sliding steps in/out) are harder to implement because the previous component's DOM is removed. You'd need to work around this with temporary DOM nodes or state-managed animations.

Show/Hide (CSS-Based Toggle) #

Pros #

• Instant, smooth switches: Toggling visibility with CSS (display: none, opacity, or transform) has almost no performance overhead. You can easily add fluid transitions between steps to improve UX.
• Preserved user input: All filled fields, selections, and local component state stay intact when switching steps. Users can bounce back and forth without losing progress—critical for long forms where people might need to correct earlier entries.
• No re-initialization overhead: Components keep their instances alive, so any one-time setup (like initializing a date picker or chart) only happens once, saving processing time.

Cons #

• Higher memory usage: All 6-7 step components and their DOM nodes live in the page even when hidden. If your steps are resource-heavy, this could slow down the page over time, especially on mobile.
• State cleanup headaches: If a step needs to reset when revisited (e.g., a form that should clear after submission), you'll have to manually reset local component state or sync it with a parent/global store. Leftover state can lead to bugs (like showing old error messages).
• Slower initial load: The page has to initialize all step components upfront, which can increase your first contentful paint time. If steps include large assets or API calls, this could make the form feel sluggish to start.

Which Should You Choose? #

Here's how to decide based on your use case:

• Go with destroy/rebuild if: Users will mostly progress linearly (rarely switching back), steps have heavy/resource-intensive logic, or you need strict state isolation (e.g., compliance-sensitive forms). Just make sure to add state persistence for any fields users might need to revisit.
• Go with show/hide if: Users need frequent step toggling, form completion requires reviewing/editing earlier steps, or smooth animations are a key UX priority. Mitigate memory issues by optimizing component logic and avoiding unnecessary heavy elements in hidden steps.

Bonus: Compromise Approach #

If you want the best of both worlds, try lazy loading + cached components:

• Initialize a step component only when the user first visits it.
• When switching away, hide it instead of destroying it.
• This way, you avoid initial load bloat and preserve user progress, while keeping memory usage lower than initializing all steps at once.

内容的提问来源于stack exchange，提问作者Hacker