How does render_async compare to Turbo Frames in Rails?

render_async is a lightweight, AJAX-based gem for async partials, ideal for dropping into existing Rails apps. Turbo Frames are part of Hotwire for more integrated, real-time page updates, but require a steeper learning curve and different architecture.

How to handle errors when using render_async?

Configure error_message for custom display or error_event_name to trigger JavaScript events on failure. The README shows examples with retry logic and event listeners for robust error management.

Can render_async work with Rails 7 and Hotwire?

Yes, it's compatible with Turbo, Hotwire's core component. Enable the turbo configuration option to avoid caching issues, as detailed in the README's Turbo support section.

How to implement polling for real-time updates?

Pass the interval argument to render_async, e.g., interval: 5000 for updates every 5 seconds. The README also covers controlled polling with toggle events for more dynamic control.

Is render_async good for SEO?

No, async-loaded content via AJAX may not be indexed immediately by search engines. It's best for non-critical or dynamic sections where SEO is less important, like admin dashboards.

How to cache async partials with render_async?

Use render_async_cache instead of render_async and set up fragment caching in the partial with cache keys. The README provides an example using skip_digest to avoid redundant AJAX calls.

render_async — Async Rails Partial Rendering

What is render_async?

render_async is a Ruby on Rails gem that allows developers to load parts of a web page asynchronously via AJAX. It solves the problem of slow page loads by deferring the rendering of non-essential or resource-intensive partials, so users see the main content faster. The gem integrates seamlessly with Rails' view helpers and routing system.

Target Audience

Rails developers looking to improve frontend performance without moving to a full single-page application architecture. It's ideal for teams maintaining server-rendered Rails apps who want faster perceived load times.

Value Proposition

Developers choose render_async because it provides a simple, Rails-native way to implement asynchronous rendering without complex JavaScript frameworks. Its minimal configuration and compatibility with Rails tools like Turbolinks and caching make it a lightweight performance booster.

render_async lets you include pages asynchronously with AJAX

Use Cases

Best For

Speeding up initial page loads in server-rendered Rails applications
Deferring slow database queries or external API calls in partials
Implementing real-time content updates without full page refreshes
Adding polling or toggle-based dynamic content sections
Improving perceived performance for content-heavy admin dashboards
Integrating asynchronous sections in legacy Rails apps with minimal changes

Not Ideal For

Single-page applications built with JavaScript frameworks like React or Vue, where full client-side rendering is the goal
Projects requiring real-time updates via WebSockets without polling latency
Teams enforcing strict Content Security Policies that prohibit inline JavaScript injection

Pros & Cons

Pros

Seamless Rails Integration

Uses Rails view helpers and routing out of the box, allowing async partials with minimal code changes, as demonstrated in the basic usage example with render_async helper and controller actions.

Flexible Configuration Options

Supports container IDs, classes, placeholders, event-driven updates, and polling, detailed in advanced usage sections for fine-grained control over async rendering.

Robust Error Handling

Includes configurable error messages, retry counts, and delays for reliable AJAX requests, evidenced by the retry on failure and error event options in the README.

Caching for Performance

Integrates with Rails fragment caching via render_async_cache to avoid redundant calls, improving efficiency as shown in the caching section with cache keys.

Cons

JavaScript Injection Requirement

Must inject JavaScript via content_for in the layout, which can conflict with Content Security Policies or teams preferring zero-JavaScript solutions.

Polling Overhead and Latency

Relies on AJAX polling for dynamic updates, which can cause unnecessary server load and slower real-time responses compared to WebSockets or SSE.

Turbolinks/Turbo Configuration Hurdles

The README admits caching issues with Turbolinks and Turbo if not configured correctly, leading to empty divs and requiring extra setup steps.

What is render_async?

Target Audience

Value Proposition

Use Cases

Best For

Speeding up initial page loads in server-rendered Rails applications
Deferring slow database queries or external API calls in partials
Implementing real-time content updates without full page refreshes
Adding polling or toggle-based dynamic content sections
Improving perceived performance for content-heavy admin dashboards
Integrating asynchronous sections in legacy Rails apps with minimal changes

Not Ideal For

Single-page applications built with JavaScript frameworks like React or Vue, where full client-side rendering is the goal
Projects requiring real-time updates via WebSockets without polling latency
Teams enforcing strict Content Security Policies that prohibit inline JavaScript injection

Pros & Cons

Pros

Seamless Rails Integration

Uses Rails view helpers and routing out of the box, allowing async partials with minimal code changes, as demonstrated in the basic usage example with render_async helper and controller actions.

Flexible Configuration Options

Supports container IDs, classes, placeholders, event-driven updates, and polling, detailed in advanced usage sections for fine-grained control over async rendering.

Robust Error Handling

Includes configurable error messages, retry counts, and delays for reliable AJAX requests, evidenced by the retry on failure and error event options in the README.

Caching for Performance

Integrates with Rails fragment caching via render_async_cache to avoid redundant calls, improving efficiency as shown in the caching section with cache keys.

Cons

JavaScript Injection Requirement

Must inject JavaScript via content_for in the layout, which can conflict with Content Security Policies or teams preferring zero-JavaScript solutions.

Polling Overhead and Latency

Relies on AJAX polling for dynamic updates, which can cause unnecessary server load and slower real-time responses compared to WebSockets or SSE.

Turbolinks/Turbo Configuration Hurdles

The README admits caching issues with Turbolinks and Turbo if not configured correctly, leading to empty divs and requiring extra setup steps.

render_async

What is render_async?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

render_async

What is render_async?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?