Cookbook

The Yesod Cookbook

The Yesod Cookbook contains small snippets of code for solving practical problems with Yesod. If you have some code to share, please create a wiki page and link to it in the appropriate section.

For non-Yesod code, see also Snippets.

Basics

• Adding CSS and JS
• JSON Object Create and Append

Forms

• Change the order of form fields
• Require input for Maybe field
• Custom form layout
• Password confirm field
• Multi-field validation
• Select field populated from database
• Multi-select field populated from database
• Multi-select field populated from database (esqueleto) - this is the optimized version
• File upload
• File upload saving files to server

Persistence

• Run raw MongoDB
• Run raw SQL
• Sphinx Search
• Non scaffolded MongoDB App

State

• Keeping (in-memory) state with warp
• Keeping (in-memory) state with yesod

HTML5 and Yesod

• Basic ServerEvent example

Auth

• Use HashDB in a scaffolded site

Internationalization

• Internationalization of forms

Routing

• Hierarchical routes and breadcrumbs
• Domain-based routing
• subdomain (www) redirect
• Static file subsite Hello World
• Pure-Haskell static subdomains
• Slugs
• Using type-safe URLs from inside Javascript

Template Haskell

• Creating string based enums using Template Haskell

Conduit

• Consume a webpage with http-conduit and print progress along the way