ErrorHandling.md

Error handling and pages

(coming)

Error handling in parts

Since there are many ways a part can fail, it is wise to do some extra fail handling. In case of an error only the part should fail gracefully, instead of crashing the whole page.

One easy way to assure only the part fails, are to wrap the logic in the controller in a try catch. And have one function that creates the part content and rendering in the try part, and a error rendering function in the catch part.

import { renderError } from '/lib/error/error' 

export function get(req: XP.Request): XP.Response {
  try {
    return renderPart(req)
  } catch (e) {
    return renderError(req, 'Error in part', e)
  }
}

function renderPart(req: XP.Request): XP.Response {

  ... part logic ...
}

Use the renderError function from /bli/error/error to show a generic error view.