Exceptions indicated.
com.fulcrologic.fulcro.react.error-boundaries
A macro and predefined component that can create a boundary above which errors cannot propagate. Read the docstring
of error-boundary carefully. Works with server-side rendering as well, and provides for development-time retries
to recover after a hot code reload without having to reload the entire page.
A macro and predefined component that can create a boundary above which errors cannot propagate. Read the docstring of `error-boundary` carefully. Works with server-side rendering as well, and provides for development-time retries to recover after a hot code reload without having to reload the entire page.
*render-error*clj/s
A (fn [react-element exception] what-to-render). Called in order to render an alternate for UI segments that have crashed.
Defaults to a simple div containing the error header and message as standard HTML elements.
A `(fn [react-element exception] what-to-render)`. Called in order to render an alternate for UI segments that have crashed. Defaults to a simple div containing the error header and message as standard HTML elements.
error-boundaryclj/smacro
(error-boundary & body)Wraps the given children in a nested pair of stateless elements that prevent unexpected exceptions from propagating up the UI tree. Any unexpected rendering or lifecycle errors that happen will be caught and cause an error message to be shown in place of the children.
The error boundary rendering is very very simple by default. A simple message that says there was an error. This is partially because you will always probably want to customize it, and also so there are no dependencies on DOM so that this macro is usable in Native, where there is no DOM.
You can clear an error with component local state (see example below), but unless the problem has been corrected it will just fail again. Therefore, clearing the error is probably not useful except during development when a hot code reload could actually fix the problem.
You can also completely take over the error boundary rendering by binding or by setting to root binding of render-error
via set! in cljs, and alter-var-root in Clojure.
For example, in cljs you would add something like this in your entry point:
(ns ...
(:require
[com.fulcrologic.fulcro.react.error-boundaries :as eb]))
...
(defn start []
(set! eb/*render-error*
(fn [this cause]
(dom/div
(dom/h2 :.header " Unexpected Error ")
(dom/p "An error occurred while rendering the user interface. ")
(dom/p (str cause))
(when #?(:clj false :cljs goog.DEBUG)
(dom/button {:onClick (fn []
(comp/set-state! this {:error false
:cause nil}))} " Dev Mode: Retry rendering "))))))
Wraps the given children in a nested pair of stateless elements that prevent unexpected exceptions from
propagating up the UI tree. Any unexpected rendering or lifecycle errors that happen will be
caught and cause an error message to be shown in place of the children.
The error boundary rendering is very very simple by default. A simple message that says there was an error. This
is partially because you will always probably want to customize it, and also so there are no dependencies on DOM
so that this macro is usable in Native, where there is no DOM.
You can clear an error with component local state (see example below), but unless the problem has been corrected
it will just fail again. Therefore, clearing the error is probably not useful except during development when a hot
code reload could actually fix the problem.
You can also completely take over the error boundary rendering by `binding` or by setting to root binding of *render-error*
via `set!` in cljs, and `alter-var-root` in Clojure.
For example, in cljs you would add something like this in your entry point:
```
(ns ...
(:require
[com.fulcrologic.fulcro.react.error-boundaries :as eb]))
...
(defn start []
(set! eb/*render-error*
(fn [this cause]
(dom/div
(dom/h2 :.header " Unexpected Error ")
(dom/p "An error occurred while rendering the user interface. ")
(dom/p (str cause))
(when #?(:clj false :cljs goog.DEBUG)
(dom/button {:onClick (fn []
(comp/set-state! this {:error false
:cause nil}))} " Dev Mode: Retry rendering "))))))
```
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