Render/overwrite content anywhere in your application.

haxelib install react-portal 1.0.0


React Portal

Render/overwrite content anywhere in your application.


This library was created to cover limitations from existing solutions (ReactDOM.createPortal(...), mui.core.Portal from material-ui):

  • Target container needed to be mounted before the content being sent there, which was sometimes a pain with DOM containers or contextual containers (inside drawers, etc.)

  • No built-in way to have multiple content providers writing to the same container (and taking priority over one another)



This library is using some features of Haxe 4, and is not currently compatible with 3.x. Compatibility could be achieved, but I have no use for it so I don't bother. Feel free to express your need for it.

React 16.3.0 is needed because this library is using the "new context API".

As for haxe-react, this library is primarily developed for react-next, with any reasonably recent version. Compatibility with coconut.react should be possible but is not tested, feel free to open issues or pull requests if needed.

Basic usage

First, you need a react.portal.PortalProvider near the root of your component tree (or at least above any of your portals):

  {/* component tree */}

Then, somewhere in your component tree you can define where to render your content with react.portal.PortalContainer:

    <PortalContainer id="custom-title" />
    <PortalContainer id="custom-nav" />

You can then write to those from anywhere in your component tree. Note that the containers don't even need to exist yet when you send your content, they will get it when they are displayed (you can have portals in mobile drawers, etc.).

To write content, use react.portal.PortalContent:

<PortalContent target="custom-title">
  Hello world!

Note: consider using abstracts over String for your target ids.


Sometimes you want a container to have contextual content. Several content providers can target the same container by using priorities.

You can define your absolute fallback with priority Insignificant (or any other low priority, see below):

<PortalContent target="custom-title" priority={Insignificant}>
  My application

But then, on your task list, you want to set it to:

<PortalContent target="custom-title" priority={Average}>
  TODO list

And when inserting a new one:

<PortalContent target="custom-title" priority={High}>
  TODO list: new task

When those PortalContent components will unmount, the highest priority amongst remaining defined content will be displayed again.

Available priorities are, from lowest to highest:

  • Insignificant
  • Lowest
  • Lower
  • Low
  • BelowAverage
  • Average
  • AboveAverage
  • High
  • Higher
  • Highest
  • Ultimate

Current limitations

Both of these should be handled in a future release, but are not considered deal breakers at the moment:

  • You cannot explicitly set content to null for a specific priority (and so overriding a lower priority which has content). There is a simple workaround though: pass <></> (empty react.Fragment) instead.

  • Multiple components writing to the same priority of the same target can conflict with each other: if both write content and then one of them discards it (either by setting to null or unmounting), the content will not fall back to the other one until it is rendered again. Workaround: use different priorities when possible.