SolidJS•15mo ago

Forward ref downstream

How can I forward a HTMLElement reference to a downstream component? i.e:

<div ref={theDiv}>
  <MyComponent refToTheDiv={theDiv}/>
</div>

<div ref={theDiv}>
  <MyComponent refToTheDiv={theDiv}/>
</div>

so that I can use the div inside of MyComponent

5 Replies

fabiospampinato•15mo ago

refs only make sense in general if they are signals, so you can make a signal and then just pass the setter to ref={} and the getter to refToTheDiv={}

Deflaktor•15mo ago

So I can just do

const [theDiv, setTheDiv] = createSignal(null);

return (
  <div ref={setTheDiv}>
    <MyComponent refToTheDiv={theDiv} />
  </div>
);

const [theDiv, setTheDiv] = createSignal(null);

return (
  <div ref={setTheDiv}>
    <MyComponent refToTheDiv={theDiv} />
  </div>
);

? Ok yeah that seems to work. Kinda difficult for me to wrap my head around how that signal setter works in all kinds of contexts.

fabiospampinato•15mo ago

once the code is compiled a ref is always a function that is called with an element in this case you are giving it the setter, so that's called with the element, so that becomes the value of the signal

Deflaktor•15mo ago

Thanks for the explanation. On one hand it is a genius solution by the framework, on the other hand (for me as a beginner) it seems like some magic is happening behind the scenes.

fabiospampinato•15mo ago

If you just use a variable and not a signal there's some magic that's happening behind the scenes, that's part of how Solid works for better or for worse

Gaming

Programming

Forward ref downstream