Can we have a `level` in the children?

[SvenDowideit]

I just wanted to do some conditional rendering of the child based on the heading level, and was surprised there wasn't some magic for me - so I used a State

I wonder if there's a better way, or if not, that it might be documented for future users :)

  const [levelNumber, setLevelNumber] = useState(1);

return (
      <Section
        component={
          <H
            render={({ level, Component }) => (
              setLevelNumber(level), (<Component className={`font-bold ${headingLevelClasses[level]} ${className}`}>{heading}</Component>)
            )}
          />
        }
      >
        {levelNumber == 1 && (
          <div>
            <HelpLink className="mr-2" helpUrl={helpUrl} />
          </div>
        )}
        <div className="col-span-2">{children}</div>
      </Section>
);

[alexnault]

Hi Sven, thanks for the question!

The current solution is to use the useLevel hook. Something along those lines:

function Parent() {
  return (
    <Section
      component={
        <H
          render={({ level, Component }) => (
            <Component
              className={`font-bold ${headingLevelClasses[level]} ${className}`}
            >
              {heading}
            </Component>
          )}
        />
      }
    >
      <Child />
      <div className="col-span-2">{children}</div>
    </Section>
  );
}

function Child() {
  const { level } = useLevel(); // level is 1 level deeper than parent now

  if (level !== 1) {
    return null;
  }

  return (
    <div>
      <HelpLink className="mr-2" helpUrl={helpUrl} />
    </div>
  );
}

Another solution would be for react-headings to support children as a render prop, but that would make it harder to read then it already is imo. Food for thought.

Cheers!

[SvenDowideit]

mmm, so, your comment const { level } = useLevel(); // level is 1 level deeper than parent now is interesting - what i'm experiencing, is that it's a H1 header, but in the child, level == 2 - I'm assuming that your example should just change the if, reasonable, but it does lead to some harder to read code