Theo's Typesafe Cult•4mo ago

What's the idiomatic way to enable/disable a button based on Zod results?

Hi, New to React, not really a frontend developer. I want to disable my button if my Zod schema doesn't like the field value. Ideally without adding a redundant useState to track whether the field is valid. In the example below, I can use disabled = (nextItem === ''), but that pattern won't scale to more complex validations (I assume). I'm used to rxjs from Angular-land, I assume there's a reactive approach here as well. Or am I totally off-base?

function RapidEntryList () {
  const [items, setItems] = useState([] as string[]);
  const [nextItem, setNextItem] = useState<string>('');

  function addItem(item: string): () => boolean {
      return () => {
          const copy = items.slice();
          copy.push(item);
          setItems(copy);
          return false;
      }
  }

  function inputChange(newValue: string) {
      const result = itemName.safeParse(newValue);
      setNextItem(result.success ? result.data : '');
  }

  const itemName: ZodString = z.string().trim().min(1).max(maxTaskNameLength);


  return (<div>
    <div className="join join-vertical">
      {items.map((str, i) => <p key={i} className="join-item">{str}</p>)}
    </div>
    <input type="text" onChange={e => inputChange(e.target.value)}
           placeholder="Start entering your items" className="input w-full max-w-xs"/>
    <button className="btn" disabled={/* what goes here??? */false} onClick={addItem(nextItem)}>Add</button>
  </div>)
}

function RapidEntryList () {
  const [items, setItems] = useState([] as string[]);
  const [nextItem, setNextItem] = useState<string>('');

  function addItem(item: string): () => boolean {
      return () => {
          const copy = items.slice();
          copy.push(item);
          setItems(copy);
          return false;
      }
  }

  function inputChange(newValue: string) {
      const result = itemName.safeParse(newValue);
      setNextItem(result.success ? result.data : '');
  }

  const itemName: ZodString = z.string().trim().min(1).max(maxTaskNameLength);


  return (<div>
    <div className="join join-vertical">
      {items.map((str, i) => <p key={i} className="join-item">{str}</p>)}
    </div>
    <input type="text" onChange={e => inputChange(e.target.value)}
           placeholder="Start entering your items" className="input w-full max-w-xs"/>
    <button className="btn" disabled={/* what goes here??? */false} onClick={addItem(nextItem)}>Add</button>
  </div>)
}

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What's the idiomatic way to enable/disable a button based on Zod results?