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How to send data from a child component to its sibling?

OOoker1/14/2024
I want create an app with two forms, each form in its own component. Users type in form 1, then the data will be passed to component 2. In there it will join the data of what they type in form 2. How can I do this? Below is the code on my machine, taken from the answer from the same question in Stack Overflow. It works when using React on Stackblitz but I don't get why it's not in my machine: index.jsx
import Form1 from "../islands/Form1.tsx";
import Form2 from "../islands/Form2.tsx";
import { Form1Provider } from "../islands/Context.tsx";

function App() {
return (
<Form1Provider>
<Form1 />
<Form2 />
</Form1Provider>
);
}
import Form1 from "../islands/Form1.tsx";
import Form2 from "../islands/Form2.tsx";
import { Form1Provider } from "../islands/Context.tsx";

function App() {
return (
<Form1Provider>
<Form1 />
<Form2 />
</Form1Provider>
);
}
Context.js
import { createContext } from 'preact'
import { useContext, useState } from "preact/hooks";

export const Form1Context = createContext(null);

export function Form1Provider({ children }) {
const form1State = useState('Form 1 placeholder');
return (
<Form1Context.Provider value={form1State}>{children}</Form1Context.Provider>
);
}
import { createContext } from 'preact'
import { useContext, useState } from "preact/hooks";

export const Form1Context = createContext(null);

export function Form1Provider({ children }) {
const form1State = useState('Form 1 placeholder');
return (
<Form1Context.Provider value={form1State}>{children}</Form1Context.Provider>
);
}
Form1.jsx
import { useContext, useState } from "preact/hooks";
import { Form1Context } from './Context.tsx';

export default function Form1() {
const [form1Data, setForm1Data] = useContext(Form1Context)

return (
<textarea
value = {form1Data}
onInput={(event) => setForm1Data(event.target.value)}
/>
);
}
import { useContext, useState } from "preact/hooks";
import { Form1Context } from './Context.tsx';

export default function Form1() {
const [form1Data, setForm1Data] = useContext(Form1Context)

return (
<textarea
value = {form1Data}
onInput={(event) => setForm1Data(event.target.value)}
/>
);
}
Form2.jsx
import { useContext, useState } from "preact/hooks";
import { Form1Context } from './Context.tsx';

export default function Form2() {
const [form1Data, setForm1Data] = useContext(Form1Context)
const [form2Data, setForm2Data] = useState('Form 2 placeholder')

return (
<>
<textarea
value = {form2Data}
onInput={(event) => setForm2Data(event.target.value)}
/>
<p>The value is {form1Data} + {form2Data}</p>
</>
);
}
import { useContext, useState } from "preact/hooks";
import { Form1Context } from './Context.tsx';

export default function Form2() {
const [form1Data, setForm1Data] = useContext(Form1Context)
const [form2Data, setForm2Data] = useState('Form 2 placeholder')

return (
<>
<textarea
value = {form2Data}
onInput={(event) => setForm2Data(event.target.value)}
/>
<p>The value is {form1Data} + {form2Data}</p>
</>
);
}
The app compiles fine, but the actual result is empty.
Stack Overflow
How to send data from a child component to its sibling?
I want create an app with two forms, each form in its own component. Users type in form 1, then the data will be passed to component 2. In there it will join the data of what they type in form 2. H...
MMaDsEn1/14/2024
In your Form2 component, the line <p>The value is {form1Data} + {form2Data}</p> is not joining the two values properly. Try using curly braces and the + sign outside the string to link the values. See if this works <p>The value is {form1Data + ' ' + form2Data}</p>
OOoker1/14/2024
still not working besides that, do you think the code should work?
MMaDsEn1/14/2024
The concept is valid, but Fresh might need another data structure to make it work. I might take a look at it later on.
OOoker1/14/2024
GitHub
unable to use preact context in fresh · Issue #983 · denoland/fresh
I managed to use preactcreateContext hook as the following: hooks/ShoppingCartProvider.tsx export const ShoppingCartContext = createContext({} as ShoppingCart); [...] return ( <ShoppingCartConte...
OOoker1/14/2024
I think this is relevant

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