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react typescript context API

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Panicky Parrot answered on August 19, 2022 Popularity 10/10 Helpfulness 5/10

answer react typescript context API

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react typescript context API

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export type TodosContextState = {
  todos: string[];
  addTodo: (name: string) => void;
};
import React, { createContext, useState, FC } from "react";
import { TodosContextState } from "./types";

const contextDefaultValues: TodosContextState = {
  todos: [],
  addTodo: () => {}
};

export const TodosContext = createContext<TodosContextState>(
  contextDefaultValues
);

const TodosProvider: FC = ({ children }) => {
  const [todos, setTodos] = useState<string[]>(contextDefaultValues.todos);

  const addTodo = (newTodo: string) => setTodos((todos) => [...todos, newTodo]);

  return (
    <TodosContext.Provider
      value={{
        todos,
        addTodo
      }}
    >
      {children}
    </TodosContext.Provider>
  );
};

export default TodosProvider;

Popularity 10/10 Helpfulness 5/10 Language typescript

Source: dev.to

Tags: api react-typescript typescript

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Contributed on Aug 19 2022

Panicky Parrot

0 Answers Avg Quality 2/10

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react context with typescript

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import { createContext } from "react";

interface AppContextInterface {
  name: string;
  author: string;
  url: string;
}

const AppCtx = createContext<AppContextInterface | null>(null);

// Provider in your app

const sampleAppContext: AppContextInterface = {
  name: "Using React Context in a Typescript App",
  author: "thehappybug",
  url: "http://www.example.com",
};

export const App = () => (
  <AppCtx.Provider value={sampleAppContext}>...</AppCtx.Provider>
);

// Consume in your app
import { useContext } from "react";

export const PostInfo = () => {
  const appContext = useContext(AppCtx);
  return (
    <div>
      Name: {appContext.name}, Author: {appContext.author}, Url:{" "}
      {appContext.url}
    </div>
  );
};

Popularity 10/10 Helpfulness 4/10 Language whatever

Source: react-typescript-cheatsheet.netlify.app

Tags: react-context re

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Contributed on Oct 22 2022

Panicky Parrot

0 Answers Avg Quality 2/10

How to use React context in typescript

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// @types.todo.ts
export interface ITodo {
  id: number;
  title: string;
  description: string;
  status: boolean;
}
export type TodoContextType = {
  todos: ITodo[];
  saveTodo: (todo: ITodo) => void;
  updateTodo: (id: number) => void;
};

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: blog.logrocket.com

Tags: react-context re

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Contributed on Nov 02 2022

Shaun Modipane

0 Answers Avg Quality 2/10

How to use React context in typescript

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// components/AddTodo.tsx
import * as React from 'react';
import { TodoContext } from '../context/todoContext';
import { TodoContextType, ITodo } from '../@types/todo';

const AddTodo: React.FC = () => {
  const { saveTodo } = React.useContext(TodoContext) as TodoContextType;
  const [formData, setFormData] = React.useState<ITodo | {}>();
  const handleForm = (e: React.FormEvent<HTMLInputElement>): void => {
    setFormData({
      ...formData,
      [e.currentTarget.id]: e.currentTarget.value,
    });
  };
  const handleSaveTodo = (e: React.FormEvent, formData: ITodo | any) => {
    e.preventDefault();
    saveTodo(formData);
  };
  return (
    <form className="Form" onSubmit={(e) => handleSaveTodo(e, formData)}>
      <div>
        <div>
          <label htmlFor="name">Title</label>
          <input onChange={handleForm} type="text" id="title" />
        </div>
        <div>
          <label htmlFor="description">Description</label>
          <input onChange={handleForm} type="text" id="description" />
        </div>
      </div>
      <button disabled={formData === undefined ? true : false}>Add Todo</button>
    </form>
  );
};
export default AddTodo;

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: blog.logrocket.com

Tags: react-context re

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Contributed on Nov 02 2022

Shaun Modipane

0 Answers Avg Quality 2/10

How to use React context in typescript

Comment

-1

// context/todoContext.tsx
import * as React from 'react';
import { TodoContextType, ITodo } from '../@types/todo';

export const TodoContext = React.createContext<TodoContextType | null>(null);

const TodoProvider: React.FC<React.ReactNode> = ({ children }) => {
  const [todos, setTodos] = React.useState<ITodo[]>([
    {
      id: 1,
      title: 'post 1',
      description: 'this is a description',
      status: false,
    },
    {
      id: 2,
      title: 'post 2',
      description: 'this is a description',
      status: true,
    },
  ]);
  const saveTodo = (todo: ITodo) => {
    const newTodo: ITodo = {
      id: Math.random(), // not really unique - but fine for this example
      title: todo.title,
      description: todo.description,
      status: false,
    };
    setTodos([...todos, newTodo]);
  };
  const updateTodo = (id: number) => {
    todos.filter((todo: ITodo) => {
      if (todo.id === id) {
        todo.status = true;
        setTodos([...todos]);
      }
    });
  };
  return <TodoContext.Provider value={{ todos, saveTodo, updateTodo }}>{children}</TodoContext.Provider>;
};

export default TodoProvider;

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: blog.logrocket.com

Tags: react-context re

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Contributed on Nov 02 2022

Shaun Modipane

0 Answers Avg Quality 2/10

react typescript context API

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