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Mohamed Khaled Yousef
Mohamed Khaled Yousef

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Week 8 - Todo-Delete App

Welcome to Week 8 of React Curve

Hello developer!, glad to see you again.

This is a react-curve, open source project where I can share and start creating small UI components in the way I understood the concepts to build large scale projects .


Todo-Delete App

Todo-Delete app
This week we created a todo-delete app. An app that allows user to add any tasks in a form and delete that task from the list in react.

To create a Todo-Delete component; We have to :

  • Create three components, the parent TodoDeleteV2, ItemForm and PrintItems child components.
  • In the parent TodoDeleteV2 component :
    • Create a state that stores the lists and function to update what’s on the screen in response to submit button.
    • In handleAddItem method, when we want to update an array stored in state, we need to make a copy of an existing one, and then set state to use the new array.
    • In handleDeleteItem method, we filter our list items and return all the list items except the once that was removed when clicked.
    • Send handleAddItem method to ItemForm component and send handleDeleteItem method and lists to PrintItems component as props.
  • In the child ItemForm component :
    • Create a state that stores the item and function that handles updates in response to a change input and submit button.
    • We handleInputChange and submit when a user interacts with the form.
  • Finally, In the child PrintItems component :
    • We just map to render the list of items.
    • For each list item, print the name of the item and Delete button to delete that item.

Code

TodoDeleteV2 Component

import React, {useState} from 'react';

import ItemForm from './ItemForm';
import PrintItems from './PrintItems';

const TodoDeleteV2 = () => {
    const [lists, setLists] = useState([])

    const handleAddItem = (item) => {
      item.id = lists.length + 1
      setLists([...lists, item])
    }

    const handleDeleteItem = (id) => {
      setLists(lists.filter((item) => item.id !== id))
    }

    return (
        <div>
          <h2>Delete from Todo</h2>

          <ItemForm addItem={handleAddItem} />
          <PrintItems 
              lists={lists} 
              deleteItem={handleDeleteItem}/>

      </div>
    );
}

export default TodoDeleteV2; 
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ItemForm Component

import React, {useState} from 'react'; 

const ItemForm = (props) => {
  const initialFormState = { id: null, name: '' }
  const [item, setItem] = useState(initialFormState)

  const handleInputChange = (ev) => {
    const { name, value } = ev.target

    setItem({ ...item, [name]: value })
  }

  const handleSubmit = (ev) => {
    ev.preventDefault()
    if (!item.name) return
    props.addItem(item)
    setItem(initialFormState)
  }

  return (
    <>
      <form onSubmit={handleSubmit}>
        <label>Enter Item</label> <br />
        <input
          type="text"
          name="name"
          value={item.name}
          onChange={handleInputChange}
        />
        <br />
        <button>Add new item</button>
      </form>
    </>
  );
}

export default ItemForm;
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PrintItems Component

import React from 'react';

const PrintItems = (props) => {
  return (
    <div>
      {props.lists.length > 0 ? (
        props.lists.map((item) => (
          <ul key={item.id}>
            <li>{item.name}</li>
            <button 
                onClick={() => 
                props.deleteItem(item.id)}>
              Delete
            </button>
          </ul>
        ))
      ) : (
        <div>
          No items
        </div>
      )}
    </div>
  );
}

export default PrintItems;
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Conclusion

Thank you for reading and any contribution is more than welcome in the threads below!

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