React Course: Diary App Example - Implementing Common Components 2: Editor Component

In this course, we will explore the process of implementing the Editor component as part of developing a diary app using React. The Editor component plays an important role by providing input fields necessary for users to write their diaries and helps manage the submitted content. In this article, I will explain in detail the design and implementation of the component, the necessary state management methods, and various features to enhance the user experience.

1. Overview of the Editor Component

The Editor component is a core component of the diary app, performing the following functions:

Providing a text area for user input
Functionality to save the title and content
Validating the input and providing error messages
An event handler to pass the submitted content to the parent component

Through these functions, users can write diaries and save them for later review.

2. Designing the Editor Component

Before designing the Editor component, we need to determine what data is required. The states managed in the component are as follows:

Title: State to capture the title of the diary
Content: State to capture the content of the diary
Error Message: State to store error messages resulting from input validation

Each state is managed using the useState hook.

2.1 State Initialization

import React, { useState } from 'react';

const Editor = ({ onSave }) => {
    const [title, setTitle] = useState('');
    const [content, setContent] = useState('');
    const [error, setError] = useState(null);

    // ...
};

2.2 Defining Props

The Editor component will receive a save handler passed from the parent component via a prop called onSave. This handler is called when the user writes and saves their diary.

3. Handling Input

The input elements used in the Editor include two input elements for the title and content, and one textarea element. Event handlers are set up to update the state when input occurs.

3.1 Input Event Handlers

const handleTitleChange = (event) => {
    setTitle(event.target.value);
};

const handleContentChange = (event) => {
    setContent(event.target.value);
};

3.2 Render Method

Now we will define how the Editor component will render based on the state and event handlers. The JSX structure containing the input fields and save button is as follows:

return (
    
        Write a Diary
        
        
        {error && {error}}
        
    
);

4. Implementing the Save Functionality

To save the diary written by the user, we implement the handleSave function, which is called when the save button is clicked. This function includes logic to validate the input values and call the parent’s onSave handler if there are no issues.

4.1 Validating Input

const handleSave = () => {
    if (!title || !content) {
        setError('Title and content are required fields.');
        return;
    }
    setError(null);
    onSave({ title, content });
    // Clear input fields
    setTitle('');
    setContent('');
};

5. Integration: Using the Editor Component in Parent

The Editor component with the save functionality implemented needs to be integrated with other parts of the user interface. The parent component will use the Editor to save the written diary and add it to the list.

import React, { useState } from 'react';
import Editor from './Editor';

const DiaryApp = () => {
    const [entries, setEntries] = useState([]);

    const handleSaveEntry = (entry) => {
        setEntries([...entries, entry]);
    };

    return (
        
            My Diary
            
            
                {entries.map((entry, index) => (
                    
                        {entry.title}
                        {entry.content}
                    
                ))}
            
        
    );
};

export default DiaryApp;

6. Conclusion and Additional Features

In this article, we covered the process of implementing the Editor component for a diary app using React. Basic functionality for users to write and save diaries has been established. Additionally, the following features can be considered:

Functionality to edit saved diaries
Diary deletion functionality
Functionality to sort or filter diaries by date
Functionality to save written diaries to local storage or a server

The experience of combining various components and managing state to create an interactive app using React is very rewarding. I encourage you to continue studying and challenging yourself on various topics!

React Course: Diary App Example – Implementing Common Components 2: Editor Component