Update table without refreshing after adding an item in reactjs

Question

I'm developing an application in react.Js

And I have a table that I need to update without having to refresh the page.

The code:

const App = () => {
    const [item, setItem] = useState([])
    const [category, setCategory] = useState([])

    const categories = category.map(elem => ({
        value: elem.id,
        label: elem.cat,
    }));

    const [category_select, setCategorySelect] = React.useState(null);

    function handleChangeCategory(value) {
        setCategorySelect(value);
    }

    useEffect(() => {
        getItems()
    }, [])

    useEffect(() => {
        getCategories()
    }, [])

    const getItems = async () => {
        const response = await axios.get(REQUEST_1)
        setItem(response.data)
    }

    const getCategories = async () => {
        const response = await axios.get(REQUEST_2)
        setCategory(response.data)
    }

    const addItems = () => {
        axios.post(`${REQUEST_1}`, {cat: category_select.value});
    };

    const body = () => {
        return item && item.map((elem,j) => {
            return (
                <tr key={elem.id}>
                    <td><span>{elem.cat}</span></td>
                </tr>
            )
        })
    }

    return (
        <>
            <div>
                <div>
                    <div>
                        <div>
                            <NoSsr>
                                <Select
                                    classes={classes}
                                    styles={selectStyles}
                                    inputId="category"
                                    TextFieldProps={{
                                        label: 'Category',
                                        InputLabelProps: {
                                        htmlFor: 'category',
                                        shrink: true,
                                        },
                                        placeholder: 'Search',
                                    }}
                                    options={categories}
                                    components={components}
                                    value={category}
                                    onChange={handleChangeCategory}
                                />
                            </NoSsr>
                            <span>Select</span>
                        </div>
                        <div>
                            <label>&nbsp;</label>
                            <span onClick={addItems}></span>
                        </div>
                    </div>
                    <div>
                        <div>
                            <div>
                                <table>
                                    <thead>
                                        <tr>
                                            <th>
                                                <span>Category</span>
                                            </th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        {body()}
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </>
    )
}

export default App;

The idea is that a category is selected and the item is added.

What I need is to be able to update the map (return item && item.map((elem,j) => {...})) after clicking on <span onClick={addItems}></span> which calls the addItems function that adds the item. Simply put I need it to be added in the table without having to update.

How can I do it, suggestions?

Saba · Accepted Answer · 2020-12-27 12:44:25Z

You need to add the dependency to the useEffect so that every time the user wants adds an item, getItems() request is called to get the new items. So, your code might look like something like this:

const App = () => {
    const [item, setItem] = useState([])
    const [category, setCategory] = useState([])
    const [addedItem, setAddedItem] = useState('')
    
    
    const categories = category.map(elem => ({
        value: elem.id,
        label: elem.cat,
    }));

    const [categorySelect, setCategorySelect] = React.useState(null);

    function handleChangeCategory(value) {
        setCategorySelect(value);
    }

    useEffect(() => {
        getItems()
    }, [addedItem])

    useEffect(() => {
        getCategories()
    }, [])

    const getItems = async () => {
        const response = await axios.get(REQUEST_1)
        setItem(response.data)
    }

    const getCategories = async () => {
        const response = await axios.get(REQUEST_2)
        setCategory(response.data)
    }

    const addItems = () => {
        const response = await axios.post(`${REQUEST_1}`, {cat: category_select.value});
        setAddedItem(response.data)
    };

    const body = () => {
        return item && item.map((elem,j) => {
            return (
                <tr key={elem.id}>
                    <td><span>{elem.cat}</span></td>
                </tr>
            )
        })
    }

    return (
        <>
            <div>
                <div>
                    <div>
                        <div>
                            <NoSsr>
                                <Select
                                    classes={classes}
                                    styles={selectStyles}
                                    inputId="category"
                                    TextFieldProps={{
                                        label: 'Category',
                                        InputLabelProps: {
                                        htmlFor: 'category',
                                        shrink: true,
                                        },
                                        placeholder: 'Search',
                                    }}
                                    options={categories}
                                    components={components}
                                    value={category}
                                    onChange={handleChangeCategory}
                                />
                            </NoSsr>
                            <span>Select</span>
                        </div>
                        <div>
                            <label>&nbsp;</label>
                            <span onClick={addItems}></span>
                        </div>
                    </div>
                    <div>
                        <div>
                            <div>
                                <table>
                                    <thead>
                                        <tr>
                                            <th>
                                                <span>Category</span>
                                            </th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        {body()}
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </>
    )
}

export default App;

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