Adding a placeholder to a MUI Select component with different value prop and MenuItem options: a step-by-step guide

Is there a way to include a placeholder (-- Select --) in the MUI Select component below?

const [country, setCountry] = useState("")

<FormControl fullWidth error={!country}>
    <Select
        displayEmpty
        renderValue={selected => selected.length === 0 ? '-- Select --' : selected}
        value={country}
        onChange={e => setCountry(e.target.value)}
    >
        <MenuItem value='US'>America</MenuItem>
        <MenuItem value='CA'>Canada</MenuItem>
        <MenuItem value='UK'>England</MenuItem>
    </Select>
    {!country && <FormHelperText>This field is required.</FormHelperText>}
</FormControl>

After adding the displayEmpty and renderValue props to the Select component, there was an issue where selecting 'America' displayed 'US' instead of 'America'.

renderValue={selected => selected.length === 0 ? '-- Select --' : selected}

The problem was resolved by adjusting the value props as shown below.

<MenuItem value='America'>America</MenuItem>
<MenuItem value='Canada'>Canada</MenuItem>
<MenuItem value='England'>England</MenuItem>

However, since only country codes will be stored in the database, the values must remain 'US', 'CA', and 'UK'. Does anyone know how to add a placeholder while still displaying the correct option when it's selected?

javascriptmaterial-ui

Answer №1

If you're looking for the best way to achieve this, it is highly recommended to locate the correct label within your object.

Make sure you have an array of countries from which you are obtaining the list. If not already available, please create one.

Each country in the list should have both an `id` and a `label`. When a country is selected (with a selected length greater than 0), search for that country using its `id` in the list and display its corresponding label.

const CountryFormComponent = () => {

...rest of component body

const listOfCountries = [{id : 'US', label: 'America'},
{id : 'CA', label: 'Canada'},
{id : 'UK', label: 'England'},
];

const generateRenderValue = (selected) => {
return (selected.length === 0 ? '-- Select --' : listOfCountries.find((x) => x.id === selected).label);
}

....
//return statement
....
<FormControl fullWidth error={!country}>
    <Select
        displayEmpty
        renderValue={generateRenderValue}
        value={country}
        onChange={e => setCountry(e.target.value)}
    >
        {listOfCountries.map((x) => <MenuItem value={x.id}>{x.label}</MenuItem>}
    </Select>

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