How can I configure Material-UI's textfield to return a numerical value instead of a string when the type is set to "number"?

Utilizing Material-UI's TextField alongside react-hook-form to monitor inputs has raised an issue for me. I have observed that regardless of the input type, it always returns a string. This creates conflicts with the data types I am using in my codebase.

I have researched various methods to address this problem on the side of react-hook-form, such as manipulating the returned data, but I have not found any information on making TextField return a different type based on its usage. It surprises me, especially considering that, from what I comprehend, valueAsNumber is natively available on HTML inputs (https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement)

typescriptmaterial-uitextfieldreact-hook-form

Answer №1

It is impossible to make MUI's <TextField> automatically return a number type since it is based on the HTML <input> element, which inherently deals with text input.

If you are utilizing the controlled state with the <TextField> component, you can easily change the returned type using the onChange handler and valueAsNumber:

<TextField
    id="outlined-controlled"
    label="Number Field"
    value={numValue}
    type="number"
    onChange={(event) => {
        setNumValue(event.target.valueAsNumber);
    }}
/>

If necessary, you can also specifically convert to a number type using methods such as parseInt(event.target.value) or parseFloat(event.target.value). There are various conversion techniques outlined in this helpful article: https://www.freecodecamp.org/news/how-to-convert-a-string-to-a-number-in-javascript/.

In situations where you must use <TextField> in an uncontrolled form-submission setup, there are alternative solutions provided in: Passing HTML input value as a JavaScript Function Parameter.

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