Incorporating unit measurements into input data

I am currently working on styling an input to only accept numbers while allowing the user to add a unit of measurement (such as kg, km, etc.) immediately after the value. I prefer not to use span because I want the unit measurement to appear as the user starts typing, with a single letter space between the number and the unit. My project involves TypeScript and React hooks.

I would greatly appreciate it if we could set limits on the input values to prevent them from exceeding the width of the input field. Additionally, I would like to see a version using Form.Control instead of a standard input, in case I need to implement a similar feature in the future using Forms.

Click here to see an example of the desired end result

typescriptreact-hooks

Answer №1

Imagine you are working with the code below:

    <input id="myinput" type="text">

Here is a piece of code in typescript that is designed to function with the given html:

const inputElement = <HTMLInputElement>document.getElementById("myinput");
const addUnit = (element: HTMLInputElement, unitType: string) => {
  inputElement.addEventListener("input", () => {
    element.value = element.value.replace(new RegExp(` ${unitType}`), "") + ` ${unitType}`;
  });
};
if (inputElement) addUnit(inputElement, "km");

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