Navigating Form Submission in Next.js

In this code snippet, I attempted to perform simple addition (ket=name + names). The desired outcome is a numerical sum displayed as “ket”. However, when entering 3 and 6 into the input fields, the result appears as 36 instead of 9.

export default function Kettenl() {
  const submitContact = async (event) => {
    event.preventDefault();
    const names = event.target.names.value;
    const name = event.target.name.value;
    let ket = name + names;
    alert(`Is your combined name ${ket}?`);
  };

  return (
    <div className="max-w-xs my-2 overflow-hidden rounded shadow-lg">
      <div className="px-6 py-4">
        <div className="mb-2 text-xl font-bold">Contact us</div>
        <form className="flex flex-col" onSubmit={submitContact}>
          <label htmlFor="name" className="mb-2 italic">
            Name
          </label>
          <input
            className="mb-4 border-b-2"
            id="name"
            name="name"
            type="number"
            required
          />
          <label htmlFor="names" className="mb-2 italic">
            Names
          </label>
          <input
            className="mb-4 border-b-2"
            id="names"
            name="names"
            type="number"
            required
          />
          <button
            type="submit"
            className="px-4 py-2 font-bold text-white bg-blue-500 rounded-full hover:bg-blue-700"
          >
            Submit
          </button>
        </form>
      </div>
    </div>
  );
}

Answer №1

The reason for this issue is that the values are being interpreted as strings '3' + '6' = '36' To correct this, you should update your code to:

const names = parseInt(event.target.names.value);
const name = parseInt(event.target.name.value);

In addition, it appears that you are saving and retrieving the values incorrectly. It is recommended to grasp the fundamentals of React before proceeding with Next.js. https://reactjs.org/docs/forms.html Take a look at the controlled and uncontrolled inputs sections in the documentation. Even if your application functions after making the mentioned adjustments, it's important to avoid this approach.

Answer №2

One of the reasons for this is that values are automatically returned as strings from the designated element. However, when dealing with input fields specified with type="number", you can simply utilize the input value using e.target.names.valueAsNumber.

const processForm = async (event) => {
    event.preventDefault();
    const names = event.target.names.valueAsNumber;
    const name = event.target.name.valueAsNumber;
    let result = name + names;
    alert(`Are you saying your name is ${result}?`);
  };

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