反应选择不显示，没有价值

Question

I would like to do a form with select. I use hooks and I use react-select for this.

My problems: The fiel select don't show the default value. When I select value the field don't show it. When I click on submit button, no value are send.

I don't understand why, someone could help me please?

this is my code:

function SelectFieldRequired(name, value, onChange) {
  
  let options = [
    {value: "vitrine-cms", label: "Site vitrine CMS"},
    {value: "vitrine-main", label: "Site vitrine sur-mesure"},
    {value: "eCommerce", label: "Site eCommerce"},
    {value: "autre-site", label: "Autre site"},
    {value: "ponctuel", label: "Mission ponctuelle"},
    {value: "maintenance", label: "Maintenance"},
    {value: "autre", label: "Autre choix"},
  ]

return( 
  <>
    <div>Nature de la demande *</div>
    <Select
          name={name}
          value={value}
          defaultValue={options[1]}
          onChange={onChange}
          required
          options={options}
    />    
  </>
  )
}
export default function ContactForm() {
  const [form, setForm] = useState({
    lastName: "",
    to_name: "service_........",
    firstName: "",
    company: "",
    phone: "",
    email: "",
    natureOfTheRequest: null,
    message: "",
    acceptCGU: false,
  });
  const sendEmail = (e) => {
    e.preventDefault();

    emailjs
      .sendForm(
        "service_........",
        "template_......",
        e.target,
        "user_........"
      )

      .then(
        (result) => {
          console.log(result);
          alert("Email bien envoyé!!!");
        },
        (error) => {
          console.log(error);
        }
      );
    e.target.reset();
  };


  return (
    <div className="container">
      <form onSubmit={sendEmail}>
}
         <SelectFieldRequired 
          className="request col-12" 
          name="natureOfTheRequest" 
          value={form.natureOfTheRequest} 
          onChange={setForm}
          id="natureOfTheRequest" 
        />
        {/* SUBMIT button */}
        <button
          type="submit"
          id={styles.submitButton}
          className="btn btn-primary"
        >
          {" "}
          Envoyer le formulaire
        </button>
      </form>
    </div>
  );
}

Thank you for your help.

Answer 1

You're setting the Select value to form.natureOfTheRequest , so you need to update that specific field on its onChange callback, rather than simply passing setForm .

The callback could look like the following.

const onChange = (value) => {
    setForm((prevForm) => ({
      ...prevForm,
      natureOfTheRequest: value
    }));
};

Then, modify the SelectFieldRequired 's onChange prop to receive it.

<SelectFieldRequired 
    className="request col-12" 
    name="natureOfTheRequest" 
    value={form.natureOfTheRequest} 
    onChange={onChange}
    id="natureOfTheRequest" 
/>

Since you're explicitly setting the value on the Select , that also overrides the defaultValue you have set. Instead, you can set the form.natureOfTheRequest initial value to options[1] .

const [form, setForm] = useState({
    lastName: "",
    to_name: "service_........",
    firstName: "",
    company: "",
    phone: "",
    email: "",
    natureOfTheRequest: options[1],
    message: "",
    acceptCGU: false,
});