Typscript version of react-hook-form code with Ionic Framework

App.tsx

import React, { useState } from "react";
import {
  IonApp,
  IonPage,
  IonHeader,
  IonContent,
  IonItem,
  IonLabel,
  IonInput,
  IonRadioGroup,
  IonListHeader,
  IonRadio,
  IonSelect,
  IonSelectOption,
  IonRange,
  IonButton
} from "@ionic/react";
import { useForm, Controller } from "react-hook-form";

/* Core CSS required for Ionic components to work properly */
import "@ionic/react/css/core.css";

/* Basic CSS for apps built with Ionic */
import "@ionic/react/css/normalize.css";
import "@ionic/react/css/structure.css";
import "@ionic/react/css/typography.css";

/* Optional CSS utils that can be commented out */
import "@ionic/react/css/padding.css";
import "@ionic/react/css/float-elements.css";
import "@ionic/react/css/text-alignment.css";
import "@ionic/react/css/text-transformation.css";
import "@ionic/react/css/flex-utils.css";
import "@ionic/react/css/display.css";

/* Theme variables */
import "./theme/variables.css";

let renderCount = 0;
let initialValues = {
  rangeInfo: -100,
  fullName: "",
  gender: "",
  techCos: "",
  email: ""
};

const App: React.FC = () => {
  const { control, handleSubmit, formState, reset, errors } = useForm({
    defaultValues: { ...initialValues },
    mode: "onChange"
  });

  const [data, setData] = useState();
  renderCount++;

  /**
   *
   * @param _fieldName
   */
  const showError = (_fieldName: string) => {
    let error = (errors as any)[_fieldName];
    return error ? (
      <div style={{ color: "red", fontWeight: "bold" }}>
        {error.message || "Field Is Required"}
      </div>
    ) : null;
  };

  /**
   *
   * @param data
   */
  const onSubmit = (data: any) => {
    alert(JSON.stringify(data, null, 2));
    setData(data);
  };

  return (
    <IonApp>
      <IonPage>
        <IonHeader>
          <h2>React Hook Form work with Ionic Components</h2>
        </IonHeader>

        <IonContent>
          <form onSubmit={handleSubmit(onSubmit)} style={{ padding: 18 }}>
            <span className="counter">Render Count: {renderCount}</span>

            <IonItem>
              <IonLabel>Name - IonInput</IonLabel>
              <Controller
                as={IonInput}
                control={control}
                onChangeName="onIonChange"
                onChange={([selected]) => {
                  console.log("fullName", selected.detail.value);
                  return selected.detail.value;
                }}
                name="fullName"
                rules={{
                  required: true,
                  minLength: { value: 4, message: "Must be 4 chars long" }
                }}
              />
            </IonItem>
            {showError("fullName")}

            <IonItem>
              <IonLabel>Email</IonLabel>
              <Controller
                as={IonInput}
                control={control}
                onChangeName="onIonChange"
                onChange={([selected]) => {
                  return selected.detail.value;
                }}
                name="email"
                rules={{
                  required: true,
                  pattern: {
                    value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i,
                    message: "invalid email address"
                  }
                }}
              />
            </IonItem>
            {showError("email")}
            <Controller
              as={
                <IonRadioGroup>
                  <IonListHeader>
                    <IonLabel>
                      <h1>Manufacturers</h1>
                    </IonLabel>
                  </IonListHeader>
                  <IonItem>
                    <IonLabel>Apple</IonLabel>
                    <IonRadio value="apple" />
                  </IonItem>
                  <IonItem>
                    <IonLabel>Amazon</IonLabel>
                    <IonRadio value="amazon" />
                  </IonItem>
                  <IonItem>
                    <IonLabel>Microsoft</IonLabel>
                    <IonRadio value="microsoft" />
                  </IonItem>
                </IonRadioGroup>
              }
              control={control}
              name="techCos"
              rules={{ required: true }}
              onChangeName="onIonChange"
              onChange={([selected]) => {
                console.log(selected.detail.value);
                return selected.detail.value;
              }}
            />

            <IonItem>
              <IonLabel>Gender</IonLabel>
              <Controller
                as={
                  <IonSelect placeholder="Select One">
                    <IonSelectOption value="FEMALE">Female</IonSelectOption>
                    <IonSelectOption value="MALE">Male</IonSelectOption>
                  </IonSelect>
                }
                control={control}
                onChangeName="onIonChange"
                onChange={([selected]) => {
                  console.log(selected.detail.value);
                  return selected.detail.value;
                }}
                name="gender"
                rules={{ required: true }}
              />
            </IonItem>

            <IonItem>
              <Controller
                as={
                  <IonRange min={-200} max={200} color="secondary">
                    <IonLabel slot="start">-200</IonLabel>
                    <IonLabel slot="end">200</IonLabel>
                  </IonRange>
                }
                control={control}
                name="rangeInfo"
                onChangeName="onIonChange"
                onChange={([selected]) => {
                  console.log(selected.detail.value);
                  return selected.detail.value;
                }}
                rules={{ required: true }}
              />
            </IonItem>
            <IonItem>
              <IonLabel>
                formState.isValid: {(formState.isValid === true).toString()}
              </IonLabel>
            </IonItem>
            {data && (
              <pre style={{ textAlign: "left" }}>
                {JSON.stringify(data, null, 2)}
              </pre>
            )}

            <IonButton
              type="button"
              onClick={() => {
                reset(initialValues);
              }}
            >
              Reset Form
            </IonButton>
            <IonButton type="submit" disabled={formState.isValid === false}>
              submit
            </IonButton>
          </form>
        </IonContent>
      </IonPage>
    </IonApp>
  );
};

export default App;

Thanks for putting this tutorial together - it was super helpful! FYI - rhf removed the onChangeName prop (among others) beginning with version 6.
Looks like the recommended way forward is to use a renderprop in place of component

See changelog and example here:
https://github.com/react-hook-form/react-hook-form/blob/master/CHANGELOG.md#changed-2

If you check the blog post I have on dev.to, I have updated the sample to reflect that... there is also an updated project jn my GitHub repo, enjoy!!

On Sat, Jul 25, 2020 at 11:08 AM tx-tim ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Thanks for putting this tutorial together - it was super helpful! FYI - rhf removed the onChangeName prop (among others) beginning with version 6. Looks like the recommended way forward is to use a renderprop in place of component See changelog and example here: https://github.com/react-hook-form/react-hook-form/blob/master/CHANGELOG.md#changed-2 — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/86251779cbefacf4c9397ea6a574809a#gistcomment-3391278>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAEAFGKAXT2NSVQ3FXM4HXLR5LYNBANCNFSM4PHP67GQ> .

--

…

-- Aaron K. Saunders CEO Clearly Innovative Inc - Luma Lab - In3 aaron@clearlyinnovative.com www.clearlyinnovative.com www.In3DC.com This email message and any attachment(s) are for the sole use of the intended recipient(s) and may contain proprietary and/or confidential information which may be privileged or otherwise protected from disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient(s), please contact the sender by reply email and destroy the original message and any copies of the message as well as any attachment(s) to the original message.

Hey Aaron just wondering how to enable the submit button, its not enabling when I fill out all the fields lol

Could you please consider adding an example for IonCheckbox? I'm stuck because somehow boolean values seem to get treated differently.

Oct 2022: is there a more recent version that works? I'm currently getting:

Failed to compile.

TS2322: Type '{ as: ForwardRefExoticComponent<IonInput & Pick<HTMLAttributes<HTMLIonInputElement>, "onBlur" | "onChange" | "onSubmit" | "hidden" | "dir" | "slot" | ... 246 more ... | "onTransitionEndCapture"> & StyleReactProps & RefAttributes<...>>; ... 4 more ...; rules: { ...; }; }' is not assignable to type 'IntrinsicAttributes & { render: ({ field, fieldState, formState, }: { field: ControllerRenderProps<{ rangeInfo: number; fullName: string; gender: string; techCos: string; email: string; }, "fullName">; fieldState: ControllerFieldState; formState: UseFormStateReturn<...>; }) => ReactElement<...>; } & UseControllerPro...'.
  Property 'as' does not exist on type 'IntrinsicAttributes & { render: ({ field, fieldState, formState, }: { field: ControllerRenderProps<{ rangeInfo: number; fullName: string; gender: string; techCos: string; email: string; }, "fullName">; fieldState: ControllerFieldState; formState: UseFormStateReturn<...>; }) => ReactElement<...>; } & UseControllerPro...'.
    79 |               <IonLabel>Name - IonInput</IonLabel>
    80 |               <Controller
  > 81 |                 as={IonInput}
       |                 ^^
    82 |                 control={control}
    83 |                 onChangeName="onIonChange"
    84 |                 onChange={([selected]) => {


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        react-scripts build exited with exit code 1.
        
        Re-running this command with the --verbose flag may provide more information.
make: *** [Makefile:4: build] Error 1