@ohos.app.form.FormExtensionAbility (FormExtensionAbility)

The FormExtensionAbility module provides lifecycle callbacks invoked when a widget is created, destroyed, or updated.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. The APIs of this module can be used only in the stage model.

Modules to Import

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

Attributes

System capability: SystemCapability.Ability.Form

onAddForm

onAddForm(want: Want): formBindingData.FormBindingData

Called to notify the widget provider that a Form instance (widget) is being created.

System capability: SystemCapability.Ability.Form

Parameters

Return value

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import Want from '@ohos.app.ability.Want';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onAddForm(want: Want) {
    console.log(`FormExtensionAbility onAddForm, want: ${want.abilityName}`);
    let dataObj1: Record<string, string> = {
      'temperature': '11c',
      'time': '11:00'
    };

    let obj1: formBindingData.FormBindingData = formBindingData.createFormBindingData(dataObj1);
    return obj1;
  }
}

onCastToNormalForm

onCastToNormalForm(formId: string): void

Called to notify the widget provider that a temporary widget is being converted to a normal one.

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onCastToNormalForm(formId: string) {
    console.log(`FormExtensionAbility onCastToNormalForm, formId: ${formId}`);
  }
};

onUpdateForm

onUpdateForm(formId: string): void

Called to notify the widget provider that a widget is being updated. After obtaining the latest data, your application should call updateForm of formProvider to update the widget data.

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
import Base from '@ohos.base';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onUpdateForm(formId: string) {
    console.log(`FormExtensionAbility onUpdateForm, formId: ${formId}`);
    let param: Record<string, string> = {
      'temperature': '22c',
      'time': '22:00'
    }
    let obj2: formBindingData.FormBindingData = formBindingData.createFormBindingData(param);
    formProvider.updateForm(formId, obj2).then(() => {
      console.log(`FormExtensionAbility context updateForm`);
    }).catch((error: Base.BusinessError) => {
      console.error(`FormExtensionAbility context updateForm failed, data: ${error}`);
    });
  }
};

onChangeFormVisibility

onChangeFormVisibility(newStatus: { [key: string]: number }): void

Called to notify the widget provider that the widget visibility status is being changed.

This API is valid only for system applications when formVisibleNotify is set to true.

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
import Base from '@ohos.base';

// There is no Object.keys in ArkTS, and the for..in... syntax cannot be used.
// If an error is reported, extract this API to a .ts file and expose it. Then import the API to the required .ets file.
function getObjKeys(obj: Object): string[] {
  let keys = Object.keys(obj);
  return keys;
}

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onChangeFormVisibility(newStatus: Record<string, number>) {
    console.log(`FormExtensionAbility onChangeFormVisibility, newStatus: ${newStatus}`);
    let param: Record<string, string> = {
      'temperature': '22c',
      'time': '22:00'
    }
    let obj2: formBindingData.FormBindingData = formBindingData.createFormBindingData(param);

    let keys: string[] = getObjKeys(newStatus);

    for (let i: number = 0; i < keys.length; i++) {
      console.log(`FormExtensionAbility onChangeFormVisibility, key: ${keys[i]}, value= ${newStatus[keys[i]]}`);
      formProvider.updateForm(keys[i], obj2).then(() => {
        console.log(`FormExtensionAbility context updateForm`);
      }).catch((error: Base.BusinessError) => {
        console.error(`Operation updateForm failed. Cause: ${JSON.stringify(error)}`);
      });
    }
  }
};

onFormEvent

onFormEvent(formId: string, message: string): void

Called to instruct the widget provider to process the widget event. (This API can be used only in JS widget.)

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onFormEvent(formId: string, message: string) {
    console.log(`FormExtensionAbility onFormEvent, formId: ${formId}, message: ${message}`);
  }
};

onRemoveForm

onRemoveForm(formId: string): void

Called to notify the widget provider that a Form instance (widget) is being destroyed.

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onRemoveForm(formId: string) {
    console.log(`FormExtensionAbility onRemoveForm, formId: ${formId}`);
  }
};

onConfigurationUpdate

onConfigurationUpdate(newConfig: Configuration): void

Called when the configuration of the environment where the FormExtensionAbility is running is updated.

This lifecycle callback is triggered only when the configuration is updated while the FormExtensionAbility is alive. If no operation is performed within 5 seconds after a FormExtensionAbility instance is created, the instance will be deleted.

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import { Configuration } from '@ohos.app.ability.Configuration';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onConfigurationUpdate(newConfig: Configuration) {
    // This lifecycle callback is triggered only when the configuration is updated while the FormExtensionAbility is alive.
    // If no operation is performed within 5 seconds after a FormExtensionAbility instance is created, the instance will be deleted.
    console.log(`onConfigurationUpdate, config: ${JSON.stringify(config)}`);
  }
};

onAcquireFormState

onAcquireFormState?(want: Want): formInfo.FormState

Called to notify the widget provider that the widget host is requesting the widget state. By default, the initial widget state is returned. (You can override this API as required.)

System capability: SystemCapability.Ability.Form

Parameters

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import formInfo from '@ohos.app.form.formInfo';
import Want from '@ohos.app.ability.Want';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onAcquireFormState(want: Want) {
    console.log(`FormExtensionAbility onAcquireFormState, want: ${want}`);
    return formInfo.FormState.UNKNOWN;
  }
};

onShareForm

onShareForm?(formId: string): { [key: string]: Object }

Called to notify the widget provider that the widget host is sharing the widget data.

System API: This is a system API.

System capability: SystemCapability.Ability.Form

Parameters

Return value

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onShareForm(formId: string) {
    console.log(`FormExtensionAbility onShareForm, formId: ${formId}`);
    let wantParams: Record<string, Object> = {
      'temperature': '20',
      'time': '2022-8-8 09:59',
    };
    return wantParams;
  }
};

onAcquireFormData¹⁰⁺

onAcquireFormData?(formId: string): { [key: string]: Object }

Called to notify the widget provider that the widget host is requesting the custom data.

System API: This is a system API.

System capability: SystemCapability.Ability.Form

Parameters

Return value

Example

import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';

export default class MyFormExtensionAbility extends FormExtensionAbility {
  onAcquireFormData(formId: string) {
    console.log(`FormExtensionAbility onAcquireFormData, formId: ${formId}`);
    let wantParams: Record<string, Object> = {
      'temperature': '20',
      'time': '2022-8-8 09:59',
    };
    return wantParams;
  }
};