# Admin Panel API for plugins

A Strapi plugin can interact with both the back end or the front end of the Strapi app. The Admin Panel API is about the front end part, i.e. it allows a plugin to customize Strapi's admin panel.

The admin panel is a React (opens new window) application that can embed other React applications. These other React applications are the admin parts of each Strapi plugin.

To create a plugin that interacts with the Admin Panel API:

  1. Create an entry file.
  2. Within this file, declare and export a plugin interface that uses the available actions.
  3. Require this plugin interface in a strapi-admin.js file at the root of the plugin package folder:
// path: [plugin-name]/strapi-admin.js

'use strict';

module.exports = require('./admin/src').default;

# Entry file

The entry file for the Admin Panel API is [plugin-name]/admin/src/index.js. This file exports the required interface, with the following functions available:

Function type Available functions
Lifecycle functions
Async function registerTrads

# Lifecycle functions

# register()

Type: Function

This function is called to load the plugin, even before the app is actually bootstrapped. It takes the running Strapi application as an argument (app).

Within the register function, a plugin can:

# registerPlugin()

Type: Function

Registers the plugin to make it available in the admin panel.

This function returns an object with the following parameters:

Parameter Type Description
id String Plugin id
name String Plugin name
injectionZones Object Declaration of available injection zones

✏️ NOTE

Some parameters can be imported from the package.json file.

Example:

// path: my-plugin/admin/src/index.js

// Auto-generated component
import PluginIcon from './components/PluginIcon';
import pluginId from './pluginId'

export default {
  register(app) {
    app.addMenuLink({
      to: `/plugins/${pluginId}`,
      icon: PluginIcon,
      intlLabel: {
        id: `${pluginId}.plugin.name`,
        defaultMessage: 'My plugin',
      },
      Component: async () => {
        const component = await import(/* webpackChunkName: "my-plugin" */ './pages/App');

        return component;
      },
      permissions: [], // array of permissions (object), allow a user to access a plugin depending on its permissions
    });
    app.registerPlugin({
      id: pluginId,
      name,
    });
  },
};

# bootstrap()

Type: Function

Exposes the bootstrap function, executed after all the plugins are registered.

Within the bootstrap function, a plugin can:

Example:

module.exports = () => {
  return {
    // ...
    bootstrap(app) {
      // execute some bootstrap code
      app
        .getPlugin('content-manager')
        .injectContentManagerComponent('editView', 'right-links', { name: 'my-compo', Component: () => 'my-compo' })
    },
  };
};

# Async function

While register() and bootstrap() are lifecycle functions, registerTrads() is an async function.

# registerTrads()

Type: Function

To reduce the build size, the admin panel is only shipped with 2 locales by default (en and fr). The registerTrads() function is used to register a plugin's translations files and to create separate chunks for the application translations. It does not need to be modified.

Example: Register a plugin's translation files 
export default {
  async registerTrads({ locales }) {
    const importedTrads = await Promise.all(
      locales.map(locale => {
        return import(
          /* webpackChunkName: "[pluginId]-[request]" */ `./translations/${locale}.json`
        )
          .then(({ default: data }) => {
            return {
              data: prefixPluginTranslations(data, pluginId),
              locale,
            };
          })
          .catch(() => {
            return {
              data: {},
              locale,
            };
          });
      })
    );

    return Promise.resolve(importedTrads);
  },
};

# Available actions

The Admin Panel API allows a plugin to take advantage of several small APIs to perform actions. Use this table as a reference:

Action API to use Function to use Related lifecycle function
Add a new link to the main navigation Menu API addMenuLink() register()
Create a new settings section Settings API createSettingSection() register()
Declare an injection zone Injection Zones API registerPlugin() register()
Add a reducer Reducers API addReducers() register()
Create a hook Hooks API createHook() register()
Add a single link to a settings section Settings API addSettingsLink() bootstrap()
Add multiple links to a settings section Settings API addSettingsLinks() bootstrap()
Inject a Component in an injection zone Injection Zones API injectComponent() bootstrap()
Register a hook Hooks API registerHook() bootstrap()

🤓 Replacing the WYSIWYG

The WYSIWYG editor can be replaced by taking advantage of the register lifecycle (see new WYSIWYG field in the admin panel guide).

💡 TIP

The admin panel supports dotenv variables.

All variables defined in a .env file and prefixed by STRAPI_ADMIN_ are available while customizing the admin panel through process.env.

The Menu API allows a plugin to add a new link to the main navigation through the addMenuLink() function with the following parameters:

Parameter Type Description
to String Path the link should point to
icon React Component Icon to display in the main navigation
intlLabel Object Label for the link, following the React Int'l (opens new window) convention, with:
  • id: id used to insert the localized label
  • defaultMessage: default label for the link
Component Async function Returns a dynamic import of the plugin entry point
permissions Array of Objects Permissions declared in the permissions.js file of the plugin

✏️ NOTE

intlLabel.id are ids used in translation files ([plugin-name]/admin/src/translations/[language].json)

Example:

// path: my-plugin/admin/src/index.js
import PluginIcon from './components/PluginIcon';

export default {
  register(app) {
    app.addMenuLink({
      to: '/plugins/my-plugin',
      icon: PluginIcon,
      intlLabel: {
        id: 'my-plugin.plugin.name',
        defaultMessage: 'My plugin',
      },
      Component: () => 'My plugin',
      permissions: [], // permissions to apply to the link
    });
    app.registerPlugin({ ... });
  },
  bootstrap() {},
};

# Settings API

The Settings API allows:

✏️ NOTE

Adding a new section happens in the register lifecycle while adding links happens during the bootstrap lifecycle.

All functions accept links as objects with the following parameters:

Parameter Type Description
id String React id
to String Path the link should point to
intlLabel Object Label for the link, following the React Int'l (opens new window) convention, with:
  • id: id used to insert the localized label
  • defaultMessage: default label for the link
Component Async function Returns a dynamic import of the plugin entry point
permissions Array of Objects Permissions declared in the permissions.js file of the plugin

# createSettingSection()

Type: Function

Create a new settings section.

The function takes 2 arguments:

Argument Type Description
first argument Object Section label:
  • id (String): section id
  • intlLabel (Object): localized label for the section, following the React Int'l (opens new window) convention, with:
    • id: id used to insert the localized label
    • defaultMessage: default label for the section
second argument Array of Objects Links included in the section

✏️ NOTE

intlLabel.id are ids used in translation files ([plugin-name]/admin/src/translations/[language].json)

Example:

// path: my-plugin/admin/src/index.js

const myComponent = async () => {
  const component = await import(
    /* webpackChunkName: "users-providers-settings-page" */ './pages/Providers'
  );

  return component;
};

export default {
  register(app) {
    app.createSettingSection(
      { id: String, intlLabel: { id: String, defaultMessage: String } }, // Section to create
      [
        // links
        {
          intlLabel: { id: String, defaultMessage: String },
          id: String,
          to: String,
          Component: myComponent,
          permissions: Object[],
        },
      ]
    );
  },
};

Type: Function

Add a unique link to an existing settings section.

Example:

// path: my-plugin/admin/src/index.js

const myComponent = async () => {
  const component = await import(
    /* webpackChunkName: "users-providers-settings-page" */ './pages/Providers'
  );

  return component;
};

export default {
  bootstrap(app) {
		// Adding a single link
		app.addSettingsLink(
		 'global', // id of the section to add the link to
			{
				intlLabel: { id: String, defaultMessage: String },
				id: String,
				to: String,
				Component: myComponent,
				permissions: Object[]
			}
    )
  }
}

Type: Function

Add multiple links to an existing settings section.

Example:

// path: my-plugin/admin/src/index.js

const myComponent = async () => {
  const component = await import(
    /* webpackChunkName: "users-providers-settings-page" */ './pages/Providers'
  );

  return component;
};

export default {
  bootstrap(app) {
    // Adding several links at once
    app.addSettingsLinks(
      'global', // id of the section to add the link in
        [{
          intlLabel: { id: String, defaultMessage: String },
          id: String,
          to: String,
          Component: myComponent,
          permissions: Object[]
        }]
    )
  }
}

# Injection Zones API

Injection zones refer to areas of a view's layout where a plugin allows another to inject a custom React component (e.g. a UI element like a button).

Plugins can use:

✏️ NOTE

Injection zones are defined in the register() lifecycle but components are injected in the bootstrap() lifecycle.

# Using predefined injection zones

Strapi admin panel comes with predefined injection zones so components can be added to the UI of the Content Manager:

View Injection zone name & Location
List view
  • actions: sits between Filters and the cogs icon
  • deleteModalAdditionalInfos(): sits at the bottom of the modal displayed when deleting items
Edit view
  • informations: sits at the top right of the edit view
  • right-links: sits between "Configure the view" and "Edit" buttons

# Creating a custom injection zone

To create a custom injection zone, declare it as a <InjectionZone /> React component with an area prop that takes a string with the following naming convention: plugin-name.viewName.injectionZoneName.

# Injecting components

A plugin has 2 different ways of injecting a component:

  • to inject a component from a plugin into another plugin's injection zones, use the injectComponent() function
  • to specifically inject a component into one of the Content Manager's predefined injection zones, use the injectContentManagerComponent() function instead

Both the injectComponent() and injectContentManagerComponent() methods accept the following arguments:

Argument Type Description
first argument String The view where the component is injected
second argument String The zone where the component is injected
third argument Object An object with the following keys:
  • name (string): the name of the component
  • Component (function or class): the React component to be injected
Example: Inject a component in the informations box of the Edit View of the Content Manager: 
// path: my-plugin/admin/src/index.js

export default {
  bootstrap(app) {
    app.injectContentManagerComponent('editView', 'informations', {
      name: 'my-plugin-my-compo',
      Component: () => 'my-compo',
    });
  }
}
Example: Creating a new injection zone and injecting it from a plugin to another one: 
// Use the injection zone in a view
// path: my-plugin/admin/src/injectionZones.js

import { InjectionZone } from '@strapi/helper-plugin';

const HomePage = () => {
  return (
    <main>
      <h1>This is the homepage</h1>
	    <InjectionZone area="my-plugin.homePage.right" />
    </main>
  );
};

// Declare this injection zone in the register lifecycle of the plugin
// path: my-plugin/admin/src/index.js

export default {
  register() {
    app.registerPlugin({
      // ...
      injectionZones: {
        homePage: {
          right: []
        }
      }
    });
  },
}

// Inject the component from a plugin in another plugin
// path: my-other-plugin/admin/src/index.js

export default {
  register() {
    // ...
  },
  bootstrap(app) {
    app.getPlugin('my-plugin').injectComponent('homePage', 'right', {
      name: 'my-other-plugin-component',
      Component: () => 'This component is injected',
    });
  }
};

# Accessing data with the useCMEditViewDataManager React hook

Once an injection zone is defined, the component to be injected in the Content Manager can have access to all the data of the Edit View through the useCMEditViewDataManager React hook.

Example of a basic component using the 'useCMEditViewDataManager' hook 
import { useCMEditViewDataManager } from '@strapi/helper-plugin';

const MyCompo = () => {
  const {
    createActionAllowedFields: [], // Array of fields that the user is allowed to edit
    formErrors: {}, // Object errors
    readActionAllowedFields: [], // Array of field that the user is allowed to edit
    slug: 'api::address.address', // Slug of the content-type
    updateActionAllowedFields: [],
    allLayoutData: {
      components: {}, // components layout
      contentType: {}, // content-type layout
    },
    initialData: {},
    isCreatingEntry: true,
    isSingleType: true,
    status: 'resolved',
    layout: {}, // Current content-type layout
    hasDraftAndPublish: true,
    modifiedData: {},
    onPublish: () => {},
    onUnpublish: () => {},
    addComponentToDynamicZone: () => {},
    addNonRepeatableComponentToField: () => {},
    addRelation: () => {},
    addRepeatableComponentToField: () => {},
    moveComponentDown: () => {},
    moveComponentField: () => {},
    moveComponentUp: () => {},
    moveRelation: () => {},
    onChange: () => {},
    onRemoveRelation: () => {},
    removeComponentFromDynamicZone: () => {},
    removeComponentFromField: () => {},
    removeRepeatableField: () => {},
  } = useCMEditViewDataManager()

  return null
}

# Reducers API

Reducers are Redux (opens new window) reducers that can be used to share state between components. Reducers can be useful when:

  • Large amounts of application state are needed in many places in the application.
  • The application state is updated frequently.
  • The logic to update that state may be complex.

Reducers can be added to a plugin interface with the addReducers() function during the register lifecycle.

A reducer is declared as an object with this syntax:

Example:

// path: my-plugin/admin/src/index.js
import { exampleReducer } from './reducers'

const reducers = {
  // Reducer Syntax
  [`${pluginId}_exampleReducer`]: exampleReducer
}

export default {
  register(app) {
    app.addReducers(reducers)
  },
  bootstrap() {},
};

# Hooks API

The Hooks API allows a plugin to create and register hooks, i.e. places in the application where plugins can add personalized behavior.

Hooks should be registered during the bootstrap lifecycle of a plugin.

Hooks can then be run in series, in waterfall or in parallel:

  • runHookSeries returns an array corresponding to the result of each function executed, ordered
  • runHookParallel returns an array corresponding to the result of the promise resolved by the function executed, ordered
  • runHookWaterfall returns a single value corresponding to all the transformations applied by the different functions starting with the initial value args.
Example: Create a hook in a plugin and use it in another plugin 
// path: my-plugin/admin/src/index.js
// Create a hook in a plugin
export default {
  register(app) {
    app.createHook('My-PLUGIN/MY_HOOK');
  }
}


// path: my-other-plugin/admin/src/index.js
// Use the hook in another plugin
export default {
  bootstrap(app) {
    app.registerHook('My-PLUGIN/MY_HOOK', (...args) => {
      console.log(args)

      // important: return the mutated data
      return args
    });

    app.registerPlugin({...})
  }
}

# Predefined hook

Strapi includes a predefined cm/inject-column-in-table hook that can be used to add or mutate a column of the List View of the Content Manager.

Example: 'cm/inject-column-in-table' hook, as used by the Internationalization plugin to add the 'Content available in' column 
// ./plugins/my-plugin/admin/src/index.js

export default {
  bootstrap(app) {
	  app.registerHook('cm/inject-column-in-table', ({ displayedHeaders, layout }) => {
			const isFieldLocalized = get(layout, 'contentType.pluginOptions.i18n.localized', false);

			if (!isFieldLocalized) {
			  return displayedHeaders;
			}

			return [
			  ...displayedHeaders,
			  {
			    key: '__locale_key__', // Needed for the table
			    fieldSchema: { type: 'string' }, // Schema of the attribute
			    metadatas: {
						label: 'Content available in', // Label of the header,
						sortable: false|true // Define in the column is sortable
					}, // Metadatas for the label
					// Name of the key in the data we will display
			    name: 'locales',
					// Custom renderer
			    cellFormatter: props => <div>Object.keys(props).map(key => <p key={key}>key</p>)</div>,
			  },
			];
    });
  },
}

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