stack.md

title	icon
Creating a stack	rectangle-history-circle-plus

Creating a stack

We'll need to use 2 things to get you up and running with React Native Modalfy:

1.<ModalProvider/>, which is going to wrap the whole application and use React Context in order to display the modals on top of everything.

2. createModalStack(), that we'll use to create the stack <ModalProvider/> needs to work as expected.

Setting up the provider

> ModalProvider API

Find the app root's component and put its current content inside <ModalProvider/> as so:

{% tabs %} {% tab title="React JSX" %} {% code title="./App.js" %}

import React from 'react'
import { Text, View } from 'react-native'
import { ModalProvider } from 'react-native-modalfy'

const App = () => (
  <ModalProvider>
    <Text>Welcome to React Native!</Text>
    <Text>To get started, edit App.js</Text>
  </ModalProvider>
)

export default App

{% endcode %} {% endtab %} {% endtabs %}

You can be working on a more complex application with a lot of providers already. No worries to have here: React Native Modalfy can work wherever we render it in the app root component:

{% tabs %} {% tab title="React JSX" %} {% code title="./App.js" %}

import React from 'react'
import { Provider } from 'react-redux'
import { ApolloProvider } from 'react-apollo'
import { ModalProvider } from 'react-native-modalfy'

import Navigation from './navigation'
import reduxStore from './redux'
import client from './graphql'

const App = () => (
  <ApolloProvider client={client}>
    <Provider store={reduxStore}>
      <ModalProvider>
        <Navigation />
      </ModalProvider>
    </Provider>
  </ApolloProvider>
)

export default App

{% endcode %} {% endtab %} {% endtabs %}

{% hint style="info" %} You'll notice that we put <ModalProvider/> inside of <ApolloProvider/> and Redux's <Provider/> just in case modal components might need data from them. {% endhint %}

If we run the previous examples, we'd get an error from the library. That's because <ModalProvider/> is missing a stack of modals: let's fix that!

Configuring the stack

> createModalStack() API

For this step, we'll use createModalStack() and pass its output to <ModalProvider/> through the only prop the component accepts: stack. createModalStack() accepts 2 arguments: a modal configuration object (mandatory) and a default options object (optional):

{% tabs %} {% tab title="React JSX" %} {% code title="./App.js" %}

import React from 'react'
import { ModalProvider, createModalStack } from 'react-native-modalfy'

import Navigation from './navigation'
import ErrorModal from './components/modals/ErrorModal'

const modalConfig = { ErrorModal }
const defaultOptions = { backdropOpacity: 0.6 }

const stack = createModalStack(modalConfig, defaultOptions)

const App = () => (
  <ModalProvider stack={stack}>
    <Navigation />
  </ModalProvider>
)


export default App

{% endcode %} {% endtab %} {% endtabs %}

{% hint style="info" %} There are 3 ways to provide options to a modal:

1. Through defaultOptions in createModalStack()as we just did
2. Inside modalConfig by providing a modalOptionsobject instead of just the component directly
3. Inside the modal component file itself, via static modalOptions (Class) or MyModalComponent.modalOptions(Hooks) {% endhint %}

In this example, <ErrorModal/> is a regular React component we're using as our 1st modal. React Native Modalfy will register it under the key 'ErrorModal'.

Given that we're working with normal JavaScript objects here, you can change that key by simply changing the modalConfig key, ie: const modalConfig = { MyCustomErrorModalName: ErrorModal }.

{% hint style="info" %} We only covered the simplest way of setting up a modal stack here. Feel free to check out the createModalStack() API reference to have more in-depth explanations of createModalStack()mechanics. {% endhint %}

We now have a fully functional modal system, ready to be used and we'll see how in the following section.