react-native-webview/docs/Reference.md

React Native WebView API Reference

This document lays out the current public properties and methods for the React Native WebView.

Security Warning: Currently, onMessage and postMessage do not allow specifying an origin. This can lead to cross-site scripting attacks if an unexpected document is loaded within a WebView instance. Please refer to the MDN documentation for Window.postMessage() for more details on the security implications of this.

Props Index

• source
• automaticallyAdjustContentInsets
• injectJavaScript
• injectedJavaScript
• mediaPlaybackRequiresUserAction
• nativeConfig
• onError
• onLoad
• onLoadEnd
• onLoadStart
• onMessage
• onNavigationStateChange
• originWhitelist
• renderError
• renderLoading
• scalesPageToFit
• onShouldStartLoadWithRequest
• startInLoadingState
• style
• decelerationRate
• domStorageEnabled
• javaScriptEnabled
• mixedContentMode
• thirdPartyCookiesEnabled
• userAgent
• allowsInlineMediaPlayback
• bounces
• contentInset
• dataDetectorTypes
• scrollEnabled
• geolocationEnabled
• allowUniversalAccessFromFileURLs
• useWebKit
• url
• html

Methods Index

• extraNativeComponentConfig
• goForward
• goBack
• reload
• stopLoading

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Reference

Props

source

Loads static HTML or a URI (with optional headers) in the WebView. Note that static HTML will require setting originWhitelist to ["*"].

The object passed to source can have either of the following shapes:

Load uri

• uri (string) - The URI to load in the WebView. Can be a local or remote file.
• method (string) - The HTTP Method to use. Defaults to GET if not specified. On Android, the only supported methods are GET and POST.
• headers (object) - Additional HTTP headers to send with the request. On Android, this can only be used with GET requests.
• body (string) - The HTTP body to send with the request. This must be a valid UTF-8 string, and will be sent exactly as specified, with no additional encoding (e.g. URL-escaping or base64) applied. On Android, this can only be used with POST requests.

Static HTML

• html (string) - A static HTML page to display in the WebView.
• baseUrl (string) - The base URL to be used for any relative links in the HTML.

Type	Required
object	No

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automaticallyAdjustContentInsets

Controls whether to adjust the content inset for web views that are placed behind a navigation bar, tab bar, or toolbar. The default value is true.

Type	Required
bool	No

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injectJavaScript

Function that accepts a string that will be passed to the WebView and executed immediately as JavaScript.

Type	Required
function	No

---

injectedJavaScript

Set this to provide JavaScript that will be injected into the web page when the view loads.

Type	Required
string	No

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mediaPlaybackRequiresUserAction

Boolean that determines whether HTML5 audio and video requires the user to tap them before they start playing. The default value is true.

Type	Required
bool	No

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nativeConfig

Override the native component used to render the WebView. Enables a custom native WebView which uses the same JavaScript as the original WebView.

The nativeConfig prop expects an object with the following keys:

• component (any)
• props (object)
• viewManager (object)

Type	Required
object	No

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onError

Function that is invoked when the WebView load fails.

Type	Required
function	No

---

onLoad

Function that is invoked when the WebView has finished loading.

Type	Required
function	No

---

onLoadEnd

Function that is invoked when the WebView load succeeds or fails.

Type	Required
function	No

---

onLoadStart

Function that is invoked when the WebView starts loading.

Type	Required
function	No

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onMessage

A function that is invoked when the webview calls window.postMessage. Setting this property will inject a postMessage global into your webview, but will still call pre-existing values of postMessage.

window.postMessage accepts one argument, data, which will be available on the event object, event.nativeEvent.data. data must be a string.

Type	Required
function	No

---

onNavigationStateChange

Function that is invoked when the WebView loading starts or ends.

Type	Required
function	No

---

originWhitelist

List of origin strings to allow being navigated to. The strings allow wildcards and get matched against just the origin (not the full URL). If the user taps to navigate to a new page but the new page is not in this whitelist, the URL will be handled by the OS. The default whitelisted origins are “http://” and “https://”.

Type	Required
array of strings	No

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renderError

Function that returns a view to show if there’s an error.

Type	Required
function	No

---

renderLoading

Function that returns a loading indicator. The startInLoadingState prop must be set to true in order to use this prop.

Type	Required
function	No

---

scalesPageToFit

Boolean that controls whether the web content is scaled to fit the view and enables the user to change the scale. The default value is true.

On iOS, when useWebKit=true, this prop will not work.

Type	Required
bool	No

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onShouldStartLoadWithRequest

Function that allows custom handling of any web view requests. Return true from the function to continue loading the request and false to stop loading.

Type	Required	Platform
function	No	iOS

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startInLoadingState

Boolean value that forces the WebView to show the loading view on the first load. This prop must be set to true in order for the renderLoading prop to work.

Type	Required
bool	No

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decelerationRate

A floating-point number that determines how quickly the scroll view decelerates after the user lifts their finger. You may also use the string shortcuts "normal" and "fast" which match the underlying iOS settings for UIScrollViewDecelerationRateNormal and UIScrollViewDecelerationRateFast respectively:

• normal: 0.998
• fast: 0.99 (the default for iOS web view)

Type	Required	Platform
number	No	iOS

---

domStorageEnabled

Boolean value to control whether DOM Storage is enabled. Used only in Android.

Type	Required	Platform
bool	No	Android

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javaScriptEnabled

Boolean value to enable JavaScript in the WebView. Used on Android only as JavaScript is enabled by default on iOS. The default value is true.

Type	Required	Platform
bool	No	Android

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mixedContentMode

Specifies the mixed content mode. i.e WebView will allow a secure origin to load content from any other origin.

Possible values for mixedContentMode are:

• never (default) - WebView will not allow a secure origin to load content from an insecure origin.
• always - WebView will allow a secure origin to load content from any other origin, even if that origin is insecure.
• compatibility - WebView will attempt to be compatible with the approach of a modern web browser with regard to mixed content.

Type	Required	Platform
string	No	Android

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thirdPartyCookiesEnabled

Boolean value to enable third party cookies in the WebView. Used on Android Lollipop and above only as third party cookies are enabled by default on Android Kitkat and below and on iOS. The default value is true.

Type	Required	Platform
bool	No	Android

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userAgent

Sets the user-agent for the WebView.

Type	Required	Platform
string	No	Android

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allowsInlineMediaPlayback

Boolean that determines whether HTML5 videos play inline or use the native full-screen controller. The default value is false.

NOTE

In order for video to play inline, not only does this property need to be set to true, but the video element in the HTML document must also include the webkit-playsinline attribute.

Type	Required	Platform
bool	No	iOS

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bounces

Boolean value that determines whether the web view bounces when it reaches the edge of the content. The default value is true.

Type	Required	Platform
bool	No	iOS

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contentInset

The amount by which the web view content is inset from the edges of the scroll view. Defaults to {top: 0, left: 0, bottom: 0, right: 0}.

Type	Required	Platform
object: {top: number, left: number, bottom: number, right: number}	No	iOS

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dataDetectorTypes

Determines the types of data converted to clickable URLs in the web view’s content. By default only phone numbers are detected.

You can provide one type or an array of many types.

Possible values for dataDetectorTypes are:

• phoneNumber
• link
• address
• calendarEvent
• none
• all

With the new WebKit implementation, we have three new values:

• trackingNumber
• flightNumber
• lookupSuggestion

Type	Required	Platform
string, or array	No	iOS

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scrollEnabled

Boolean value that determines whether scrolling is enabled in the WebView. The default value is true.

Type	Required	Platform
bool	No	iOS

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geolocationEnabled

Set whether Geolocation is enabled in the WebView. The default value is false. Used only in Android.

Type	Required	Platform
bool	No	Android

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allowUniversalAccessFromFileURLs

Boolean that sets whether JavaScript running in the context of a file scheme URL should be allowed to access content from any origin. Including accessing content from other file scheme URLs. The default value is false.

Type	Required	Platform
bool	No	Android

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useWebKit

If true, use WKWebView instead of UIWebView.

Type	Required	Platform
boolean	No	iOS

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url

Deprecated. Use the source prop instead.

Type	Required
string	No

---

html

Deprecated. Use the source prop instead.

Type	Required
string	No

Methods

extraNativeComponentConfig()

static extraNativeComponentConfig()

goForward()

goForward();

Go forward one page in the web view’s history.

goBack()

goBack();

Go back one page in the web view’s history.

reload()

reload();

Reloads the current page.

stopLoading()

stopLoading();

Stop loading the current page.

Other Docs

Also check out our Getting Started Guide and In-Depth Guide.