This document lays out the current public properties and methods for the React Native WebView.
source
automaticallyAdjustContentInsets
injectedJavaScript
injectedJavaScriptBeforeContentLoaded
injectedJavaScriptForMainFrameOnly
injectedJavaScriptBeforeContentLoadedForMainFrameOnly
mediaPlaybackRequiresUserAction
nativeConfig
onError
onLoad
onLoadEnd
onLoadStart
onLoadProgress
onHttpError
onMessage
onNavigationStateChange
onContentProcessDidTerminate
originWhitelist
renderError
renderLoading
scalesPageToFit
onShouldStartLoadWithRequest
startInLoadingState
style
containerStyle
decelerationRate
domStorageEnabled
javaScriptEnabled
javaScriptCanOpenWindowsAutomatically
androidHardwareAccelerationDisabled
mixedContentMode
thirdPartyCookiesEnabled
userAgent
applicationNameForUserAgent
allowsFullscreenVideo
allowsInlineMediaPlayback
bounces
overScrollMode
contentInset
contentInsetAdjustmentBehavior
dataDetectorTypes
scrollEnabled
directionalLockEnabled
geolocationEnabled
allowFileAccessFromFileURLs
allowUniversalAccessFromFileURLs
allowingReadAccessToURL
url
html
keyboardDisplayRequiresUserAction
hideKeyboardAccessoryView
allowsBackForwardNavigationGestures
incognito
allowFileAccess
saveFormDataDisabled
cacheEnabled
cacheMode
pagingEnabled
allowsLinkPreview
sharedCookiesEnabled
textZoom
ignoreSilentHardwareSwitch
onFileDownload
extraNativeComponentConfig
goForward
goBack
reload
stopLoading
injectJavaScript
clearFormData
clearCache
clearHistory
requestFocus
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, and can be changed with React state or props to navigate to a new page.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. See the Guide for more information on setting custom headers.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
Note that using static HTML requires the WebView property originWhiteList to ['*']
. For some content, such as video embeds (e.g. Twitter or Facebook posts with video), the baseUrl needs to be set for the video playback to work
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. This is also used for the origin header with CORS requests made from the WebView. See Android WebView DocsType | Required |
---|---|
object | No |
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 | Platform |
---|---|---|
bool | No | iOS |
injectedJavaScript
Set this to provide JavaScript that will be injected into the web page after the document finishes loading, but before other subresources finish loading.
Make sure the string evaluates to a valid type (true
works) and doesn’t otherwise throw an exception.
On iOS, see WKUserScriptInjectionTimeAtDocumentEnd
Type | Required | Platform |
---|---|---|
string | No | iOS, Android, macOS |
To learn more, read the Communicating between JS and Native guide.
Example:
Post message a JSON object of window.location
to be handled by onMessage
const INJECTED_JAVASCRIPT = `(function() {
window.ReactNativeWebView.postMessage(JSON.stringify(window.location));
})();`;
<WebView
source={{ uri: 'https://reactnative.dev' }}
injectedJavaScript={INJECTED_JAVASCRIPT}
onMessage={this.onMessage}
/>;
injectedJavaScriptBeforeContentLoaded
Set this to provide JavaScript that will be injected into the web page after the document element is created, but before other subresources finish loading.
Make sure the string evaluates to a valid type (true
works) and doesn’t otherwise throw an exception.
On iOS, see WKUserScriptInjectionTimeAtDocumentStart
Type | Required | Platform |
---|---|---|
string | No | iOS, macOS |
To learn more, read the Communicating between JS and Native guide.
Example:
Post message a JSON object of window.location
to be handled by onMessage
. window.ReactNativeWebView.postMessage
will be available at this time.
const INJECTED_JAVASCRIPT = `(function() {
window.ReactNativeWebView.postMessage(JSON.stringify(window.location));
})();`;
<WebView
source={{ uri: 'https://reactnative.dev' }}
injectedJavaScriptBeforeContentLoaded={INJECTED_JAVASCRIPT}
onMessage={this.onMessage}
/>;
injectedJavaScriptForMainFrameOnly
If true
(default), loads the injectedJavaScript
only into the main frame.
If false
, loads it into all frames (e.g. iframes).
Type | Required | Platform |
---|---|---|
bool | No | iOS, macOS |
injectedJavaScriptBeforeContentLoadedForMainFrameOnly
If true
(default), loads the injectedJavaScriptBeforeContentLoaded
only into the main frame.
If false
, loads it into all frames (e.g. iframes).
Warning: although support for injectedJavaScriptBeforeContentLoadedForMainFrameOnly: false
has been implemented for iOS and macOS, it is not clear that it is actually possible to inject JS into iframes at this point in the page lifecycle, and so relying on the expected behaviour of this prop when set to false
is not recommended.
Type | Required | Platform |
---|---|---|
bool | No | iOS, macOS |
mediaPlaybackRequiresUserAction
Boolean that determines whether HTML5 audio and video requires the user to tap them before they start playing. The default value is true
. (Android API minimum version 17).
NOTE: the default true
value might cause some videos to hang loading on iOS. Setting it to false
could fix this issue.
Type | Required | Platform |
---|---|---|
bool | No | iOS, Android, macOS |
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 | Platform |
---|---|---|
object | No | iOS, Android, macOS |
onError
Function that is invoked when the WebView
load fails.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onError={syntheticEvent => {
const { nativeEvent } = syntheticEvent;
console.warn('WebView error: ', nativeEvent);
}}
/>
Function passed to onError
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
code
description
didFailProvisionalNavigation
domain
loading
target
title
url
Note Domain is only used on iOS
onLoad
Function that is invoked when the WebView
has finished loading.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onLoad={syntheticEvent => {
const { nativeEvent } = syntheticEvent;
this.url = nativeEvent.url;
}}
/>
Function passed to onLoad
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
loading
target
title
url
onLoadEnd
Function that is invoked when the WebView
load succeeds or fails.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onLoadEnd={syntheticEvent => {
// update component to be aware of loading status
const { nativeEvent } = syntheticEvent;
this.isLoading = nativeEvent.loading;
}}
/>
Function passed to onLoadEnd
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
loading
target
title
url
onLoadStart
Function that is invoked when the WebView
starts loading.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev/=' }}
onLoadStart={syntheticEvent => {
// update component to be aware of loading status
const { nativeEvent } = syntheticEvent;
this.isLoading = nativeEvent.loading;
}}
/>
Function passed to onLoadStart
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
loading
target
title
url
onLoadProgress
Function that is invoked when the WebView
is loading.
Type | Required | Platform |
---|---|---|
function | No | iOS, Android, macOS |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onLoadProgress={({ nativeEvent }) => {
this.loadingProgress = nativeEvent.progress;
}}
/>
Function passed to onLoadProgress
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
loading
progress
target
title
url
onHttpError
Function that is invoked when the WebView
receives an http error.
Note Android API minimum level 23.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onHttpError={syntheticEvent => {
const { nativeEvent } = syntheticEvent;
console.warn(
'WebView received error status code: ',
nativeEvent.statusCode,
);
}}
/>
Function passed to onHttpError
is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
description
loading
statusCode
target
title
url
Note Description is only used on Android
onMessage
Function that is invoked when the webview calls window.ReactNativeWebView.postMessage
. Setting this property will inject this global into your webview.
window.ReactNativeWebView.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 |
To learn more, read the Communicating between JS and Native guide.
onNavigationStateChange
Function that is invoked when the WebView
loading starts or ends.
Type | Required |
---|---|
function | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onNavigationStateChange={navState => {
// Keep track of going back navigation within component
this.canGoBack = navState.canGoBack;
}}
/>
The navState
object includes these properties:
canGoBack
canGoForward
loading
navigationType
target
title
url
Note that this method will not be invoked on hash URL changes (e.g. from https://example.com/users#list
to https://example.com/users#help
). There is a workaround for this that is described in the Guide.
onContentProcessDidTerminate
Function that is invoked when the WebView
content process is terminated.
Type | Required | Platform |
---|---|---|
function | No | iOS and macOS WKWebView |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onContentProcessDidTerminate={syntheticEvent => {
const { nativeEvent } = syntheticEvent;
console.warn('Content process terminated, reloading', nativeEvent);
this.refs.webview.reload();
}}
/>
Function passed to onContentProcessDidTerminate is called with a SyntheticEvent wrapping a nativeEvent with these properties:
canGoBack
canGoForward
loading
target
title
url
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 | Platform |
---|---|---|
array of strings | No | iOS, Android, macOS |
Example:
//only allow URIs that begin with https:// or git://
<WebView
source={{ uri: 'https://reactnative.dev' }}
originWhitelist={['https://*', 'git://*']}
/>
renderError
Function that returns a view to show if there’s an error.
Type | Required | Platform |
---|---|---|
function | No | iOS, Android, macOS |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
renderError={errorName => <Error name={errorName} />}
/>
The function passed to renderError
will be called with the name of the error
renderLoading
Function that returns a loading indicator. The startInLoadingState prop must be set to true in order to use this prop.
Type | Required | Platform |
---|---|---|
function | No | iOS, Android, macOS |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
startInLoadingState={true}
renderLoading={() => <Loading />}
/>
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
.
Type | Required | Platform |
---|---|---|
bool | No | Android |
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.
On Android, is not called on the first load.
Type | Required | Platform |
---|---|---|
function | No | iOS, Android, macOS |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onShouldStartLoadWithRequest={request => {
// Only allow navigating within this website
return request.url.startsWith('https://reactnative.dev');
}}
/>
The request
object includes these properties:
title
url
loading
target
canGoBack
canGoForward
lockIdentifier
mainDocumentURL (iOS only)
navigationType
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 | Platform |
---|---|---|
bool | No | iOS, Android, macOS |
style
A style object that allow you to customize the WebView
style. Please note that there are default styles (example: you need to add flex: 0
to the style if you want to use height
property).
Type | Required |
---|---|
style | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
style={{ marginTop: 20 }}
/>
containerStyle
A style object that allow you to customize the WebView
container style. Please note that there are default styles (example: you need to add flex: 0
to the style if you want to use height
property).
Type | Required |
---|---|
style | No |
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
containerStyle={{ marginTop: 20 }}
/>
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:
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 |
javaScriptEnabled
Boolean value to enable JavaScript in the WebView
. The default value is true
.
Type | Required |
---|---|
bool | No |
javaScriptCanOpenWindowsAutomatically
A Boolean value indicating whether JavaScript can open windows without user interaction. The default value is false
.
Type | Required |
---|---|
bool | No |
androidHardwareAccelerationDisabled
Boolean value to disable Hardware Acceleration in the WebView
. Used on Android only as Hardware Acceleration is a feature only for Android. The default value is false
.
Type | Required | Platform |
---|---|---|
bool | No | Android |
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 |
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
. For more on cookies, read the Guide
Type | Required | Platform |
---|---|---|
bool | No | Android |
userAgent
Sets the user-agent for the WebView
.
Type | Required | Platform |
---|---|---|
string | No | iOS, Android, macOS |
applicationNameForUserAgent
Append to the existing user-agent. Setting userAgent
will override this.
Type | Required | Platform |
---|---|---|
string | No | iOS, Android, macOS |
<WebView
source={{ uri: 'https://reactnative.dev' }}
applicationNameForUserAgent={'DemoApp/1.1.0'}
/>
// Resulting User-Agent will look like:
// Mozilla/5.0 (Linux; Android 8.1.0; Android SDK built for x86 Build/OSM1.180201.021; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 DemoApp/1.1.0
// Mozilla/5.0 (iPhone; CPU iPhone OS 12_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 DemoApp/1.1.0
allowsFullscreenVideo
Boolean that determines whether videos are allowed to be played in fullscreen. The default value is false
.
Type | Required | Platform |
---|---|---|
bool | No | Android |
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 thewebkit-playsinline
attribute.
Type | Required | Platform |
---|---|---|
bool | No | iOS |
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 |
overScrollMode
Specifies the over scroll mode.
Possible values for overScrollMode
are:
always
(default) - Always allow a user to over-scroll this view, provided it is a view that can scroll.content
- Allow a user to over-scroll this view only if the content is large enough to meaningfully scroll, provided it is a view that can scroll.never
- Never allow a user to over-scroll this view.Type | Required | Platform |
---|---|---|
string | No | Android |
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 |
contentInsetAdjustmentBehavior
This property specifies how the safe area insets are used to modify the content area of the scroll view. The default value of this property is “never”. Available on iOS 11 and later. Defaults to never
.
Possible values:
automatic
scrollableAxes
never
always
Type | Required | Platform |
---|---|---|
string | No | iOS |
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
trackingNumber
flightNumber
lookupSuggestion
Type | Required | Platform |
---|---|---|
string, or array | No | iOS |
scrollEnabled
Boolean value that determines whether scrolling is enabled in the WebView
. The default value is true
. Setting this to false
will prevent the webview from moving the document body when the keyboard appears over an input.
Type | Required | Platform |
---|---|---|
bool | No | iOS and macOS |
directionalLockEnabled
A Boolean value that determines whether scrolling is disabled in a particular direction.
The default value is true
.
Type | Required | Platform |
---|---|---|
bool | No | iOS |
showsHorizontalScrollIndicator
Boolean value that determines whether a horizontal scroll indicator is shown in the WebView
. The default value is true
.
Type | Required | Platform |
---|---|---|
bool | No | iOS, Android, macOS |
showsVerticalScrollIndicator
Boolean value that determines whether a vertical scroll indicator is shown in the WebView
. The default value is true
.
Type | Required | Platform |
---|---|---|
bool | No | iOS, Android, macOS |
geolocationEnabled
Set whether Geolocation is enabled in the WebView
. The default value is false
. Used only in Android.
Type | Required | Platform |
---|---|---|
bool | No | Android |
allowFileAccessFromFileURLs
Boolean that sets whether JavaScript running in the context of a file scheme URL should be allowed to access content from other file scheme URLs. The default value is false
.
Type | Required | Platform |
---|---|---|
bool | No | iOS, Android, macOS |
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 |
allowingReadAccessToURL
A String value that indicates which URLs the WebView’s file can then reference in scripts, AJAX requests, and CSS imports. This is only used in for WebViews that are loaded with a source.uri set to a 'file://'
URL. If not provided, the default is to only allow read access to the URL provided in source.uri itself.
Type | Required | Platform |
---|---|---|
string | No | iOS and macOS |
url
Deprecated. Use the source
prop instead.
Type | Required |
---|---|
string | No |
html
Deprecated. Use the source
prop instead.
Type | Required |
---|---|
string | No |
keyboardDisplayRequiresUserAction
If false, web content can programmatically display the keyboard. The default value is true
.
Type | Required | Platform |
---|---|---|
boolean | No | iOS |
hideKeyboardAccessoryView
If true, this will hide the keyboard accessory view (< > and Done).
Type | Required | Platform |
---|---|---|
boolean | No | iOS |
allowsBackForwardNavigationGestures
If true, this will be able horizontal swipe gestures. The default value is false
.
Type | Required | Platform |
---|---|---|
boolean | No | iOS and macOS |
incognito
Does not store any data within the lifetime of the WebView.
Type | Required | Platform |
---|---|---|
boolean | No | iOS, Android, macOS |
allowFileAccess
If true, this will allow access to the file system via file://
URI’s. The default value is false
.
Type | Required | Platform |
---|---|---|
boolean | No | Android |
saveFormDataDisabled
Sets whether the WebView should disable saving form data. The default value is false
. This function does not have any effect from Android API level 26 onwards as there is an Autofill feature which stores form data.
Type | Required | Platform |
---|---|---|
boolean | No | Android |
cacheEnabled
Sets whether WebView should use browser caching.
Type | Required | Default | Platform |
---|---|---|---|
boolean | No | true | iOS, Android, macOS |
cacheMode
Overrides the way the cache is used. The way the cache is used is based on the navigation type. For a normal page load, the cache is checked and content is re-validated as needed. When navigating back, content is not revalidated, instead the content is just retrieved from the cache. This property allows the client to override this behavior.
Possible values are:
LOAD_DEFAULT
- Default cache usage mode. If the navigation type doesn’t impose any specific behavior, use cached resources when they are available and not expired, otherwise load resources from the network.LOAD_CACHE_ELSE_NETWORK
- Use cached resources when they are available, even if they have expired. Otherwise load resources from the network.LOAD_NO_CACHE
- Don’t use the cache, load from the network.LOAD_CACHE_ONLY
- Don’t use the network, load from the cache.Type | Required | Default | Platform |
---|---|---|---|
string | No | LOAD_DEFAULT | Android |
pagingEnabled
If the value of this property is true, the scroll view stops on multiples of the scroll view’s bounds when the user scrolls. The default value is false.
Type | Required | Platform |
---|---|---|
boolean | No | iOS |
allowsLinkPreview
A Boolean value that determines whether pressing on a link displays a preview of the destination for the link. In iOS this property is available on devices that support 3D Touch. In iOS 10 and later, the default value is true; before that, the default value is false.
Type | Required | Platform |
---|---|---|
boolean | No | iOS and macOS |
sharedCookiesEnabled
Set true
if shared cookies from [NSHTTPCookieStorage sharedHTTPCookieStorage]
should used for every load request in the WebView. The default value is false
. For more on cookies, read the Guide
Type | Required | Platform |
---|---|---|
boolean | No | iOS and macOS |
textZoom
If the user has set a custom font size in the Android system, an undesirable scale of the site interface in WebView occurs.
When setting the standard textZoom (100) parameter size, this undesirable effect disappears.
Type | Required | Platform |
---|---|---|
number | No | Android |
Example:
<WebView textZoom={100} />
ignoreSilentHardwareSwitch
(ios only)
When set to true the hardware silent switch is ignored. Default: false
Type | Required | Platform |
---|---|---|
boolean | No | iOS |
onFileDownload
This property is iOS-only.
Function that is invoked when the client needs to download a file.
iOS 13+ only: If the webview navigates to a URL that results in an HTTP response with a Content-Disposition header ‘attachment…’, then this will be called.
iOS 8+: If the MIME type indicates that the content is not renderable by the webview, that will also cause this to be called. On iOS versions before 13, this is the only condition that will cause this function to be called.
The application will need to provide its own code to actually download the file.
If not provided, the default is to let the webview try to render the file.
Example:
<WebView
source={{ uri: 'https://reactnative.dev' }}
onFileDownload={ ( { nativeEvent: { downloadUrl } } ) => {
// You use downloadUrl which is a string to download files however you want.
}}
/>
Type | Required | Platform |
---|---|---|
function | No | iOS |
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.
injectJavaScript(str)
injectJavaScript('... javascript string ...');
Executes the JavaScript string.
To learn more, read the Communicating between JS and Native guide.
requestFocus()
requestFocus();
Request the webView to ask for focus. (People working on TV apps might want having a look at this!)
clearFormData()
(android only)
clearFormData();
Removes the autocomplete popup from the currently focused form field, if present. developer.android.com reference
clearCache(bool)
(android only)
clearCache(true);
Clears the resource cache. Note that the cache is per-application, so this will clear the cache for all WebViews used. developer.android.com reference
clearHistory()
(android only)
clearHistory();
Tells this WebView to clear its internal back/forward list. developer.android.com reference
Also check out our Getting Started Guide and In-Depth Guide.