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Showing content from https://cefsharp.github.io/api/118.6.x/html/M_CefSharp_ILifeSpanHandler_OnBeforePopup.htm below:

Called before a popup window is created. By default the popup (browser) is created in a new native window.

CefSharp (in CefSharp.dll) Version: 118.6.80.0 (118.6.80.0)

bool OnBeforePopup(
	IWebBrowser chromiumWebBrowser,
	IBrowser browser,
	IFrame frame,
	string targetUrl,
	string targetFrameName,
	WindowOpenDisposition targetDisposition,
	bool userGesture,
	IPopupFeatures popupFeatures,
	IWindowInfo windowInfo,
	IBrowserSettings browserSettings,
	ref bool noJavascriptAccess,
	out IWebBrowser newBrowser
)

bool OnBeforePopup(
	IWebBrowser^ chromiumWebBrowser, 
	IBrowser^ browser, 
	IFrame^ frame, 
	String^ targetUrl, 
	String^ targetFrameName, 
	WindowOpenDisposition targetDisposition, 
	bool userGesture, 
	IPopupFeatures^ popupFeatures, 
	IWindowInfo^ windowInfo, 
	IBrowserSettings^ browserSettings, 
	bool% noJavascriptAccess, 
	[OutAttribute] IWebBrowser^% newBrowser
)

chromiumWebBrowser

Type: CefSharpIWebBrowser
the ChromiumWebBrowser control

browser

Type: CefSharpIBrowser
The browser instance that launched this popup.

frame

Type: CefSharpIFrame
The HTML frame that launched this popup.

targetUrl

Type: SystemString
The URL of the popup content. (This may be empty/null)

targetFrameName

Type: SystemString
The name of the popup. (This may be empty/null)

targetDisposition

Type: CefSharpWindowOpenDisposition
The value indicates where the user intended to open the popup (e.g. current tab, new tab, etc)

userGesture

Type: SystemBoolean
The value will be true if the popup was opened via explicit user gesture (e.g. clicking a link) or false if the popup opened automatically (e.g. via the DomContentLoaded event).

popupFeatures

Type: CefSharpIPopupFeatures
structure contains additional information about the requested popup window

windowInfo

Type: CefSharpIWindowInfo
window information

browserSettings

Type: CefSharpIBrowserSettings
browser settings, defaults to source browsers

noJavascriptAccess

Type: SystemBoolean
value indicates whether the new browser window should be scriptable and in the same process as the source browser.

newBrowser

Type: CefSharpIWebBrowser
EXPERIMENTAL - Low level this allows for assigning the CefClient instance associated with the new ChromiumWebBrowser instance to the CefClient param of the CefLifeSpanHandler::OnBeforeBrowser method. This allows for all the handlers, LifeSpanHandler, DisplayHandler, etc to be associated with the CefClient of the new ChromiumWebBrowser instance to be associated with the popup (browser). WPF/WinForms specific code is still required to host the popup (browser) in the new ChromiumWebBrowser instance. Set to null for default behaviour. If you return true (cancel popup creation) then his property **MUST** be null, an exception will be thrown otherwise.

Type:

By default the popup (browser) is opened in a new native window. If you return true then creation of the popup (browser) is cancelled, no further action will occur. Otherwise return false to allow creation of the popup (browser).

If you return true and set newBrowser to not null then an exception will be thrown as creation of the popup (browser) was cancelled. WinForms - To host the popup (browser) in a TAB/Custom Window see https://github.com/cefsharp/CefSharp/wiki/General-Usage#winforms---hosting-popup-using-tab-control for an easy method. WPF - For an example of hosting the popup (browser) in a custom window see https://github.com/cefsharp/CefSharp/wiki/General-Usage#wpf---hosting-popup-in-new-window-experimental Same can be applied for hosting the popup in a TAB. This method is still EXPERIMENTAL and will likely require upstream bug fixes in CEF (https://bitbucket.org/chromiumembedded/cef).

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