RAD Studio VCL Reference
TWebBrowser.Busy Property

Indicates whether the WebBrowser control is in the middle of a navigation or downloading operation.

property Busy: WordBool;
__property WordBool Busy;

Read Busy to determine whether the Web browser component is currently navigating to a new URL or downloading a document. If Busy is true, you can interrupt the current operation using the Stop method before starting a new operation.

Note: The Web browser receives events at the beginning and end of each operation, as well as at discrete points during a download operation.

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