Loads a URL into the WebView asynchronously.
@param webview The WebView instance.
@param url The URL to load.
@param frame_name The name of the frame to load the URL in; leave this blank to load in the main frame.
@param username If the URL requires authentication, the username to authorize as, otherwise just pass an empty string.
@param password If the URL requires authentication, the password to use, otherwise just pass an empty string.
See Implementation
Loads a URL into the WebView asynchronously.
@param webview The WebView instance.
@param url The URL to load.
@param frame_name The name of the frame to load the URL in; leave this blank to load in the main frame.
@param username If the URL requires authentication, the username to authorize as, otherwise just pass an empty string.
@param password If the URL requires authentication, the password to use, otherwise just pass an empty string.