WebView.NavigationStarting 事件

定义

WebView 导航到新内容之前发生。

// Register
event_token NavigationStarting(TypedEventHandler<WebView, WebViewNavigationStartingEventArgs const&> const& handler) const;

// Revoke with event_token
void NavigationStarting(event_token const* cookie) const;

// Revoke with event_revoker
WebView::NavigationStarting_revoker NavigationStarting(auto_revoke_t, TypedEventHandler<WebView, WebViewNavigationStartingEventArgs const&> const& handler) const;
public event TypedEventHandler<WebView,WebViewNavigationStartingEventArgs> NavigationStarting;
function onNavigationStarting(eventArgs) { /* Your code */ }
webView.addEventListener("navigationstarting", onNavigationStarting);
webView.removeEventListener("navigationstarting", onNavigationStarting);
- or -
webView.onnavigationstarting = onNavigationStarting;
Public Custom Event NavigationStarting As TypedEventHandler(Of WebView, WebViewNavigationStartingEventArgs) 
<WebView NavigationStarting="eventhandler" />

事件类型

示例

下面的代码示例演示如何处理此事件以更新用作地址栏的文本框。 有关完整示例,请参阅 XAML WebView 控件示例

void webViewA_NavigationStarting(WebView sender, WebViewNavigationStartingEventArgs args)
{
    string url = "";
    try { url = args.Uri.ToString(); }
    finally
    {
        address.Text = url;
        appendLog(String.Format("Starting navigation to: \"{0}\".\n", url));
        pageIsLoading = true;
    }
}

注解

可以通过将 WebViewNavigationStartingEventArgs.Cancel 属性设置为 true 来取消此事件的处理程序中的导航。

WebView 导航事件按以下顺序发生:

对于 WebView 内容中的每个 iframe,类似事件按相同的顺序发生:

适用于

另请参阅