- 1 year ago
WebView2 enable to follow internal pdf links
By default, WebView2 does not automatically enable support for following internal PDF links within a PDF document loaded in the WebView control. However, you can implement a custom solution to handle internal PDF links manually. Here's a general approach to enable following internal PDF links in WebView2:
Load the PDF document: Use the WebView2 control to load the PDF document using the
Navigate
method. For example:csharpwebView.Navigate("file:///path/to/your/document.pdf");
Subscribe to navigation events: Register an event handler for the WebView2
NavigationStarting
event. This event is triggered whenever a navigation request is initiated within the WebView2 control.csharpwebView.NavigationStarting += WebView_NavigationStarting;
Handle internal PDF links: In the
WebView_NavigationStarting
event handler, inspect the navigation request and check if it is a link within the loaded PDF document. You can use theUri
property of theCoreWebView2NavigationStartingEventArgs
parameter to retrieve the navigation URL.csharpprivate void WebView_NavigationStarting(object sender, CoreWebView2NavigationStartingEventArgs e)
{
if (IsInternalPDFLink(e.Uri))
{
// Handle internal PDF link navigation
e.Cancel = true; // Cancel the navigation to prevent the WebView2 control from loading the URL
// Implement your custom logic to navigate to the specific page or location within the PDF document
}
}
In the
IsInternalPDFLink
method, you need to define the logic to identify internal PDF links based on the URL scheme or other criteria.Implement navigation logic: Within the event handler, implement the necessary logic to navigate to the specific page or location within the PDF document based on the internal link URL. You can use the
CoreWebView2.ExecuteScriptAsync
method to execute JavaScript commands within the WebView2 control to scroll to the desired page or location.csharpprivate async void WebView_NavigationStarting(object sender, CoreWebView2NavigationStartingEventArgs e)
{
if (IsInternalPDFLink(e.Uri))
{
e.Cancel = true;
await webView.ExecuteScriptAsync($"scrollToInternalLink('{GetPageNumberFromURL(e.Uri)}')");
}
}
Here,
scrollToInternalLink
is a JavaScript function that you need to define within the HTML page loaded in the WebView2 control. It should handle scrolling to the specified page or location within the PDF document.
By implementing these steps, you can manually handle internal PDF links within a PDF document loaded in the WebView2 control. Adjust the code and logic according to your specific requirements and the structure of the PDF document.