如何在WebView中通知我的Cocoa应用程序onClick事件？

Question

I'm loading a WebView in my OSX application and want to receive a notification in my app when the user clicks on an element in the WebView . (The WebView is loading a web page that is part of my web application.)

Is this possible?

I can think of a way to do it (poll a javascript value that gets set on the click event) but I'm hoping there's a more sensible way!

Answer 1

Since the web page is your web application, then I assume you have control over the html.

Use WebScript .

Here's a little demo:

Objective-C:

- (void)windowDidLoad{
    [[webView windowScriptObject] setValue:self forKey:@"objcConnector"];
    ....
}
+ (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector{
    if (aSelector == @selector(elementClicked:)) return NO;
    return YES;
}
-(void)elementClicked:(id)object{
    //object is the id of the element
}

HTML:

<button id="example" onClick="window.objcConnector.elementClicked_(this.id)">Click me</button>

Answer 2

Subclass NSWindow and catch the mouse down events on the WebView which is actually a WebHTMLView:

@interface MyWindow : NSWindow
@end

@implementation MyWindow

- (void)sendEvent:(NSEvent *)event
{

    if ([event type] == NSLeftMouseDown || [event type] == NSRightMouseDown)
    {
        NSView *deepView = [[self contentView] hitTest:[event locationInWindow]];
        if([[deepView className] isEqualToString:@"WebHTMLView"]){
            return;
        }
    }
    [super sendEvent:event];

}

@end

Then by monitoring the mouse over element delegate method you can track which element was clicked.

Answer 3

I think this delegate method should be useful. Open a link from the WebView would call this method, so you can figure out what to do with it.

- (void)webView:(WebView *)sender
        decidePolicyForNavigationAction:(NSDictionary *)actionInformation
        request:(NSURLRequest *)request frame:(WebFrame *)frame
        decisionListener:(id<WebPolicyDecisionListener>)listener

Or you can listen to the WebView frame change URL :

- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame 

Answer 4

Malhal's solution did not work for me in Mac OS. WebView in Mac OS is weird and wkWebView is incomplete.

Having set the first responder to the webView, this one did:

- (void)sendEvent:(NSEvent *)event
{

if ([event type] == NSLeftMouseDown || [event type] == NSRightMouseDown)
{

    if([[self.firstResponder className] isEqualToString:@"WebHTMLView"])
    {
        NSLog(@"MouseDown at: %f, %f",event.locationInWindow.x,event.locationInWindow.y);
        return;
    }
}
[super sendEvent:event];

}