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POHow to auto scroll a WebView after DOM changes in Cocoa / WebKit
 

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  1. POHow to auto scroll a WebView after DOM changes in Cocoa / WebKit
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    <p>I'm building a small Mac Application that gets continuously supplied with data via a web socket. After processing each data segment, the data is displayed in a <code>WebView</code>. New data <em>never replaces</em> any data in the <code>WebView</code> instead new data is always <em>appended</em> to the <code>WebView</code>'s content <em>using DOM manipulations</em>. The code sample below should give you an idea of what I'm doing.</p> <pre><code>DOMDocument *doc = self.webview.mainFrame.DOMDocument; DOMHTMLElement *container = (DOMHTMLElement *)[doc createElement:@"div"]; NSString *html = [NSString stringWithFormat:@"... omitted for the sake of brevity ... "]; [container setInnerHTML:html]; [doc.body appendChild:container]; </code></pre> <p>The rendering of the <code>WebView</code> apparently happens asynchronously. Is there a way to tell when the DOM manipulation finished and the content has been drawn? I want to use something like <code>[webview scrollToEndOfDocument:self]</code> to implement auto scrolling. Listening for DOM Events didn't help since they seem to be triggered when the DOM was modified but before these changes have been rendered. The code I'm using so far is similar to the following</p> <pre><code>[self.webview.mainFrame.DOMDocument addEventListener:@"DOMSubtreeModified" listener:self useCapture:NO]; </code></pre> <p>in conjunction with</p> <pre><code>- (void)handleEvent:(DOMEvent *)event { [self.webview scrollToEndOfDocument:self]; } </code></pre> <p>The problem with this code is that the scrolling happens too early. I'm basically always one data segment behind. Can I register for a callback / notification of any kind that is triggered when the content was drawn?</p>
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    1. COYou may try to drop all html from web view into a string and modify it. Then load this html string again.
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    2. COWhile I know that this would work, I would never use this approach for performance reasons. Part of the idea behind the DOM is to allow incremental changes. I just need a way to get notified once such a change has been committed.
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    3. COWebKit can dispatch DOM mutation events, such as `DOMSubtreeModified`, at its descretion. There's no guarantee that they'll be dispatched in a timely manner, or even dispatched at all. I think you want a solution that doesn't use mutation events. I suspect that the reason that you need to delay calling `-scrollToEndOfDocument:` is that the `WebView` will only re-layout the content as needed. If you first force it to layout by calling `-layout` on the `WebDocumentView` instance associated with the `WebFrame`, I think you'll get the result you're after.
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