使用UIWebView，DOM和Javascript在HTML文档上指向Word

Question

How can I figure out which word is at the point where the user tapped on a UIWebView ?

I am able to detect the CGPoint for the tap (subclassing UIWindow like this ), and I can actually get the DOM element on that point using javascript .

But I know very little of javascript and DOM to figure out how can I actually get which word the user tapped on.

Is that possible? Here's what I have right now:

int scrollPosition = [[webView stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue];
NSString *js = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).tagName", point.x, point.y+scrollPosition];
NSString *value = [webView stringByEvaluatingJavaScriptFromString:js];

NSLog(@"element: %@", value);

Answer 1

我不确定您将如何获得确切的单词，但是，我相信您可以在迭代它的子元素的元素中查找文本，并使用nodeType 3查找元素，即文本。

Answer 2

There was a method which I can't locate right now, which let you communicate info from UIWebView back "up" to the containing Cocoa app with some Javascript bridge. So I'd attach "click" handlers to all the elements of interest in the UIWebView, and fire some message to parent container with this magical bridge.

This assumes that you control the contents of UIWebView and can inject the needed Javascript. If this needs to work with any webpage, it's harder.