iOS10 WKWebview - evaluateJavaScript("document.height") return nil

Question

In my app, I need to get the height of a webpage in a WKWebView. So I use the code below.

webView.evaluateJavaScript(("document.height"), completionHandler: { contentHeight,error in
    print(contentHeight)
})

Until iOS 9, this returns the webpage height correctly. But in iOS 10, contentHeight is always nil.

I've set

webView.scrollView.scrollEnabled = false

and the web view is in a UITableViewCell.

The height of webView and of the UITableViewCell are variable. There's a top and bottom constraint on the web view to fit to the cell.

When I get the webpage height, I want it to be reflected in the cell's height.

I'm facing this problem as well, my current workaround is to use its contentSize.height, for now. — wint, Sep 18 '16 at 03:20

score 9 · Answer 1 · edited May 23 '17 at 12:09

9

try this:

let javascriptString = "" +
            "var body = document.body;" +
            "var html = document.documentElement;" +
            "Math.max(" +
            "   body.scrollHeight," +
            "   body.offsetHeight," +
            "   html.clientHeight," +
            "   html.offsetHeight" +
        ");"

    webView.evaluateJavaScript(javascriptString) { (result, error) in
        if error == nil {
            if let result = result, let height = JSON(result).int {
                self.htmlContentHeight = CGFloat(height)
                self.resetContentCell()
            }
        }
    }

PS. WKWebiew rendering problem: WKWebView not rendering correctly in iOS 10

edited May 23 '17 at 12:09

Community

1
1

answered Sep 18 '16 at 04:53

orazz

2,178
2
15
16

Thank you for reply! I can get height of webpage! But if I set WKWebview.scrollView.scrollEnabled = false , I can't get height. Do you know some ideas? – nicoJN Sep 18 '16 at 09:45
I have the same problem. Maybe this will help you: http://stackoverflow.com/a/39556938 – orazz Sep 18 '16 at 12:00

score 0 · Answer 2 · edited Oct 25 '16 at 05:00

0

You can try using

webView.evaluateJavaScript(("document.body.offsetHeight"), completionHandler:^(id _Nullable result, NSError * _Nullable error) {
    NSLog(@">>>%@",result);
})

edited Oct 25 '16 at 05:00

K Scandrett

16,390
4
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answered Oct 25 '16 at 01:26

MR.Shan

1

iOS10 WKWebview - evaluateJavaScript("document.height") return nil

2 Answers2

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