How to parse data from webView to use in code

Question

I have a WKWebView in my project which does some operations, after clicking submit inWKWebView it displays JSON data in javaScript that I need to pars in my code.

Possible duplicate of [Swift Retrieve HTML data from Webview](https://stackoverflow.com/questions/33747752/swift-retrieve-html-data-from-webview) — Kuldeep, Jan 17 '19 at 12:38
@Kuldeep, did you check with OP if he is using `UIWebView` or `WKWebView`? — vikingosegundo, Jan 17 '19 at 12:43

score 2 · Answer 1 · answered Jul 04 '19 at 08:47

Swift 5.1 examples:

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("redirect didFinish")
        print(webView)
        webView.evaluateJavaScript("document.documentElement.outerHTML.toString()",
                                   completionHandler: { (html: Any?, error: Error?) in
                                    print(html as Any)
        })
    }

Talha Ahmad Khan · Answer 2 · 2019-01-18T04:30:31.563

1

You can get the HTML data in the form of string using this piece of code

in Objective C

NSString *html = [yourWebView stringByEvaluatingJavaScriptFromString: @"document.body.innerHTML"];

in Swift

let yourWebView = UIWebView();
let html : String = yourWebView.stringByEvaluatingJavaScript(from: "document.body.innerHTML") ?? "";

You have to analyze, what you have received, and do later process accordingly.

In your case, you might get the full json in the string.

edited Jan 18 '19 at 04:30

answered Jan 17 '19 at 12:36

Talha Ahmad Khan

3,416
5
23
38

1

@Mortiz sure, updated with swift. hope it will be helpful – Talha Ahmad Khan Jan 18 '19 at 04:31

score 1 · Accepted Answer · answered Jan 17 '19 at 12:37

1

You can get source code of your UIWebViewpage.

func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) {
    webView.evaluateJavaScript("document.getElementsByTagName('html')[0].innerHTML") { innerHTML, error in
        print(innerHTML!)
    }
}

answered Jan 17 '19 at 12:37

Emre

186
6

this worked with me ,,,, func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) { do{ let content = try String(contentsOf: webView.url!) if let data = content.data(using: String.Encoding.utf8) { let obj = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] } catch{ } } – Azza Jan 19 '19 at 11:56

score 1 · Answer 4 · answered Jan 17 '19 at 12:58

your JSON comes in body tag then use this code or change from web side to give JSON in body tag

if let html = webView.stringByEvaluatingJavaScript(from: "document.body.innerHTML"){

            let data = html.data(using: .utf8)!
            do {
                if let jsonArray = try JSONSerialization.jsonObject(with: data, options : .allowFragments) as? Dictionary<String,Any>
                {
                    print(jsonArray) // use the json here
                } else {
                    print("bad json")
                }
            } catch let error as NSError {
                print(error)
            }
        }

How to parse data from webView to use in code

4 Answers4