Get Values from HTML page using SWIFT

Question

I have to retrieve all values from the following HTML page like data0, data1, data2 etc,

</head><body onload="OnLoadEvent();">
<form name="form1" action="https://products.cs.co.in/demo/jsp/cs/HResult.jsp" method="post">
    <input type="hidden" name="data0" value="7320851">
    <input type="hidden" name="data1" value="449781">
    <input type="hidden" name="data2" value="">
    <input type="hidden" name="data3" value="ACEE6F7C7">
    <input type="hidden" name="data4" value="">
    <input type="hidden" name="ref" value="">

    <input type="hidden" name="data5">
    <input type="hidden" name="result" value="">
    <input type="hidden" name="data6" value="">
    </form>
    <div align="center" class="text12">
    <br><br>
     Please do not refresh / close the window
    <br><br>
    </div>
</body>)

I am using the below swift code to retrieve all values inside Form ,

 webView.evaluateJavaScript("document.getElementsByName('form1').value") { (result, error) in
        print(result as Any)
        print(error as Any)
    }

But i am receiving nil from result variable. Kindly help on how to retrieve all values inside form using SWIFT language.

user7413163 · Accepted Answer · 2019-06-25 12:41:55Z

1

I used the following code to get all form values. It worked perfectly.

let jsCode = "" + "function parseForm(form){" +
        "var values='';" +
        "console.log('RESULT 1='+form.elements);" +
        "for(var i=0 ; i< form.elements.length; i++){" +
        "   values+=form.elements[i].name+'='+form.elements[i].value+'&'" +
        "}" +
        "return [values]" +
        "   }" +
        "for(var i=0 ; i< document.forms.length ; i++){" +
        "   parseForm(document.forms[i]);" +
    "};"


    webView.evaluateJavaScript(jsCode, completionHandler: { (result, error) in
        print(result as Any)
        print(error as Any)
        guard let resultArray = result as? [AnyObject] else { return }

    })

answered Jun 25, 2019 at 12:41

user7413163

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Comments

Code Spirit · Accepted Answer · 2019-06-12 08:48:53Z

0

The form has no value, you have to retrieve it from the children input elements. Also not that getElementsByName returns a NodeList and not a single element.

val values = {};
Array.from(document.getElementsByName("form1")[0].children).forEach(input => {
    values[input.getAttribute("name")] = input.value;
});

answered Jun 12, 2019 at 8:48

Code Spirit

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2 Comments

user7413163 Over a year ago

Thanks for your response. I need to pass this as a string in my delegate like below , webView.evaluateJavaScript("document.getElementsByName('form1').value") { (result, error) in print(result as Any) print(error as Any) } . Can you let me know how to format this to retrieve all values?

Code Spirit Over a year ago

Basically you could copy the code and paste it into single quotes. I have no experience in Swift, but I would recommend you to develop the JS seperately and test it (in the browser). Then you can minify it and store it in your swift project. Or you open the file in swift and evaluate this.

Kuldeep Chander · Accepted Answer · 2019-06-12 11:36:13Z

0

You need to add a javascript method in your HTML file that will pass form values in your swift code. You can do this with WKScriptMessageHandler.

In your HTML file, add the following code. I named it index.html and placed locally in app.

<head>
    <script type="text/javascript">
        function OnLoadEvent() {
            var test = document.getElementsByName("form1")[0].children
            var values = {};
            Array.from(test).forEach(input => {
                values[input.getAttribute("name")] = input.value;
             });
            window.webkit.messageHandlers.myApp.postMessage({values}); 
        }
    </script>
</head>

window.webkit.messageHandlers.myApp.postMessage({values}); will send from value from javascript to swift. Here myApp is a name of handler that i added in swift code.

Here is swift code

class ViewController: UIViewController, WKScriptMessageHandler {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
            let body = message.body
            if let dict = body as? Dictionary<String, AnyObject> {
                let formData = dict["values"] as! [String: AnyObject]
                for (fieldName, fieldValue) in formData {
                    print("fieldName: \(fieldName) fieldValue: \(fieldValue)")
                }
            }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        let config = WKWebViewConfiguration()
        config.userContentController.add(self, name: "myApp")
        let wkWebView = WKWebView(frame: self.view.frame, configuration: config)
        let url = Bundle.main.url(forResource: "index", withExtension: "html")!
        wkWebView.loadFileURL(url, allowingReadAccessTo: url)
        let request = URLRequest(url: url)
        wkWebView.load(request)
        self.view.addSubview(wkWebView)
    }
}

answered Jun 12, 2019 at 11:36

Kuldeep Chander

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6 Comments

user7413163 Over a year ago

Thanks for your response. But without modifying html file, i need to retrieve all values. Is it possible?

Kuldeep Chander Over a year ago

@user7413163 when you want to retrieve these values, I mean on button click or on any other event.

user7413163 Over a year ago

In Android, they are using the following code, private final String jsCode = "" + "function parseForm(form){" +"var values='';" + "for(var i=0 ; i< form.elements.length; i++){" + " values+=form.elements[i].name+'='+form.elements[i].value+'&'" +"}" + "var url=form.action;" + "console.log('parse form fired='+values);" +"window.FORMOUT.processFormData(url,values);" + " }" + "for(var i=0 ; i< document.forms.length ; i++){" + " parseForm(document.forms[i]);" + "};"; Its working fine. How to do the same in iOS?

user7413163 Over a year ago

When didFinish Event got fired, i have to retrieve all values

Kuldeep Chander Over a year ago

I add "id" tag in input field like <input type="hidden" name="data0" id="data0" value="7320851">. If you try "document.getElementById(\"data0\").value" in webView.evaluateJavaScript method then it'll return input field value. But if you use document.getElementsByName(\"form1\") then it reurn nil data.

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