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.
3 answers
solution1
0 2019-06-12 08:48:53
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;
});
solution2
0 2019-06-12 11:36:13
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)
}
}
solution3
0 2019-06-25 12:41:55
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 }
})
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