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I have a basic foo.html in my iOS 10 application. The markup is straight forward:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<p>Hello, World!</p>
<div id="container"></div>
</body>
<script type="text/javascript" src="bar.js"></script>
<script type="text/javascript">
// Bar is defined in bar.js
var bar = new Bar();
</script>
</html>
I load it with the following:
let htmlFile = Bundle.main.path(forResource: "foo", ofType: "html")
let html = try? String(contentsOfFile: htmlFile!, encoding: String.Encoding.utf8)
webView.loadHTMLString(html!, baseURL: nil)
In my iOS app, I'm trying to access the bar variable. After the DOM is loaded as confirmed by by WKNavigationDelegate's method: func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!)
I have code like this:
var htmlContent : String {
var s = "console.log(bar)"
return s
}
webView.evaluateJavaScript(htmlContent, completionHandler: { result, error in
if let error = error {
print("error: \(error)")
}
if let result = result {
print("result: \(result)")
}
})
I end up getting an error:
error: Error Domain=WKErrorDomain Code=4 "A JavaScript exception occurred" UserInfo={WKJavaScriptExceptionLineNumber=1, WKJavaScriptExceptionMessage=ReferenceError: Can't find variable: Bar, WKJavaScriptExceptionSourceURL=about:blank, NSLocalizedDescription=A JavaScript exception occurred, WKJavaScriptExceptionColumnNumber=47}
Is what I'm trying to do possible? Do I have to approach the problem a different way? Does evaluateJavaScript have access to the scope of my DOM after it's loaded because as of right now, it seems it does not.
646
I figured it out - will put the answer here hoping it helps someone else:
The problem was here:
webView.loadHTMLString(html!, baseURL: nil)
I had to ensure baseURL is not nil, the following fixes it:
webView.loadHTMLString(html!, baseURL: Bundle.main.bundleURL)
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