How to call jquery functions from Swift?

Question

The following code is how to call Javascript functions from Swift

        if let jsSourcePath = Bundle.main.path(forResource: "jssrc", ofType: "js"){
        do {
            let jsSourceContents = try String(contentsOfFile: jsSourcePath)
            self.jsContext.evaluateScript(jsSourceContents)
        }
        catch {
            print(error.localizedDescription)
        }

I thought I could do something similar for jquery. I have an identical codeblock to the one above, the only difference is I specify the official jquery library to evaluate.

I get the following error when I try to evaluate jquery.js, however.

TypeError: undefined is not an object (evaluating 'document.createElement')

Why is document.createElement resolving to undefined? Do I need to modify the class jsContext is a member of, such that the view is a WKWebView?

Dan Favano · Accepted Answer · 2019-07-05 00:06:40Z

3

Document refers to document object model or DOM. Since your Swift view is not a web page there is no DOM so this is why its undefined. I think you can call Javascript functions from Swift but once the Javascript function relies on the DOM and manipulating HTML in the DOM I think this is where you will have issues in Swift.

answered Jul 5, 2019 at 0:06

Dan Favano

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