Swift Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Swift

func chilkatTest() {
    var success: Bool = false

    //  This is the JavaScript function we'll call:

    //  function getSettings() {
    //      return {
    //          theme: "dark",
    //          notifications: true,
    //          version: 1.0
    //      };
    //  }

    let sbScript = CkoStringBuilder()!
    sbScript.append(value: "function getSettings() {")
    sbScript.append(value: "    return {")
    sbScript.append(value: "        theme: \"dark\",")
    sbScript.append(value: "        notifications: true,")
    sbScript.append(value: "        version: 1.0")
    sbScript.append(value: "    };")
    sbScript.append(value: "}")

    let js = CkoJs()!

    let result = CkoJsonObject()!
    result.emitCompact = false

    //  Call Eval to add the function to the context's global object
    success = js.eval(jscript: sbScript, result: result)
    if success == false {
        //  Examine the result for an exception.
        print("\(result.emit()!)")

        //  Also examine the LastErrorText.
        print("\(js.lastErrorText!)")
        return
    }

    //  ------------------------------------------------------------------------------
    //  Call the function getSettings()

    let funcCall = CkoJsonObject()!

    //  Create JSON specifying the function name and arguments
    //  The function has no arguments, so we only specify the name.

    //  {
    //    "name": "getSettings",
    //  }

    funcCall.updateString(jsonPath: "name", value: "getSettings")

    success = js.callFunction(func: funcCall, result: result)
    if success == false {
        //  Examine the result for an exception.
        print("\(result.emit()!)")

        //  Also examine the LastErrorText.
        print("\(js.lastErrorText!)")
        return
    }

    print("\(result.emit()!)")

    //  Output:
    //  {
    //    "type": "object",
    //    "value": {
    //      "theme": "dark",
    //      "notifications": true,
    //      "version": 1
    //    }
    //  }

    //  Examine the object's members
    print("theme: \(result.string(of: "value.theme")!)")
    print("notifications: \(result.bool(of: "value.notifications"))")
    print("version: \(result.int(of: "value.version").intValue)")

    //  Output:
    //  theme: dark
    //  notifications: True
    //  version: 1

}