Swift

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

}