Go Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

See more JavaScript Examples

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

    success := false

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

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

    sbScript := chilkat.NewStringBuilder()
    sbScript.Append("function getSettings() {")
    sbScript.Append("    return {")
    sbScript.Append("        theme: \"dark\",")
    sbScript.Append("        notifications: true,")
    sbScript.Append("        version: 1.0")
    sbScript.Append("    };")
    sbScript.Append("}")

    js := chilkat.NewJs()

    result := chilkat.NewJsonObject()
    result.SetEmitCompact(false)

    //  Call Eval to add the function to the context's global object
    success = js.Eval(sbScript,result)
    if success == false {
        //  Examine the result for an exception.
        fmt.Println(*result.Emit())

        //  Also examine the LastErrorText.
        fmt.Println(js.LastErrorText())
        sbScript.DisposeStringBuilder()
        js.DisposeJs()
        result.DisposeJsonObject()
        return
    }

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

    funcCall := chilkat.NewJsonObject()

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

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

    funcCall.UpdateString("name","getSettings")

    success = js.CallFunction(funcCall,result)
    if success == false {
        //  Examine the result for an exception.
        fmt.Println(*result.Emit())

        //  Also examine the LastErrorText.
        fmt.Println(js.LastErrorText())
        sbScript.DisposeStringBuilder()
        js.DisposeJs()
        result.DisposeJsonObject()
        funcCall.DisposeJsonObject()
        return
    }

    fmt.Println(*result.Emit())

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

    //  Examine the object's members
    fmt.Println("theme: ", *result.StringOf("value.theme"))
    fmt.Println("notifications: ", *result.BoolOf("value.notifications"))
    fmt.Println("version: ", result.IntOf("value.version"))

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

    sbScript.DisposeStringBuilder()
    js.DisposeJs()
    result.DisposeJsonObject()
    funcCall.DisposeJsonObject()