Go Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a String

See more JavaScript Examples

Demonstrates how to call a JavaScript function that returns a string. Go

    success := false

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

    //  function greet(name) {
    //      return "Hello, " + name + "!";
    //  }

    sbScript := chilkat.NewStringBuilder()
    sbScript.Append("function greet(name) { return \"Hello, \" + name + \"!\"; }")

    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 greet("Michael")

    funcCall := chilkat.NewJsonObject()

    //  Create JSON specifying the function name and arguments

    //  {
    //    "name": "greet",
    //    "args": [ "Michael" ]
    //  }

    funcCall.UpdateString("name","greet")
    funcCall.UpdateString("args[0]","Michael")

    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": "string",
    //    "value": "Hello, Michael!"
    //  }

    retval := result.StringOf("value")
    fmt.Println(*retval)

    //  Output:
    //  Hello, Michael!

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