Go Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a Boolean

See more JavaScript Examples

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

    success := false

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

    //  function isEven(number) {
    //      return number % 2 === 0;
    //  }

    sbScript := chilkat.NewStringBuilder()
    sbScript.Append("function isEven(number) { return number % 2 === 0; }")

    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 isEven(8)

    funcCall := chilkat.NewJsonObject()

    //  Create JSON specifying the function name and arguments

    //  {
    //    "name": "isEven",
    //    "args": [ 8 ]
    //  }

    funcCall.UpdateString("name","isEven")
    funcCall.UpdateInt("args[0]",8)

    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": "bool",
    //    "value": true
    //  }

    retval := result.BoolOf("value")
    fmt.Println(retval)

    //  Output:
    //  true

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