Go

Call a JavaScript Function Returning an Array

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

    success := false

    //  ----------------------------------------------------------------------------------
    //  The Javascript functions called in this example are shown at the bottom of this page.
    //  -----------------------------------------------------------------------------------

    sbScript := chilkat.NewStringBuilder()
    success = sbScript.LoadFile("js_function_returning_array.js","utf-8")
    if success == false {
        fmt.Println(sbScript.LastErrorText())
        sbScript.DisposeStringBuilder()
        return
    }

    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 each function

    funcCall := chilkat.NewJsonObject()

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

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

    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": "array",
    //    "value": [
    //      "Monday",
    //      "Tuesday",
    //      "Wednesday",
    //      "Thursday",
    //      "Friday"
    //    ]
    //  }

    //  Access each array value..
    count := result.SizeOfArray("value")
    i := 0
    for i < count {
        result.SetI(i)
        fmt.Println(*result.StringOf("value[i]"))
        i = i + 1
    }

    //  ------------------------------------------------------------------------------
    //  Call the getRange(start,end) function

    funcCall.Clear()
    funcCall.UpdateString("name","getRange")
    funcCall.UpdateInt("args[0]",14)
    funcCall.UpdateInt("args[1]",21)
    success = js.CallFunction(funcCall,result)
    fmt.Println(*result.Emit())

    //  Output:
    //  {
    //    "type": "array",
    //    "value": [
    //      14,
    //      15,
    //      16,
    //      17,
    //      18,
    //      19,
    //      20,
    //      21
    //    ]
    //  }

    count = result.SizeOfArray("value")
    i = 0
    for i < count {
        result.SetI(i)
        fmt.Println(result.IntOf("value[i]"))
        i = i + 1
    }

    //  ------------------------------------------------------------------------------
    //  Call the getEmployees() function

    funcCall.Clear()
    funcCall.UpdateString("name","getEmployees")
    success = js.CallFunction(funcCall,result)
    fmt.Println(*result.Emit())

    //  Output:
    //  {
    //    "type": "array",
    //    "value": [
    //      {
    //        "id": 101,
    //        "name": "Alice",
    //        "role": "Dev"
    //      },
    //      {
    //        "id": 102,
    //        "name": "Bob",
    //        "role": "Manager"
    //      }
    //    ]
    //  }

    count = result.SizeOfArray("value")
    i = 0
    for i < count {
        result.SetI(i)
        fmt.Println("name: ", *result.StringOf("value[i].name"))
        fmt.Println("role: ", *result.StringOf("value[i].role"))
        fmt.Println("id: ", result.IntOf("value[i].id"))
        fmt.Println("")
        i = i + 1
    }


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

JavaScript

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}