Node.js

Call a JavaScript Function Returning an Array

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

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var sbScript = new chilkat.StringBuilder();
    success = sbScript.LoadFile("js_function_returning_array.js","utf-8");
    if (success == false) {
        console.log(sbScript.LastErrorText);
        return;
    }

    var js = new chilkat.Js();

    var result = new chilkat.JsonObject();
    result.EmitCompact = 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.
        console.log(result.Emit());

        //  Also examine the LastErrorText.
        console.log(js.LastErrorText);
        return;
    }

    //  ------------------------------------------------------------------------------
    //  Call each function

    var funcCall = new chilkat.JsonObject();

    //  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.
        console.log(result.Emit());

        //  Also examine the LastErrorText.
        console.log(js.LastErrorText);
        return;
    }

    console.log(result.Emit());

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

    //  Access each array value..
    var count = result.SizeOfArray("value");
    var i = 0;
    while (i < count) {
        result.I = i;
        console.log(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);
    console.log(result.Emit());

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

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.I = i;
        console.log(result.IntOf("value[i]"));
        i = i+1;
    }

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

    funcCall.Clear();
    funcCall.UpdateString("name","getEmployees");
    success = js.CallFunction(funcCall,result);
    console.log(result.Emit());

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

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.I = i;
        console.log("name: " + result.StringOf("value[i].name"));
        console.log("role: " + result.StringOf("value[i].role"));
        console.log("id: " + result.IntOf("value[i].id"));
        console.log("");
        i = i+1;
    }


}

chilkatExample();