Node.js

Call a JavaScript Function Returning an Object

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

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

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

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

    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 the function getSettings()

    var funcCall = new chilkat.JsonObject();

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

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

    console.log(result.Emit());

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

    // Examine the object's members
    console.log("theme: " + result.StringOf("value.theme"));
    console.log("notifications: " + result.BoolOf("value.notifications"));
    console.log("version: " + result.IntOf("value.version"));

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

}

chilkatExample();