C#

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. C#

bool success = false;

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

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

Chilkat.StringBuilder 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("}");

Chilkat.Js js = new Chilkat.Js();

Chilkat.JsonObject 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.
    Debug.WriteLine(result.Emit());

    //  Also examine the LastErrorText.
    Debug.WriteLine(js.LastErrorText);
    return;
}

//  ------------------------------------------------------------------------------
//  Call the function getSettings()

Chilkat.JsonObject 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.
    Debug.WriteLine(result.Emit());

    //  Also examine the LastErrorText.
    Debug.WriteLine(js.LastErrorText);
    return;
}

Debug.WriteLine(result.Emit());

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

//  Examine the object's members
Debug.WriteLine("theme: " + result.StringOf("value.theme"));
Debug.WriteLine("notifications: " + Convert.ToString(result.BoolOf("value.notifications")));
Debug.WriteLine("version: " + Convert.ToString(result.IntOf("value.version")));

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