C#

Call a JavaScript Function Returning an Object

See more JavaScript Examples

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