C#

JavaScript console

See more JavaScript Examples

Demonstrates console output using Chilkat JavaScript. C#

bool success = false;

// This example demonstrates using the built-in console object.
// The Javascript run in this example is shown below.

// Load the JavaScript from a file.
Chilkat.StringBuilder sbScript = new Chilkat.StringBuilder();
success = sbScript.LoadFile("qa_data/js_tests/test_console.js","utf-8");
if (success == false) {
    Debug.WriteLine(sbScript.LastErrorText);
    return;
}

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

// Run the JavaScript
// Results (not console output) go to result.
// Note: Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
// In this case, the last evaluated expression is console.log which does not calculate a value. Therefore, it returns undefined.
success = js.Eval(sbScript,result);
if (success == false) {
    Debug.WriteLine(sbScript.LastErrorText);
    return;
}

// We can look at the result, which is "undefined", which is normal and expected.
Debug.WriteLine(result.Emit());
// The result JSON is: {"type":"undefined","value":"undefined"}

// The console output is retrieved by calling ConsoleOutputSb
Chilkat.StringBuilder sbOut = new Chilkat.StringBuilder();
js.ConsoleOutputSb(sbOut);
Debug.WriteLine(sbOut.GetAsString());