Xojo Plugin

JavaScript console using Callbacks

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Demonstrates console output using Chilkat JavaScript with callbacks. Xojo Plugin

Class MyJs
    Inherits Chilkat.Js

    Sub ProgressInfo(name As String, value As String)
        System.DebugLog(name + ": " + value)
    End Sub

End Class

Dim success As Boolean
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.
Dim sbScript As New Chilkat.StringBuilder
success = sbScript.LoadFile("qa_data/js_tests/test_console.js","utf-8")
If (success = False) Then
    System.DebugLog(sbScript.LastErrorText)
    Return
End If

Dim js As New MyJs
Dim result As 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) Then
    System.DebugLog(sbScript.LastErrorText)
    Return
End If

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

// The console output is received using ProgressInfo callbacks.
// The output is:

// log: Hello World, 248, 12.05
// 
// error: foo:bar baz
// 
// warn: 1 2 3
// 
// log: %% %s
// 
// log: myApp: {
//   "appName": "Example",
//   "version": 1,
//   "isDebug": true,
//   "supportedTypes": [
//     "string",
//     "number",
//     "object"
//   ],
//   "settings": {
//     "maxWidgets": 1024,
//     "allowIO": true
//   }
// }
// 
// log: App: myApp (Version 1)
// 
// {"type":"undefined","value":"undefined"}