(Visual FoxPro) JavaScript console using Callbacks

See more JavaScript Examples

Note: This example requires Chilkat v11.4.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loSbScript
LOCAL loJs
LOCAL loResult

lnSuccess = 0

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

* Load the JavaScript from a file.
loSbScript = CreateObject('Chilkat.StringBuilder')
lnSuccess = loSbScript.LoadFile("qa_data/js_tests/test_console.js","utf-8")
IF (lnSuccess = 0) THEN
    ? loSbScript.LastErrorText
    RELEASE loSbScript
    CANCEL
ENDIF

loJs = CreateObject('Chilkat.Js')
jsEventHandler = CreateObject("jsEvents")
EventHandler(loJs,jsEventHandler)
loResult = CreateObject('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.
lnSuccess = loJs.Eval(loSbScript,loResult)
IF (lnSuccess = 0) THEN
    ? loSbScript.LastErrorText
    RELEASE loSbScript
    RELEASE loJs
    RELEASE loResult
    CANCEL
ENDIF

* We can look at the result, which is "undefined", which is normal and expected.
? loResult.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"}

RELEASE loSbScript
RELEASE loJs
RELEASE loResult

DEFINE CLASS jsEvents AS SESSION OLEPUBLIC
IMPLEMENTS _IChilkatEvents IN "Chilkat.Js"

PROCEDURE _IChilkatEvents_AbortCheck(abort As Number)
    * Application code goes here...

ENDPROC

PROCEDURE _IChilkatEvents_BinaryData(data As Variant)
    * Application code goes here...

ENDPROC

PROCEDURE _IChilkatEvents_PercentDone(pctDone As Number, abort As Number)
    * Application code goes here...

ENDPROC

PROCEDURE _IChilkatEvents_ProgressInfo(name As String, value As String)
    * Application code goes here...
    ? name + ": " + value
ENDPROC

PROCEDURE _IChilkatEvents_TaskCompleted(task As Generic)
    * Application code goes here...

ENDPROC

PROCEDURE _IChilkatEvents_TextData(data As String)
    * Application code goes here...

ENDPROC


ENDDEFINE

// Chilkat Js console emits CRLF line endings on Windows, and LF line endings on non-Windows.

console.log("Hello %s, %d, %f", "World", 248, 12.05);
// Output: Hello World, 248, 12.05

// If there are more arguments than the number of specifiers, the extra arguments are output, separated by spaces:
console.error('%s:%s', 'foo', 'bar', 'baz');
// Output: foo:bar baz

// If the first argument does not contain a valid format specifier, outputs a string that is the concatenation of all arguments separated by spaces:
console.warn(1,2,3);
// Output: 1 2 3

//If only one argument is passed, it is returned as it is without any formatting:
console.log("%% %s");
// Output: %% %s

const myApp = {
    appName: "Example",
    version: 1.0,
    isDebug: true,
    supportedTypes: ["string", "number", "object"],
    settings: {
       "maxWidgets": 1024,
        allowIO: true
    }
};

// %O: Emits the same as JSON.stringify(myConfig, null, 2)
console.log("myApp: %O", myApp);
// Output:
// myApp: {
//   "appName": "Example",
//   "version": 1,
//   "isDebug": true,
//   "supportedTypes": [
//     "string",
//     "number",
//     "object"
//   ],
//   "settings": {
//     "maxWidgets": 1024,
//     "allowIO": true
//   }
// }

console.log("App: %s (Version %d)", myApp.appName, myApp.version);
// Output: App: Example (Version 1)