Visual FoxPro

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Visual FoxPro

LOCAL lnSuccess
LOCAL loSbScript
LOCAL loJs
LOCAL loResult
LOCAL loFuncCall

lnSuccess = 0

* This is the JavaScript function we'll call:

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

loSbScript = CreateObject('Chilkat.StringBuilder')
loSbScript.Append("function getSettings() {")
loSbScript.Append("    return {")
loSbScript.Append('        theme: "dark",')
loSbScript.Append("        notifications: true,")
loSbScript.Append("        version: 1.0")
loSbScript.Append("    };")
loSbScript.Append("}")

loJs = CreateObject('Chilkat.Js')

loResult = CreateObject('Chilkat.JsonObject')
loResult.EmitCompact = 0

* Call Eval to add the function to the context's global object
lnSuccess = loJs.Eval(loSbScript,loResult)
IF (lnSuccess = 0) THEN
    * Examine the result for an exception.
    ? loResult.Emit()

    * Also examine the LastErrorText.
    ? loJs.LastErrorText
    RELEASE loSbScript
    RELEASE loJs
    RELEASE loResult
    CANCEL
ENDIF

* ------------------------------------------------------------------------------
* Call the function getSettings()

loFuncCall = CreateObject('Chilkat.JsonObject')

* Create JSON specifying the function name and arguments
* The function has no arguments, so we only specify the name.

* {
*   "name": "getSettings",
* }

loFuncCall.UpdateString("name","getSettings")

lnSuccess = loJs.CallFunction(loFuncCall,loResult)
IF (lnSuccess = 0) THEN
    * Examine the result for an exception.
    ? loResult.Emit()

    * Also examine the LastErrorText.
    ? loJs.LastErrorText
    RELEASE loSbScript
    RELEASE loJs
    RELEASE loResult
    RELEASE loFuncCall
    CANCEL
ENDIF

? loResult.Emit()

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

* Examine the object's members
? "theme: " + loResult.StringOf("value.theme")
? "notifications: " + STR(loResult.BoolOf("value.notifications"))
? "version: " + STR(loResult.IntOf("value.version"))

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

RELEASE loSbScript
RELEASE loJs
RELEASE loResult
RELEASE loFuncCall