Lianja

Call a JavaScript Function Returning an Object

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

llSuccess = .F.

// This is the JavaScript function we'll call:

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

loSbScript = createobject("CkStringBuilder")
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("CkJs")

loResult = createobject("CkJsonObject")
loResult.EmitCompact = .F.

// Call Eval to add the function to the context's global object
llSuccess = loJs.Eval(loSbScript,loResult)
if (llSuccess = .F.) then
    // Examine the result for an exception.
    ? loResult.Emit()

    // Also examine the LastErrorText.
    ? loJs.LastErrorText
    release loSbScript
    release loJs
    release loResult
    return
endif

// ------------------------------------------------------------------------------
// Call the function getSettings()

loFuncCall = createobject("CkJsonObject")

// 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")

llSuccess = loJs.CallFunction(loFuncCall,loResult)
if (llSuccess = .F.) then
    // Examine the result for an exception.
    ? loResult.Emit()

    // Also examine the LastErrorText.
    ? loJs.LastErrorText
    release loSbScript
    release loJs
    release loResult
    release loFuncCall
    return
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