Lianja

Call a JavaScript Function Returning an Array

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

llSuccess = .F.

// ----------------------------------------------------------------------------------
// The Javascript functions called in this example are shown at the bottom of this page.
// -----------------------------------------------------------------------------------

loSbScript = createobject("CkStringBuilder")
llSuccess = loSbScript.LoadFile("js_function_returning_array.js","utf-8")
if (llSuccess = .F.) then
    ? loSbScript.LastErrorText
    release loSbScript
    return
endif

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 each function

loFuncCall = createobject("CkJsonObject")

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

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

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": "array",
//   "value": [
//     "Monday",
//     "Tuesday",
//     "Wednesday",
//     "Thursday",
//     "Friday"
//   ]
// }

// Access each array value..
lnCount = loResult.SizeOfArray("value")
i = 0
do while i < lnCount
    loResult.I = i
    ? loResult.StringOf("value[i]")
    i = i + 1
enddo

// ------------------------------------------------------------------------------
// Call the getRange(start,end) function

loFuncCall.Clear()
loFuncCall.UpdateString("name","getRange")
loFuncCall.UpdateInt("args[0]",14)
loFuncCall.UpdateInt("args[1]",21)
llSuccess = loJs.CallFunction(loFuncCall,loResult)
? loResult.Emit()

// Output:
// {
//   "type": "array",
//   "value": [
//     14,
//     15,
//     16,
//     17,
//     18,
//     19,
//     20,
//     21
//   ]
// }

lnCount = loResult.SizeOfArray("value")
i = 0
do while i < lnCount
    loResult.I = i
    ? str(loResult.IntOf("value[i]"))
    i = i + 1
enddo

// ------------------------------------------------------------------------------
// Call the getEmployees() function

loFuncCall.Clear()
loFuncCall.UpdateString("name","getEmployees")
llSuccess = loJs.CallFunction(loFuncCall,loResult)
? loResult.Emit()

// Output:
// {
//   "type": "array",
//   "value": [
//     {
//       "id": 101,
//       "name": "Alice",
//       "role": "Dev"
//     },
//     {
//       "id": 102,
//       "name": "Bob",
//       "role": "Manager"
//     }
//   ]
// }

lnCount = loResult.SizeOfArray("value")
i = 0
do while i < lnCount
    loResult.I = i
    ? "name: " + loResult.StringOf("value[i].name")
    ? "role: " + loResult.StringOf("value[i].role")
    ? "id: " + str(loResult.IntOf("value[i].id"))
    ? ""
    i = i + 1
enddo


release loSbScript
release loJs
release loResult
release loFuncCall