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

JavaScript

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}