Lianja Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a Boolean

See more JavaScript Examples

Demonstrates how to call a JavaScript function that returns a boolean. Lianja

llSuccess = .F.

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

//  function isEven(number) {
//      return number % 2 === 0;
//  }

loSbScript = createobject("CkStringBuilder")
loSbScript.Append("function isEven(number) { return number % 2 === 0; }")

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 isEven(8)

loFuncCall = createobject("CkJsonObject")

//  Create JSON specifying the function name and arguments

//  {
//    "name": "isEven",
//    "args": [ 8 ]
//  }

loFuncCall.UpdateString("name","isEven")
loFuncCall.UpdateInt("args[0]",8)

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": "bool",
//    "value": true
//  }

llRetval = loResult.BoolOf("value")
? str(llRetval)

//  Output:
//  .T.


release loSbScript
release loJs
release loResult
release loFuncCall