Lianja

Call a JavaScript Function Returning a String

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

llSuccess = .F.

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

// function greet(name) {
//     return "Hello, " + name + "!";
// }

loSbScript = createobject("CkStringBuilder")
loSbScript.Append('function greet(name) { return "Hello, " + name + "!"; }')

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 greet("Michael")

loFuncCall = createobject("CkJsonObject")

// Create JSON specifying the function name and arguments

// {
//   "name": "greet",
//   "args": [ "Michael" ]
// }

loFuncCall.UpdateString("name","greet")
loFuncCall.UpdateString("args[0]","Michael")

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": "string",
//   "value": "Hello, Michael!"
// }

lcRetval = loResult.StringOf("value")
? lcRetval

// Output:
// Hello, Michael!


release loSbScript
release loJs
release loResult
release loFuncCall