Lianja Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a String

See more JavaScript Examples

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