Xojo Plugin

Eval JavaScript Returning String

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Demonstrates getting the completion value of a JavaScript that returns a string. Xojo Plugin

Dim success As Boolean
success = False

//  This example demonstrates getting the completion value of a script,
//  where the last evaluated expression is a string.

//  The Javascript run in this example is shown below.

//  Load the JavaScript from a file.
Dim sbScript As New Chilkat.StringBuilder
success = sbScript.LoadFile("js_eval_return_string.js","utf-8")
If (success = False) Then
    System.DebugLog(sbScript.LastErrorText)
    Return
End If

Dim js As New Chilkat.Js
Dim result As New Chilkat.JsonObject

//  Run the JavaScript
//  Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
//  In this case, the last evaluated expression is a string.
success = js.Eval(sbScript,result)
If (success = False) Then
    System.DebugLog(js.LastErrorText)
    Return
End If

result.EmitCompact = False
System.DebugLog(result.Emit())

//  Output:

//  {
//    "type": "string",
//    "value": "Ready for Chilkat.Js"
//  }

JavaScript

var status = "Ready";
var system = "Chilkat.Js";

// The last statement is an expression
status + " for " + system;