Ruby

Eval JavaScript Returning String

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

require 'chilkat'

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.
sbScript = Chilkat::CkStringBuilder.new()
success = sbScript.LoadFile("js_eval_return_string.js","utf-8")
if (success == false)
    print sbScript.lastErrorText() + "\n";
    exit
end

js = Chilkat::CkJs.new()
result = Chilkat::CkJsonObject.new()

#  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)
    print js.lastErrorText() + "\n";
    exit
end

result.put_EmitCompact(false)
print result.emit() + "\n";

#  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;