Lua Requires Chilkat v11.4.0+

Eval JavaScript Returning String

See more JavaScript Examples

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

local chilkat = require("chilkat")

-- 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.
local sbScript = chilkat.StringBuilder.new()
local success = sbScript:load_file("js_eval_return_string.js", "utf-8")
if not success then
    print(sbScript.last_error_text)
    return
end

local js = chilkat.Js.new()
local result = chilkat.JsonObject.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 not success then
    print(js.last_error_text)
    return
end

result.emit_compact = false
print(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;