Ruby Requires Chilkat v11.4.0+

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Ruby

require 'chilkat'

success = false

#  This is the JavaScript function we'll call:

#  function getSettings() {
#      return {
#          theme: "dark",
#          notifications: true,
#          version: 1.0
#      };
#  }

sbScript = Chilkat::CkStringBuilder.new()
sbScript.Append("function getSettings() {")
sbScript.Append("    return {")
sbScript.Append("        theme: \"dark\",")
sbScript.Append("        notifications: true,")
sbScript.Append("        version: 1.0")
sbScript.Append("    };")
sbScript.Append("}")

js = Chilkat::CkJs.new()

result = Chilkat::CkJsonObject.new()
result.put_EmitCompact(false)

#  Call Eval to add the function to the context's global object
success = js.Eval(sbScript,result)
if (success == false)
    #  Examine the result for an exception.
    print result.emit() + "\n";

    #  Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

#  ------------------------------------------------------------------------------
#  Call the function getSettings()

funcCall = Chilkat::CkJsonObject.new()

#  Create JSON specifying the function name and arguments
#  The function has no arguments, so we only specify the name.

#  {
#    "name": "getSettings",
#  }

funcCall.UpdateString("name","getSettings")

success = js.CallFunction(funcCall,result)
if (success == false)
    #  Examine the result for an exception.
    print result.emit() + "\n";

    #  Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

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

#  Output:
#  {
#    "type": "object",
#    "value": {
#      "theme": "dark",
#      "notifications": true,
#      "version": 1
#    }
#  }

#  Examine the object's members
print "theme: " + result.stringOf("value.theme") + "\n";
print "notifications: " + result.BoolOf("value.notifications").to_s() + "\n";
print "version: " + result.IntOf("value.version").to_s() + "\n";

#  Output:
#  theme: dark
#  notifications: True
#  version: 1