Option on submit to be added to Acymailing list

Hi,
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I found an article on the Acymailing site for how to add some custom code that will automatically add a user to an acymailing user list when they submit the form.

https://www.acyba.com/acymailing/107-acymailing-chronoform.html
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What I want to do is give an option to a user to when they submit the form , whether or not they want to be added to that list. So a radio box opt-in "Yes" , then submit.

How do I make sure that custom code is only executed when the user opts-in as YES?

Use an "event switcher". Data source something along the lines of {data:mailer-opt-in} or whatever you call it. Under the events put "0,1" (without the commas) and make sure your checkbox is returning a 0 or a 1 instead of "yes" (checked value: 1 , ghost value: 0). Makes things easier.
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Then under the "1" event you put your acymailing optin code.

Thanks very much. That worked a treat!

For anyone else wondering how to use Chronoforms to subscribe someone to an Acymailing list
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https://www.acyba.com/acymailing/106-acymailing-subscription-url.html
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Use a CURL action, leave data source empty. URL to connect to should be yoursite.com/index.php?option=com_acymailing
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Data override:

ctrl:sub
task:optin
hiddenlists:1 <-- replace this with the ID of the list you want to subscribe them to
user[email]:{data:email}
user[name]:{data:first_name} {data:last_name}

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WARNING: DO NOT copy+paste from the forums, it adds in hidden formatting codes and your CURL action won't work. TYPE IT OUT MANUALLY.