Hide a dropdown value in email when a checkbox is unticked ?

Hi !
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I've an issue with checkboxes and events.
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When the checkbox is ticked, a dropdown menu apears with a selection of things, and after I can see the selected value in my email (that's what I want), but when the checkbox is unticked, the dropdown menu doesn't apears on my website (that's what I want too), but I can see the value in the hidden dropdown menu in my email (I don't want to see that).
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I've tried everything with "Events" in my checkbox settings to hide the dropdown menu value when it's unticked but it doesn't work. It's a bug ? What can I do ?
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Thank you very much.
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Cédric

Hi Cédric,
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You either need to disable the dropdown element when it is hidden (the it won't submit a value); or you can check the values after the form submits and unset any invalid values from the form data.
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Bob

Thank you Bob,
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I've tried to do this, but it doesn't work, can you tell me if something is wrong in the settings below ?
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I don't understand why it doesn't work.

Thanks,

Cédric

You can use a custom code action set to return car only and HTML / PHP code to create the email exactly how you want it, then in the email action use {var: customcodename}

Thanks healyhatman.
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But I don't understand why it works with 2 text fields and doesn't with one checkbox and one dropdown.
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This is a working exemple on my website if the value is not equal to "SUMMER2018" the "rabais" element isn't displayed in the email.
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Thank you,
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Cédric