Low Events in a Dynamic Title on a Channel Form

Question

Can I use a Low Events start date in the dynamic title on my channel form?

{exp:channel:form 
    channel="training_sessions"
    return="/mysite/training/announce-training/thank-you"
    error_handling="inline"
    secure_action="yes"
    dynamic_title="Training [training_event_details:start_date format="%Y%m%d"] [training_site_city] [training_site_state]"
}

This isn't working. I also tried removing the format="%Y%m%d" bit and it still doesn't work.

{exp:channel:form 
    channel="training_sessions"
    return="/mysite/training/announce-training/thank-you"
    error_handling="inline"
    secure_action="yes"
    dynamic_title="Training [training_event_details:start_date] [training_site_city] [training_site_state]"
}

The generated dynamic title looks like Training [training_event_details:start_date] Minneapolis MN instead of the desired Training 20150131 Minneapolis MN.

Can this be done?

Answer 1

I took a quick look, and Channel Form's dynamic_title feature is somewhat limited. It simply takes the raw entry data and does a find/replace in the title based on that data. No processing, no support for modifiers or parameters, nor some sort of rule or API to allow for that sort of thing.

That means the Low Events vars, which all use modifiers (like {events_field:start_date}), aren't supported by Channel Form.

Instead, you'd have to use JS to modify a (hidden) title field so you can add the start date to it.

Edit:

Looking at the core code, you should be able fool EE by adding a (hidden) field where you enter the start date (automatically via JS or manually), which you then use in the dynamic_title parameter. For example:

{exp:channel:form ... dynamic_title="Training [foo]"}
    <input type="hidden" name="foo" value="20140120">
{/exp:channel:form}