Title: Submit validation callback
Last modified: September 1, 2016

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# Submit validation callback

 *  Resolved [Alex Agranov](https://wordpress.org/support/users/alexagr/)
 * (@alexagr)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/)
 * I’m a developer trying to use Caldera Forms to create a registration form for
   event. Prior to submitting the form I need to be able to check whether event 
   still has free spaces available – and if not, display proper message. Is there
   some hook that would let me do this? caldera_forms_submit_transient_setup() seems
   like a good candidate – but how can I display an error message to user?
 * [https://wordpress.org/plugins/caldera-forms/](https://wordpress.org/plugins/caldera-forms/)

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [Luke Cavanagh](https://wordpress.org/support/users/lukecavanagh/)
 * (@lukecavanagh)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/#post-7573287)
 * [@alexagr](https://wordpress.org/support/users/alexagr/)
 * So where is the event availability being stored?
 * Is that stored in a custom field of an event post or somewhere else?
 *  [Luke Cavanagh](https://wordpress.org/support/users/lukecavanagh/)
 * (@lukecavanagh)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/#post-7573288)
 * You could look at this action.
 * [https://calderawp.com/doc/caldera_forms_submit_pre_process_start/](https://calderawp.com/doc/caldera_forms_submit_pre_process_start/)
 *  Plugin Author [Josh Pollock](https://wordpress.org/support/users/shelob9/)
 * (@shelob9)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/#post-7573305)
 * [@alexagr](https://wordpress.org/support/users/alexagr/)
 * Thanks for using Caldera Forms.
 * You should check out this add-on, for your needs:
    [https://calderawp.com/downloads/caldera-forms-entry-limiter/](https://calderawp.com/downloads/caldera-forms-entry-limiter/)
 * Also, please be aware we do not regularly monitor these forums. Please use our
   website [https://CalderaWP.com](https://CalderaWP.com) to contact us or get Caldera
   Forms support.
 *  Thread Starter [Alex Agranov](https://wordpress.org/support/users/alexagr/)
 * (@alexagr)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/#post-7573325)
 * Thank you very much.

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Submit validation callback’ is closed to new replies.

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## Tags

 * [hook](https://wordpress.org/support/topic-tag/hook/)
 * [submit](https://wordpress.org/support/topic-tag/submit/)

 * 4 replies
 * 3 participants
 * Last reply from: [Alex Agranov](https://wordpress.org/support/users/alexagr/)
 * Last activity: [9 years, 11 months ago](https://wordpress.org/support/topic/submit-validation-callback/#post-7573325)
 * Status: resolved