Title: Callback error
Last modified: October 1, 2019

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# Callback error

 *  [Gustavo Sapienza](https://wordpress.org/support/users/gustavosapienza/)
 * (@gustavosapienza)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/callback-error-4/)
 * I Takayuki, how are you?
 * I’m working on the new callback, because the other on_sent_ok is deprecated, 
   but for me it’s giving error, it only works when I use the default of this example:
   var wpcf7Elm = document.querySelector (‘.wpcf7’); , but when I change to wpcf7Elm
   = document.querySelector (‘#wpcf7-f35-p32-o1’); returns me the error “Null”, 
   what should I do? What I need is to differentiate site forms in callback, because
   I have three forms on my site. Thank you!
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcallback-error-4%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * (@takayukister)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/callback-error-4/#post-11988096)
 * See [DOM Events](https://contactform7.com/dom-events/)

Viewing 1 replies (of 1 total)

The topic ‘Callback error’ is closed to new replies.

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## Tags

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

 * 1 reply
 * 2 participants
 * Last reply from: [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * Last activity: [6 years, 8 months ago](https://wordpress.org/support/topic/callback-error-4/#post-11988096)
 * Status: not resolved