I have a contact form 7 form and in that I have an acceptance checkbox for terms and condition and I want to make that checkbox required and add some class when checkbox is not checked and prevent form from submission.So I tried using preventDefault().

if($("#checkbox1").hasClass("check") == false){
} else {

Now addclass line is working and for some reason preventDefault() is not working it is submitting my form everytime regardless of checkbox state.I want to make that checkobx required but I dont want to use acceptance's optional field as I dont want to disable my submit button. Any help will be helpful and thanks in advance.

  • Have you looked into using the Acceptance checkbox CF7 offers that is meant specifically for what you are trying here? contactform7.com/acceptance-checkbox
    – kraftner
    Aug 10, 2022 at 8:09
  • @kraftner, I already tried all the parameters if i use [acceptance id: acceptancecheckbox1 class:form-control-input acceptance_as_validation: on ][/acceptance] then submit button is getting disabled but if i use optional with acceptance _as_validation then form is getting submitted regardless of checkbox state .
    – RDX023
    Aug 18, 2022 at 7:21
  • 1
    @kraftner, my bad acceptance_as_validation is a additional settings. Yeah it worked I check acceptance_as_validation multiple times trying to figure out the solution but didn't see it was additional settings. Well thanks
    – RDX023
    Aug 18, 2022 at 7:49

2 Answers 2


If anyone still trying figure out the solution there is a additional settings which works like normal contact form 7 validation for other field just use acceptance_as_validation: on.


You can disable your submit button when your condition is met. That should do the job.

$('.wpcf7-form').submit(function(event) {
    var submitButton = $(this).find('input[type="submit"]');
    if ( $('#checkbox1').hasClass('check') == false ) {
        submitButton.disabled = true;
    else {
        submitButton.disabled = false;
  • I don't want to disable submit button just if acceptance is not check don't submit the form just show error that accept terms and conditions or something.
    – RDX023
    Aug 18, 2022 at 7:10

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