you can enable the send withdrawal of the form (like in gmail) and abort the submission. Add this code to functions.php ref. https://wordpress.org/support/topic/withdrawal-button/
Category: Blog
Blog / Contact form 7
Image preview
This is an example created some times ago for a support question into contact form 7 support forum, but could be very useful in order to show the uploaded images into a form with a input type file. ref. https://wordpress.org/support/topic/image-upload-preview-before-submit/ Example 2 This is another example that check the image size to be less than […]
Blog / Contact form 7
How exclude a day (jQuery datepicker + Contact Form 7)
ref. https://wordpress.org/support/topic/how-to-disable-exclude-specific-day-in-date-picker
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