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This article will explain in detail how to prevent duplicate submissions in html. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

1. Disable the submit button. Use Javascript to make the submit button disable after the form is submitted. This method prevents anxious users from clicking the button multiple times. But there is a problem, if the client forbids Javascript, this method will not work.

2. Post/Redirect/Get mode. Page redirection is performed after submission, which is called Post-Redirect-Get (PRG) mode. In short, when the user submits the form, you perform a client-side redirection and go to the submission success page. This avoids the repeated submission caused by the user pressing F5, and it does not have the warning of repeated submission of the browser form, and it can also eliminate the same problem caused by pressing forward and backward by the browser.

3. Store a special logo in session. When a form page is requested, a special string of character flags is generated, stored in session, and placed in the hidden field of the form. When accepting the processing of the form data, check for the existence of the identity string, immediately delete it from the session, and then process the data normally. If you find that there is no valid tag string in the form submission, it means that the form has already been submitted and ignore this submission.

4. Add constraints to the database. Add unique constraints or create unique indexes in the database to prevent duplicate data. This is the most effective way to prevent repeated submission of data.

This is the end of the article on "how to prevent repeated submission in html". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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