How Can I Intercept and Halt a Form Submission Without Modifying the Submit Button?

Intervening Form Submissions

You have a form with a submit button and the need to intercept and halt its submission. This query delves into strategies to achieve this goal despite limitations on modifying the submit button.

To effectively control the submission, you'll need a combination of techniques. First, incorporate return false into the event handler to explicitly prevent the default form submission. However, this alone is insufficient, as unexpected JavaScript errors can circumvent the return statement.

Supplement return false with preventDefault() to ensure the form's default action is always blocked, even in the face of errors. The following code snippet illustrates this approach:

function mySubmitFunction(e) {
  e.preventDefault();
  someBug();
  return false;
}

Alternatively, a try...catch block provides a failsafe mechanism:

function mySubmit(e) { 
  e.preventDefault(); 
  try {
   someBug();
  } catch (e) {
   throw new Error(e.message);
  }
  return false;
}

This ensures that the form submission is blocked even if the someBug() function encounters an error. By utilizing these techniques, you can effectively prevent form submissions and maintain control over the user experience.

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