I have a piece of PHP code, and I’m encountering a Confirm form resubmission error when I click the ‘Back’ button in my browser within my development environment. I’ve included the relevant code snippet below for reference:
if (!isset($_GET['auditors']) || isset($_GET['reshape'])) { /* 1st if block STARTS */
if (!isset($_GET['auditor_type']) || 'INFO' == $_GET['auditor_type']) {
if (empty($_GET['auditor_type'])) {
}
} else {
if (ValidateType($_GET['auditor_type'], $auditor_types)) {
}
else {
}
} ?>
<head>
<title>Hello World</title>
</head>
<body>
<h1>Hello World Report</h1>
<?php
<form method="get" action="">
<fieldset>
<legend>Auditors</legend>
<?php
foreach ($auditors as $id => $auditor) {
} ?>
</fieldset>
<div class="submit">
<input type="submit" name="report_maker" value="Report"/>
</div>
<fieldset>
<legend>Auditors Selected</legend>
<?php
foreach ($auditor_types as $type) {
} ?>
</fieldset>
<div class="submit">
<input type="submit" name="reshape" value="Auditors list"/>
</div>
</form>
</body>
</html>
<?php
} /* 1st if block ENDS */
Upon clicking the ‘Back’ button, the code above is executed. During debugging, I noticed that all GET variables are unset, causing it to enter the if block.
Problem Statement: After clicking ‘Back’ button, I received a Confirm form resubmission error. I’m looking for guidance on how to modify the code to resolve this issue.
Expected Result: When clicking Back button, the page should display the following headings and content inside the form:
Headings:
- Title: Hello World
- Heading: Hello World Report
- Fieldset: Auditors
- Legend: Auditors
- (Content generated by PHP loop, as shown in the code)
- Fieldset: Auditors Selected
- Legend: Auditors Selected
- (Content generated by PHP loop, as shown in the code)
Form Content:
The form should include all the inputs and elements as defined in the code snippet.
2
Answers
Clicking the back button does not reload the page, it resends the previous request. So, if the previous request was a form submission, it will try to resubmit the form. It’s that simple.
Simple workaround is to redirect the user on other page upon form submission.
Or you can display a confirmation page on a new tab.
Don’t rely on back button because it will resubmit the form.