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In the following page, with Firefox the remove button submits the form, but the add button does not.
How do I prevent the remove button from submitting the form?
function addItem() { var v = $('form :hidden:last').attr('name'); var n = /(.*)input/.exec(v); var newPrefix; if (n[1].length == 0) { newPrefix = '1'; } else { newPrefix = parseInt(n[1]) + 1; } var oldElem = $('form tr:last'); var newElem = oldElem.clone(true); var lastHidden = $('form :hidden:last'); lastHidden.val(newPrefix); var pat = '=\"' + n[1] + 'input'; newElem.html(newElem.html().replace(new RegExp(pat, 'g'), '=\"' + newPrefix + 'input')); newElem.appendTo('table'); $('form :hidden:last').val(''); } function removeItem() { var rows = $('form tr'); if (rows.length > 2) { rows[rows.length - 1].html(''); $('form :hidden:last').val(''); } else { alert('Cannot remove any more rows'); } }<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <html> <body> <form autocomplete="off" method="post" action=""> <p>Title:<input type="text" /></p> <button onclick="addItem(); return false;">Add Item</button> <button onclick="removeItem(); return false;">Remove Last Item</button> <table> <th>Name</th> <tr> <td><input type="text" id="input1" name="input1" /></td> <td><input type="hidden" id="input2" name="input2" /></td> </tr> </table> <input id="submit" type="submit" name="submit" value="Submit"> </form> </body> </html>
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You can check if the user clicked the back button, disable form if true. Another way is by storing a cookie which you check on page load, if it exists you can disable the form.
Use the return value of the function to stop the execution of a form in JavaScript. False would return if the form fails to submit.
You're using an HTML5 button element. Remember the reason is this button has a default behavior of submit, as stated in the W3 specification as seen here: W3C HTML5 Button
So you need to specify its type explicitly:
<button type="button">Button</button> in order to override the default submit type. I just want to point out the reason why this happens.
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