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Ways to protect form from button submission

On the next page, using Firefox, removing the button submits the form, but adding the button does not.

How to 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>


P粉245276769P粉245276769418 days ago657

reply all(1)I'll reply

  • P粉908138620

    P粉9081386202023-10-11 09:42:03

    You are using the HTML5 button element. Remember, the reason is that this button has a default submit behavior, as stated in the W3 spec, as follows: W3C HTML5 Button

    So you need to specify its type explicitly: 

    <button type="button">Button</button>

    To override the default submission type. I just wanted to point out why this happens.

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