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I am working on a web application where I dynamically add rows to an HTML form using JavaScript. Each row contains multiple input fields like account, debtor, and creditor. After submitting the form, I process the submitted data in PHP.

The issue arises specifically with the last dynamic row. Only the first input field (account[]) of the last row is read correctly, while the other fields (debtor[] and creditor[]) are either missing or not recognized.

For example: If I have 10 dynamic rows, the first 9 rows are processed correctly, and all their fields appear properly in the output of var_dump. However, for the last row, only the value of the first field (account[]) is read, while the other fields (debtor[] and creditor[]) are not detected. However, when I add a new dynamic row and submit the form, the script throws an error:

An error occurred while processing data. Please try again.

This issue seems to arise because the arrays in the POST request (account, debtor, creditor, description, and acc_serial) have mismatched counts.

What I've tried:

PHP server-side validation

I added a validation step to ensure that all arrays (account, debtor, creditor, description, and acc_serial) have the same count:

$account = $_POST["account"];
$debtor = $_POST["debtor"];
$creditor = $_POST["creditor"];
$description = $_POST["description"];
$acc_serial = $_POST["acc_serial"];

if (
    count($_POST['account']) !== count($_POST['debtor']) || 
    count($_POST['account']) !== count($_POST['creditor']) || 
    count($_POST['account']) !== count($_POST['description']) || 
    count($_POST['account']) !== count($_POST['acc_serial'])
) {
    echo '<script>toastr.error("Mismatched field count. Please verify the data.");</script>';
    exit;
}

This triggers the error message when the counts don't match.

Debugging POST data

I used var_dump($_POST) to inspect the submitted data. Here's the output for a problematic request:

  'account' => 
    array (size=3)
      0 => string 'd59f127d86' (length=10)
      1 => string 'd5a05ca920' (length=10)
      2 => string 'd59fb74cb8' (length=10)
  'debtor' => 
    array (size=2)
      0 => string '2000' (length=4)
      1 => string '0' (length=1)
  'creditor' => 
    array (size=2)
      0 => string '0' (length=1)
      1 => string '1000' (length=4)
  'description' => 
    array (size=2)
      0 => string 'General Expense' (length=19)
      1 => string 'General Expense' (length=19)
  'acc_serial' => 
    array (size=2)
      0 => string 'd59f127d86' (length=10)
      1 => string 'd59fb74cb8' (length=10)

Account has 3 items, while debtor, creditor, description, and acc_serial have only 2 items. In this case, each of the remaining fields — Debtor, Creditor, Description, and Account Serial Number — should have three inputs, just like the Account Name field, because I added a third dynamic row to the journal entry. However, for some reason, the input values of the dynamic fields in the third newly added row are not being read, except for the Account Name field , The following error appears as shown in the iteration loop:An error occurred while processing data. Please try again.

PHP loop for processing rows

foreach ($_POST['account'] as $index => $value) {
    if (isset($_POST['account'][$index], $_POST['debtor'][$index], $_POST['creditor'][$index], $_POST['description'][$index], $_POST['acc_serial'][$index])) {
        $account = $_POST['account'][$index];
        $debtor = $_POST['debtor'][$index];
        $creditor = $_POST['creditor'][$index];
        $description = $_POST['description'][$index];
        $acc_serial = $_POST['acc_serial'][$index];
        
        if (empty($account) || empty($description) || empty($acc_serial) || $debtor === "" || $creditor === "") {
            echo '<script>toastr.error("Please fill all fields in row ' . ($index + 1) . '");</script>';
            exit;
        }

        if (!is_numeric($debtor) || !is_numeric($creditor)) {
            echo '<script>toastr.error("Debtor and Creditor must be numeric in row ' . ($index + 1) . '");</script>';
            exit;
        }
    } else {
        echo '<script>toastr.error("An error occurred while processing data. Please try again.");</script>';
        exit;
    }
}

HTML structure for dynamic rows

<form method="POST" action="" class="row g-3 needs-validation" id="myform" enctype="multipart/form-data" novalidate>
  <!-- Input Table -->
  <table class="table" style="text-align:center;" id="dynamicAddRemove">
    <thead style="background-color:#9eeaf9;color:#055160;">
      <tr>
        <th style="border-left:2px white solid;">Account</th>
        <th style="width:10%;border-left:2px white solid;">Debit</th>
        <th style="width:10%;border-left:2px white solid;">Credit</th>
        <th style="width:10%;">Description</th>
        <th></th>
        <th>
          <button type="button" name="add" id="add-btn" class="btn btn-success">
            <i class="fas fa-plus"></i>
          </button>
        </th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>
          <select class="form-control select_account js-example-basic-single select2" name="account[]" required>
            <option value="<?php echo $_acc_serial_token; ?>"><?php echo $_account; ?></option>
            <?php
            $stmt = $con->prepare("SELECT * FROM categories WHERE parent_id != ? AND status = ? AND company = ?");
            $a = 0;
            $stmt->bind_param('iis', $a, $a, $_SESSION["company"]);
            $stmt->execute();
            $resultCategories = $stmt->get_result();
            $rows = [];
            foreach ($resultCategories as $row) {
              $rows[] = $row;
            ?>
            <option value="<?php echo htmlspecialchars(strip_tags($antiXss->xss_clean($row['acc_serial']))); ?>">
              <?php echo htmlspecialchars(strip_tags($antiXss->xss_clean($row['acc_name']))); ?>
            </option>
            <?php } ?>
            <?php $stmt->close(); ?>
          </select>
        </td>
        <td>
          <input type="text" style="max-width: 94px;" onkeypress="return event.charCode >= 48 && event.charCode <= 57" 
          onpaste="return false" name="debtor[]" value="<?php echo $_debtor; ?>" class="form-control debtor" required>
        </td>
        <td>
          <input type="text" style="max-width: 94px;" onkeypress="return event.charCode >= 48 && event.charCode <= 57" 
          onpaste="return false" name="creditor[]" value="<?php echo $_creditor; ?>" class="form-control creditor" required>
        </td>
        <td>
          <input type="text" name="description[]" value="<?php echo $_description; ?>" style="min-width: 205px;" 
          class="form-control" required>
        </td>
        <td>
          <input name="acc_serial[]" class="form-control acc_serial" type="hidden" value="<?php echo $_acc_serial_token; ?>" required>
        </td>
        <td>
          <button type="button" name="add" class="btn btn-danger remove-tr">
            <i class="fas fa-trash"></i>
          </button>
        </td>
      </tr>
    </tbody>
    <!-- Totals Row -->
    <tr>
      <td style="color:#055160;"><strong>Total</strong></td>
      <td style="background-color:#9eeaf9;color:#055160;">
        <input type="text" style="max-width: 94px;border:0;" name="sum1" id="sum1" class="form-control sum1" readonly>
      </td>
      <td style="background-color:#9eeaf9;color:#055160;">
        <input type="text" style="max-width: 94px;border:0;" name="sum2" id="sum2" class="form-control sum2" readonly>
      </td>
    </tr>
  </table>
  <!-- Hidden Data -->
  <div id="data" data-rows="<?php echo htmlspecialchars(json_encode($antiXss->xss_clean($rows))); ?>"></div>
  <!-- Save and Cancel Buttons -->
  <div class="col-md-3 float-end">
    <div class="btn-group">
      <button class="btn btn-primary add_entry" name="update_entry" type="submit">
        <i class="fa-regular fa-floppy-disk"></i> Save
      </button>
      <a href="j-entry.php" class="btn btn-secondary" data-bs-dismiss="modal">
        <i class="fa-solid fa-ban"></i> Cancel
      </a>
    </div>
  </div>
</form>

JavaScript for adding dynamic rows:

  var dataElement = document.getElementById('data');
  var data = JSON.parse(dataElement.dataset.rows);
  var product_dd = "";
  product_dd += '<select class="form-control select_acount js-example-basic-single select2" name="account[]" required>';
  product_dd += '<option value="">--Select Account--</option>';
  // Ensure that the data has been converted into a JavaScript array
  if (Array.isArray(data)) {
    // Use a loop to create options from the data
    data.forEach(function(item) {
      product_dd += '<option value="' + item.acc_serial + '">' + item.acc_name + '</option>';
    });
  } else {
    console.error("Error: Invalid data format");
  }

  product_dd += "</select>";

  var i = 0;

  $(document).ready(function() {
    // Update the sum of debtor and creditor values when the page loads
    $('.sum1').val(calcSum(".debtor").toFixed(2));
    $('.sum2').val(calcSum(".creditor").toFixed(2));
  });

  $("#add-btn").click(function() {
    ++i;
    
    $("#dynamicAddRemove").append('<tr>'+
      '<td class="td">'+product_dd+'</td>'+
      '<td class="td"><input type="text" name="debtor[' + i + ']" style="max-width: 94px;padding-left: 10px;" id="fname" class="form-control debtor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
      '<td class="td"><input type="text" name="creditor[' + i + ']" id="james" style="max-width: 94px;padding-left: 10px;" class="form-control creditor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
      '<td><input type="text" name="description[' + i + ']" style="min-width: 210px;" class="form-control" required></td>'+
      '<td><input class="form-control acc_serial" type="hidden" name="acc_serial[' + i + ']" required></td>'+
      '<td><button type="button" name="add" class="btn btn-danger remove-tr"><i class="fas fa-trash"></i></button></td>'+
      '</tr>');
  });

Additional Notes:

The array notation (e.g., name="account[]") is consistent for all input fields.

The issue only occurs with rows added dynamically via JavaScript. var_dump($_POST) confirms that only the first field (account[]) of the last row is being captured, while the other fields (debtor[], creditor[]) are missing.

This issue persists regardless of the number of rows; the problem is always isolated to the last row.

What I Tried:

• Verified that all dynamically added fields are appended correctly with unique indices.
• Checked the HTML structure in the browser's developer tools to ensure no issues with element naming or structure.
• Inspected the JavaScript code responsible for adding rows, and it appears to work as intended.

My Question:

Why does this issue always occur with the last row? How can I ensure that all fields from the last dynamically added row are properly recognized and processed in PHP?

What could cause this mismatch in field counts when adding dynamic rows?

How can I debug or fix this issue to ensure all fields are submitted correctly?

I am working on a web application where I dynamically add rows to an HTML form using JavaScript. Each row contains multiple input fields like account, debtor, and creditor. After submitting the form, I process the submitted data in PHP.

The issue arises specifically with the last dynamic row. Only the first input field (account[]) of the last row is read correctly, while the other fields (debtor[] and creditor[]) are either missing or not recognized.

For example: If I have 10 dynamic rows, the first 9 rows are processed correctly, and all their fields appear properly in the output of var_dump. However, for the last row, only the value of the first field (account[]) is read, while the other fields (debtor[] and creditor[]) are not detected. However, when I add a new dynamic row and submit the form, the script throws an error:

An error occurred while processing data. Please try again.

This issue seems to arise because the arrays in the POST request (account, debtor, creditor, description, and acc_serial) have mismatched counts.

What I've tried:

PHP server-side validation

I added a validation step to ensure that all arrays (account, debtor, creditor, description, and acc_serial) have the same count:

$account = $_POST["account"];
$debtor = $_POST["debtor"];
$creditor = $_POST["creditor"];
$description = $_POST["description"];
$acc_serial = $_POST["acc_serial"];

if (
    count($_POST['account']) !== count($_POST['debtor']) || 
    count($_POST['account']) !== count($_POST['creditor']) || 
    count($_POST['account']) !== count($_POST['description']) || 
    count($_POST['account']) !== count($_POST['acc_serial'])
) {
    echo '<script>toastr.error("Mismatched field count. Please verify the data.");</script>';
    exit;
}

This triggers the error message when the counts don't match.

Debugging POST data

I used var_dump($_POST) to inspect the submitted data. Here's the output for a problematic request:

  'account' => 
    array (size=3)
      0 => string 'd59f127d86' (length=10)
      1 => string 'd5a05ca920' (length=10)
      2 => string 'd59fb74cb8' (length=10)
  'debtor' => 
    array (size=2)
      0 => string '2000' (length=4)
      1 => string '0' (length=1)
  'creditor' => 
    array (size=2)
      0 => string '0' (length=1)
      1 => string '1000' (length=4)
  'description' => 
    array (size=2)
      0 => string 'General Expense' (length=19)
      1 => string 'General Expense' (length=19)
  'acc_serial' => 
    array (size=2)
      0 => string 'd59f127d86' (length=10)
      1 => string 'd59fb74cb8' (length=10)

Account has 3 items, while debtor, creditor, description, and acc_serial have only 2 items. In this case, each of the remaining fields — Debtor, Creditor, Description, and Account Serial Number — should have three inputs, just like the Account Name field, because I added a third dynamic row to the journal entry. However, for some reason, the input values of the dynamic fields in the third newly added row are not being read, except for the Account Name field , The following error appears as shown in the iteration loop:An error occurred while processing data. Please try again.

PHP loop for processing rows

foreach ($_POST['account'] as $index => $value) {
    if (isset($_POST['account'][$index], $_POST['debtor'][$index], $_POST['creditor'][$index], $_POST['description'][$index], $_POST['acc_serial'][$index])) {
        $account = $_POST['account'][$index];
        $debtor = $_POST['debtor'][$index];
        $creditor = $_POST['creditor'][$index];
        $description = $_POST['description'][$index];
        $acc_serial = $_POST['acc_serial'][$index];
        
        if (empty($account) || empty($description) || empty($acc_serial) || $debtor === "" || $creditor === "") {
            echo '<script>toastr.error("Please fill all fields in row ' . ($index + 1) . '");</script>';
            exit;
        }

        if (!is_numeric($debtor) || !is_numeric($creditor)) {
            echo '<script>toastr.error("Debtor and Creditor must be numeric in row ' . ($index + 1) . '");</script>';
            exit;
        }
    } else {
        echo '<script>toastr.error("An error occurred while processing data. Please try again.");</script>';
        exit;
    }
}

HTML structure for dynamic rows

<form method="POST" action="" class="row g-3 needs-validation" id="myform" enctype="multipart/form-data" novalidate>
  <!-- Input Table -->
  <table class="table" style="text-align:center;" id="dynamicAddRemove">
    <thead style="background-color:#9eeaf9;color:#055160;">
      <tr>
        <th style="border-left:2px white solid;">Account</th>
        <th style="width:10%;border-left:2px white solid;">Debit</th>
        <th style="width:10%;border-left:2px white solid;">Credit</th>
        <th style="width:10%;">Description</th>
        <th></th>
        <th>
          <button type="button" name="add" id="add-btn" class="btn btn-success">
            <i class="fas fa-plus"></i>
          </button>
        </th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>
          <select class="form-control select_account js-example-basic-single select2" name="account[]" required>
            <option value="<?php echo $_acc_serial_token; ?>"><?php echo $_account; ?></option>
            <?php
            $stmt = $con->prepare("SELECT * FROM categories WHERE parent_id != ? AND status = ? AND company = ?");
            $a = 0;
            $stmt->bind_param('iis', $a, $a, $_SESSION["company"]);
            $stmt->execute();
            $resultCategories = $stmt->get_result();
            $rows = [];
            foreach ($resultCategories as $row) {
              $rows[] = $row;
            ?>
            <option value="<?php echo htmlspecialchars(strip_tags($antiXss->xss_clean($row['acc_serial']))); ?>">
              <?php echo htmlspecialchars(strip_tags($antiXss->xss_clean($row['acc_name']))); ?>
            </option>
            <?php } ?>
            <?php $stmt->close(); ?>
          </select>
        </td>
        <td>
          <input type="text" style="max-width: 94px;" onkeypress="return event.charCode >= 48 && event.charCode <= 57" 
          onpaste="return false" name="debtor[]" value="<?php echo $_debtor; ?>" class="form-control debtor" required>
        </td>
        <td>
          <input type="text" style="max-width: 94px;" onkeypress="return event.charCode >= 48 && event.charCode <= 57" 
          onpaste="return false" name="creditor[]" value="<?php echo $_creditor; ?>" class="form-control creditor" required>
        </td>
        <td>
          <input type="text" name="description[]" value="<?php echo $_description; ?>" style="min-width: 205px;" 
          class="form-control" required>
        </td>
        <td>
          <input name="acc_serial[]" class="form-control acc_serial" type="hidden" value="<?php echo $_acc_serial_token; ?>" required>
        </td>
        <td>
          <button type="button" name="add" class="btn btn-danger remove-tr">
            <i class="fas fa-trash"></i>
          </button>
        </td>
      </tr>
    </tbody>
    <!-- Totals Row -->
    <tr>
      <td style="color:#055160;"><strong>Total</strong></td>
      <td style="background-color:#9eeaf9;color:#055160;">
        <input type="text" style="max-width: 94px;border:0;" name="sum1" id="sum1" class="form-control sum1" readonly>
      </td>
      <td style="background-color:#9eeaf9;color:#055160;">
        <input type="text" style="max-width: 94px;border:0;" name="sum2" id="sum2" class="form-control sum2" readonly>
      </td>
    </tr>
  </table>
  <!-- Hidden Data -->
  <div id="data" data-rows="<?php echo htmlspecialchars(json_encode($antiXss->xss_clean($rows))); ?>"></div>
  <!-- Save and Cancel Buttons -->
  <div class="col-md-3 float-end">
    <div class="btn-group">
      <button class="btn btn-primary add_entry" name="update_entry" type="submit">
        <i class="fa-regular fa-floppy-disk"></i> Save
      </button>
      <a href="j-entry.php" class="btn btn-secondary" data-bs-dismiss="modal">
        <i class="fa-solid fa-ban"></i> Cancel
      </a>
    </div>
  </div>
</form>

JavaScript for adding dynamic rows:

  var dataElement = document.getElementById('data');
  var data = JSON.parse(dataElement.dataset.rows);
  var product_dd = "";
  product_dd += '<select class="form-control select_acount js-example-basic-single select2" name="account[]" required>';
  product_dd += '<option value="">--Select Account--</option>';
  // Ensure that the data has been converted into a JavaScript array
  if (Array.isArray(data)) {
    // Use a loop to create options from the data
    data.forEach(function(item) {
      product_dd += '<option value="' + item.acc_serial + '">' + item.acc_name + '</option>';
    });
  } else {
    console.error("Error: Invalid data format");
  }

  product_dd += "</select>";

  var i = 0;

  $(document).ready(function() {
    // Update the sum of debtor and creditor values when the page loads
    $('.sum1').val(calcSum(".debtor").toFixed(2));
    $('.sum2').val(calcSum(".creditor").toFixed(2));
  });

  $("#add-btn").click(function() {
    ++i;
    
    $("#dynamicAddRemove").append('<tr>'+
      '<td class="td">'+product_dd+'</td>'+
      '<td class="td"><input type="text" name="debtor[' + i + ']" style="max-width: 94px;padding-left: 10px;" id="fname" class="form-control debtor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
      '<td class="td"><input type="text" name="creditor[' + i + ']" id="james" style="max-width: 94px;padding-left: 10px;" class="form-control creditor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
      '<td><input type="text" name="description[' + i + ']" style="min-width: 210px;" class="form-control" required></td>'+
      '<td><input class="form-control acc_serial" type="hidden" name="acc_serial[' + i + ']" required></td>'+
      '<td><button type="button" name="add" class="btn btn-danger remove-tr"><i class="fas fa-trash"></i></button></td>'+
      '</tr>');
  });

Additional Notes:

The array notation (e.g., name="account[]") is consistent for all input fields.

The issue only occurs with rows added dynamically via JavaScript. var_dump($_POST) confirms that only the first field (account[]) of the last row is being captured, while the other fields (debtor[], creditor[]) are missing.

This issue persists regardless of the number of rows; the problem is always isolated to the last row.

What I Tried:

• Verified that all dynamically added fields are appended correctly with unique indices.
• Checked the HTML structure in the browser's developer tools to ensure no issues with element naming or structure.
• Inspected the JavaScript code responsible for adding rows, and it appears to work as intended.

My Question:

Why does this issue always occur with the last row? How can I ensure that all fields from the last dynamically added row are properly recognized and processed in PHP?

What could cause this mismatch in field counts when adding dynamic rows?

How can I debug or fix this issue to ensure all fields are submitted correctly?

• php
• html
• jquery

Share Improve this question Follow edited Jan 3 at 10:27 Tony 10.3k33 gold badges5050 silver badges7777 bronze badges asked Dec 31, 2024 at 16:59 dezeerdezeer 2933 bronze badges 22

• 1 You should be appending to $("#dynamicAddRemove tbody"). What is the i variable for? – Barmar Commented Dec 31, 2024 at 17:23
• 2 But I can't see any reason for the mismatch. Are you sending the form data using normal form submission, or AJAX? – Barmar Commented Dec 31, 2024 at 17:26
• 1 Use the Elements viewer in DevTools to make sure that all the input fields are inside the <form>. – Barmar Commented Dec 31, 2024 at 18:04
• 1 Which row is missing from the POST data? Is it the initial static row, or one of the dynamically-added rows? – Barmar Commented Dec 31, 2024 at 18:05
• 1 acc_serial[] is hidden and seems left empty. Also if you face this error after removing some rows, make sure the row is removed correctly. – Ali Sheikhpour Commented Jan 1 at 6:23

 |  Show 17 more comments

1 Answer 1

Sorted by: Reset to default 0

In your JavaScript code, you are appending rows with name attributes like this:

'<td class="td"><input type="text" name="debtor[' + i + ']" ...></td>'+
'<td class="td"><input type="text" name="creditor[' + i + ']" ...></td>'+
'<td><input type="text" name="description[' + i + ']" ...></td>'+
'<td><input class="form-control acc_serial" type="hidden" name="acc_serial[' + i + ']" ...></td>'+

However, the account[] field is being added with a different naming convention: ''+product_dd+''+ This inconsistency in naming conventions (account[] vs. debtor[i], creditor[i], etc.) is causing the mismatch in the PHP $_POST arrays.

Solution To fix this issue, you need to ensure that all dynamically added fields use the same naming convention. Specifically, you should use the array notation ([]) for all fields. Here's how you can modify your JavaScript code:

$("#dynamicAddRemove").append('<tr>'+
    '<td class="td">'+product_dd+'</td>'+
    '<td class="td"><input type="text" name="debtor[]" style="max-width: 94px;padding-left: 10px;" id="fname" class="form-control debtor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
    '<td class="td"><input type="text" name="creditor[]" id="james" style="max-width: 94px;padding-left: 10px;" class="form-control creditor" onkeypress="return event.charCode >= 48 && event.charCode <= 57" onpaste="return false" required></td>'+
    '<td><input type="text" name="description[]" style="min-width: 210px;" class="form-control" required></td>'+
    '<td><input class="form-control acc_serial" type="hidden" name="acc_serial[]" required></td>'+
    '<td><button type="button" name="add" class="btn btn-danger remove-tr"><i class="fas fa-trash"></i></button></td>'+
    '</tr>');
});

    
  

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