Opencart - Undefined variable in new shipping module

Question

I'm making a new shipping module for opencart. Which simply takes the name and cost from the admin. But, shows an error inside the textbox.

I'm stuck in here, Really want solution. My view (.tpl) file is given below.

  <div class="box">
    <div class="heading">
      <h1><img src="view/image/shipping.png" alt="" /> <?php echo $heading_title; ?></h1>
      <div class="buttons"><a onclick="$('#form').submit();" class="button"><?php echo $button_save; ?></a><a href="<?php echo $cancel; ?>" class="button"><?php echo $button_cancel; ?></a></div>
    </div>


    <div class="content">
      <form action="<?php echo $action; ?>" method="post" enctype="multipart/form-data" id="form">
        <table class="form">

          <tr>
            <td><?php echo $entry_name; ?></td>
            <td><input type="text" name="ndz_name" value="<?php echo $ndz_name; ?>" /></td>
          </tr>
          <tr>
            <td><?php echo $entry_amount; ?></td>
            <td><input type="text" name="ndz_amount" value="<?php echo $ndz_amount; ?>" /></td>
          </tr>
          <tr>
            <td><?php echo $entry_status; ?></td>
            <td><select name="ndz_status">
                <?php if ($ndz_status) { ?>
                <option value="1" selected="selected"><?php echo $text_enabled; ?></option>
                <option value="0"><?php echo $text_disabled; ?></option>
                <?php } else { ?>
                <option value="1"><?php echo $text_enabled; ?></option>
                <option value="0" selected="selected"><?php echo $text_disabled; ?></option>
                <?php } ?>
              </select></td>
          </tr>
          <tr>
            <td><?php echo $entry_sort_order; ?></td>
            <td><input type="text" name="ndz_sort_order" value="<?php echo $ndz_sort_order; ?>" size="1" /></td>
          </tr>
        </table>
      </form>
    </div>
  </div>

Opencart version : 1.5

Answer 1

Because you need to initialize your $ndz_name and $ndz_amount before you echos it.

$ndz_name = '';
$ndz_amount = '';
if (!empty($_POST["ndz_name"])) {
    $ndz_name = $_POST["ndz_name"];
}
if (!empty($_POST["ndz_amount"])) {
    $ndz_amount = $_POST["ndz_amount"];
}