passing id to model class popup in bootstrap in codeigniter

1 <div class="modal-header"><h3 id="addNewLabel"><?php echo empty($cat->category_id) ? 'Add category' : 'Edit category ' . $cat->category; ?></h3></div><!-- end of .modal-header -->
2<div class="modal-body">
3<?php echo form_open('admin/category/manage') . PHP_EOL; ?>
4    <p>
5    <label for="category_name">Category name:</label>
6<input type="text" name="category_name" value="<?php echo set_value('category_name', $cat->category); ?>" />
7    </p>
8    <p>
9    <label for="parent">Set Parent category:</label>
10    <select>
11    <option>-- None --</option>
12    <?php if(count($all_categories)): foreach($all_categories as $cat): ?>
13    <option value="<?php echo $cat->category_id; ?>"><?php echo $cat->category; ?></option>
14    <?php endforeach; endif; ?>
15    </select>
16    </p>
17    <?php echo form_close() . PHP_EOL; ?>
18</div>
19<div class="modal-footer">
20    <button class="btn btn-primary" type="submit">Add</button>
21    <button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
22</div>
23