在codeigniter中获取选定的值？

I have written a code as follow in the view.php file for select,

<select name="bloodgroup" id="mem_religion">
    <option value="">- Select Bloodgroup -</option>

    <?php  
    foreach ($bloodgroups as $bloodgroup) { ?>
        <option value="Option"> <?php echo $bloodgroup->bloodgroupname;  ?> 
    <?php } ?>
    </option> 
</select>

which gives me the correct result. How can I get the selectedvalue in the controller.php file?

You need to add form and button to post user selected value. Then in another page, retrieve the value. So:

In view.php:

<form method="post" action="/anotherpage">
<select name="bloodgroup" id="mem_religion">
    <option value="">- Select Bloodgroup -</option>

    <?php  
    foreach ($bloodgroups as $bloodgroup) { ?>
        <option value="Option"> <?php echo $bloodgroup->bloodgroupname;  ?> 
    <?php } ?>
    </option> 
</select>
<input type="submit" name="submit" value="submit">
</form>

In another page/controller:

$bloodgroup_selected = $this->input->post('bloodgroup');