Form action not getting the data - php

Question

I can't get the value of the check box field. This is the structure of my code
<form action="<?php echo base_url()?>Home/dashboard" method="post">
<button class="btn btn-default" type="submit" name="delete" onclick="cliked1(event)"
style="margin-left:2px;background-color:blue;color:white;">Delete Item</button>
<td><input class="checkbox" type="checkbox"name="cb" value="1"> 1 </td>
</form>
In the controller
else if(isset($_POST['delete'])) {
$cb = $this->input->post('cb');
echo $cb;
}
I recreated the process it in other file and it works
<form action ="<?php echo base_url()?>Shop/test" method="POST">
<button class='btn btn-danger btn-xs' type="submit" name="delete" value="delete"><span class="fa fa-times"></span> delete</button>
<input type="checkbox" name="cb[]" value="lol">
<br>
<input type="checkbox" name="cb[]" value="yeaa">
</form>
In the Controller
function test()
{
$this->load->view('test');
if(isset($_POST['delete']))
{
$id = implode('^',$this->input->post('cb'));
print_r($id);
}
}
And I apply this process and it turns like this
<table id="example" class="display" cellspacing="0" width="100%">
<thead>
<th>ID</th>
<th>Item Photo</th>
<th>Item Name</th>
<th>Stocks</th>
<th>Date Posted</th>
<th>Price</th>
<th>Actions</th>
</thead>
<tbody>
<form action ="<?php echo base_url()?>Shop/test" method="POST">
<?php
$x=1;
foreach($shop_items as $key)
{
?>
<tr>
<td><input class="checkbox" type="checkbox" name="cb[]" value="<?php $key->shop_item_id?>"> <?php echo $x;?> </td>
<td><center><img src="<?php echo base_url()?>uploads/items_main/<?php echo $key->shop_item_main_pic;?>" style = "width:60px;height:50px;"alt=""></center></td>
<td><?php echo mb_strimwidth($key->shop_item_name, 0, 18,"...");?></td>
<td style="width:10px;"><center><button><span class="fa fa-eye"></span></button></center></td>
<td><?php echo date('F,d,Y',strtotime($key->shop_item_date_posted))?></td>
<td><?php if(!$key->shop_item_sale){ echo number_format($key->shop_item_orig_price);}
else{ echo "<font color='red'>".number_format(intval($key->shop_item_orig_price-($key->shop_item_orig_price*($key->shop_item_sale/100))))."</font> ";}?></td>
<td>
Bid | View
</td>
</tr>
<?php
$x+=1;
}
?>
<button class='btn btn-danger btn-xs' type="submit" name="delete" value="delete"><span class="fa fa-times"></span> delete</button>
</form>
</tbody>
</table>
The problem is that the submit button does not work.

Answer 1

In case of a checkbox, when the checkbox is not checked, you will not get the checkbox set in the $_POST. So to get the value of checkbox, you need to do this:
if (isset($_POST["cb"])) {
// Checkbox is checked.
$cb = $_POST["cb"];
} else {
// Checkbox is not checked.
}
And please do not check on type="submit".
From one of the resources:
In most cases this will work, but there are a few occasions when it won't. To identify when this condition will fail we have to look at the different ways of submitting a form.
There are two ways of submitting a form, one is to click the submit button, the other is to hit return, of which will invoke the submit button. The problem occurs when you hit the return button (as most people do), when using Internet Explorer (the most commonly used browser) and when the submit button does not have focus. This will submit the form, but it will not send the submit variable, which would mean the script we are using above will fail.