Can not take value from view on codeigniter - php

Question

I've been working on this codeigniter php app for my class and I have a view where you can select a quantity of a coin and the selected quantity comes back as a null.
my controller:
public function add(){
$this->form_validation->set_rules('quantity', 'Quantity', 'required');
if(!$this->session->userdata('logged_in')){
redirect('users/login');
}
$inventorycoin = $this->uri->segment('3');
$inventoryquantity = $this->input->post('quantity');
$this->coin_model->add_coin($inventorycoin, $inventoryquantity);
//$this->session->set_flashdata('post_deleted', 'Post has been deleted');
redirect('coins');
}
my model:
public function add_coin($inventorycoin, $inventoryquantity){
$data = array (
'inventory_user' => $this->session->userdata('user_id'),
'inventory_quantity' => $inventoryquantity,
'inventory_coin' => $inventorycoin
);
return $this->db->insert('inventory', $data);
}
my view:
<?php echo form_open_multipart('coins/add', 'id="coins"'); ?>
<table width="100%">
<?php foreach($coins as $coin) : ?>
<tr>
<td><img class="post-thumbnail" style="width: 200px; height: 200px" src="<?php echo site_url(); ?>assets/images/coins/<?php echo $coin['coin_image']; ?>"></td>
<td><?php echo $coin['coin_name']; ?></td>
<td><?php echo $coin['coin_country']; ?></td>
<td><?php echo $coin['coin_weight']; ?></td>
<td><input type="number" min="0" name="quantity" placeholder="Qt" style="width: 40px"></td>
<td><p><a class="btn btn-primary" href="<?php echo base_url(); ?>coins/add/<?php echo $coin['coin_id']; ?>">Add</a></p></td>
</tr>
<?php endforeach; ?>
</table>
</form>
What could be the problem?

Answer 1

You don't use submit button. So this part won't work.
$inventoryquantity = $this->input->post('quantity');
You are looping the input .So try to change your form to this.
<?php echo form_open_multipart('coins/add/', 'id="coins"'); ?>
<table width="100%">
<?php foreach($coins as $coin) : ?>
<tr>
<input name="inventorycoin[]" type="hidden" value = "<?=$coin['coin_id'];?>" >
<td><img class="post-thumbnail" style="width: 200px; height: 200px" src="<?php echo site_url(); ?>assets/images/coins/<?php echo $coin['coin_image']; ?>"></td>
<td><?php echo $coin['coin_name']; ?></td>
<td><?php echo $coin['coin_country']; ?></td>
<td><?php echo $coin['coin_weight']; ?></td>
<td><input type="number" min="0" name="quantity[]" placeholder="Qt" style="width: 40px"></td>
<td>--</td>
</tr>
<?php endforeach; ?>
</table>
<button type="submit"> Add </button>
</form>
and your function to this
public function add(){
$this->form_validation->set_rules('quantity', 'Quantity', 'required');
if(!$this->session->userdata('logged_in')){
redirect('users/login');
}
$inventorycoin = $this->input->post('inventorycoin');
$inventoryquantity = $this->input->post('quantity');
echo "<pre>";print_r($inventorycoin);
echo "<pre>";print_r($inventoryquantity); // you need to loop this because it is an array
redirect('coins');
}

Answer 2

You can change the below line in the view:
<td><p><a class="btn btn-primary" href="<?php echo base_url(); ?>coins/add/<?php echo $coin['coin_id']; ?>">Add</a></p></td>
Into this and try.
<td><p><a type="submit" class="btn btn-primary" href="<?php echo base_url('coins/add/'.$coin['coin_id']); ?>">Add</a></p></td>