codeigniter - loading a library from a view?

问题:

I have some data that I have to display as a table.

I think I should pass the data from the controller as $data['events'] = array(.....

and then load the view to display them.

        <?php
    $this->load->library('table');

    echo $this->table->generate($events);
    ?>

this doesn't work though - it gives a Fatal error: Call to a member function generate() on a non-object

If I paste the same code in the controller, obviously using ->generate($data['events'] the table gets displayed correctly.

Should I get that views can't load libraries, or I am doing something wrong? Or maybe should I capture the output of the library in the controller and send that to the view?

回答1:

You should run below code in the controller:

<?php
$this->load->library('table');

echo $this->table->generate($events);
?>

and store the data in variable and then send to the view.

回答2:

If you need to call a library (and its functions) within a view, you can do this:

$CI =& get_instance();
$CI->load->library('library_name');
$CI->library_name->yourFunction();

回答3:

To answer what you are doing wrong, you should know that the CodeIgniter class isn't declared in the view, and that this is the case for a reason - to abstract your PHP code from your HTML. Views should contain minimal PHP code (basic loops, conditions).

With this in mind, you should include your library as normal in the controller as follows;

controller

$this->load->library('table');
$data['events_table'] = $this->table->generate($events);

$this->load->view(....);

In the view, you simple echo the data. Although CodeIgniter allows short-hand tags, you should use standard PHP tags to keep to a convention that will work anywhere you keep your code.

view

<?php echo $events_table; ?>

回答4:

That is one wrong approach to MVC. You don't need to load the library in the view, because all views are loaded from one CONTROLLER, so every external Helper or Library should be loaded from the controller and the used or send to the views

Regards,
Pedro

回答5:

Note the shoulds: CodeIgniter is flexible in that it lets you do things the wrong way. It just makes it a little more difficult. You can do almost everything in the view, even when you shouldn't; but loading helpers, models, and views has to be done in the controller.

回答6:

You can auto-load the library in config/autoload.php

$autoload['libraries'] = array('database','session','table');

Then you can simply call the functions in your view .

echo $this->table->generate($events);

This was useful for me when i was creating a dynamic menu header . i auto-loaded the library which has the function for dynamic menu creation and then i simply called that function from the view , by the way it is bad practice .

回答7:

In controller or model use

$this->load->library('mylib');
$mylib=$this->mylib;
$data['mylib']=$mylib;
$this->load->view('myview',$data,false);

and than in view you can use library directly:

$mylib->myfunction();

It's not MVC like solution but works if you need.

回答8:

Simply load library on controller, then use it view.

Controller:

$this->load->library('table');
$data = array(
    array(1,2,3,4,5),
    array(1,2,3,4,5),
    array(1,2,3,4,5),
);
$this->load->view('the_view', compact('data'));

View:

echo $this->table->generate($data);