I'm looking for a way to edit data before passing them to view.
Quick example (just to demonstrate):
Let's say I am passing variable $name to a view through controller. I would like to use something to pass another variable $message which would contain Hello $name, so for example Hello John, if variable $name would be John.
I don't want to send this second variable in controller, because I'm gonna use a lot of controllers, views and the thing that I want to do with the data is rather complicated.
I need to use this for both variables view("foobar", ["foo" => "bar"]) and sessions view("foobar")->with("foo", "bar").
I've tried to use both Middleware and Service Provider but the problem was I couldn't access the sent data.
The only possible solution I can think of now is to use View layout which I'm going to include into every view and which is gonna transform the variables (using something like <? $message = "Hello $name"; ?> in the view), but this doesn't seem like the right MVC solution for me.
Thank you all for your answers!
If you want to pass session data and multiple variables, do this:
session()->flash('message', 'some message');
return view('foobar', [
'foo' => 'bar',
'second' => 'something'
]);
Update
If I understood you correctly, you want to use view composer.
Related
I have just started learning Code Igniter .
I want to know how can I pass a variable from one controller(first_cont.php) to other controller (second_cont.php) ?
Any help would be appreciated .
Thanks in Advance :)
It will depend on the circumstances. If you want to retain the data for some time, then session data would be the way to go. However, if you only need to use it once, flash data might be more appropriate.
First step would be to initialise the session library:
$this->load->library('session');
Then store the information in flash data:
$this->session->set_flashdata('item', $myVar);
Finally, in the second controller, fetch the data:
$myVar = $this->session->flashdata('item');
Obviously this would mean you'd have to either initialise the session library again from the second controller, or create your own base controller that loads the session library and have both of your controllers inherit from that one.
I think in codeigniter you can't pass variable, between two different controller. One obvious mechanism is to use session data.
Ok, here is something about MVC most will readily quote:
A Controller is for taking input, a model is for your logic, and, a view is for displaying.
Now, strictly speaking you shouldn't want to send data from a controller to another. I can't think of any cases where that is required.
But, if it is absolutely needed, then you could simply use redirect to just redirect to the other controller.
Something like:
// some first_cont.php code here
redirect('/second_cont/valuereciever/value1')
// some second_cont.php code here
public function valureciever($value){
echo $value; // will output value1
}
In Codeigniter there are many way to pass the value from one controller to other.
You can use codeigniter Session to pass the data from one controller to another controller.
For that you have to first include the library for session
$this->load->library('session');
Then You can set the flash data value using variable name.
// Set flash data
$this->session->set_flashdata('variable_name', 'Value');
Them you can get the value where you want by using the codeigniter session flashdata
// Get flash data
$this->session->flashdata('variable_name');
Second Option codeigniter allow you to redirect the url from controll with controller name, method name and value and then you can get the value in another controller.
// Passing the value
redirect('/another_controller_name/method_name/variable');
Then you can get the value in another controller
public function method_name($variable)
{
echo $variable;
}
That all....
If you are using session in the first controller then dont unset that session in first controller, instead store the value which you want in the other controller like,
$sess_array = array('value_name1' => 'value1', 'value_name2' => 'value2');
$this->session->set_userdata('session_name', $sess_array);
then reload this session in the other controller as
$session_data= $this->session->userdata('session_name');
$any_var_name = $session_data['value1'];
$any_var_name = $session_data['value2'];
this is how you can pass values from one controller to another....
Stick to sessions where you can. But there's an alternative (for Codeigniter3) that I do not highly recommend. You can also pass the data through the url. You use the url helper and the url segment method in the receiving controller.
sending controller method
redirect("controller2/method/datastring", 'refresh');
receiving controller method
$this->load->helper('url');
$data = $this->uri->segment(3);
This should work for the default url structure. For a url: website.com/controller/method/data
To get controller $this->uri->segment(1)
To get method $this->uri->segment(2)
The limitation of this technique is you can only send strings that are allowed in the url so you cannot use special characters (eg. %#$)
I'm using Doctrine2 and CodeIgniter2, and am new to both, as well as to OOP/MVC, so please use simple explanations :)
For testing purposes, I have a Controller a Model and a View. I want to display data from a table that contains user information. First name, last name, ID number, and so forth.
My controller makes a call to the model- which retrieves data from the doctrine entity, and then the controller passes that data to the view.
(controller)
class Test_v_to_m extends CI_Controller {
public function index() {
$this->load->model('testing/test_v_to_m_model');
$data = $this->test_v_to_m_model->display_user_info();
$this->load->view('testing/test_v_to_m_view', $data );
}
}
(model)
class Test_v_to_m_model extends CI_Model{
public function display_user_name() {
$query = $this->doctrine->em->createQuery("select u from ORM\Dynasties2\Users u");
return $query->getResult();
(view)
//print_r($data);
First question is: How do I pass the object or array along to the view in a useful way? This works if I'm just dealing with a single variable:
(controller)
$user = $this->doctrine->em->find('Entities\User', $user_id);
$data['firstname'] = $user->getFirstName();
$this->load->view('testing/test_v_to_c_view_2',$data);
(view)
echo $firstname;
But I don't know how to do something similar when its an array, or a multidimensional array.
The second question is whether or not to let the view do any real work (php logic, loops, foreach, etc) or to do all of that in the controller and have the view only do formatting and display.
Yes, You can just pass multi-dimensional array to the view and then access it as required.
e.g.
$template_date['result_arr'] = array(
array('firstname' => 'abc', 'lastname' => 'xyz')
, array('firstname' => 'abc', 'lastname' => 'xyz')
);
in your view file -
foreach($result_arr as $key => $row) {
echo $row['firstname'].' <br />';
}
Re your 2nd question - As per my understanding - it's fine to use some foreach, for loops in the view but it's best if business logic is kept to controllers and models. Hope it makes sense to you.
As for your first question, I don't know the answer off the top of my head (sorry!). I would imagine, however, that an array can be passed as part of the data (as a single item), but you would need to iterate though it in the view (see below). Just a guess, however...
As for your second question, the principle of MVC is to have only display logic in the view - so all of the "real work" should be done in the controller.
Now, if you want to have a loop to display data in a table, that's "real work" being done in the view, but since it's part of formatting and display that would be acceptable.
Regarding your first question, it's actually quite simple:
$data = array(
'firstname' => 'string',
'array' => array(1, 2, 3),
'multidimensional_array' => array('ocean' => 'deep')
);
In the view, you can access these as:
$firstname;
$array;
$multidimensional_array;
They're just exported to the view, so you can treat each key in the $data array as a variable, and the values in the $data array as the variables' values.
Regarding the second question, it is generally best if you have the view only do formatting and display. In some cases, it might be useful to use ifs or loops, for example, if you want to display different messages based on a certain variable, or if you want to fill a table with a bunch of rows. However, I strongly recommend that you keep out as much logic as possible. The view is meant to receive all the data it needs and display it in a way that suits it.
There are plenty of reasons for this, namely maintainability (if your logic changes, you don't need to update the view), reusability (if you make views as general as possible, you can reuse them very easily) and even the ability to create new views or to replace that view with a different one, without worrying about the logic.
I hope this helps. :)
When I call a controller and it calls the model, model returns information from my database assigned to something in the controller.
But how does it "send" it to the view for rendering? How for example, when I send $data array to my_view.php. how does it get to that page so that, I am guessing, I can do things like use extract to get my individual variables.
I'm really asking at the php level, how would you send that data (so I can learn). How does that view know what I sent it?
Thanks.
You have to "send" that $data array to the view as the second parameter when you load it.
$data['user'] = array(
'name' => 'Tom Jones',
'gender' => 'male'
);
$this->load->view('blogview', $data);
Then, the contents of the array are accessed within the view by their corresponding key values
<?php echo $user['name']; ?>
Checkout out the docs for more details: http://codeigniter.com/user_guide/general/views.html
The general pattern of all php views is this:
function render_view($__filename, $__data) {
extract($__data);
include $__filename;
}
This is basically how CodeIgniter does it, but it uses a loader to find the view filename and includes output buffering options.
I know this is a really simple thing that I really should know but I'm trying to learn cakephp without having done much php before. I've been told thats a stupid idea, but I'm doing it for fun and so I'm doing it.
I want to pass an array from one controller action to another controllers action and then pass it to the view. I have:
sponges_controller.php
$info = $this->data;
$this->redirect(array('controller'=>'baths', 'action'=>'dashboard', $info));
baths_controller.php
function dashboard($info) {
$this->set('info', $info);
}
and then
<?php echo debug($info); ?>
in the view for dashboard.
I've tried various ways but can't make it work. All it does is print out Array()
Plz help me! :) Julia
You can't pass data that way from one controller to the other as far as I know, at most you can concat a string to the action, like an ID for view or editing.
If you want to pass the info you could try setting it in the SESSION variable in the following way:
$this->Session->write('Info', $info);
And in your other controller you can check for it:
$this->Session->read('Info');
It looks like cake will not let you pass an array into a controller action. I set up a simple example and I got an 'array to string conversion error'. Is there a specific reason why you aren't just posting the data to baths/dashboard? I can think of a workaround for your problem, but it is quite messy.
8vius's solution above will definitely work.
Here is another way, but using sessions is probably a lot better
$str = http_build_query($info);
$this->redirect('/baths/dashboard?'.$str);
So then in your baths/dashboard action, you will have access to your data using the php $_GET array.
So if you originally had this->data['name'] you can access it with $_GET['name']
I'm not sure about the passing data in different controllers but within the same controller we can do it just like a function call by writing something like this.
$this->function_name($info);
This will perfectly work as intended. I've not tried this type of data passing in different controllers function.
I am having some trouble trying to "capture" the rendered html of an elmenet in cake php.
Say I have an element named "message.ctp"
I would like to do something like the following:
A making a $.getJSON request to an action in a controller say jsonAction(). Within this action I will perform some DB updates and return a json string. I would like to store the html is a part of the json object. Doable?
function jsonAction() {
//Do DB update
if(db update was ok) {
$response = array("completed" => true, "html" => $this->render("message"));
} else {
$response = array("completed" => false);
}
echo json_encode($response);
}
What seems to be happening right now is that the render method echos the rendered value instead of returning it.
Anyway I can achieve this?
Thanks
Regards
Gabriel
Forget elements for the time being.
First of all you have to separate everything that includes outputting stuff from the controller (either it is HTML or JSON or whatever).
For every controller action you have to have a corresponding view. So, for controller action jsonAction you should have a view names json_action.ctp (at the corresponding folder, e.g. if jsonAction is at MessagesController create a folder named /view/messages/json_action.ctp).
Set your variable from controller, display it at view and you are done. Do not forget to $this->layout = 'empty' from controller so that you display only what you have at the view.
Generally you should redo the CakePHP tutorials and reread the book it order to understand better the MVC (Model-View-Controller) pattern and CakePHP structure.
Do you mean this?
$myRenderedHtml = $this->element('message');
^^^^^^^