frontend renderer

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Patrick 2015-02-13 16:36:04 +01:00
parent 24ca274836
commit dab90c5b24

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@ -72,7 +72,7 @@ $data = [
At the top of your `Homepage.html` file add this code:
```
```php
{% for item in menuItems %}
<a href="{{ item.href }}">{{ item.text }}</a><br>
{% endfor %}
@ -118,6 +118,64 @@ If you refresh your homepage now, you should see the menu. But if you go to a su
The problem is that we are only passing the `menuItems` to the homepage. Doing that over and over again for all pages would be a bit tedious and a lot of work if something changes. So let's fix that in the next step.
to be continued...
We could create a global variable that is usable by all templates, but that is not a good idea here. We will add different parts of the site in the future like an admin area and we will have a different menu there.
So instead we will use a custom renderer for the frontend. First we create an empty interface that extends the existing `Renderer` interface.
```php
<?php
namespace Example\Template;
interface FrontendRenderer extends Renderer {}
```
By extending it we are saying that any class implementing the `FrontendRenderer` interface can be used where a `Renderer` is required. But not the other way around, because the `FrontendRenderer` can have more functionality as long as it still fulfills the `Renderer` interface.
Now of course we also need a class that implements the new interface.
```php
<?php
namespace Example\Template;
class FrontendTwigRenderer implements FrontendRenderer
{
private $renderer;
public function __construct(Renderer $renderer)
{
$this->renderer = $renderer;
}
public function render($template, $data = [])
{
$data = array_merge($data, [
'menuItems' => [['href' => '/', 'text' => 'Homepage']],
]);
return $this->renderer->render($template, $data);
}
}
```
As you can see we have a dependency on a `Renderer` in this class. This class is a wrapper for our `Renderer` and adds the `menuItems` to all `$data` arrays.
Of course we also need to add another alias to the dependencies file.
```php
$injector->alias('Example\Template\FrontendRenderer', 'Example\Template\FrontendTwigRenderer');
```
Now go to your controllers and exchange all references of `Renderer` with `FrontendRenderer`. Make sure you change it in both the `use` statement at the top and in the constructor.
Also delete the following line from the `Homepage` controller:
```php
'menuItems' => [['href' => '/', 'text' => 'Homepage']],
```
Once that is done, you should see the menu on both the homepage and your subpages.
to be continued...
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