|page

The |page filter creates a link to a page using a page file name, without an extension, as a parameter. For example, if there is the about.htm page you can use the following code to generate a link to it:

<a href="{{ 'about'|page }}">About Us</a>

Remember that if you refer a page from a subdirectory you should specify the subdirectory name:

<a href="{{ 'contacts/about'|page }}">About Us</a>

To access the link to a certain page from the PHP section, you can use $this->pageUrl('page-name-without-extension').

<?
function onStart()
{
    $this['newsPage'] = $this->pageUrl('blog/overview');
}
?>

{{ newsPage }}

You can create a link to the current page by filtering the this variable.

<a href="{{ this|page }}">Refresh page</a>

To get the link to the current page in PHP, call the $this->pageUrl() method without any arguments.

<?
function onStart()
{
    $this['currentUrl'] = $this->pageUrl();
}
?>

{{ currentUrl }}

# Reverse Routing

When linking to a page that has URL parameters defined, the |page filter supports reverse routing by passing an array as the first argument.

url = "/blog/post/:post_id"

[...]

Given the above content is found in a CMS page file post.htm you can link to this page using:

<a href="{{ 'post'|page({ post_id: 10 }) }}">
    Blog post #10
</a>

If the website address is https://octobercms.com the above example would output the following:

<a href="https://octobercms.com/blog/post/10">
    Blog post #10
</a>

# Persistent URL Parameters

If a URL parameter is already presented in the environment, the |page filter will use it automatically.

url = "/blog/post/:post_id"

url = "/blog/post/edit/:post_id"

If there are two pages, post.htm and post-edit.htm, with the above URLs defined, you can link to either page without needing to define the post_id parameter.

<a href="{{ 'post-edit'|page }}">
    Edit this post
</a>

When the above markup appears on the post.htm page, it will output the following:

<a href="https://octobercms.com/blog/post/edit/10">
    Edit this post
</a>

The post_id value of 10 is already known and has persisted across the environments. You can disable this functionality by passing the 2nd argument as false:

<a href="{{ 'post'|page(false) }}">
    Unknown blog post
</a>

Or by defining a different value:

<a href="{{ 'post'|page({ post_id: 6 }) }}">
    Blog post #6
</a>