How to add a 'read more' theme link to a custom view mode?

Question

In Drupal 7 the Teaser view mode automatically comes with a 'read more' theme link. I need to retain the Teaser view mode and then create another called 'Snippet', which is basically the same as Teaser but has a lot less content in the trimmed area.

I created a custom module and added the view mode...

/**
* Implements hook_entity_info_alter().
*/
function mymodule_entity_info_alter(&$entity_info) {
    // Add a custom view mode
    $entity_info['node']['view modes']['snippet'] = array(
        'label' => t('Snippet'),
        'custom settings' => TRUE,
    );
}

But it doesn't activate the 'read more' link like Teaser does. Can anyone point me in the right direction with this please?

Answer 1

You can use Display Suite for this. Each view mode gives you a screen like below with control over fields and pseudo-fields.

Answer 2

I took a look here

https://api.drupal.org/api/drupal/modules%21node%21node.module/function/node_build_content/7

and here

https://drupal.org/node/1844292

and came up with this

function YOURMODULE_node_view_alter(&$build) {
    if ($build['#view_mode'] == 'YOURVIEWMODE') {
        $node=$build['#node'];
        $links=array();     
        // Read more for teas ext
        $node_title_stripped = strip_tags($node->title);
        $links['node-readmore'] = array(
            'title' => t('Read more<span class="element-invisible"> about @title</span>', array('@title' => $node_title_stripped)),
            'href' => 'node/' . $node->nid,
            'html' => TRUE,
            'attributes' => array('rel' => 'tag', 'title' => $node_title_stripped)
        );
        // Assign links
        $build['links']['node']['#links']=$links;
    }
}

Answer 3

Add a new field 'Content:link' then give it a label none and 'Read more' in text to display.

Answer 4

you may add content and theming options in your

 mymodule_node_view($node,$view_mode,$langcode){}

you may customize your content through $node->content.

if you created a custom node you may use

mynodemodule_view($node,$view_mode,$langcode);

instead of hook_node_view

even you may attach a new tpl file or theming function for your node by $node->content['#theme'] = 'my_theme_item';