The contextual link button is always rendered even when no links are available.
Use case: A user with a limited role but with the use contextual permissions but no block permissions will see the contextual filter button for the blocks without the links.
function initContextual($contextual, html) {
var $region = $contextual.closest('.contextual-region');
var contextual = Drupal.contextual;
$contextual
// Update the placeholder to contain its rendered contextual links.
.html(html)
// Use the placeholder as a wrapper with a specific class to provide
// positioning and behavior attachment context.
.addClass('contextual')
// Ensure a trigger element exists before the actual contextual links.
.prepend(Drupal.theme('contextualTrigger'));
// Set the destination parameter on each of the contextual links.
var destination = 'destination=' + Drupal.encodePath(drupalSettings.path.currentPath);
$contextual.find('.contextual-links a').each(function () {
var url = this.getAttribute('href');
var glue = (url.indexOf('?') === -1) ? '?' : '&';
this.setAttribute('href', url + glue + destination);
});The prepend(Drupal.theme('contextualTrigger')) is always added even when there are no links.
A check should be done before adding the the contextual elements.
function initContextual($contextual, html) {
if ($(html).find('a').length === 0) {
return;
}
var $region = $contextual.closest('.contextual-region');
var contextual = Drupal.contextual;
$contextual
// Update the placeholder to contain its rendered contextual links.
.html(html)
...I don' think that an action is required when there are no links.