Drupal 8 - development of tiny module

Closing this project as the discription might have been missleading: Reopening here: https://www.freelancer.es/projects/project-18611546 Setting up a new Drupal 8 version of our website and coworking platform we stepped into a problem because of an actual bug in Drupal 8: “View output is not used for entityreference options” ([login to view URL]). We need a little module to provide short term solution or a temporay workarround for being able to activate the feature of signing up to our events. Environment: There are two content types 'Cycle' and 'Event', both having a date range field (field_date), and entity reference from Event towards Child nodes (field_cycle) making event a child of cycle, taxonomy reference field to define access through TAC module, and several other data fields, like event type, subtitle, daily basic contribution, event fee, and others. Also there is the content type 'signup' with an multiple choice entity reference field towards 'Cycle' and 'Event'. Also there is are user roles which are of significance for the feature request. Feature request: We need a checkbox widget for the entity reference field (field_event) in the signup contant type to be rendered with the label <span class”date” data-date-start”=[field_date1] data-date-end”=[field_date2]>[field_date]</span> <span class”title”>[title]</span> <span class”date”>[field_subtitle]</span> <span class=”type”>[field_type]</span> <span class”fee” data-event-fee”=[field_event_fee]>[field_event_fee]</span> <span class=”data hidden” data-dailycontribution=”[field_contribution] data-cycleintegration=”[field_cycleintegration] data></span> filtered by field_date >= now and visibility controled by TAC and sorted by field date. Below the widget we need a text which as easiest would be rendering a node, so the rare need of modifying this text can be solved with node edit without need of additional interfaces. This text hold several tokens to be replaced on client side through jquery. On client side we need an interactive jquery modification of the widget and the text below. If clicked walking through all options and adding a class depending on the relation to the previous option: what is the date difference to the last checked option, what is the content of field_cycleintegration (being optional or integrated with the parent node 'cycle') and what is the user role (provided through a body data attribute) in relation to the event type. Also calculating the total amounds of days and the total contribution as result of daily contributions and event fees of selected nodes. The result of the calculations will be made visible by replacing the tokens in the following text. The exact formular to provide classes and calculate fees will be provided once we collaborate. The old widget is to be found at [login to view URL] The previous script at http:// sensaciones. de/ sites/all/modules/sensa_signups/[login to view URL] plysz0 (done by a beginner) If we work together successfully we might ask for more little modules later.