edit_authors.html

{% extends "base.html" %}
{# Copyright The IETF Trust 2021, All Rights Reserved #}
{% load origin %}
{% load static %}
{% load bootstrap3 %}

{% block pagehead %}
<link rel="stylesheet" href="{% static 'select2/select2.css' %}">
<link rel="stylesheet" href="{% static 'select2-bootstrap-css/select2-bootstrap.min.css' %}">
{% endblock %}

{% block morecss %}

    #empty-author-form {
        display: none;
    }
{% endblock %}

{% block title %}
    Edit authors for {{ titletext }}
{% endblock %}

{% block content %}
    {% origin %}
    <h1>Edit authors<br><small>{{ titletext }}</small></h1>

    <form enctype="multipart/form-data" method="post" id="authors-form">
        {% csrf_token %}
        {% bootstrap_form change_basis_form %}

        {% buttons %}
            <button id="add-author-button" type="button" class="btn btn-default" onclick="local_js.add_author()">Add new author</button>
        {% endbuttons %}

        {% bootstrap_form formset.management_form %}
        <div id="authors-list" class="well">
            {% for form in formset %}
                        <div class="panel panel-default author-panel">
                            <div class="panel-body draggable">
                                <span class="handle fa fa-reorder"></span>
                                <div class="form-horizontal">
                                    {% bootstrap_form form layout='horizontal' %}
                                </div>
                            </div>
                        </div>
            {% endfor %}
        </div>
        <div id="empty-author-form" class="template">
            <div class="panel panel-default author-panel">
                <div class="panel-body draggable">
                    <span class="handle fa fa-reorder"></span>
                    <div class="form-horizontal">
                        {% bootstrap_form formset.empty_form layout='horizontal' %}
                    </div>
                </div>
            </div>
        </div>
    
        {% buttons %}
            <button type="submit" class="btn btn-primary">Submit</button>
            <a class="btn btn-default pull-right"
               href="{% url "ietf.doc.views_doc.document_main" name=doc.canonical_name %}">Back</a>
        {% endbuttons %}
    </form>

{% endblock %}

{% block js %}
    <script src="{% static 'Sortable/Sortable.min.js' %}"></script>
    <script src="{% static 'select2/select2.min.js' %}"></script>
    <script src="{% static 'ietf/js/select2-field.js' %}"></script>

    <script type="text/javascript">
        const local_js = (
          function () {
              const sortable_list_id = 'authors-list';{# id of the container element for Sortable #}
              const prefix = 'author'; {# formset prefix - must match the prefix in the edit_authors() view #}
              var list_container;
              var form_counter;
              var author_template;
              var ajax_url = '{% url "ietf.person.ajax.person_email_json" personid="123454321" %}';
              var person_select2_input_selector = 'input.select2-field[name^="author-"][name$="-person"]'; 

              function handle_drag_end() {
                  // after dragging, set order inputs to match new positions in list
                  $(list_container).find('.draggable input[name^="' + prefix + '"][name$="ORDER"]').each(
                    function (index, elt) {
                        $(elt).val(index + 1);
                    })
              }

              function add_author() {
                  // __prefix__ is the unique prefix for each list item, indexed from 0
                  var new_html = $(author_template).html().replaceAll('__prefix__', form_counter.value);
                  var new_elt = $(new_html)
                  $(list_container).append(new_elt);
                  var new_person_select = new_elt.find(person_select2_input_selector);
                  setupSelect2Field(new_person_select);
                  new_person_select.on('change', person_changed);
                  
                  var form_count = Number(form_counter.value);
                  form_counter.value = String(form_count + 1);
                  
                  new_elt[0].scrollIntoView(true);
              }
              
              function update_email_options_cb_factory(email_select) {
                  // factory method creates a closure for the callback
                  return function(ajax_data) {
                      // keep the first item - it's the 'blank' option
                      $(email_select).children().not(':first').remove();
                      $.each(ajax_data, function(index, email) {
                          $(email_select).append(
                            $('<option></option>')
                            .attr('value', email.address)
                            .text(email.address)
                          );
                      });
                      if (ajax_data.length > 0) {
                          $(email_select).val(ajax_data[0].address);
                      }
                  }
              }

              function person_changed(event) {
                  var person_elt = $(this);
                  var email_select = $('#' + person_elt.attr('id').replace(/-person$/, '-email'));
                  $.get(
                    ajax_url.replace('123454321', $(this).val()),
                    null,
                    update_email_options_cb_factory(email_select)
                  );
              }
              
              function initialize() {
                  list_container = document.getElementById(sortable_list_id)
                  form_counter = document.getElementsByName(prefix + '-TOTAL_FORMS')[0];
                  author_template = document.getElementById('empty-author-form');

                  Sortable.create(
                    list_container,
                    {
                        handle: '.handle',
                        onEnd: handle_drag_end
                    });
                  
                  // register handler
                  $(person_select2_input_selector).on('change', person_changed);
              }

              return {
                  add_author: add_author,
                  initialize: initialize
              }
          }
        )()
        
        $(document).ready(local_js.initialize);
    </script>
{% endblock %}