helpcenter.js

//     Underscore.js 1.5.2
//     http://underscorejs.org
//     (c) 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
//     Underscore may be freely distributed under the MIT license.
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(function() {
  var ticketFields = $('.form-field').find('[name]:first').not('[type="hidden"]');
  var systemRequiredFields = $('.form-field.required');
  var previousRequiredFields = [];

  function cfaApplyRules() {
    _.defer(function() {
      var ticketFormId = parseInt($('select[name="request[ticket_form_id]"]').val(), 10);
      var rules = !!ticketFormId ? _.filter(cfaRules, function(rule) {
        return rule.formId === ticketFormId;
      }) : cfaRules;
      var fieldsTypes = {};
      _.each(rules, function(rule) {
        fieldsTypes[rule.field] = rule.fieldType;
        // Special fix for the type field because it's name is not the same
        // in HC and Lotus.
        if (rule.fieldType === 'tickettype') {
          fieldsTypes[rule.field] = 'type';
        }
      });

      function ticketFieldForID(id) {
        var selector = "#request_custom_fields_"+id+"_, #request_custom_fields_"+id;
        var result = $(selector).closest('.form-field');
        if (!result.length) {
          result = $("#request_" + fieldsTypes[id]);
        }
        return result;
      }

      function clearFieldValueForID(id) {
        var $field = ticketFieldForID(id),
            $input = $field.find('input');
        $field.find('.nesty-input').text("-");
        if ($field.hasClass('boolean')) {
          $input.removeAttr('checked');
        } else {
          $input.val("");
        }
      }

      function fieldValueForID(id) {
        var field = ticketFieldForID(id);
        if (field.hasClass('boolean')) {
          return (field.find('input[type=checkbox]').is(':checked')) ? "yes" : "no";
        }
        var val = field.find('input, textarea').val();
        if (!val) {
          val = field.val();
        }
        return val;
      }

      function isFieldVisible(id) {
        return ticketFieldForID(id).is(':visible');
      }

      function fieldHasValue(id) {
        var field = ticketFieldForID(id);
        return fieldValueForID(id);
      }

      function disableSave() {
        $('footer input').prop('disabled', true);
      }

      function enableSave() {
        $('footer input').prop('disabled', false);
      }

      // A set of rules can be seen as a graph (nodes being fields and edges
      // representing the "can show" relation).
      function buildAdjacencyLists(rules) {
        var lists = {};
        function addEdge(from, to) {
          if (!_.has(lists, from)) {
            lists[from] = [to];
          }
          else if (!_.contains(lists[from], to)) {
            lists[from].push(to);
          }
        }
        _.each(rules, function(rule) {
          _.each(rule.select, function(target) { addEdge(rule.field, target); });
        });
        return lists;
      }
      function buildValuesTable(rules) {
        var table = {};
        _.each(rules, function(rule) {
          if (!_.has(table, rule.field)) {
            table[rule.field] = {};
          }
          _.each(rule.select, function(target) {
            if (!_.has(table[rule.field], target)) {
              table[rule.field][target] = [];
            }
            table[rule.field][target].push(rule.value);
          });
        });
        return table;
      }
      function findStartingNodes(lists) {
        return _.difference(_.map(_.keys(lists), Number), _.flatten(_.values(lists)));
      }

      // fields used in a view
      var used_fields = _.uniq(_.flatten(_.pluck(rules, 'select')));
      // hide them
      
      _.invoke(_.map(used_fields, ticketFieldForID), 'hide');
      

      // required fields
      var filteredRules = _.filter(rules, function(rule) {
        return rule.value == fieldHasValue(rule.field); // filter rules by current values
      });
      var requiredFields = _.filter(_.uniq(_.flatten(_.pluck(filteredRules, 'requireds'))), function(id) {
        return id && !_.contains(systemRequiredFields, ticketFieldForID(id)); // filter out system required fields
      });
      var addedRequiredFields = _.difference(requiredFields, previousRequiredFields);
      var removedRequiredFields = _.difference(previousRequiredFields, requiredFields);
      _.each(_.map(addedRequiredFields, ticketFieldForID), function(field) {
        field.removeClass('optional').addClass('required');
      });
      _.each(_.map(removedRequiredFields, ticketFieldForID), function(field) {
        field.removeClass('required').addClass('optional');
      });
      previousRequiredFields = requiredFields;

      var values = buildValuesTable(rules);
      var lists = buildAdjacencyLists(rules);
      var startingNodes = findStartingNodes(lists);

      function dfsTraversal(defect, node) {
        if (defect) {
          clearFieldValueForID(node);
        }
        _.each(lists[node], (function(target) {
          var newDefect = defect;
          if (!defect) {
            newDefect = !_.contains(values[node][target], fieldValueForID(node));
            if (!newDefect) {
              ticketFieldForID(target).show();
            }
          }
          dfsTraversal(newDefect, target);
        }));
      }

      _.each(startingNodes, function(node) { return dfsTraversal(false, node); });

      var missing = _.any(used_fields, function(node) {
        return isFieldVisible(node) && _.contains(requiredFields, node) && !fieldHasValue(node);
      });

      if (missing) {
        disableSave();
      } else {
        enableSave();
      }
    });
  }

  $(document).ready(function() {
    cfaApplyRules();
    $('select, input, textarea').on('change', cfaApplyRules);
  });

})();