Access ListItem.Properties from Javascript COM

Question

Is there a possibility to access the ListItem.Properties from the Javascript COM? All I'm seeing is the possibility to read all Fields. There also is the funny [SP.ListItem.LoadExpandoFields()][1], but I don't know what it does.

Answer 1

You could try:

item.get_fieldValues().MetaInfo

Full example (with ES5):

var listTitle = 'TestList', itemId = 1;

var ctx = new SP.ClientContext();
var item = ctx.get_web().get_lists().getByTitle(listTitle).getItemById(itemId);
ctx.load(item);
ctx.executeQueryAsync(function() {
  var properties = item.get_fieldValues().MetaInfo;
  properties = properties.split(/\n/).filter(function(p) {
    return !!p;
  }).map(function(p) {
    p = p.split(/\|/);
    var t = p[0].split(/:/);
    return {
      name: t[0],
      type: t[1],
      value: p[1]
    };
  });
  console.log(properties);
});