Javascript: Query all users with read permission to specific list

Question

Is it possible to use javascript to retrieve all users with read permissions to specific list? This (http://www.c-sharpcorner.com/UploadFile/anavijai/how-to-get-all-the-users-from-site-group-in-sharepoint-2013/) shows how to get users from group but what
about list. All users in list may not exist in spgoups.

Answer 1

Hi,
If with Server Object Model which is executed in server side, in the
SPList object, there is a
RoleAssignments property can help to get what you want without looping through all the users in site:
public static void getPermissionsOfList()
using (SPSite site = new SPSite("http://sp"))
using (SPWeb web = site.RootWeb)
SPList list = web.GetList("/Lists/List1");
SPRoleAssignmentCollection roles = list.RoleAssignments;
foreach (SPRoleAssignment role in roles)
Console.WriteLine("~");
Console.WriteLine("Name: " + role.Member.Name);
SPRoleDefinitionBindingCollection bindings = role.RoleDefinitionBindings;
XmlDocument doc = new XmlDocument();
doc.LoadXml(bindings.Xml);
//Console.WriteLine(doc.InnerXml);
XmlNodeList itemList = doc.DocumentElement.SelectNodes("Role");
foreach (XmlNode currNode in itemList)
string s = currNode.Attributes["Name"].Value.ToString();
Console.WriteLine("Permission Level: " + s);
However, when comes to JavaScript Client Object Model, as there is no such property provided, I suggest you take the solution provided in my previous post for a try.
Thanks 
Patrick Liang
TechNet Community Support
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