How to retrieve Sharepoint 2010 list item permissions using Javascript Client Object Model

Question

My function for checking List Item permissions in Sharepoint doesn't seem to work. It is placed in aspx file on a Sharepoint 2010 site. I'm getting an error message below when trying to run it. Does anyone know how it should be done ? I found plenty of examples for the same function in C# but can't find anything in Javascript. Thanks !

function checkPermissions(){
var ctx = new SP.ClientContext.get_current();
var oBooksList=ctx.get_web().get_lists().getByTitle('test Repository');
var listItem=oBooksList.getItemById(2);


//ctx.load(listItem.get_roleAssignments());
ctx.load(listItem, 'RoleAssignments');
ctx.executeQueryAsync(
    Function.createDelegate(this, this.onSucceededCallback),
    Function.createDelegate(this, this.onFailedCallback));

}
function onSucceededCallback(sender, args){
    alert('it worked');
}

Error message:

SCRIPT5007: Unable to get value of the property 'apply': object is null or undefined

Only thing I can see... (unless it is an omission on purpose) is that there is no `onFailedCallback` function in your code.. That would cause something similar as it calls `Function.prototype.apply` or `onFailedCallback.apply` upon completion. — Michael Coxon, Apr 08 '15 at 15:08
Thanks Michael, it works after adding onFailedCallback function. However I have difficulty with retrieving callback data, so I can't check if returned data is correct. Any ideas anyone ? — Gumis, Apr 08 '15 at 15:57
If I remember correctly the fail callback only has 1 argument and that is the error.I think error.get_message() has the error message in it — Michael Coxon, Apr 08 '15 at 16:01
actually it has 2.. https://msdn.microsoft.com/en-us/library/office/hh185007%28v=office.14%29.aspx `function onQueryFailed(sender, args) { alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace()); }` — Michael Coxon, Apr 08 '15 at 16:06
Callback run succesfully as onSucceededCallback has been called. I had a look at the Object that was returned in args and it didn't have permission information. So it looks like there is something wrong with my initiall query.... — Gumis, Apr 08 '15 at 16:11
I recommend reading thought the api at https://msdn.microsoft.com/en-us/library/office/ee538253(v=office.14).aspx it has 'enough' useful info to get you on your way... in regards to getting the role assignments you are after `ctx.load(listItem.get_roleAssignments()` https://msdn.microsoft.com/en-us/library/office/ee551126(v=office.14).aspx this will return a collection that you will need to iterate over — Michael Coxon, Apr 08 '15 at 16:16

score 2 · Accepted Answer · answered Apr 08 '15 at 16:24

Something like this should help....

UNTESTED

function checkPermissions(){
    var ctx = new SP.ClientContext.get_current();
    var oBooksList = ctx.get_web().get_lists().getByTitle('test Repository');
    var listItem = oBooksList.getItemById(2);
    var roles = listItem.get_roleAssignments();

    ctx.load(roles);
    ctx.executeQueryAsync(
        // success
        function (sender, args){
            var roleInfo = '';
            var roleEnumerator = roles.getEnumerator();
            // enumerate the roles
            while (roleEnumerator.moveNext()) {
                var role = roleEnumerator.get_current();
                var principal = role.get_member();
                // get the principal
                ctx.load(principal);
                ctx.executeQueryAsync(
                    // success
                    function (sender, args){
                        // alert the title
                        alert(principal.get_title());
                    }, 
                    // failure
                    function (sender, args){
                        alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace()); 
                    });
            }
        }, 
        // failure
        function (sender, args){
            alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace()); 
        });

}

In the `while`-loop there is a small scoping issue, changing `var principal` into `let principal` should solve this. But in any case a good solution. — winner_joiner, Dec 05 '18 at 06:01

How to retrieve Sharepoint 2010 list item permissions using Javascript Client Object Model

1 Answers1