getting TypeError: allGroups.getByName is not a function

Question

I am using this code example to redirect a user based on group, but I am facing this error message:

TypeError: allGroups.getByName is not a function

my code:

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"> 
 </script>


 <script type="text/javascript" src="/_layouts/1033/init.js"></script>
 <script  type="text/javascript" src="/_layouts/15/MicrosoftAjax.js"> 
 </script>
 <script  type="text/javascript" src="/_layouts/15/sp.core.js"></script>

    function IsCurrentUserMemberOfGroup(groupName, OnComplete) {
        alert('IsCurrentUserMemberOfGroup');
          console.log('CheckCurrentUerGroup called');
        var currentContext = new SP.ClientContext.get_current();
     console.log(currentContext );
        var currentWeb = currentContext.get_web();

           var currentUser = currentContext.get_web().get_currentUser();
          console.log(currentUser);

          currentContext.load(currentUser);

        var allGroups = currentWeb.get_siteGroups();
        currentContext.load(allGroups);

        var group = allGroups.getByName(groupName);
        currentContext.load(group);

        var groupUsers = group.get_users();
        currentContext.load(groupUsers);

        currentContext.executeQueryAsync(OnSuccess,OnFailure);

        function OnSuccess(sender, args) {
            var userInGroup = false;
            var groupUserEnumerator = groupUsers.getEnumerator();
            while (groupUserEnumerator.moveNext()) {
                var groupUser = groupUserEnumerator.get_current();
                if (groupUser.get_id() == currentUser.get_id()) {
                    userInGroup = true;
                    break;
                }
            }  
            OnComplete(userInGroup);
        }

        function OnFailure(sender, args) {
            OnComplete(false);
        }    
}

function CheckCurrentUerGroup() 
{
console.log('CheckCurrentUerGroup called')
alert('CheckCurrentUerGroup called');
  IsCurrentUserMemberOfGroup("Students", function (isCurrentUserInGroup) {
    if(isCurrentUserInGroup)
    {
        //Redirect to a certain page
alert('ifCurrentUserinGroup');
        window.location = "https://www.youtube.com";
    }
  });

}


function testExecFunc() {
alert('testFunc');
}



SP.SOD.executeFunc('sp.js', 'SP.ClientContext',  CheckCurrentUerGroup());

</script>

How can I resolve this? Have been looking around for a while but not been successful. If i need to provide more info, please note

Answer 1

Try Using below SharePoint REST API Code:

function isCurrentUserMemberOfGroup(groupName) {
    var isUserInGroup = false;
    $.ajax({
        async: false,
        headers: { "accept": "application/json; odata=verbose" },
        method: "GET",
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/currentuser/groups",
        success: function (data) {
            data.d.results.forEach( function (value) {
                if (value.Title == groupName) {               
                     isUserInGroup = true;
                }
            });
        },
        error: function (response) {
            console.log(response.status);
        },
    });    
    return isUserInGroup;
}

How to Use:

var isAdmin = isCurrentUserMemberOfGroup("Site Owners");

if(isAdmin) {
    window.location = "http://www.yourSiteOwnerurl.com";    // If user is a Site Owner
} else {
    window.location = "http://www.yourSiteMemberurl.com";   // If user is not a Site Owner
}

How do I redirect with JavaScript?