Add group to list using SharePoint 2010 JSOM - sharepoint

Question

Can someone give me an example of adding a SharePoint group to a list using the javascript client object model. I was able to create groups and add them to the site but I haven't seen any documentation on adding the groups to a list? I know how to do this via c# but not javascript.

Answer 1

How to grant permissions for Group in List via CSOM (JavaScript) in SharePoint 2013
The following example demonstrates how to grant Contribute permissions for group Approvers in list:
var context = SP.ClientContext.get_current();
var web = context.get_web();
var list = web.get_lists().getByTitle(listTitle);
var group = web.get_siteGroups().getByName("Approvers");
var roleDef = web.get_roleDefinitions().getByType(SP.RoleType.contributor);
var roleDefBindings = SP.RoleDefinitionBindingCollection.newObject(context);
roleDefBindings.add(roleDef);
list.get_roleAssignments().add(group,roleDefBindings);
list.update();
context.load(group);
context.load(list);
context.load(roleDef);
context.executeQueryAsync(
function () {
console.log('For group ' + group.get_title() + ' has been granted ' + roleDef.get_name() + ' permissons in List ' + list.get_title());
},
function (sender, args) {
console.log("Error: " + args.get_message());
}
);
Since SP.GroupCollection does not contain the method getByName in SharePoint 2010, use the method SP.GroupCollection.getById(id) instead to return Group client object:
var group = web.get_siteGroups().getById(16); //get Approvers group by Id

Answer 2

function getGroupByName(groupName, completeFunction) {
if (groupName == null) {
throw new Error("Group Name cannot be null");
}
var rv = null;
var currentContext = SP.ClientContext.get_current();
var currentWeb = currentWeb = currentContext.get_web();
var allGroups = currentWeb.get_siteGroups();
currentContext.load(allGroups);
currentContext.executeQueryAsync(getGroupByName_Success, getGroupByName_Failed);
function getGroupByName_Success() {
var groupEnumerator = allGroups.getEnumerator();
while (groupEnumerator.moveNext()) {
rv = groupEnumerator.get_current();
var groupTitle = rv.get_title();
if (groupTitle == groupName) {
groupFound = true;
break;
}
}
if (groupFound == false) {
rv = null;
}
completeFunction(rv);
}
function getGroupByName_Failed(sender, args) {
alert("Error Occurred: " + args.get_message() + "\n" + args.get_stackTrace());
}
}