Hi @suresh91 

This should work:

HTML:

<div >
<label><input type="checkbox" ng-model="chkbx" ng-checked="data.u_customfield" ng-click="c.checkNotify(chkbx)"> testing</label>
</div>

Client:

api.controller=function($scope) {
	/* widget controller */
	var c = this;


	c.checkNotify = function(val) {


		c.data.action = "getField";
		c.data.value =  val;


		alert("test Before " + val);

		c.server.update().then(function(response){
			alert("test After " + response.u_customfield);

		})
	}
}

Server:

(function() {

	if (input){
		if (input.action == "getField"){
			var gr_notify = new GlideRecord('sys_user');
			gr_notify.addQuery('sys_id', gs.getUserID());
			gr_notify.query();
			if(gr_notify.next())
			{
				gs.addInfoMessage(gr_notify.getDisplayValue())
				data.u_customfield = gr_notify.u_customfield;
				return data;
			}
		}
	}

})();