LogItemUsage.js

function logItemUsage(itemId, listName) {
  SP.SOD.executeOrDelayUntilScriptLoaded(function() {
    var stuff = {
      ctx: SP.ClientContext.get_current()
    };
    stuff.user = stuff.ctx.get_web().get_currentUser();
    stuff.ctx.load(stuff.user);
    stuff.scope = "{00000000-0000-0000-0000-000000000000}";
    stuff.site = stuff.ctx.get_site();
    stuff.ctx.load(stuff.site);
    
    this.stuff.ctx.executeQueryAsync(
      function () {
      
        stuff.siteId = stuff.site.get_id();
        var itemUrl = _spPageContextInfo.webAbsoluteUrl + "/Lists/" + listName + "/DispForm.aspx?ID=" + itemId;
        
        SP.Analytics.AnalyticsUsageEntry.logAnalyticsEvent2(
          stuff.ctx,
          1,
          itemUrl,
          stuff.scope,
          stuff.siteId,
          stuff.user
        );
        
        stuff.ctx.executeQueryAsync(
          function() {
            console.log("Logged: " + itemUrl);
          }, function (s, a) {
            console.log(a.get_message());
          }
        
      }, function (s, a) {
        console.log(a.get_message());
      }
    );
    
  }, "SP.js");
}