javascript - Determine if element is on screen -

Is there a way to determine whether the current element appears with the use of jQuery on the user's screen / viewport? (Not using other external libraries)

Not directly using the default jQuery, but you You can implement your own function, which you can use later on a jQuery element:

  (function ($) {$ .fn.isOnScreen = function () {var Topview = $ (Window) .scrollTop (); var botView = TopVV + $ (window) .it (); var top element = this.offetset (top); topBotAllimate = top element + this.height (); Return (Boatley Ent & lt; = Botwu) & amp; amp; amp; & amp; (Topelement & gt; = TOP weave));}}) (jQuery);   
 After adding this code, you can call  $ ('#ElementId'). IsOnScreen ()  will return  true  if the whole element is on the screen and  false  if it is not. 
 
 You can play with it a bit, so it will return  true , if for at least one example: 
 
  (Function ($) {$ .fn.isOnScreen = function () {var topview = $ (window) .scrollTop ()); Var botView = Top Viv + $ (window). height (); Var top element = this.offet (). Top; Var bottlement = top element + (this.height () / 4); // & lt; --- Returns ((Botlement & Lt; = botview) & amp; amp; (top element & gt; = top view));}}) ();