Question

I’m trying to get the vertical position of the browser scroll bar with javascript. I am currently using the jquery scroll() function, but I feel like the callbacks are a bit slow, and I’m wondering if there is a faster, native way to use a callback when a user scrolls in the browser. Does anyone know?

Answer 1

If you feel the callback is taking too much time to run, you could throttle it. Just keep track of the time it was last called: http://jsfiddle.net/fjjAw/.

var lastCalled = 0;
$(window).on("scroll", function() {
  var now = Date.now();
  if(now - lastCalled > 1000) {  // only proceed if it has been one second since last call
    lastCalled = now;
    // do things
  }
});