如果页面已向下滚动200px，则需要触发事件（jQuery）

Question

I want to show and hide a piece of code if i scroll and the page is for example half way, i have tried to use window scroll but this doesnt works(no errors, clean code, different browsers, different jQuery versions), but this doesn't trigger anything, so i am looking for a better way to show and hide a div if i scrolldown.

used this to trigger an event(not working)

$(window).scroll(function(){
    alert('works')
});

Answer 1

Try using the window.onload function (that's how they use it in jQuery examples):

window.onload = (function(){
  $(window).scroll(function () { 
    if( $(window).scrollTop() > 200 ) {
      // Display something
    }
  })
})