window.scroll events triggering twice
No matter what method I use to detect scrolling on the page the event is triggered twice. Please see the code for the different methods I have tried.
<body onmousewheel="alert('Why are you alerting twice?')">
or
<script src="js/jquery-1.8.3.min.js"></script>
<script>
$(window).scroll(function(){
alert("Why are you alerting twice?");
});
</script>
or
window.onscroll = please_scroll;
function please_scroll() {
alert("Why are you alerting twice?");
}
I have even tried using $.debounce.
In case it is of any use I will explain what I am trying to do: When the user scrolls the wheel either up or down, the page will animate the scroll to the next full width content div. I have code that is successfully doing this onclick of my menu, but I would also like it to happen as the user scrolls, essentially auto assisting them with scrolling to each part of my page. This is the function I currently have for scrolling:
function scrollTo(id){
// Scroll
$('html,body').animate({scrollTop: $("#"+id).offset().top - 110},'slow',function(){
animation_active = "false";
});
}
Answer
many devices can trigger scroll events which appear to happen once more often. simply use a timeout for that:
var timeout;
$(window).scroll(function() {
clearTimeout(timeout);
timeout = setTimeout(function() {
// do your stuff
}, 50);
});
you can play with the value 50, i recommend something between 50 and 150.