jquery：检测滚动位置
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jquery : detecting scroll position
提问by Mag
I want to get an alert when, while scrolling, my footer comes to view.
我想在滚动时看到我的页脚时收到警报。
$(window).on("mousewheel", function(){
if ($(window).scrollTop() + $(window).height() > $('#footer').position().top){
alert("footer visible");
}
else{
alert("footer invisible");
}
});
All conditions with height seem right, but not during scrolling.
所有具有高度的条件似乎都正确，但在滚动期间则不然。
回答by SarathSprakash
回答by Alex Tselegidis
There is a jquery plugin for this task named jQuery Waypoints (http://imakewebthings.com/jquery-waypoints/)
此任务有一个名为 jQuery Waypoints 的 jquery 插件（http://imakewebthings.com/jquery-waypoints/）
$('#footer').waypoint(function(direction) {
alert('Top of thing hit top of viewport.');
});
回答by kasper Taeymans
here is a working fiddle... http://jsfiddle.net/kasperfish/JRUnr/14/
这是一个工作小提琴...... http://jsfiddle.net/kasperfish/JRUnr/14/
it is hacked together but it works
它被黑客攻击在一起，但它有效
flag=true;
$(window).scroll(function() {
st=$(window).scrollTop();
$('#topscroll').html(st)
if(st>1450){
if(flag)
alert('test');flag=false;
}
});
