javascript $(window).scroll() 在页面加载时触发
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$(window).scroll() firing on page load
提问by Mild Fuzz
Is there a way to prevent $(window).scroll()from firing on page load?
有没有办法防止$(window).scroll()在页面加载时触发？
Testing the following code in Firefox 4, it fires even when I unplug the mouse.
在 Firefox 4 中测试以下代码，即使我拔下鼠标，它也会触发。
jQuery(document).ready(function($){
$(window).scroll(function(){
console.log("Scroll Fired");
});
});
回答by Wladimir Palant
The scrollevent is unrelated to the mouse, it is called whenever a new document scrolling position is set. And arguably that position is set when the document loads (you might load it with an anchor after all), also if the user presses a cursor key on his keyboard. I don't know why you need to ignore the initial scrollevent but I guess that you only want to do it if pageYOffsetis zero. That's easy:
该scroll事件与鼠标无关，只要设置了新的文档滚动位置，就会调用它。并且可以说该位置是在文档加载时设置的（毕竟您可能会使用锚点加载它），如果用户按下键盘上的光标键也是如此。我不知道为什么您需要忽略初始scroll事件，但我想您只想在pageYOffset为零时才这样做。这很容易：
var oldPageYOffset = 0;
$(window).scroll(function(){
if (window.pageYOffset != oldPageYOffset)
{
oldPageYOffset = window.pageYOffset;
console.log("Window scrolling changed");
}
});
Note: MSIE doesn't have window.pageYOffsetproperty so the above will need to be adjusted. Maybe jQuery offers a cross-browser alternative.
注意：MSIE 没有window.pageYOffset属性，因此需要调整以上内容。也许 jQuery 提供了一种跨浏览器的替代方案。
回答by Mild Fuzz
This was the solution I went for. Any improvements gratefully received.
这是我寻求的解决方案。感谢您收到任何改进。
var scroll = 0;
$(window).scroll(function(){
if (scroll>0){
console.log("Scroll Fired");
}
scroll++;
});
回答by Juan Mendes
The scroll event does not fire on every load, only when refreshing a page that was scrolled, or when navigating to an anchor directly.
scroll 事件不会在每次加载时触发，只有在刷新滚动的页面或直接导航到锚点时才会触发。
Many of the answers suggest ignore the first time it's called, which would ignore a valid scroll if the page doesn't get scrolled initially.
许多答案建议在第一次调用时忽略，如果页面最初没有滚动，则会忽略有效的滚动。
//Scroll the page and then reload just the iframe (right click, reload frame)
//Timeout of 1 was not reliable, 10 seemed to be where I tested it, but again, this is not very elegant.
//This will not fire initially
setTimeout(function(){
$(window).scroll(function(){
console.log('delayed scroll handler');
});
}, 10);
//This will fire initially when reloading the page and re-establishing the scroll position
$(window).scroll(function(){
console.log('regular scroll handler');
});div {
height: 2000px;
border: 1px solid red;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
</div>回答by JaredM
This seems to have worked for me.
这似乎对我有用。
$(window).bind("load", function() {
$(window).on("scroll", function () {
console.log('scroll');
});
});
回答by Gidon Wise
sure, don't load it until after the load. make it a call back for sleep for 500 millis.
当然，在加载之后才加载它。让它回调睡眠 500 毫秒。
