我正在尝试获取鼠标方向功能。我想知道如何检查鼠标滚动顶部或底部方向。
每次检查身体是否向上或向下滚动:
if(scroll top... ) {
do something.....
}
if(scroll bottom... ) {
do something.....
}
CSS:
body {
height:1400px;
margin:0;
padding:0;
position:relative;
}
.get-direction-info-here {
width:150px;
height:30px;
background:red;
display:block;
font-size:14px;
line-height:30px;
color:#fff;
position:fixed;
top:0;
}
HTML:
<div class="get-direction-info-here">
Scroll direction: <!-- Scroll TOP --> / <!--Scroll Bottom-->
</div>
<div class="direction-info"> </div>
答案 0 :(得分:1)
您可以使用HTML5中的mouse wheel events来检测鼠标滚轮操作。上升/下降取决于增量是正(向上)还是负(向下滚动)。
window.onload = function() {
var directionInfo = document.getElementById("directionInfo");
if (directionInfo.addEventListener) {
directionInfo.addEventListener("mousewheel", MouseWheelHandler, false);
directionInfo.addEventListener("DOMMouseScroll", MouseWheelHandler, false);
}
else directionInfo.attachEvent("onmousewheel", MouseWheelHandler);
function MouseWheelHandler(e) {
// cross-browser wheel delta
var e = window.event || e;
var delta = Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)));
if(delta > 0)
directionInfo.innerText = 'Up';
else
directionInfo.innerText = 'Down';
return false;
}
}
.direction-info {
width:100px;
height:100px;
border:1px solid green;
}
<div id="directionInfo" class="direction-info"> </div>
答案 1 :(得分:0)
window.onload = function() {
var directionInfo = document.getElementById("directionInfo");
if (directionInfo.addEventListener) {
directionInfo.addEventListener("mousewheel", MouseWheelHandler, false);
directionInfo.addEventListener("DOMMouseScroll", MouseWheelHandler, false);
}
else directionInfo.attachEvent("onmousewheel", MouseWheelHandler);
function MouseWheelHandler(e) {
// cross-browser wheel delta
var e = window.event || e;
var delta = Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)));
if(delta > 0)
directionInfo.innerText = 'Up';
else
directionInfo.innerText = 'Down';
return false;
}
}
&#13;
.direction-info {
width:100px;
height:100px;
border:1px solid green;
}
&#13;
<div id="directionInfo" class="direction-info"> </div>
&#13;