[英]Horizontal scroll only if necessary
我有一个水平滚动页面,其中指示箭头滚动。 我正在使用下面的代码,效果很好。
HTML:
<div id="container">
<div id="parent">
<div class="contentBlock">1</div>
<div class="contentBlock">2</div>
<div class="contentBlock">3</div>
<div class="contentBlock">4</div>
<div class="contentBlock">5</div>
</div>
<span id="panLeft" class="panner" data-scroll-modifier='-1'>Left</span>
<span id="panRight" class="panner" data-scroll-modifier='1'>Right</span>
CSS:
#container{
width:600px;
overflow-x:hidden;
}
#parent {
width:6000px;
}
.contentBlock {
font-size:10em;
text-align:center;
line-height:400px;
height:400px;
width:500px;
margin:10px;
border:1px solid black;
float:left;
}
.panner {
border:1px solid black;
display:block;
position:fixed;
width:50px;
height:50px;
top:45%;
}
.active {
color:red;
}
#panLeft {
left:0px;
}
#panRight {
right:0px;
}
使用Javascript:
(function () {
var scrollHandle = 0,
scrollStep = 5,
parent = $("#container");
//Start the scrolling process
$(".panner").on("mouseenter", function () {
var data = $(this).data('scrollModifier'),
direction = parseInt(data, 10);
$(this).addClass('active');
startScrolling(direction, scrollStep);
});
//Kill the scrolling
$(".panner").on("mouseleave", function () {
stopScrolling();
$(this).removeClass('active');
});
//Actual handling of the scrolling
function startScrolling(modifier, step) {
if (scrollHandle === 0) {
scrollHandle = setInterval(function () {
var newOffset = parent.scrollLeft() + (scrollStep * modifier);
parent.scrollLeft(newOffset);
}, 10);
}
}
function stopScrolling() {
clearInterval(scrollHandle);
scrollHandle = 0;
}
}());
您也可以在此处的WordPress安装中查看代码: http : //ustria-steila.ch/test
箭头和滚动条非常好-但是我在不同的站点上放置了不同数量的文本和图像。 因此,有些页面需要水平滚动,而有些则不需要。 如何添加某种if条件以仅在水平溢出时显示箭头?
您的JavaScript代码应如下所示:
(function () {
var scrollHandle = 0,
scrollStep = 5,
parent = $("#container");
if(checkOverflow()){
$(".panner").show();
}
else
$(".panner").hide();
//Start the scrolling process
$(".panner").on("mouseenter", function () {
var data = $(this).data('scrollModifier'),
direction = parseInt(data, 10);
$(this).addClass('active');
startScrolling(direction, scrollStep);
});
//Kill the scrolling
$(".panner").on("mouseleave", function () {
stopScrolling();
$(this).removeClass('active');
});
//Actual handling of the scrolling
function startScrolling(modifier, step) {
if (scrollHandle === 0) {
scrollHandle = setInterval(function () {
var newOffset = parent.scrollLeft() + (scrollStep * modifier);
parent.scrollLeft(newOffset);
}, 10);
}
}
function stopScrolling() {
clearInterval(scrollHandle);
scrollHandle = 0;
}
function checkOverflow()
{
var el=document.getElementById('container');
var curOverflow = el.style.overflowX;
if ( !curOverflow || curOverflow === "visible" )
el.style.overflowX = "hidden";
var isOverflowing = el.clientWidth < el.scrollWidth;
el.style.overflowX = curOverflow;
return isOverflowing;
}
}());
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