javascript 滚动到下一部分
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提问by Matheus Souza
My code looks like this:
我的代码如下所示：
<div id="arrow">
<a class="next"></a>
<a class="previous"></a>
</div>
<section id="first">
...
</section>
<section id="second">
...
</section>
<section id="third">
...
</section>
The element #arrowhas position: fixed, and I'm trying to make the window scroll to the next sectionwhen a.nextis clicked.
该元素#arrow具有position: fixed，并且我试图section在a.next单击时使窗口滚动到下一个。
Ex: The first time a.nextis clicked, the window scrolls to section#first, the second time, the window scrolls to section#second, etc. The same thing happens to a.previous.
例如：第一次a.next点击，窗口滚动到section#first，第二次，窗口滚动到section#second，等等。同样的事情发生在a.previous。
Does someone know how to solve this problem?
有人知道如何解决这个问题吗？
Thanks a lot!
非常感谢！
EDIT
编辑
My JS code:
我的JS代码：
$('#arrows a.previous').click(function() {
$.scrollTo($(this).closest('section').prev(),800);
});
$('#arrows a.next').click(function() {
$.scrollTo($(this).closest('section').next(),800);
});
回答by Shlomi Hassid
You will need to handle to 3 events in this case:
在这种情况下，您需要处理 3 个事件：
- Current page position - updated each time.
- User scrolls manualy the page.
- User clicks the prev or next button.
- 当前页面位置 - 每次更新。
- 用户手动滚动页面。
- 用户单击上一个或下一个按钮。
2, 3 need to use the current page position and update him according to the direction that the page is scrolling.
2、3需要使用当前页面位置，根据页面滚动的方向更新他。
My quick demos : Vertical Version jsFiddle--- Horizontal Version jsFiddle
我的快速演示：垂直版本 jsFiddle--- 水平版本 jsFiddle
Vertical Version snippet :
垂直版本片段：
$(function(){
var pagePositon = 0,
sectionsSeclector = 'section',
$scrollItems = $(sectionsSeclector),
offsetTolorence = 30,
pageMaxPosition = $scrollItems.length - 1;
//Map the sections:
$scrollItems.each(function(index,ele) { $(ele).attr("debog",index).data("pos",index); });
// Bind to scroll
$(window).bind('scroll',upPos);
//Move on click:
$('#arrow a').click(function(e){
if ($(this).hasClass('next') && pagePositon+1 <= pageMaxPosition) {
pagePositon++;
$('html, body').stop().animate({
scrollTop: $scrollItems.eq(pagePositon).offset().top
}, 300);
}
if ($(this).hasClass('previous') && pagePositon-1 >= 0) {
pagePositon--;
$('html, body').stop().animate({
scrollTop: $scrollItems.eq(pagePositon).offset().top
}, 300);
return false;
}
});
//Update position func:
function upPos(){
var fromTop = $(this).scrollTop();
var $cur = null;
$scrollItems.each(function(index,ele){
if ($(ele).offset().top < fromTop + offsetTolorence) $cur = $(ele);
});
if ($cur != null && pagePositon != $cur.data('pos')) {
pagePositon = $cur.data('pos');
}
}
});section { min-height:800px; }
#arrow {
position:fixed;
right:0;
top:0;
background-color:black;
color:white;
}
#arrow a{
display:inline-block;
padding:10px 20px;
cursor:pointer;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div id="arrow">
<a class="next">next</a>
<a class="previous">prev</a>
</div>
<section style="background-color:green">...</section>
<section style="background-color:blue">...</section>
<section style="background-color:red">...</section>回答by Roko C. Buljan
All you need, to allow the user to use both arrows and scrollbar:
您只需要允许用户同时使用箭头和滚动条：
var $sec = $("section");
$(".prev, .next").click(function(){
var y = $sec.filter(function(i, el) {
return el.getBoundingClientRect().bottom > 0;
})[$(this).hasClass("next")?"next":"prev"]("section").offset().top;
$("html, body").stop().animate({scrollTop: y});
});*{margin:0;padding:0;}
#arrow{
position:fixed;
width:100%;
text-align:center;
}
#arrow a{
display:inline-block;
background: tomato;
padding:6px 15px;
border-radius:3px;
cursor:pointer;
}
section{
height:1200px;
border:3px solid #444;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="arrow"><a class="prev">↑</a><a class="next">↓</a></div>
<section>1</section>
<section style="height:500px;">2</section>
<section>3</section>
<section style="height:600px;">4</section>
<section>5</section>To explain the jQuery a bit:
稍微解释一下 jQuery：
// Cache your selectors
var $sec = $("section");
// On any of both arrows click
$(".prev, .next").click(function(){
// We need to get current element
// before defining the `.next()` or `.prev()` element to target
// and get it's `offset().top` into an `y` variable we'll animate to.
// A current element is always the one which bottom position
// (relative to the browser top) is higher than 0.
var y = $sec.filter(function(i, el) {
return el.getBoundingClientRect().bottom > 0;
})[$(this).hasClass("next")?"next":"prev"]("section").offset().top;
// (Line above:) if the clicked button className was `"next"`,
// target the the `.next("section")`, else target the `.prev("section")`
// and retrieve it's `.offset().top`
$("html, body").stop().animate({scrollTop: y});
});
回答by Anis Boukhris
i have tried to do with .closest("section") but it only works when the section is a parent of the element you clicked so this is the best way i got
我曾尝试使用 .closest("section") 但它仅在该部分是您单击的元素的父级时才有效，所以这是我得到的最好方法
sections=$("section");
s=0;
$(".next").click(function() {
if(s<sections.length-1){
s++;
$('html, body').animate({
scrollTop: sections.eq(s).offset().top
}, 500);
}});
$(".previous").click(function() {
if(s>0){
s--;
$('html, body').animate({
scrollTop: sections.eq(s).offset().top
}, 500);
}});section{
background-color:#bbb;
width:100%;
height:700px;
border-bottom:2px solid #eee;
}
#arrow{
position:fixed;
}
#first{
background-color: red;
}
#second{
background-color:green;
}
#third{
background-color: blue;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="arrow">
<a class="next">next</a>
<a class="previous">prev</a>
</div>
<section id="first">
...
</section>
<section id="second">
...
</section>
<section id="third">
...
</section>