根据按钮点击移动到特定 div
Move to specific div based on button click
我试图根据上一个和下一个按钮移动 div(这里是问题编号)。以便所选问题始终在屏幕上可见。
这是演示:http://jsfiddle.net/arunslb123/trxe4n3u/12/
屏幕:
单击并问题编号,然后单击上一个或下一个按钮以了解我的问题。
我的代码:
$("#next")
.click(function () {
$(".c.current-question")
.each(function () {
var divIdx = $(this)
.attr('id');
var scrollTo = $('#' + divIdx)
.position()
.left;
$("#scrollquestion")
.animate({
'scrollLeft': scrollTo
}, 800);
});
});
$("#prev")
.click(function () {
$(".c.current-question")
.each(function () {
var divIdx = $(this)
.attr('id');
var scrollTo = $('#' + divIdx)
.position()
.left;
$("#scrollquestion")
.animate({
'scrollLeft': -scrollTo
}, 800);
});
});
使用scrollLeft
有点棘手。我根据定位对您的用例进行了一次小重做,然后根据容器的 left
移动它。棘手的部分是在滚动到最右边时可靠地计算负位置。另外,需要考虑宽度和边距。
检查下面的片段:
var $wrap = $("#numWrap"), $strip = $("#strip"),
$leftArrow = $(".wrapper > .arrows").first(),
wrapWidth = $wrap.width() + $leftArrow.width(),
margin = 10;
fill(20); select($(".numberItem").first());
$strip.on("click", ".numberItem", function() { select($(this)); });
function select($elem) {
$(".numberItem").removeClass("selected");
$elem.addClass("visited").addClass("selected");
focus($elem[0]);
}
function focus(elem) {
var stripPos = $strip.position(),
numPos = $(elem).offset(),
elemWidth = $(elem).width() + margin,
numRight = numPos.left + elemWidth;
if (numRight > wrapWidth) {
$strip.css({"left": stripPos.left - elemWidth});
}
if (numPos.left < (margin + $leftArrow.width())) {
$strip.css({"left": stripPos.left + elemWidth});
}
}
$(".wrapper").on("click", "a.arrow", function() {
var stripPos = $strip.position();
if (this.id == "lft") {
$strip.css({"left": stripPos.left + (wrapWidth / 2)});
} else {
$strip.css({"left": stripPos.left - (wrapWidth / 2)});
}
});
$(".controls").on("click", "a.arrow", function() {
var $sel = $(".selected"), numPos, $sel, elemWidth;
$elem = $sel.length > 0 ? $sel.first() : $(".numberItem").first();
if (this.id == "lft") {
$sel = $elem.prev().length > 0 ? $elem.prev() : $elem;
select($sel);
} else {
$sel = $elem.next().length > 0 ? $elem.next() : $elem;
select($sel);
}
numPos = $sel.offset(); elemWidth = $sel.width() + margin;
numRight = numPos.left + elemWidth;
if (numPos.left > wrapWidth) {
$strip.css({"left": -($sel.text()) * $sel.width() });
}
if (numRight < 0) {
$strip.css({"left": +($sel.text()) * $sel.width() });
}
});
function fill(num){
for (var i = 1; i <= num; i++) {
var $d = $("<a href='#' class='numberItem'>" + i + "</a>");
$strip.append($d);
}
}
* { box-sizing: border-box; padding: 0; margin: 0; font-family: sans-serif; }
div.wrapper {
background-color: #ddd; width: 100vw; height: 64px;
clear: both; overflow: hidden; margin-top: 16px;
}
div.arrows {
float: left; width: 10%; min-width: 24px; height: 64px; line-height: 64px;
text-align: center; vertical-align: middle; overflow: hidden;
}
div.numWrap {
float: left; height: 64px; line-height: 64px;
width: 80%; vertical-align: middle;
overflow: hidden; position: relative;
}
div.strip {
position: absolute; left: 0px;
width: auto; white-space: nowrap;
transition: left 1s;
}
a.numberItem {
display: inline-block; text-align: center; margin: 0px 8px;
background-color: #fff; border-radius: 50%; width: 48px; height: 48px;
font-size: 1.2em; line-height: 48px; text-decoration: none;
}
a.numberItem.visited { background-color: #fff; color: #000; border: 2px solid #01aebc; }
a.numberItem.selected { background-color: #01aebc; color: #fff; }
div.controls { clear: both; }
div.controls > div.arrows { width: auto; margin: 0 12px; }
a, a:focus, a:active, a:link, a:visited {
display: inline-block;
text-decoration: none; font-weight: 600;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<div class="arrows">
<a id="lft" class="arrow" href="#">〈</a>
</div>
<div id="numWrap" class="numWrap">
<div id="strip" class="strip"></div>
</div>
<div class="arrows">
<a id="rgt" class="arrow" href="#">〉</a>
</div>
</div>
<div class="controls">
<div class="arrows">
<a id="lft" class="arrow" href="#">〈 Previous</a>
</div>
<div class="arrows">
<a id="rgt" class="arrow" href="#">Next 〉</a>
</div>
<div>
解释:
- 在数字容器上使用
absolute
定位,嵌套得到100%
宽度
标记:
<div class="wrapper">
<div class="arrows"><a id="lft" class="arrow" href="#">〈</a></div>
<div id="numWrap" class="numWrap">
<div id="strip" class="strip"></div> <!-- nesting here -->
</div>
<div class="arrows"><a id="rgt" class="arrow" href="#">〉</a></div>
</div>
CSS:
div.wrapper {
background-color: #ddd; width: 100vw; height: 64px;
clear: both; overflow: hidden; margin-top: 16px;
}
div.arrows {
float: left; width: 10%; min-width: 24px; height: 64px; line-height: 64px;
text-align: center; vertical-align: middle; overflow: hidden;
}
div.numWrap {
float: left; height: 64px; line-height: 64px;
width: 80%; vertical-align: middle;
overflow: hidden; position: relative; /* relatively positioned */
}
div.strip {
position: absolute; left: 0px; /* absolutely positioned */
width: auto; white-space: nowrap;
transition: left 1s; /* instead of jquery animate */
}
有了这个结构,我们现在可以使用left
来控制滚动了。
- 对于部分被遮挡的数字,请尝试轻轻地将焦点对准(微移到视图中)部分被遮挡的数字。这可以通过检查
position
相对于父级并向其添加 width/margin 并考虑左箭头的宽度(它可能会透过)来完成。
Javascript:
function focus(elem) {
var stripPos = $strip.position(),
numPos = $(elem).offset(),
elemWidth = $(elem).width() + margin,
numRight = numPos.left + elemWidth;
// if it is towards right side, nudge it back inside
if (numRight > wrapWidth) {
$strip.css({"left": stripPos.left - elemWidth});
}
// if it is towards left side, nudge it back inside
if (numPos.left < (margin + $leftArrow.width())) {
$strip.css({"left": stripPos.left + elemWidth});
}
}
- 一旦用户将列表滚动得太远然后尝试单击 上一个/下一个 按钮到 select 个问题,那么我们需要移动整个容器最多 selected 编号。我们可以很容易地做到这一点,方法是将问题编号乘以元素宽度,然后将
left
更改为正数(if 向右 )或负数(if 向右左).
Javascript:
// if left of element is more than the width of parent
if (numPos.left > wrapWidth) {
$strip.css({"left": -($sel.text()) * $sel.width() });
}
// if right of element is less than 0 i.e. starting position
if (numRight < 0) {
$strip.css({"left": +($sel.text()) * $sel.width() });
}
这里有一个 fiddle 可以玩:http://jsfiddle.net/abhitalks/aw166qhx/
您需要进一步使其适应您的用例,但您明白了。
我试图根据上一个和下一个按钮移动 div(这里是问题编号)。以便所选问题始终在屏幕上可见。
这是演示:http://jsfiddle.net/arunslb123/trxe4n3u/12/
屏幕:
单击并问题编号,然后单击上一个或下一个按钮以了解我的问题。
我的代码:
$("#next")
.click(function () {
$(".c.current-question")
.each(function () {
var divIdx = $(this)
.attr('id');
var scrollTo = $('#' + divIdx)
.position()
.left;
$("#scrollquestion")
.animate({
'scrollLeft': scrollTo
}, 800);
});
});
$("#prev")
.click(function () {
$(".c.current-question")
.each(function () {
var divIdx = $(this)
.attr('id');
var scrollTo = $('#' + divIdx)
.position()
.left;
$("#scrollquestion")
.animate({
'scrollLeft': -scrollTo
}, 800);
});
});
使用scrollLeft
有点棘手。我根据定位对您的用例进行了一次小重做,然后根据容器的 left
移动它。棘手的部分是在滚动到最右边时可靠地计算负位置。另外,需要考虑宽度和边距。
检查下面的片段:
var $wrap = $("#numWrap"), $strip = $("#strip"),
$leftArrow = $(".wrapper > .arrows").first(),
wrapWidth = $wrap.width() + $leftArrow.width(),
margin = 10;
fill(20); select($(".numberItem").first());
$strip.on("click", ".numberItem", function() { select($(this)); });
function select($elem) {
$(".numberItem").removeClass("selected");
$elem.addClass("visited").addClass("selected");
focus($elem[0]);
}
function focus(elem) {
var stripPos = $strip.position(),
numPos = $(elem).offset(),
elemWidth = $(elem).width() + margin,
numRight = numPos.left + elemWidth;
if (numRight > wrapWidth) {
$strip.css({"left": stripPos.left - elemWidth});
}
if (numPos.left < (margin + $leftArrow.width())) {
$strip.css({"left": stripPos.left + elemWidth});
}
}
$(".wrapper").on("click", "a.arrow", function() {
var stripPos = $strip.position();
if (this.id == "lft") {
$strip.css({"left": stripPos.left + (wrapWidth / 2)});
} else {
$strip.css({"left": stripPos.left - (wrapWidth / 2)});
}
});
$(".controls").on("click", "a.arrow", function() {
var $sel = $(".selected"), numPos, $sel, elemWidth;
$elem = $sel.length > 0 ? $sel.first() : $(".numberItem").first();
if (this.id == "lft") {
$sel = $elem.prev().length > 0 ? $elem.prev() : $elem;
select($sel);
} else {
$sel = $elem.next().length > 0 ? $elem.next() : $elem;
select($sel);
}
numPos = $sel.offset(); elemWidth = $sel.width() + margin;
numRight = numPos.left + elemWidth;
if (numPos.left > wrapWidth) {
$strip.css({"left": -($sel.text()) * $sel.width() });
}
if (numRight < 0) {
$strip.css({"left": +($sel.text()) * $sel.width() });
}
});
function fill(num){
for (var i = 1; i <= num; i++) {
var $d = $("<a href='#' class='numberItem'>" + i + "</a>");
$strip.append($d);
}
}
* { box-sizing: border-box; padding: 0; margin: 0; font-family: sans-serif; }
div.wrapper {
background-color: #ddd; width: 100vw; height: 64px;
clear: both; overflow: hidden; margin-top: 16px;
}
div.arrows {
float: left; width: 10%; min-width: 24px; height: 64px; line-height: 64px;
text-align: center; vertical-align: middle; overflow: hidden;
}
div.numWrap {
float: left; height: 64px; line-height: 64px;
width: 80%; vertical-align: middle;
overflow: hidden; position: relative;
}
div.strip {
position: absolute; left: 0px;
width: auto; white-space: nowrap;
transition: left 1s;
}
a.numberItem {
display: inline-block; text-align: center; margin: 0px 8px;
background-color: #fff; border-radius: 50%; width: 48px; height: 48px;
font-size: 1.2em; line-height: 48px; text-decoration: none;
}
a.numberItem.visited { background-color: #fff; color: #000; border: 2px solid #01aebc; }
a.numberItem.selected { background-color: #01aebc; color: #fff; }
div.controls { clear: both; }
div.controls > div.arrows { width: auto; margin: 0 12px; }
a, a:focus, a:active, a:link, a:visited {
display: inline-block;
text-decoration: none; font-weight: 600;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<div class="arrows">
<a id="lft" class="arrow" href="#">〈</a>
</div>
<div id="numWrap" class="numWrap">
<div id="strip" class="strip"></div>
</div>
<div class="arrows">
<a id="rgt" class="arrow" href="#">〉</a>
</div>
</div>
<div class="controls">
<div class="arrows">
<a id="lft" class="arrow" href="#">〈 Previous</a>
</div>
<div class="arrows">
<a id="rgt" class="arrow" href="#">Next 〉</a>
</div>
<div>
解释:
- 在数字容器上使用
absolute
定位,嵌套得到100%
宽度
标记:
<div class="wrapper">
<div class="arrows"><a id="lft" class="arrow" href="#">〈</a></div>
<div id="numWrap" class="numWrap">
<div id="strip" class="strip"></div> <!-- nesting here -->
</div>
<div class="arrows"><a id="rgt" class="arrow" href="#">〉</a></div>
</div>
CSS:
div.wrapper {
background-color: #ddd; width: 100vw; height: 64px;
clear: both; overflow: hidden; margin-top: 16px;
}
div.arrows {
float: left; width: 10%; min-width: 24px; height: 64px; line-height: 64px;
text-align: center; vertical-align: middle; overflow: hidden;
}
div.numWrap {
float: left; height: 64px; line-height: 64px;
width: 80%; vertical-align: middle;
overflow: hidden; position: relative; /* relatively positioned */
}
div.strip {
position: absolute; left: 0px; /* absolutely positioned */
width: auto; white-space: nowrap;
transition: left 1s; /* instead of jquery animate */
}
有了这个结构,我们现在可以使用left
来控制滚动了。
- 对于部分被遮挡的数字,请尝试轻轻地将焦点对准(微移到视图中)部分被遮挡的数字。这可以通过检查
position
相对于父级并向其添加 width/margin 并考虑左箭头的宽度(它可能会透过)来完成。
Javascript:
function focus(elem) {
var stripPos = $strip.position(),
numPos = $(elem).offset(),
elemWidth = $(elem).width() + margin,
numRight = numPos.left + elemWidth;
// if it is towards right side, nudge it back inside
if (numRight > wrapWidth) {
$strip.css({"left": stripPos.left - elemWidth});
}
// if it is towards left side, nudge it back inside
if (numPos.left < (margin + $leftArrow.width())) {
$strip.css({"left": stripPos.left + elemWidth});
}
}
- 一旦用户将列表滚动得太远然后尝试单击 上一个/下一个 按钮到 select 个问题,那么我们需要移动整个容器最多 selected 编号。我们可以很容易地做到这一点,方法是将问题编号乘以元素宽度,然后将
left
更改为正数(if 向右 )或负数(if 向右左).
Javascript:
// if left of element is more than the width of parent
if (numPos.left > wrapWidth) {
$strip.css({"left": -($sel.text()) * $sel.width() });
}
// if right of element is less than 0 i.e. starting position
if (numRight < 0) {
$strip.css({"left": +($sel.text()) * $sel.width() });
}
这里有一个 fiddle 可以玩:http://jsfiddle.net/abhitalks/aw166qhx/
您需要进一步使其适应您的用例,但您明白了。