我在玩Javascript标签系统。
当窗口宽度降到某个断点以下时,选项卡内容将插入到手风琴布局的链接之后,并且随着窗口宽度的增加,该过程将反向进行。
减小窗口大小时,一切都会按预期工作,但是随着增大窗口宽度,一切都会中断。以下代码导致了此问题tabBody.appendChild( tabBodyItems[k] );
。
3个.c-Tabs_BodyItem
元素中只有2个附加???
的HTML
<div class="c-Tabs" id="js-Tabs">
<div class="o-Container">
<div class="o-Row c-Tabs_Head">
<div class="o-Col-sm-4 c-Tabs_HeadItem">
<a href="" class="c-Tabs_Link">Link 1</a>
</div>
<div class="o-Col-sm-4 c-Tabs_HeadItem is-active">
<a href="" class="c-Tabs_Link">Link 2</a>
</div>
<div class="o-Col-sm-4 c-Tabs_HeadItem">
<a href="" class="c-Tabs_Link">Link 3</a>
</div>
</div>
<div class="c-Tabs_Body">
<div class="c-Tabs_BodyItem">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
<div class="c-Tabs_BodyItem is-active">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
<div class="c-Tabs_BodyItem">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
</div>
</div>
</div>
Java脚本
我不会显示实际制表系统的Javascript;这不是引起问题的原因。
function insertAfter( el, referenceNode )
{
referenceNode.parentNode.insertBefore( el, referenceNode.nextSibling );
}
function debounce( func, wait, immediate )
{
var timeout;
return function() {
var context = this, args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
}
var tabHeadItems = document.getElementsByClassName( 'c-Tabs_HeadItem' );
var tabBody = document.querySelector( '.c-Tabs_Body' );
var tabBodyItems = document.getElementsByClassName( 'c-Tabs_BodyItem' );
var isTabs = true;
function setTab()
{
if ( window.matchMedia( '(min-width: 768px)' ).matches && isTabs === false )
{
for( var k = 0, lenK = tabBodyItems.length; k < lenK; k++ )
{
tabBody.appendChild( tabBodyItems[k] );
}
isTabs = true;
}
else if ( window.matchMedia( '(max-width: 767px)' ).matches && isTabs === true )
{
for( var l = 0, lenL = tabBodyItems.length; l < lenL; l++ )
{
insertAfter( tabBodyItems[l], tabHeadItems[l] );
}
isTabs = false;
}
}
setTab();
var debounceSetTab = debounce(function() {
setTab();
}, 250 );
window.addEventListener( 'resize', debounceSetTab );
其原因是,getElementsByClassName
返回现场 NodeList
。这意味着随着DOM的更改,更改的内容NodeList
会反映出来。元素的顺序tabBodyItems
基于它们在DOM中的位置,因此,当您在DOM中四处移动元素时,它们的索引会tabBodyItems
发生变化以反映这一点。这是在循环遍历集合时发生的for
,因此您跳过了元素,因为它们被重新编号了。
最简单的解决方法是使用document.querySelectorAll
而不是document.getElementsByClassName
。这将返回一个static NodeList
。
function insertAfter( el, referenceNode )
{
referenceNode.parentNode.insertBefore( el, referenceNode.nextSibling );
}
function debounce( func, wait, immediate )
{
var timeout;
return function() {
var context = this, args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
}
var tabHeadItems = document.querySelectorAll( '.c-Tabs_HeadItem' );
var tabBody = document.querySelector( '.c-Tabs_Body' );
var tabBodyItems = document.querySelectorAll( '.c-Tabs_BodyItem' );
var isTabs = true;
function setTab()
{
if ( window.matchMedia( '(min-width: 768px)' ).matches && isTabs === false )
{
for( var k = 0, lenK = tabBodyItems.length; k < lenK; k++ )
{
tabBody.appendChild( tabBodyItems[k] );
}
isTabs = true;
}
else if ( window.matchMedia( '(max-width: 767px)' ).matches && isTabs === true )
{
for( var l = 0, lenL = tabBodyItems.length; l < lenL; l++ )
{
insertAfter( tabBodyItems[l], tabHeadItems[l] );
}
isTabs = false;
}
}
setTab();
var debounceSetTab = debounce(function() {
setTab();
}, 250 );
window.addEventListener( 'resize', debounceSetTab );
<div class="c-Tabs" id="js-Tabs">
<div class="o-Container">
<div class="o-Row c-Tabs_Head">
<div class="o-Col-sm-4 c-Tabs_HeadItem">
<a href="" class="c-Tabs_Link">Link 1</a>
</div>
<div class="o-Col-sm-4 c-Tabs_HeadItem is-active">
<a href="" class="c-Tabs_Link">Link 2</a>
</div>
<div class="o-Col-sm-4 c-Tabs_HeadItem">
<a href="" class="c-Tabs_Link">Link 3</a>
</div>
</div>
<div class="c-Tabs_Body">
<div class="c-Tabs_BodyItem" id="body1">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
<div class="c-Tabs_BodyItem is-active" id="body2">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
<div class="c-Tabs_BodyItem"id="body3">
<ul>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</li>
</ul>
</div>
</div>
</div>
</div>
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