在其他浮点数之前插入(使用 AJAX)浮点<li>元素<li>而不移动它们

Question

所以我有一堆Li元素看起来像：

<div id="previous_button">
    <a href="javascript:void(0)" id="previous">Previous</a>
</div>
<div id="slider-stage">
    <ul id="slider-list">
        <li>First</li>
        <li>Second</li>
        <li>Third</li>
        <li>Fourth</li>
        <li>Fifth</li>
        <li>Sixth</li>
    </ul>
</div>
<div id="next_button">
    <a href="javascript:void(0)" id="next">Next</a>
</div>

和CSS：

#slider-stage
{
    float: left;
    width:825px;
    overflow:auto;
    overflow-x:hidden;
    overflow-y:hidden;
    height:235px;
    margin:0 auto;
}
#slider-list
{
    width: 1200px;
    border:0;
    margin:0;
    padding:0;
}
#slider-list li
{
    list-style:none;
    margin:0;
    padding:0;
    border:0;
    margin-right:15px;
    background: grey;
    background-size: 150px 235px;
    float:left;
    width:150px;
    height:235px;
}
#previous_button
{
    float: left;
    height: 235px;
    margin-right: 15px;
}
#next_button
{
    float: left;
    height: 235px;
    margin-right: 15px;
}

当边缘左翼变化时，整个滑块列表移动：

window.addEvent('domready', function()
{ 
    var totIncrement = 0;
    var increment = 165;
    var maxRightIncrement = increment*(-2);
    var fx = new Fx.Tween('slider-list',
    {    
        duration: '500',
        property: 'margin-left'
    });
    // Previous Button
    document.id('previous').addEvent
    ('click', function(event)
    { 
        if(totIncrement<0)
        { 
            totIncrement = totIncrement + increment;
            fx.start(totIncrement);
        }
    }); 
    // Next Button
    document.id('next').addEvent
    ('click', function(event)
    { 
        special = special + 1;
        if(totIncrement>maxRightIncrement)
        { 
            totIncrement = totIncrement - increment;
            fx.start(totIncrement);
        }
    });
}); ​

当添加新元素时，没有问题，当我尝试将其添加为第一个slider列表移动时。原因很明显，但是有什么方法可以避免这种情况？

Answer 1

当您将新元素添加到列表的开头时，将margin-left降低到新元素的宽度，有效地假装您向右滚动一次，从而将滑块保持在相同的位置：

$('new').addEvent('click', function(event) {
    Element('<li>New</li>', {text: 'New'})
        .inject($('slider-list'), 'top');
    $('slider-list').setStyle('margin-left', $('slider-list').getStyle('margin-left').toInt() - 165);
    totIncrement -= 165;
});

http://jsfiddle.net/kelervin/azjtu/