我正在尝试使用Prototype中的“nth-child（n）”，就像我使用jQuery一样。代码示例如下......
function myFunction()
{
$$('div.amfinder-horizontal td:nth-child(1) select').simulate('click');
$$('div.amfinder-horizontal td:nth-child(1) select').simulate('change');
}
Event.observe(window,"load",myFunction);
不幸的是，这似乎没有选择元素（因为点击和更改不起作用）。当我把select的类放在那里时，它确实有用......但我不能使用这个类，需要通过nth-child来完成它。我相信：第一个和最后一个有效，但我总共需要6个才能做到这一点......即使这样，它也不会总是全部6个。
如果有人可以提供nth-child的例子以及它如何与Prototype一起使用，那就太棒了！
<div class="amfinder-horizontal" id="amfinder_529e1406aff23Container">
<table>
<tbody>
<tr>
<td>
<div class="dropdown-title">Year</div>
<div class="dropdown-element active">
<select name="finder[424]" id="finder-72--424" style="width: 101px;" class="active">
<option value="0">
Year
</option>
<option value="8736830">
2013
</option>
<option value="8734482">
2012
</option>
<option value="8734488">
2011
</option>
<option value="8734487">
2010
</option>
<option value="8734481">
2009
</option>
<option value="8734486">
2008
</option>
<option value="8734485">
2007
</option>
<option value="8734484">
2006
</option>
<option value="8734494">
2005
</option>
<option value="8734483">
2004
</option>
<option value="8734489">
2003
</option>
<option value="8734492">
2002
</option>
<option value="8734491">
2001
</option>
<option value="8734490">
2000
</option>
<option value="8734493">
1999
</option>
<option value="8734496">
1998
</option>
<option value="8734495">
1997
</option>
<option value="8734501">
1996
</option>
<option value="8734500">
1995
</option>
<option value="8734499">
1994
</option>
<option value="8734498">
1993
</option>
<option value="8734497">
1992
</option>
<option value="8734503">
1991
</option>
<option value="8734502">
1990
</option>
<option value="8734504">
1989
</option>
<option value="8734505">
1988
</option>
<option value="8734508">
1987
</option>
<option value="8734507">
1986
</option>
<option value="8734506">
1985
</option>
<option value="0">Year</option>
</select>
<span class="arrow"></span>
</div>
</td>
<td>
<div class="dropdown-title">Make</div>
<div class="dropdown-element">
<select name="finder[425]" id="finder-72--425" disabled="disabled" style="width:120px">
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
<option value="0">Make</option>
</select>
<span class="arrow"></span>
</div>
</td>
<td>
<div class="dropdown-title">Model</div>
<div class="dropdown-element">
<select name="finder[426]" id="finder-72--426" disabled="disabled" style="width:120px">
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
<option value="0">Model</option>
</select>
<span class="arrow"></span>
</div>
</td>
<td>
<div class="dropdown-title">Sub Model</div>
<div class="dropdown-element">
<select name="finder[427]" id="finder-72--427" disabled="disabled" style="width:120px">
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
<option value="0">Sub Model</option>
</select>
<span class="arrow"></span>
</div>
</td>
<td>
<div class="dropdown-title">Engine</div>
<div class="dropdown-element">
<select name="finder[428]" id="finder-72--428" disabled="disabled" style="width:120px">
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
<option value="0">Engine</option>
</select>
<span class="arrow"></span>
</div>
</td>
<td>
<div class="dropdown-title">Position</div>
<div class="dropdown-element">
<select name="finder[429]" id="finder-72--429" disabled="disabled" style="width:120px">
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
<option value="0">Position</option>
</select>
<span class="arrow"></span>
</div>
</td>
</tr>
<tr>
<td colspan="6">
<br>
<div class="amfinder-buttons" style="display:none">
<button id="findbtn" class="btn" title="Find" type="submit"><span><span>Find</span></span></button>
<button class="btn" name="reset" value="1" title="Reset" type="submit"><span><span>Reset</span></span></button>
</div>
</td>
</tr>
</tbody>
</table>
</div>
答案 0 :(得分：0)
您已使用过$次。
可能是造成问题的原因。
更改
$$('div.amfinder-horizontal td:nth-child(1) select').simulate('click');
$$('div.amfinder-horizontal td:nth-child(1) select').simulate('change');
到
$('div.amfinder-horizontal td:nth-child(1) select').simulate('click');
$('div.amfinder-horizontal td:nth-child(1) select').simulate('change');
答案 1 :(得分：0)
您可以像数组样式一样选择它们
http://jsbin.com/eDAWaji/1/edit
HTML：
<ol class="myclass">
<li>lista</li>
<li>lista</li>
<li>lista</li>
<li>lista</li>
<li>lista</li>
</ol>
JS：
var li = $$('body > ol.myclass li');
li[3].style.background = 'red';
答案 2 :(得分：0)
$$()是CSS选择器方法，它返回一个元素数组
$$('div.amfinder-horizontal td:nth-child(1) select').simulate('click');
将无效，因为您无法在阵列上运行模拟
只要你加载了Event.simulate
，这应该可行$$('div.amfinder-horizontal td:nth-child(1) select').invoke('simulate','click');