我目前有一个如下所示的ul列表:
<ul id="primary-nav">
<li class="navButton" id="amps_off_button" data-order="6">
<span class="navButton-color red"><p>AMPS Off</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="amps_alarms" data-order="7">
<span class="navButton-color"><p>AMPS Alarms</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="sysConfig" data-order="3">
<span class="navButton-color"><p>System Configuration</p></span>
<span class="glare"></span></li>
<li class="navButton" id="system" data-order="4">
<span class="navButton-color"><p>System</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="backBtn" data-order="100">
<span class="navButton-color"><p>BACK</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="rescan" data-order="101">
<span class="navButton-color"><p>ReScan</p></span>
<span class="glare"></span>
</li>
</ul>
在我的Navigation类中,我有一个可以调用的函数,它将按数据顺序中的值对无序列表的顺序进行排序:
public function setOrder() {
$liNodeList = $this->xpath->query("//ul[@id='primary-nav']//li");
$liNodes = iterator_to_array($liNodeList);
usort($liNodes, array('Navigation', 'sortListByOrderAttr'));
if ($liNodeList->length == count($liNodes)) {
for ($i = 0; $i < $liNodeList->length; $i++) {
$node = $liNodeList->item($i);
$newNode = $liNodes[$i];
$node->parentNode->replaceChild($newNode, $node);
}
}
else echo "error";
}
private static function sortListByOrderAttr($a, $b) {
return (int) $a->getAttribute('data-order') - (int) $b->getAttribute('data-order');
}
出于某种原因,我没有得到列表的正确顺序。相反,输出显示4个项目,而不是它应该显示的6个项目:
<ul id="primary-nav">
<li class="navButton" id="amps_off_button" data-order="6">
<span class="navButton-color red"><p>AMPS Off</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="amps_alarms" data-order="7">
<span class="navButton-color"><p>AMPS Alarms</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="backBtn" data-order="100">
<span class="navButton-color"><p>BACK</p></span>
<span class="glare"></span>
</li>
<li class="navButton" id="rescan" data-order="101">
<span class="navButton-color"><p>ReScan</p></span>
<span class="glare"></span>
</li>
</ul>
我怀疑我的问题是我的$node->parentNode->replaceChild($newNode, $node);
不是es bueno。也许我需要一种不同的方法来对此进行排序?帮助赞赏!
答案 0 :(得分:0)
好吧,在考虑了cHao所说的内容后,似乎在重新阅读了replaceChild
的工作原理后,它解释了为什么我的方法没有产生正确的结果,因为新的子节点已经存在于节点集。
我已经修改了代码:
public function setOrder() {
$liNodeList = $this->xpath->query("//ul[@id='primary-nav']//li");
$liNodes = iterator_to_array($liNodeList);
usort($liNodes, array('Navigation', 'sortListByOrderAttr'));
if ($liNodeList->length == count($liNodes)) {
for ($i = 0; $i < $liNodeList->length; $i++) {
$node = $liNodeList->item($i);
$newNode = $this->doc->importNode($liNodes[$i], TRUE);
$node->parentNode->appendChild($newNode);
}
}
else echo "error with nav menu";
}