douzui0143 2012-12-23 17:59
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xpath找出其他兄弟姐妹中的子号码

I've had several other question related to the subject:

getting a parent node and its child, where the child has a certain text

and XPath finding certain node with certain text

Lets say this is my HTML:

<body>
    <div>
          <span>something else</span>
          <span>something</span>
          <span>something else</span>
    <div>
</body>

I am using the following to query for a node with certain text:

$node_with_value = $xpath->query('(//*[text()= "'something"])');

this returns the list with all node that has something. In this case it will be only 1.

to find its parent i do: parent = $node_with_value->item(0)->parentNode;

Now my question is how can i check what number of child it is.

in the above we have 3 span children to the div, counting from top to bottom its number 2. is there a way to count that programmaticaly?

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  • duanmei1930 2012-12-23 18:31
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    With XPath you can do $count = $xpath->evaluate("count(. | preceding-sibling::*)", $node-with-value->item(0)) to find the number in terms of sibling elements or $count = $xpath->evaluate("count(. | preceding-sibling::node())", $node-with-value->item(0)) to find the number in terms of sibling nodes (i.e. element nodes but text, comment and processing instruction nodes as well).

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