XPath to return string concatenation of qualifying child node values

问题

Can anyone please suggest an XPath expression format that returns a string value containing the concatenated values of certain qualifying child nodes of an element, but ignoring others:

<div>
    This text node should be returned.
    <em>And the value of this element.</em>
    And this.
    <p>But this paragraph element should be ignored.</p>
</div>

The returned value should be a single string:

This text node should be returned. And the value of this element. And this.

Is this possible in a single XPath expression?

Thanks.

回答1:

In XPath 1.0:

You can use

/div//text()[not(parent::p)]

to capture the wanted text nodes. The concatenation itself cannot be done in XPath 1.0, I recommend doing it in the host application.

回答2:

In XPath 2.0 :

string-join(/*/node()[not(self::p)], '')

回答3:

/div//text()

double slash forces to extract text regardless of intermediate nodes

回答4:

This look that works:

Using as context /div/:

text() | em/text()

Or without the use of context:

/div/text() | /div/em/text()

If you want to concat the first two strings, use this:

concat(/div/text(), /div/em/text())

回答5:

If you want all children except p, you can try the following...

    string-join(//*[name() != 'p']/text(), "")

which returns...

This text node should be returned.
And the value of this element.
And this.

回答6:

You could use a for-each loop as well and assemble the values in a variable like this

<xsl:variable name="newstring">
    <xsl:for-each select="/div//text()">
      <xsl:value-of select="."/>
    </xsl:for-each>
  </xsl:variable>

来源：https://stackoverflow.com/questions/1403971/xpath-to-return-string-concatenation-of-qualifying-child-node-values

标签

xpath

string-concatenation