使用jQuery根据XML的<y>标签值查找指定<field>的<value>值

Got it, so you need to pull the <value> of the <field> where <name> is "work", but only from the <x> node that has a specific <y> value. Let's break down two easy-to-implement solutions:

1. Use XPath (Quickest for One-Off Queries) #

XPath is perfect for targeted XML searches. For your structure, here's the expression you'll need:

If you're looking for the <x> node where <y> is 12, use this:

//x[y="12"]/metadata/field[name="work"]/value/text()

Let's break that down:

• //x[y="12"]: Grabs all <x> nodes where the child <y> has the text "12"
• /metadata/field[name="work"]: Drills into the <metadata> of that <x> node, then picks the <field> where <name> is "work"
• /value/text(): Pulls the actual text content from the <value> tag of that field

If you're using a command-line tool like xmllint, run this to get the result directly:

xmllint --xpath '//x[y="12"]/metadata/field[name="work"]/value/text()' your_xml_file.xml

For your sample XML, this would spit out true.

2. Python Code (For Programmatic Use) #

If you need to do this in a script, Python's built-in xml.etree.ElementTree module works great. Here's a complete example:

import xml.etree.ElementTree as ET

# Parse your XML file (use ET.fromstring() if working with an XML string instead)
tree = ET.parse("your_file.xml")
root = tree.getroot()

# Set the target <y> value you want to match
target_y = "12"

# Loop through all <x> nodes to find the matching one
for x_node in root.findall("x"):
    y_tag = x_node.find("y")
    if y_tag is not None and y_tag.text == target_y:
        # Now find the "work" field in this <x>'s metadata
        metadata = x_node.find("metadata")
        for field in metadata.findall("field"):
            name_tag = field.find("name")
            if name_tag is not None and name_tag.text == "work":
                value_tag = field.find("value")
                if value_tag is not None:
                    print(f"Found the value: {value_tag.text}")
                break
        break

Run this, and it'll output Found the value: true for your sample. Just change target_y to "14" to match the other <x> node once your XML is complete.

Quick Notes #

• Make sure your XML is well-formed: Your sample cuts off the second <x> node—double-check all tags are closed and there's a root element wrapping everything.
• Case sensitivity: XML (and XPath) are case-sensitive, so make sure "work", "y", etc., match exactly what's in your file.

内容的提问来源于stack exchange，提问作者Ancy