CODEWITHSUNDEEP
phpxmlxpath
Colin M
Colin M

Reputation: 139

Retrieving an element with XPath based on child elements

I have an XML document in the following format:

<CONFIGURATION>
<ADMIN REFERRER="BCTRD" REQUIRE_AGREEMENTS="true" ALLOW_UPGRADES="true" />
<LAYOUT HIDE_PRESELECTED_SERVICES="true" AGREEMENTS_PER_EXCHANGE="true"></LAYOUT>
<SERVICE ID="TRE" CODE="TRADER_EMINI" OPTIONAL_BROKER="true">
    <EXCHANGE GROUP="FOO"/>
</SERVICE>
<SERVICE ID="TR" CODE="TRADER">
    <DEFAULT/>
    <EXCHANGE GROUP="BAR"/>
</SERVICE>
</CONFIGURATION>

I am currently using this code block to retrieve the service code of the default service:

$serviceList = $this->xpaths->query('config',"//SERVICE");
foreach ($serviceList as $service) {
    if ($service->getElementsByTagName('DEFAULT')->length) {
        $serviceCode = $service->attributes->getNamedItem('CODE')->nodeValue;
        break;
    }
}

I suspect that it's possible to do this with one or two lines of XPath, but I haven't been able to figure out how. How would you format an XPath query to retrieve the service code I'm after?

Upvotes: 0

Views: 48

Answers (2)

Marvin Smit
Marvin Smit

Reputation: 4108

You can get the 'CODE' attribute's value directly by using the following XPath statement

//SERVICE[DEFAULT]/@CODE

This basically is 'give me the attribute CODE from any SERVICE element that has DEFAULT child element.

Hope this helps.

Upvotes: 1

michi
michi

Reputation: 6625

Another xpath:

//SERVICE/DEFAULT/../@CODE

see it working: http://codepad.viper-7.com/CCzCn0

Upvotes: 1

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