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Read more on how to create a user-defined namespace resolver, if you wish to take the latter approach. To match default elements in a non-null namespace, you either have to refer to a particular element using a form such as ['namespace-uri()='' and name()='p' and ( this approach works well for dynamic XPath's where the namespaces might not be known) or use prefixed name tests, and create a namespace resolver mapping the prefix to the namespace. There is no way in XPath to pick up the default namespace as applied to a regular element reference (e.g., for xmlns=''). Note: XPath defines QNames without a prefix to match only elements in the null namespace. documentElement ) Īnd then pass document.evaluate, the nsResolver variable as the namespaceResolver parameter. Var xpEvaluator = new XPathEvaluator ( ) var nsResolver = xpEvaluator. Specifying null will create a new XPathResult object. result: If an existing XPathResult object is specified, it will be reused to return the results.They are explained below in the section " Specifying the Return Type."

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There is a section in the appendix which contains a full list of the available constants. The most commonly passed constant is XPathResult.ANY_TYPE which will return the results of the XPath expression as the most natural type. resultType: A constant that specifies the desired result type to be returned as a result of the evaluation.See the Using a User Defined Namespace Resolver section in the appendix for details.

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Note that, if the xpathExpression contains a namespace prefix, this will result in a DOMException being thrown with the code NAMESPACE_ERR.

null, which can be used for HTML documents or when no namespace prefixes are used.

You should use this virtually all of the time.

Created by using the createNSResolver method of a XPathEvaluator object.

This enables conversion between the prefixes used in the XPath expressions and the possibly different prefixes used in the document.

namespaceResolver: A function that will be passed any namespace prefixes contained within xpathExpression which returns a string representing the namespace URI associated with that prefix.

The document node is the most commonly used.

contextNode: A node in the document against which the xpathExpression should be evaluated, including any and all of its child nodes.

xpathExpression: A string containing the XPath expression to be evaluated.

The evaluate function takes a total of five parameters: