XML DOM createExpression() method
Definition and usage
The createExpression() method creates an XPath expression for later calculation.
Syntax:
createExpression(xpathText,namespaceURLMapper)
| Parameter | Description |
|---|---|
| xpathText | A string representing the XPath expression to be compiled. |
| namespaceURLMapper | a function that maps a namespace prefix to a full namespace URL. If such a mapping is not needed, it is null. |
return value
throw
If xpathText Contains a syntax error, or it uses namespaceURLMapper A namespace prefix that cannot be resolved, this method will throw an exception.
Description
This method accepts a string representing an XPath expression and converts it into a compiled expression, that is, an XPathExpression. In addition to this expression, this method also accepts a function in the form of function(prefix), which parses a namespace prefix string and returns a full namespace URL string.
IE does not support this API. See Node.selectNodes() Learn a specific alternative method for IE.
