How do you check if a tag is empty in XSLT?

How do you check if a tag is empty in XSLT?

Check if a string is null or empty in XSLT

1. Sample XML: item 1
2. A sample use case would look like:
3. Conclusion: To test if the value of a certain node is empty. It depends on what you mean by empty.

How do you check if a node is empty?

Use node. isNull() to check if a node is null (not present).

How do I find the value of a variable in XSLT?

The XSLT value-of> element is used to extract a value from an expression defined in the select attribute. The expression defined in the mandatory select attribute is either an XPATH expression (for nodes and/or values) or a variable reference. The return of the function is a literal value.

What is normalize space?

The normalize-space function strips leading and trailing white-space from a string, replaces sequences of whitespace characters by a single space, and returns the resulting string.

What is xsl copy of?

The XSLT element makes a deep copy of an XML node as defined by an expression in the select attribute. The function makes a deep copy of the identified node(s) – meaning that the selected nodes are copied; including all the node’s children/descendants, attributes, and namespaces.

How to check if string is null or empty in XSLT?

While the accepted answer works for this, it also returns the same result when the string is blank or empty, i.e. ”, so you can’t differentiate. So you can simply test the attribute. Sometimes it’s necessary to know the exact state and you can’t simply check if CategoryName is instantiated, because unlike say Javascript

When to use XSI nil to check string length?

There is xsi:nil, but that is rarely used, especially rarely in untyped scenarios without a schema of some sort. If there is a possibility that the element does not exist in the XML I would test both that the element is present and that the string-length is greater than zero:

Is there such a thing as null in XML?

Programming without if-branches. Note: there is no such thing as null in XML. There is xsi:nil, but that is rarely used, especially rarely in untyped scenarios without a schema of some sort.

Which is an example of an idiom in XSLT?

A typical programming idiom in XSLT is using templates (hence the T in XSLT), which is declarative programming, not imperative (you don’t tell the processor what to do, you just tell what you want output if certain conditions are met). For this use-case, that can look something like the following: