Path: How to check if an attribute is empty? : SystemWeaver

创建新话题

已回答

Path: How to check if an attribute is empty?

SystemWeaver

创建话题约7年以前

I want to filter a set of Items whether an attribute is empty or not. I Have tried using matches:

@ATTR.Matches('^$') that is supposed to identify empty strings(?). I want to do this both for an enumeration attribute and a string attribute.

How can I do this?

最佳答案

Jan Söderberg 说约7年以前

Does not this simple solution work?
[@ATTR='']

8 Comments

Jan Söderberg

说约7年以前

回答

Does not this simple solution work?
[@ATTR='']

SystemWeaver

说约7年以前

It does. I thought I tried that yesterday without success. Thanks!

Bashar Nassar

说约7年以前

I think this will not work for example:
/part::ARPP[@AREP='']
ERROR: No '=' operator on (Boolean, String) could be found

But if you add ".ToString" it will work
/part::ARPP[@AREP.ToString='']

Magnus W

说约7年以前

It depends on the type of the attribute.

In your case Bashar you have a boolean attribute: AREP, while Fredrik possibly had a string attribute.

Liquid error: translation data {:other=>"%{count} 人 "} can not be used with :count => 1. key 'one' is missing.

Bashar Nassar

说约7年以前

Thanks Magnus!

Inactive VCC contacts

说将近7年以前

Hello, I have similar question here: is there any way I can check if <List> object is empty?

Bashar Nassar

说将近7年以前

Hi Jakub,

You can use .Count which counts the number of object in a list.

Example:

........

</If>

Best regards,

Bashar

Jan Söderberg

说将近7年以前

There is a rather elegant, but possibly a bit abstract, example in the Help manual, on the "[ ] Operator":

/IRRS[/ISSE=[]]

Returns all report sections without any subsection.

登录发表评论

今天我们能为您做些什么？