Question about how freemarker gets the list Length

Source: Internet
Author: User

 

Get the list length: $ {fields? Size }.

 

When judging its length,

 

<# If fields? Size> 0>

</# If>

 

An error was thrown, not a boolean type,

 

Java backtrace for programmers:

----------

Freemarker. Core. nonbooleanexception: Error on line 132, column 22 in viewentity_js.ftl

Expecting a Boolean (true/false) expression here

Expression fields? Size does not evaluate to true/false

It is an instance of freemarker. template. simplenumber

At freemarker. Core. expression. istrue (expression. Java: 150)

 

Dizzy, tried a few times, it was okay to add a scratch.

 

<# If (Fields? Size> 0)>

</# If>

 

 

 

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