Handling null values in Freemarker

Question

How to handle null values in Freemarker  I get some exceptions in the template when null values are present in data

User · Accepted Answer

You can use the    test operator  This checks if the attribute of the object is not null   lt  if object attribute   gt  lt   if gt   This checks if object or attribute is not null   lt  if  object attribute    gt  lt   if gt   Source  FreeMarker Manual

User · Answer

I think it works the other way   lt  if object attribute   gt     Do whatever you want      lt   if gt    If object attribute is NOT NULL  then the content will be printed

User · Answer

Use    operator at the end of your  lt  if gt  statement   This example demonstrates how to handle null values for two lists in a Freemaker template   List of cars   lt  if cars   gt       lt  list cars as car gt   car owner   lt   list gt   lt   if gt  List of motocycles   lt  if motocycles   gt       lt  list motocycles as motocycle gt   motocycle owner   lt   list gt   lt   if gt

User · Answer

Starting from freemarker 2 3 7  you can use this syntax       object attribute      or  if you want display a default text when the attribute is null       object attribute   default text

User · Answer

If you have a lot of variables to convert in optional  you can use SubimeText with this   Find       A-Za-z 0-9     Replace        1       Be sure regex and case-sensitive options are enabled

[freemarker] Handling null values in Freemarker

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