freemarker macro null value

The null reference is by design an error in FreeMarker. Defining a custom n...

The null reference is by design an error in FreeMarker. Defining a custom null value - which is a string - is not a good idea for the reasons you.

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Here's what I did, which seems to work in most scenarios: The default ...

Here's what I did, which seems to work in most scenarios: The default value should be an empty string, and the null-check should be.

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Starting from freemarker , you can use this syntax: This example demonstrat...

Starting from freemarker , you can use this syntax: This example demonstrates how to handle null values for two lists in a Freemaker.

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Should work fine but it won't let me pass null into the macro, saying ...

Should work fine but it won't let me pass null into the macro, saying something is undefined blah bla. I know I could specify a default value like.

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The default value can even be another parameter, for example macro section ...

The default value can even be another parameter, for example macro section title label=title>. The parameter name uses the same syntax as like top-level.

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Why is FreeMarker so picky about null -s and missing variables, and what to...

Why is FreeMarker so picky about null -s and missing variables, and what to do with it? How to implement a function or macro in Java Language instead of in the non-existent variable or a null value (this two is the same for FreeMarker) as.

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The expression here must evaluate to a boolean value. For example in values...

The expression here must evaluate to a boolean value. For example in values. Simply, the template language doesn't know the concept of null.

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the name of the local variables store the parameter values (not expression)...

the name of the local variables store the parameter values (not expression), optionally which indicates the macro takes a variable number of parameters.

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value?api provides access to the API (usually, the Java API) of value, like...

value?api provides access to the API (usually, the Java API) of value, like value?api. . It is true if the variable exists (and isn't Java null) and is not "empty", . the "gate" hash to the namespace) associated with a macro or function variable.

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If an error occurs when evaluating the value of a parameter for a directive...

If an error occurs when evaluating the value of a parameter for a directive call, or if there are Handling missing/null variables: Template Author's Guide/The.

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Local variables: They can only be set inside a macro definition body or fun...

Local variables: They can only be set inside a macro definition body or function ${x} value of plain var. becomse visible --> macro test> 2.

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Example: Increments the numerical value stored in variable x: macro myMacro...

Example: Increments the numerical value stored in variable x: macro myMacro>foomacro> ${n} >.

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This will return the first parameter (here: "yes") if the boolean...

This will return the first parameter (here: "yes") if the boolean is true, otherwise the second parameter (here: "no"). Note that the return value is always a string;.

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A much more powerful way of reusing snippets is using macros, but that'...

A much more powerful way of reusing snippets is using macros, but that's an Note for programmers: A non-existent variable and a variable with null value is.

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This can be missing (null) if the template was created on-the-fly in Java (...

This can be missing (null) if the template was created on-the-fly in Java (via macros, it becomes rather confusing: the macro call won't change the value of.

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