“for” loop in velocity template
Try to do it like this: #set($start = 0) #set($end = 4) #set($range = [$start..$end]) #foreach($i in $range) doSomething #end The code has not been tested, but it should work like this.
velocity
How to access/get the size of an array/collection in velocity templates?
I’ve never used Velocity, but its VTL reference guide says that calling a method is done using $customer.getAddress() or ${purchase.getTotal()}. So I would use ${myArrayList.size()}.
How to do an inline if/otherwise (aka ternary operator) in Velocity?
You can do #set($value = “#if($flag)red#{else}blue#end”)
Replace a Substring of a String in Velocity Template Language
By default you can use the methods of the Java String object: #set( $a = “Hello” ) #set( $b = $a.replace(“l”, “+”) ) ${b} will produce He++o and you can also use velocity variables as arguments to your method calls, e.g.: #set( $a = “Hello” ) #set( $b = “+” ) #set( $c = $a.replace(“l”, … Read more
How I hide empty Velocity variable names?
You can mark variables as “silent” like this: $!variable If $variable is null, nothing will be rendered. If it is not null, its value will render as it normally would.
How to convert string into integer in the Velocity template?
Aha! Been there. #set($intString = “9”) #set($Integer = 0) $Integer.parseInt($intString) Doing this uses the java underlying velocity. The $Integer variable is nothing more that a java Integer object which you can then use to access .parseInt Edit: The above code is for demonstration. Of course there are ways to optimize it.
Loading velocity template inside a jar file
If you want to use resources from classpath, you should use resource loader for classpath: ve.setProperty(RuntimeConstants.RESOURCE_LOADER, “classpath”); ve.setProperty(“classpath.resource.loader.class”, ClasspathResourceLoader.class.getName()); ve.init();
in velocity can you iterate through a java hashmap’s entry set()?
Your mistake is referring to key and value as methods (with trailing “()” parenthesis) instead of as properties. Try this: #set ($map = $myobject.getMap() ) #foreach ($mapEntry in $map.entrySet()) <name>$mapEntry.key</name> <value>$mapEntry.value</value> #end In other words, use either a property, like mapEntry.key, or the method, like mapEntry.getKey().
$null check in velocity
To check if a variable is not null simply use #if ($variable) #if ($variable) … do stuff here if the variable is not null #end If you need to do stuff if the variable is null simply negate the test #if (!$variable) … do stuff here if the variable is null #end
How to escape a # in velocity
this: #[[ ## ]]# will yield: ## anything within #[[ … ]]# is unparsed.