for - Iterate

<for>

Iterate over collection

Introduce

Iterate over collection
you can use the Ognl expression of collection to get 
the properties and methods of variable value in context or session.

Attribute

value(required)
Get collection of variable, can also get the Ognl collection of the variable

valueScope(optional)
The scope of the variable

Property
context:Get variable from context(default)
session:Get variable from session

var(required)
Set the variable of each element

status(optional)
Set the variable of loop info

Symbol           describe
count     loop count
index     current loop index
isFirst   current loop is first
isLast    current loop is last

trim(optional)
Whether to retain the output value of the front and back blank characters

Property
false:yes(default)
true:no(Including the newline)

delimiter(optional)
delimiter of loop

test(optional)
Using Ognl to judgment the conditions, The result is true, then run the
current loop, The result is false, not run

Symbol
==:equal
!=:not equal
&&:and
||:or

duplicate(optional)
Whether the output of duplicate content

Property
true:duplicate content is still output(default)
false:duplicate content is no longer output

Example:

• demo/tag/tag.jmr.xml - common/for/for

For rule

Get the collection from value and set it to var, var is each element of iterate object.

Set a list and iterate over it.

Result

Tip: The iterate each element, the mouse is placed above, or selected, can show the value.

Set a Map, and each element has 2 attributes, key and value.

Result

Iterate each info status

Symbol         describe
count   size of collection
index   current index
isFirst current is first
isLast  current is last

Example:

Result

test usage

You can set test, enter the Ognl expression, if the expression returned is true, current loop execute, then returned is false. current loop not execute.

We initialize a List, which is put into 3 Book objects,
The Book object contains three fields, int:id, String:name, Double:price.

Set the action in the template to ForTagAction for the code prompt

Loop when price is greater than 50.

Result, loop only price elements greater than 50

Tip: The loop element can view its Ognl value.

trim usage

Trim is to judge whether to retain the output value of the front and back blank characters, the default false, that is to say, output all characters.

The following 2 output methods, one default trim="false", the other trim="true".

As you can see, the first method outputs as it is, 
including front and back spaces and newline characters, 
while the other removes spaces and newline characters.

delimiter usage

The separator between the loop output. If a delimiter is specified, the output elements are separated by separator.

Sets the parameter type and parameter name of the method, 
and the parameter is separated by ","

Result

duplicate usage

Sometimes the output may be the same. If you don't want to repeat the same output, you can set it: duplicate="false"，The same content is not repeated default is duplicate="true"。

There is no need to repeat output of import.

Result