Struts 2 multiple select and pre selecting

In this Tutorial, I will show you how to use  s:select multiple select option and also how to use multiple pre-selecting.

Using Java list:
Suppose you have a jsp page as input screen and having s:select with multiple-select option. Here is the code:

<s:select 
 name="exType"
 multiple="true"
 list="exTypeList"
 listKey="exTypeId" 
 listValue="exTypeName"/>

Now in output screen (jsp page) we will get selected items using value attribute of s:select tag. Here is the code:

<s:select name="exType" 
 multiple="true" 
 value="exTypeValues" 
 list="exTypeList"
 listKey="exTypeId"
 listValue="exTypeName"/>

Action class code for setting value attribute's values (pre-selecting values).

public class ShowAllExercisesData extends ActionSupport {

private List<Integer> exTypeValues;

  public List<Integer> getExTypeValues() {
return Arrays.asList(2, 4);
   }

  public void setExTypeValues(List<Integer> exTypeValues) {
        this.exTypeValues = exTypeValues;
   }
}

So in output jsp 2 and 4 keys values will be  pre-selected.

Description of attribute s:select multiple :
Creates a multiple select. The tag will pre-select multiple values if the values are passed as an Array or a Collection(of appropriate types) via the value attribute. If one of the keys equals one of the values in the
Collection or Array that will be selected.

Using OGNL list:

<s:select 
   name="exType"
   multiple="true"
   size="8" 
   list="#{1:'Cardio', 2:'Strength', 3:'Stretches', 4:'CrossFit', 5:'Others'}" 
   value="%{{2, 4}}"
/>

 OR

<s:select 
   name="exType"
   multiple="true"
   size="8" 
   list="#{1:'Cardio', 2:'Strength', 3:'Stretches', 4:'CrossFit', 5:'Others'}" 
   value="exTypeValues"
/>

Set pre-selected values in Action class like this:

public List<Integer> getExTypeValues() {
return Arrays.asList(2, 4);
   }

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