多选下拉菜单在Struts 2中突出显示

Question

Jsp-

<s:form action="product">

<s:select label="Select Data"
    cssStyle="width:150; height:73"
    size="6"
    multiple="true"
    headerKey="-1" headerValue="All"
    list="#{'1':'Data1', '2':'Data2', '3':'Data3', '4':'Data4' }"
    name="dataValue"
    value="%{2,3}" />
<s:submit value="save"></s:submit>
</s:form>

Action :

public class Product {
private String dataValue;
//getter setter
.......
public String execute(){  
                return "success";  
    }

}

Problem : at a time one field is selected only for example i passed value 2,3 then only Data3 is selected but i wants Data2 and Data3 selected

Answer 1

To pre-select multiple values you need to use list or array for the action property in the value attribute.

'1', '2',... are character type values, so you return a character list

public List<Character> getDataValue(){
  return dataValue;
}

<s:select label="Select Data"
    cssStyle="width:150; height:73"
    size="6"
    multiple="true"
    headerKey="-1" headerValue="All"
    list="#{'1':'Data1', '2':'Data2', '3':'Data3', '4':'Data4' }"
    name="dataValue"
    value="%{dataValue}" />