Multi select Drop down in Struts2

Question

<div class="select_wrap">
    <select name="sampleselect"  class="select_field" multiple="multiple" >

        <option>Select Id  </option>
        <s:iterator value="userList" var="usrList" status="s">
        <option value=<s:property value="#usrList"></s:property>><s:property value="#usrList"></s:property></option>

        </s:iterator>
    </select>
    </div>      
<br /><br />
            <s:submit value="Compliance Export" name="Export Data" align="left" action="exportExcelAction4"/>

usrList is populated from the database

In my action class

private List<String> sampleselect=new ArrayList<String>();

    public List<String> getSampleselect() {
        return sampleselect;
    }


    public void setSampleselect(List<String> sampleselect) {
        this.sampleselect = sampleselect;
    }

But this selection selection is not populated.

Answer 1

The attribute is listused to get the iterative source, while the attribute is nameused to set the selected item. Also use a tag <s:select/>for cleaner (and much simpler) code. For example:

Struts.xml

<action name="firstAction" class="foo.bar.FirstAction">
    <result>firstPage.jsp</result>
</action>

<action name="secondAction" class="foo.bar.SecondAction">
    <result>secondPage.jsp</result>
</action>

FirstAction.java

private List<String> userList;

/* Getter and Setter */

public String execute(){
    // Load your data from database
    userList = getMyService().findUserList();
    return SUCCESS;
}

FirstPage.jsp

<s:form action="secondAction" >
    <div class="select_wrap">
        <s:select list = "userList"
                  name = "selectedItem"
              cssClass = "select_field"
              multiple = "multiple" />
    </div>

    <s:submit value="Post your selection to second Action" />
</s:form>

SecondAction.java

private String selectedItem;

/* Getter and Setter */ 

public String execute(){
    log.debug("Selected item is: " + selectedItem);
    return SUCCESS;
}

SecondPage.jsp

<div>
    Selected item is: <s:property value="selectedItem" />
</div>

Answer 2

Use the Struts2 tag <s:select>, not an iterator over the elements. In addition, your sampleelect variable is initialized, but it has no elements.

:

private List<String> sampleselect = Arrays.asList("some", "data", "items");

JSP :

<s:select list="sampleselect" multiple="true"/>

: http://struts.apache.org/release/2.3.x/docs/select.html