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https://issues.apache.org/jira/browse/WW-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034208#comment-16034208
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Aleksandr Mashchenko commented on WW-1534:
------------------------------------------
The `uncheckedValue` in
[CheckboxInterceptor|https://github.com/apache/struts/blob/master/core/src/main/java/org/apache/struts2/interceptor/CheckboxInterceptor.java#L58]
can be used to set the default value. But I don't think it can be set to
{{null}} right now.
[~mars_pb] Another hack is to add just hidden fields :) -> [Single checkbox
generated with iterator not working while it is not
checked|https://stackoverflow.com/q/16460923/1700321]
> The value of checkbox getted in server-side is "false" when no any checkbox
> been selected.
> ------------------------------------------------------------------------------------------
>
> Key: WW-1534
> URL: https://issues.apache.org/jira/browse/WW-1534
> Project: Struts 2
> Issue Type: Improvement
> Components: Value Stack
> Affects Versions: 2.0.1
> Environment: tomcat-5.5.20 / jdk1.5.0.08
> Reporter: Ling Chang Ming
> Assignee: Lukasz Lenart
> Fix For: 2.5.next
>
>
> jsp section:
> {code:xml}
> <s:iterator value="%{#request.rolePs.items}" id="role" status="status">
> <tr >
> <td height="25" width="5%">
> <s:checkbox name="roleId" fieldValue="%{id}"
> theme="simple"/>
> </td>
> </tr>
> ........
> </s:iterator>
> {code}
> action section:
> {code:java}
> ....
> private String[] roleId;
> public String[] getRoleId() {
> return roleId;
> }
> public void setRoleId(String[] roleId) {
> this.roleId = roleId;
> }
> .....
> {code}
> the retrieved value of "roleId" is {{false}} when user doesn't select any
> checkbox elements. In my opinion, this case should returns null directly.
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