我在index.xhtml上有一个数据库
<h:dataTable style="border: solid 2px black;"
value="#{IndexBean.bookList}" var="item"
binding="#{IndexBean.datatableBooks}">
<h:column>
<h:commandButton value="Edit" actionListener="#{IndexBean.editBook}">
<f:param name="index" value="#{IndexBean.datatableBooks.rowIndex}"/>
</h:commandButton>
</h:column>
</h:dataTable>
我的豆
@ManagedBean(name="IndexBean")
@ViewScoped
public class IndexBean implements Serializable {
private HtmlDataTable datatableBooks;
public HtmlDataTable getDatatableBooks() {
return datatableBooks;
}
public void setDatatableBooks(HtmlDataTable datatableBooks) {
this.datatableBooks = datatableBooks;
}
public void editBook() throws IOException{
int index = Integer.parseInt(FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("index").toString());
System.out.println(index);
}
}
我的问题是,即使我点击不同的编辑按钮,我总是在服务器日志中获得相同的索引.假设有一个集合被提供给datatable.我没有在豆中显示.
如果我将范围从ViewScope更改为RequestScope,它可以正常工作. @ViewScoped有什么问题？提前致谢 ：)
编辑：
<h:column>
<h:commandButton value="Edit" actionListener="#{IndexBean.editBook}" />
</h:column>
public void editBook(ActionEvent ev) throws IOException{
if (ev.getSource() != null && ev.getSource() instanceof HtmlDataTable) {
HtmlDataTable objHtmlDataTable = (HtmlDataTable) ev.getSource();
System.out.println(objHtmlDataTable.getRowIndex());
}
}
解决方法
您已经绑定了< h：dataTable>组件到bean.所有你需要做的是：
public void editBook() throws IOException{
int index = datatableBooks.getRowIndex(); // Actually not interesting info.
Book book = (Book) datatableBooks.getRowData(); // This is what you want.
}
< f：param>这里也不需要.更多提示也见this article.
更新：我可以重现你的问题.这可能是@ViewScoped的错误.当bean设置为@RequestScoped时,它的工作原理如预期.此外,当您删除组件绑定并从viewroot自己获取组件时,它的工作原理.我已经提交了issue 1658这个.
