Jsf 启用选择时,必须实现数据模型。?
我想在勾选复选框并按下删除按钮时从数据表中删除行 这是datatable代码段:Jsf 启用选择时,必须实现数据模型。?,jsf,primefaces,Jsf,Primefaces,我想在勾选复选框并按下删除按钮时从数据表中删除行 这是datatable代码段: <p:dataTable id="cartTable" lazy="true" scrollable="true" scrollHeight="115" selection="#{Cart_Check.selectedItems}" value="#{Cart_Check.cart}" var="cart" rowKey="#{cart.sheetno}"
<p:dataTable id="cartTable" lazy="true" scrollable="true"
scrollHeight="115" selection="#{Cart_Check.selectedItems}"
value="#{Cart_Check.cart}" var="cart" rowKey="#{cart.sheetno}"
style="widht:100%;margin-top:10%;margin-left:1%;margin-right:30px ;box-shadow: 10px 10px 25px #888888;">
<f:facet name="header">
Checkbox Based Selection
</f:facet>
<p:column selectionMode="multiple" style="width:2%">
</p:column>
//Here the columns are metion
<f:facet name="footer">
<p:commandButton id="viewButton" value="Remove" />
</f:facet>
</p:dataTable>
基于复选框的选择
//这里的列是metion
这是支持bean
public class checkcart {
private int items;
private ArrayList<User_Cart> cart;
private ArrayList<User_Cart> selectedItems;
public checkcart() {
getvalues();
}
//getter and setter
public void getvalues() {
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) context.getExternalContext()
.getSession(false);
System.out.println("Cart Request ::::" + session.getAttribute("regid"));
try {
Connection connection = BO_Connector.getConnection();
String sql = "Select * from cart_orderinfo where usrregno=?";
PreparedStatement ps = connection.prepareStatement(sql);
ps.setString(1, (String) session.getAttribute("regid"));
ResultSet rs = ps.executeQuery();
cart = new ArrayList<>();
while (rs.next()) {
User_Cart user_cart = new User_Cart();
user_cart.setSheetno(rs.getString("sheetno"));
user_cart.setState_cd(rs.getString("state_cd"));
user_cart.setDist_cd(rs.getString("dist_cd"));
user_cart.setLicensetype(rs.getString("license_type"));
user_cart.setFormat(rs.getString("sheet_format"));
user_cart.setQuantity(rs.getInt("quantity"));
cart.add(user_cart);
}
} catch (Exception ex) {
System.out.println(ex);
}
}
}
公共类checkcart{
私人物品;
私人ArrayList购物车;
私有数组列表selectedItems;
公共checkcart(){
getvalues();
}
//接二连三
public void getvalues(){
FacesContext context=FacesContext.getCurrentInstance();
HttpSession会话=(HttpSession)上下文。getExternalContext()
.getSession(false);
System.out.println(“购物车请求:”+session.getAttribute(“regid”);
试一试{
Connection Connection=BO_Connector.getConnection();
String sql=“从购物车\订单信息中选择*,其中usrregno=?”;
PreparedStatement ps=connection.prepareStatement(sql);
ps.setString(1,(String)session.getAttribute(“regid”);
结果集rs=ps.executeQuery();
cart=newarraylist();
while(rs.next()){
用户购物车用户购物车=新用户购物车();
用户_cart.setSheetno(rs.getString(“sheetno”);
user_cart.setState_cd(rs.getString(“state_cd”);
user_cart.setDist_cd(rs.getString(“dist_cd”);
user_cart.setLicensetype(rs.getString(“许可证类型”);
user_cart.setFormat(rs.getString(“sheet_格式”);
用户设置数量(rs.getInt(“数量”);
cart.add(用户\购物车);
}
}捕获(例外情况除外){
系统输出打印项次(ex);
}
}
}
当我运行这个页面时,我得到以下错误
启用选择时,数据模型必须实现org.primefaces.model.selectabledatamodel。
但是,当我删除复选框时,它们没有错误,但没有复选框
如何做以及如何解决以下错误..请帮助
我想要这样的东西:
您只需要定义ListDataModel,如下所示
public class SD_User_Cart extends ListDataModel<User_Cart> implements SelectableDataModel<User_Cart> {
public SD_User_Cart() {
}
public SD_User_Cart(List<User_Cart> data) {
super(data);
}
@Override
public User_Cart getRowData(String rowKey) {
//In a real app, a more efficient way like a query by rowKey should be implemented to deal with huge data
List<User_Cart> rows = (List<User_Cart>) getWrappedData();
for (User_Cart row : rows) {
if (row.getCartId.toString().equals(rowKey)) {//CartId is the primary key of your User_Cart
return row;
}
}
return null;
}
@Override
public Object getRowKey(User_Cart row) {
return row.get.getCartId();
}
}
private SD_User_Cart cart;
<p:column selectionMode="multiple" style="width:18px"/>
然后在p:datatable中定义选择,并添加一列,如下所示
public class SD_User_Cart extends ListDataModel<User_Cart> implements SelectableDataModel<User_Cart> {
public SD_User_Cart() {
}
public SD_User_Cart(List<User_Cart> data) {
super(data);
}
@Override
public User_Cart getRowData(String rowKey) {
//In a real app, a more efficient way like a query by rowKey should be implemented to deal with huge data
List<User_Cart> rows = (List<User_Cart>) getWrappedData();
for (User_Cart row : rows) {
if (row.getCartId.toString().equals(rowKey)) {//CartId is the primary key of your User_Cart
return row;
}
}
return null;
}
@Override
public Object getRowKey(User_Cart row) {
return row.get.getCartId();
}
}
private SD_User_Cart cart;
<p:column selectionMode="multiple" style="width:18px"/>
希望这有帮助:)您需要定义一个您的
私有数组列表selectedItems代码>后台类中的数据成员公共类checkcart
像这样私有用户\u Cart[]selectedItems
并给出setter和getter方法,以使其能够工作。
我也面临同样的问题