java - DropdownChoice 选择与模型值不同，在 ajax 更新时更改

Question

我有一个 ListView ，该 ListView 内部是一个

EnumdropDrop - 文本字段 - DropdownChoice - Ajaxbutton |对于每个项目

第一个下拉列表是货币，第二个下拉列表是帐户对象，帐户下拉列表中的选择之一是创建一个新帐户，然后以货币命名。

创建新帐户时，应为帐户下拉列表中选择的值。

这对于第一个帐户效果很好，但第二个和所有后续新创建的帐户均已正确创建并添加到可能性列表中，但它们不是选定的帐户。每次我进行 ajax 刷新时，所有新创建的项目中选定的帐户都会设置为第一个创建的帐户。有趣的是，当我提交表单时，帐户选择是正确的。

package com.trifork.pengeplan.web.components.lists;

import com.trifork.pengeplan.domain.*;
import com.trifork.pengeplan.web.components.choice.EnumDropDownChoice;
import com.trifork.pengeplan.web.components.choice.OwnedAccountCreateNewDropDownChoice;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.ajax.markup.html.form.AjaxButton;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.PropertyListView;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.PropertyModel;
import org.apache.wicket.model.ResourceModel;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: tommysadiqhinrichsen
 * Date: 21/09/12
 * Time: 11.55
 */
public class MultipleCurrenciesListView extends PropertyListView<FinanceAccountCurrencyMapping> {

    IModel<OwnedAccount> ownedAccountIModel;

    public MultipleCurrenciesListView(String id, IModel model) {
        super(id, new PropertyModel<List<FinanceAccountCurrencyMapping>>(model, "financeAccountCurrencyMappings"));
        ownedAccountIModel = model;

    }

    @Override
    protected void populateItem(final ListItem<FinanceAccountCurrencyMapping> item) {

        EnumDropDownChoice<MoneyCurrency> moneyCurrency = new EnumDropDownChoice<MoneyCurrency>("moneyCurrency");
        moneyCurrency.add(new AjaxFormComponentUpdatingBehavior("onchange") {
            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                MoneyCurrency moneyCurrency = (MoneyCurrency) getFormComponent().getModelObject();
            }
        });
        item.add(moneyCurrency);

        item.add(new TextField("financeAccount.accountNumber"));

        final OwnedAccountCreateNewDropDownChoice accountForCash = new OwnedAccountCreateNewDropDownChoice("accountForCash", ownedAccountIModel.getObject().getLegalEntity().getOwnedBankAccounts());

        accountForCash.add(new AjaxFormComponentUpdatingBehavior("onchange") {
            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                OwnedAccount ownedAccount = (OwnedAccount) getFormComponent().getModelObject();
                if (ownedAccount != null && ownedAccount.getId() == -1) {

                    OwnedAccount newOwnedAccount = new OwnedAccount();
                    FinanceAccountCurrencyMapping financeAccountCurrencyMapping = item.getModelObject();
                    financeAccountCurrencyMapping.setAccountForCash(ownedAccount);

                    newOwnedAccount.setName(financeAccountCurrencyMapping.getOwnedAccount().getName() + " - " + financeAccountCurrencyMapping.getMoneyCurrency().name());
                    newOwnedAccount.setLegalEntity(financeAccountCurrencyMapping.getOwnedAccount().getLegalEntity());
                    newOwnedAccount.setAssetOrLiability(AssetOrLiability.ASSET);
                    newOwnedAccount.setAssetType(AssetType.BANK_ACCOUNT);
                    newOwnedAccount.setCurrency(financeAccountCurrencyMapping.getMoneyCurrency());
                    newOwnedAccount.getFinanceAccountCurrencyMappings().add(new FinanceAccountCurrencyMapping(newOwnedAccount));
                    ownedAccountIModel.getObject().getLegalEntity().getOwnedAccounts().add(ownedAccountIModel.getObject().getLegalEntity().getOwnedAccounts().size() - 1, newOwnedAccount);

                    accountForCash.setDefaultModelObject(newOwnedAccount);

                    target.add(getFormComponent().getForm().getPage());

                }


            }
        });
        item.add(accountForCash);


        item.add(new AjaxButton("deleteFinanceAccount", new ResourceModel("button.delete")) {
            @Override
            protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
                ownedAccountIModel.getObject().getFinanceAccountCurrencyMappings().remove(item.getModelObject());
                target.add(this.getForm());
            }

            @Override
            protected void onError(AjaxRequestTarget target, Form<?> form) {
                super.onError();
            }
        });
    }


}

有人能告诉我问题出在哪里吗？

已更新

package com.trifork.pengeplan.web.components.choice;

import com.trifork.pengeplan.domain.OwnedAccount;
import org.apache.wicket.markup.html.form.ChoiceRenderer;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.model.PropertyModel;
import org.apache.wicket.model.ResourceModel;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: tommysadiqhinrichsen
 * Date: 18/09/12
 * Time: 16.01
 * To change this template use File | Settings | File Templates.
 */
public class OwnedAccountCreateNewDropDownChoice extends DropDownChoice<OwnedAccount> {

    public OwnedAccountCreateNewDropDownChoice(String id) {
        super(id);
        List<OwnedAccount> choices = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();
    }

    public OwnedAccountCreateNewDropDownChoice(String id, IModel model) {
        super(id, model);
        List<OwnedAccount> choices = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();

    }

    public OwnedAccountCreateNewDropDownChoice(String id, List<OwnedAccount> choices) {
        super(id, choices);
        List<OwnedAccount> choices1 = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();
    }

    public OwnedAccountCreateNewDropDownChoice(String id, List<OwnedAccount> choices, ChoiceRenderer<OwnedAccount> renderer) {
        super(id, choices, renderer);
        List<OwnedAccount> choices2 = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();
    }

    public OwnedAccountCreateNewDropDownChoice(String id, Model<OwnedAccount> model, List<OwnedAccount> choices, ChoiceRenderer<OwnedAccount> renderer) {
        super(id, model, choices, renderer);
        List<OwnedAccount> choices3 = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();
    }

    public OwnedAccountCreateNewDropDownChoice(String id, PropertyModel<OwnedAccount> model, List<OwnedAccount> choices, ChoiceRenderer<OwnedAccount> renderer) {
        super(id, model, choices, renderer);
        List<OwnedAccount> choices4 = (List<OwnedAccount>) getChoices();
        choices.add(new OwnedAccount(-1, new ResourceModel("create.new").getObject()));
        setChoices(choices);
        init();
    }


    public void init() {

    }

    public void addChoice(OwnedAccount ownedAccount) {

        List<OwnedAccount> choices = (List<OwnedAccount>) getChoices();
        choices.add(choices.size() - 1, ownedAccount);
        setChoices(choices);
    }
}

Answer 1

如果不知道 OwnedAccountCreateNewDropDownChoice 做了什么，就很难发现问题。

但请检查这一行:

new OwnedAccountCreateNewDropDownChoice("accountForCash",
  ownedAccountIModel.getObject().getLegalEntity().getOwnedBankAccounts());

由于您稍后要修改银行帐户，因此此列表可能会过时。

遵循黄金 Wicket 规则，您永远不应该从模型中取出某些内容并将其放入另一个模型中:

new OwnedAccountCreateNewDropDownChoice("accountForCash",
  new PropertyModel(ownedAccountIModel, "legalEntity.ownedBankAccounts");

也许这可能有帮助。