Question

我做了一个实验。首先，我想说明html：

<form wicket:id="form">
<table>
    <tr>
        <td>
            <table style="border: 1px solid;" cellspacing="0" cellpadding="0">
                <tr wicket:id="row">
                    <td wicket:id="column" style="border: 1px solid #3A6395">
                        <div wicket:id="div">
                            <span wicket:id="panel"></span>
                            <span wicket:id="tooltip"><span wicket:id="tooltipPanel"></span></span>
                        </div>
                    </td>
                </tr>
            </table>
        </td>
        <td>
            &nbsp;
        </td>
    </tr>
</table>
</form>
<wicket:fragment wicket:id="labelFragment">
    <span wicket:id="value"></span>
</wicket:fragment>
<wicket:fragment wicket:id="linkFragment">
    <a href="" wicket:id="link">
        <span wicket:id="value"></span>
    </a>
</wicket:fragment>

java：

private class ReportDisplayByUserWithTaskTypeSortForm extends Form {

        private static final long serialVersionUID = 10162L;

        public ReportDisplayByUserWithTaskTypeSortForm(String id) {
            super(id);
            setOutputMarkupId(true);
            addComponent();
        }

        private void addComponent() {           
            ListView row = new ListView("row", new LoadableDetachableModel() {

                private static final long serialVersionUID = 10164L;

                @Override
                protected Object load() {
                    return getUserMonitorMap();
                }
            }) {

                private static final long serialVersionUID = 10165L;

                @Override
                protected void populateItem(ListItem rowItem) {
                    @SuppressWarnings("unchecked")
                    List<? extends Element> columnMap = (List<Element>) rowItem.getModelObject();
                    ListView column = new ListView("column", columnMap) {

                        private static final long serialVersionUID = 10166L;

                        @Override
                        protected void populateItem(ListItem columnItem) {
                            Element element = (Element) columnItem.getModelObject();

                            WebMarkupContainer div = new WebMarkupContainer("div");
                            Label value = new Label("value");
                            Fragment fragment = null;

                            if (element instanceof TaskTypeLabelElement) {
                                fragment = new Fragment("panel", "linkFragment", this);

                                AjaxLink link = new AjaxLink("link") {

                                    private static final long serialVersionUID = 10163L;

                                    @Override
                                    public void onClick(AjaxRequestTarget target) {
                                        sortAsc = !sortAsc;
                                        doSort();                                       
                                        target.addComponent(this.getParent().getParent().getParent().getParent().getParent().getParent().getParent());                                      
                                    }
                                };
                                link.add(value);
                                fragment.add(link);
                            } else {
                                fragment = new Fragment("panel", "labelFragment", this);
                                fragment.add(value);
                            }

                            // some other code goes here

                            columnItem.add(div);
                        }
                    };
                    rowItem.add(column);
                }
            };

            add(row);
        }
    }
}

片段中的链接实例化为：

AjaxLink link = new AjaxLink("link") {

        private static final long serialVersionUID = 10163L;

        @Override
        public void onClick(AjaxRequestTarget target) {
            System.out.println(this);
            System.out.println(this.getParent());
            System.out.println(this.getParent().getParent());
            System.out.println(this.getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent().getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent().getParent().getParent().getParent().getParent());
            System.out.println(this.getParent().getParent().getParent().getParent().getParent().getParent().getParent().getParent().getParent());
        }
    };

System.out.println的输出：

15:58:17,476 INFO  [STDOUT] [MarkupContainer [Component id = link]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = panel]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = div]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = 0]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = column]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = 0]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = row]]
15:58:17,477 INFO  [STDOUT] [MarkupContainer [Component id = form]]
15:58:17,477 INFO  [STDOUT] [Page class = info.release.wicket.ReportDisplayByUserWithTaskTypeSort, id = 4, version = 0]
15:58:17,477 INFO  [STDOUT] null

我的问题是：

“Component id = div”和“Component id = column”之后“Component id = 0”的含义是什么？这个组件是什么？
第二行的“id = 4，version = 0”是什么意思？

Answer 1

ID为0的组件是ListItem，其ID是包含ListView的索引。

每个会话为每个页面分配一个ID（“id = 4”），请参阅API documention of Page中的“身份”段落。

每个页面的版本都可以支持后退按钮（“version = 0”），请参阅API documention of Page中的“后退按钮”段落。如果启用，则会话中存储每页多个版本。新版本通常由表单提交触发。您可以使用forminput example进行尝试，使用不同的值多次提交表单，查看URL（您可以看到增加的版本）并尝试浏览器的后退按钮。

Wicket组件层次结构 - getParent（）

1 个答案: