On Timer事件我想使組件再次可見。有沒有什麼不同的方法來完成這項任務?我附上snipet belove。如何在類Timer中的可見HTML標記組件中使用
HTML標記:在這個文件我創建的提醒條
<div Class="row" wicket:id="alert_app" >
<div class="alert alert-info" role="alert" style="top: 2%; left: 50%; position: absolute;">
<a href="#" wicket:id="alert" style="color:red" >Alert - Match Found</a>
</div>
</div>
的Java類:我有實例化WebMarkupContainer,使無形的初始階段,出現的將5秒內提醒欄後(這是我的計劃)因爲我使用計時器,我卡在計時器事件。
WebMarkupContainer informationBox = new WebMarkupContainer("alert_app");
add(informationBox);
final AjaxLink saveProfile = new AjaxLink("alert") {
private static final long serialVersionUID = 1L;
public void onClick(AjaxRequestTarget target) {
this.setResponsePage(ABC.class);
}
};
informationBox.add(saveProfile);
informationBox.setVisible(false);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
informationBox.setVisibilityAllowed(true);
informationBox.setVisible(true); // I got error in this line
}
}, 5000);
錯誤:
12:37:04,735 INFO
[org.apache.wicket.response.filter.AjaxServerAndClientTimeFilter] (http-
localhost-127.0.0.1-8080-4) 1ms server time taken for request
wicket/bookmarkable/xyz.abc.vbn.class?
4&username=user+name response size: 9386
12:37:09,736 ERROR [stderr] (Timer-3) Exception in thread "Timer-3"
org.apache.wicket.WicketRuntimeException: No RequestCycle is currently set!
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.Component.getRequest(Component.java:1791)
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.markup.html.WebPage.dirty(WebPage.java:334)
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.Page.dirty(Page.java:248)
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.Page.componentStateChanging(Page.java:937)
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.Component.addStateChange(Component.java:3512)
12:37:09,736 ERROR [stderr] (Timer-3) at
org.apache.wicket.Component.setVisible(Component.java:3195)
12:37:09,736 ERROR [stderr] (Timer-3) at
java.util.TimerThread.mainLoop(Timer.java:555)
12:37:09,736 ERROR [stderr] (Timer-3) at
java.util.TimerThread.run(Timer.java:505)