在 wicket 中使用 AutoCompleteTextField 而不使用 String 作为通用类型
这个问题如下：handling to onchange event of AutoCompleteTextField in wicket
我正在尝试将 AutoCompleteTextField 与自定义类一起用作通用类型，并添加 AjaxFormComponentUpdatingBehavior。我的意思是我想要一个
AutoCompleteTextField<SomeClass> myAutoComplete = ...;
，然后添加一个 AjaxFormComponentUpdatingBehavior：
myAutoComplete.add(new AjaxFormComponentUpdatingBehavior("onchange") {
@Override
protected void onUpdate(AjaxRequestTarget target) {
System.out.println( "Value: "+getValue() );
}
});
问题是，出于某种原因，添加该行为会使表单尝试使用 String 设置模型对象（即使 AutoCompleteTextField 具有 SomeClass 的通用类型） )，当 onchange 事件触发时引发 ClassCastException。
有没有办法使用 AutoCompleteTextField 而不是 AutoCompleteTextField？我找不到任何例子。感谢您抽出时间！
并感谢用户 biziclop 在此事上的帮助。
This question follows this: handling to onchange event of AutoCompleteTextField in wicket
I'm trying to use the AutoCompleteTextField with a custom class as the generic type, and to add an AjaxFormComponentUpdatingBehavior. What I mean is I want to have a
AutoCompleteTextField<SomeClass> myAutoComplete = ...;
and after that add a AjaxFormComponentUpdatingBehavior:
myAutoComplete.add(new AjaxFormComponentUpdatingBehavior("onchange") {
@Override
protected void onUpdate(AjaxRequestTarget target) {
System.out.println( "Value: "+getValue() );
}
});
The problem is that for some reason, adding that behavior makes the form try to set the model object with a String (even though the AutoCompleteTextField has a generic type of SomeClass), causing a ClassCastException when the onchange event fires.
Is there a way to use AutoCompleteTextField without it being AutoCompleteTextField<String>? I couldn't find any example. Thanks for your time!
and thanks to the user biziclop for his help in this matter.
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这与事件处理程序无关，它是由于组件中缺少模型类型设置引起的。
表单组件可以从 3 个来源派生模型类型：
PropertyModel或CompoundPropertyModel，则自动解析它。setType()方法。这些是您的选项，您可以选择三个中的任何一个，但我认为 1 比 2 好，而 2 又比 3 好。
更新：您可能已经知道这一点，但如果您的自定义类确实是自定义的，您还需要一个
IConverter来处理 String<->Someclass 转换：您可以将其注册到应用程序或重写组件的getConverter(Class> clazz )方法以返回它。This is unrelated to the event handler, it is caused by the lack of a model type set in your component.
Form components can derive the model type from 3 sources:
PropertyModelor aCompoundPropertyModel.setType()method.These are your options, you can choose any of the three, but I think 1 is better than 2, which is better than 3.
Update: You probably already know this but if your custom class is really custom, you'll also need an
IConverterthat handles the String<->Someclass conversions: you can either register it with the application or override your component'sgetConverter(Class<?> clazz )method to return it.