BlogJava-奇葛格的BLOG-随笔分类-Wicket

Wicket Notes [随时更新]

奇葛格 — Thu, 14 Dec 2006 09:04:00 GMT

1.CheckGroup 中使用Check.而非CheckBox.

2.Form中的组件，纳入CompoundPropertyModel，似乎方可得到rawinput。有待确认。

3.Form如果不使用CompoundPropertyModel，注意给控件设置model。

4.dropdownchoice,未选择情况下提交，即选中了“请选择”。服务器端得到：
   getValue():-1
   getInput():
   getModelObjectAsString():

5.一个model示例：
int cols=5;
int rows=5;

final String[][] values=new String[rows][cols];

form.add(new Loop("rows", rows) {
   populateitem(Item item) {
     final int row=item.getindex();
     item.add(new Loop("cols", cols) {
          populateitem(Item item) {
               final int col=item.getindex();
               IModel model=new Model() {
                    setobject(Component c, Object o) {
                           values[row][col]=o;
                    }

                    Object getObject(Component c) {
                              return values[row][col];
                    }};
                    item.add(new TextField("cell", model));

   });

奇葛格 2006-12-14 17:04 发表评论

setDefaultFormProcessing(false) & type="submit"

奇葛格 — Mon, 11 Sep 2006 09:40:00 GMT

TextField productTag = null;
当使用：
form.add(new Button("verifyTag"){
   public void onSubmit() {
   System.out.println("verifyTag：productTag.getRawInput:"+productTag.getRawInput());
   ......
    if(true)
     info("该产品标识可以使用");
   }
  }.setDefaultFormProcessing(false));

这样的单一form多按钮时，需要注意的是html模板中的input type 应该设置为submit,否则失效：

submit" value="检测唯一性" size="30"/>

另外，想得到输入值，可以使用getRawInput()方法获得，但是在form的onSubmit()中该方法似乎得不到值，有待进一步实验。

奇葛格 2006-09-11 17:40 发表评论

getParent().getModelObject();

奇葛格 — Mon, 11 Sep 2006 07:24:00 GMT

In the following code:

add(new Button("saveButton")

            {
                public void onSubmit()
                {
                    //save form values, redirect
@@                    Product product = (Product)getModelObject();
                    ProductProxy.addProduct(product);
                    setResponsePage(new EditProduct());
                }

});

The line marked @@ is wrong. You ask from the submit button the modelobject. Because the button doesn't have a model (model == null), and the form has a compound model, it will use the component id "saveButton" as an OGNL expression with the form modelobject as base.

This happened because you create an anonymous subclass on the Button. The event handler 'onSubmit' has a this pointer to the button.

This can be solved by changing the line to the following:
Product product = (Product)getParent().getModelObject();

Martijn

On 3/20/06, Vincent Jenks <scientifik.com@...> wrote:

OK, believe it or not, I did just that and *still* cannot get it to work.

Here's my Form class:

    private static class EditProductForm extends Form
    {
        public EditProductForm(String name, Product product)
        {
            super(name, new CompoundPropertyModel(product));

            //get collection of Category items
            IModel catsModel = new LoadableDetachableModel()
            {
                protected Object load()
                {
                    return ProductProxy.getAllCategories(); //via proxy
                }
            };

        //add form components
            add(new TextField("productCode").add(RequiredValidator.getInstance()));
            add(new TextField("name").add(RequiredValidator.getInstance()));
            add(new TextArea("summary").add( RequiredValidator.getInstance()));
            add(new TextArea("description").add(RequiredValidator.getInstance()));
            add(new TextField("unitPrice"));
            add(new TextField("weight"));
            add(new TextField("height"));
            add(new TextField("width"));
            add(new TextField("length"));
            add(new TextField("insuredValue"));
            add(new CheckBox("freeShipping"));
            add(new TextField("thumbnail").add(RequiredValidator.getInstance()));
            add(new TextField("photo").add(RequiredValidator.getInstance ()));

            //add reset button
            add(new Button("cancelButton")
            {
                public void onSubmit()
                {

                    setResponsePage(new EditProduct());
                }
            }.setDefaultFormProcessing(false));

            //add reset button
            add(new Button("saveButton")
            {
                public void onSubmit()
                {
                    //save form values, redirect
                    Product product = (Product)getModelObject();
                    ProductProxy.addProduct(product);
                    setResponsePage(new EditProduct());
                }
            });
        }
    }

The cancel button works now but the save button is now throwing an exception:

wicket.WicketRuntimeException : Method public abstract void wicket.markup.html.form.IFormSubmitListener.onFormSubmitted () of interface java.lang.reflect.Method threw an exception ...
...
Caused by: java.lang.reflect.InvocationTargetException ...
...
Caused by: wicket.WicketRuntimeException: OGNL Exception: expression='saveButton'; path='4:editProductForm:saveButton'
...
Caused by: ognl.NoSuchPropertyException: com.myapp.model.Product.saveButton
...

Here's the form HTML just in case I'm goofing something there:

...













What's wrong w/ this?

Thanks!

奇葛格 2006-09-11 15:24 发表评论

自定义带有校验功能的过滤字段

奇葛格 — Fri, 08 Sep 2006 12:41:00 GMT

代码如下：
public class TextFilteredPropertyColumnIntConvert extends TextFilteredPropertyColumn{
  public TextFilteredPropertyColumnIntConvert(IModel displayModel, String propertyExpression) {
   super(displayModel, propertyExpression);
  }
  public Component getFilter(String componentId, FilterForm form) {
   return new TextFilterIntConvert(componentId,getFilterModel(form),form);
  }
}
public class TextFilterIntConvert extends AbstractFilter{
  private static final long serialVersionUID = 1L;
  private final TextField filter;
  public TextFilterIntConvert(String id, IModel model, FilterForm form){
   super(id, form);
   filter = new TextField("filter", model){
    public IConverter getConverter() {
     return new SimpleConverterAdapter(){
      public String toString(Object value){
         return value != null ? value.toString() : null;
      }
      public Object toObject(String value) {
       Long l = new Long(0);
       try{
        l = Long.valueOf(value);
       }catch(Exception e){
        e.printStackTrace();
       }
       return l;
      }
     };
    }
   };
   filter.setConvertEmptyInputStringToNull(false);//TextField默认设为true，如果没有输入，转为null。此处设为空字符串""
   enableFocusTracking(filter);
   add(filter);
  }
  public final TextField getFilter(){
   return filter;
  }
}

奇葛格 2006-09-08 20:41 发表评论

wicket Q&A

奇葛格 — Thu, 07 Sep 2006 01:09:00 GMT

> I have a requirement that I need to cofigure the language encoding based on
> the Request Header "accept-charset". If this is not available than we have
> our default charset.

It is already implemented The default is UTF-8 and can be configured
via getRequestCycleSettings().setResponseRequestEncoding(String)

2
> Why there's no setConverter(IConverter c) just like add(IValidator v) returning the object itself?

to elaborate a little
lets say we did let you use a setter
then we have to keep a reference to the converter in the Component, so when serialized it is one more object - that almost never changes - that has to be serialized. making components session footprint even bigger.
also if we let you use a setter we have to version the changes - so thats yet another object we have to add to session (the undo object)
by making getconverter() overridible we eliminate the two scenarios above.
-Igor

3
>I'm getting unpredictable exceptions about expired pages, so I'm requesting some information about them. I'm using the >latest snapshot of 1.2 (core and extensions).
>What causes pages to be expired?
>How can I prevent pages from throwing expiration exceptions?
>If a page is expired, how can I present a custom page to the user?

when a url is accessed for a page that cannot be found in the pagemap it is considered an expired page.

so basically you create a page, some time passes and that page is removed from the pagemap via the page eviction strategy. so if you go back to that page and click a link, that url will try to retrieve the page from the pagemap, and since the page cannot be found you get the page expired page.
you can set your own via Application.getApplicationSettings().setPageExpiredErrorPage()

奇葛格 2006-09-07 09:09 发表评论

filtertable form

奇葛格 — Mon, 04 Sep 2006 10:57:00 GMT

在用wicket实现过滤表格中加入表单这样的功能时，达不到预期效果。非常高兴Igor给出了说明和建议：

filter toolbar was not meant to be embedded in another form because it uses a form of its own, so for right now i would say that usecase is not supported. please add an rfe for it.

if you want one right now then you have to create your own variant that doesnt use an embedded form. it would be pretty much a copy and paste job of the current toolbar but w/out the form.

-Igor

再一次感谢Igor，每次都是这位老大帮我解决相关问题。
http://www.nabble.com/filtertable-and-checkgroup-cannot-work-together-tf2195268.html

奇葛格 2006-09-04 18:57 发表评论

设置Wicket资源路径

奇葛格 — Tue, 15 Aug 2006 07:08:00 GMT

[http://blog.csdn.net/wl_95421/archive/2005/09/09/476258.aspx]

使用Eclipse的编译输出的include和exclude
不将HTML文件编译到classes下面去

然后写一个自己的Application类,继承WebApplication

public AuthenticateApplication()
{
String t_ClassFolder = AuthenticateApplication.class.getResource("//").getPath();
Folder t_BaseFolder = new Folder(t_ClassFolder);
Folder t_Folder = new Folder(t_BaseFolder.getParent() + "\\src\\java\\");
Path t_Path = new Path(t_Folder);

// this.getSettings().setResourceFinder(t_Path);
this.getSettings().setSourcePath(t_Path);

this.getSettings().setResourcePollFrequency(Duration.ONE_MINUTE);
// 将\WEB-INF\src\java目录也作为查找Html文件的路径
// 并每隔每秒检查一次文件是否被修改
// 如果修改了就重新载入

}

奇葛格 2006-08-15 15:08 发表评论