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刘铮 — Mon, 05 Nov 2007 09:42:00 GMT

不同于jsp。��用getter�Q�setter�Ҏ��Q�在老的��面中setter参数�Q�在新的��面中getter参数
例子�Q?br />
public class Home extends BasePage {
private String stockId;
...
public IPage onOk(IRequestCycle cycle) {
int stockValue = stockId.hashCode() % 100;
Result resultPage = (Result) cycle.getPage("Result");
resultPage.setStockValue(stockValue);
return resultPage;
}
}

public class Result extends BasePage {
int stockValue;
public int getStockValue() {
return 100stockValue;
}
public void setStockValue(int stockValue) {
this.stockValue = stockValue;
}
}

刘铮 2007-11-05 17:42 发表评论

Tapestry中页面��时存储变量的�Ҏ��

刘铮 — Mon, 05 Nov 2007 08:44:00 GMT

Tapestry有一�U�相��g��ServletContext的功能，能够在一个session范围或一个web application内存储变量的�Ҏ��

�Ҏ��如下�Q?br /> @Persist("client")//可以选择是保留在客户端，�q�是session�?br /> public abstract void setXXX(int XXX);
public abstract int getXXX();
而且�q�种储存可以在direct link和form 的提交中传�?

刘铮 2007-11-05 16:44 发表评论

刘铮 — Mon, 05 Nov 2007 07:46:00 GMT

after using a page object
(e.g., the Result page object), Tapestry will not throw it away. Instead, it will put it into a pool for reuse (see the diagram
below). Later when it needs to use the Result page object again, it will check if the pool has one. If so, just take it out
from the pool and use it. Only when the pool has no such page object, will it create a new page object.

所以如果在一个新开的浏览器上面�Q�页面上昄��的参��C��会发生改变，
防止�q�种情况的发生可�?br /> 在page-specification中加�?br /> XXX为页面上的变�?br /> 所以对应的��面为抽象的�c?abstract�Q?br /> 对应的变量的get�Q�set�Ҏ��为abstract

刘铮 2007-11-05 15:46 发表评论

刘铮 — Mon, 05 Nov 2007 03:33:00 GMT

Page的java文�g要实现PageValidateListener接口�Q?br /> 完成pageValidate(PageEvent event)�Ҏ��
注意public void pageValidate(PageEvent event) {
if (!getUserExists()) {
Login login = getLoginPage();
login.setNextPage("Confirm");
throw new PageRedirectException(login);
}
}
注意�q�里要用PageRedirectException�Ҏ��Q�因为As the rendering
has begun, calling activate() will have no
effect. To interrupt the rendering of the
current page and render another page,
you need to throw a
PageRedirectException.

�q�里是服务器内部跌��{
The URL displayed in the
browser will not be changed
because the redirection
happens inside Tapestry
only.

刘铮 2007-11-05 11:33 发表评论

刘铮 — Mon, 05 Nov 2007 02:33:00 GMT

The problem here is that if you store something into the session, it should be something per-user instead of something
per-page. Clearly the current product id is a per-page thing, not a per-user thing. So using a client persistent property is
a much better choice.
client的方法：
@Persist("client")
session的方法：
@Persist("session")

刘铮 2007-11-05 10:33 发表评论

刘铮 — Sun, 04 Nov 2007 04:02:00 GMT

解决�Ҏ��Q�针对不同的submit使用不同的监听器

例如�Q?br />









public class ProductDetails extends BasePage {
public void addToCart() {
//add product to cart
//...
}
public String continueShopping() {
return "Home";
}
}

刘铮 2007-11-04 12:02 发表评论