In order to answer this question, some background is needed.
If you know the product's id (whatever you use, where it's SKU number or a
surrogate key) ... what is the exact process from going from that to a URL
suitable for an <img> tag?
That is ... are the images stored in the database? Or are they on the file
system somewhere? If they are files on the file system, are those files
mapped to a client-visible URL?
In the latter case, you can do something like:
<img t:id="productImage" src="prop:productImageURL"/>
public String getProductImageURL() {
return "http://static.myco.com/product-images/"; + _productId + ".gif";
}
Assigning a t:id to a tag without specifying a component type creates an Any
component, a component that just renders whatever tag and informal
parameters you provide it. Here wer'e linking that to some Java code in the
corresponding page or component that computes the URL of the product based
on an instance variable. Probably your example is more complicated, but you
get the idea.
There's another approach used when the data is inside the database, but we
can dive into that if the above solution is insufficient.
Assets are useful for accessing resources inside the web application
context, or on the classpath, and includes logic related to localization ...
but it is not always appropriate when accessing resources that are well
outside the web application itself.
On 5/19/07, Allen Guo <[EMAIL PROTECTED]> wrote:
Hi All,
I want to show the ProductDetail page with product image. It looks like
<img src="p_001.jpg" />.
You know, every product has different image name,so I need to pass the
string 'p_001.jpg' to the corresponding page.
As result the img tag should look like <img src="${product.image}"/> or
I can use Asset to do it.
But I tried to do it using the first approach, exception occured.
And I don't know how to the second approach.
Can anyone give me an idea?
Thank in advance
Allen Guo
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Howard M. Lewis Ship
TWD Consulting, Inc.
Independent J2EE / Open-Source Java Consultant
Creator and PMC Chair, Apache Tapestry
Creator, Apache HiveMind
Professional Tapestry training, mentoring, support
and project work. http://howardlewisship.com
