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Title: JSP Tag Libraries
ISBN: 193011009X
US Price: $35.96
Publication Date: May 2001
Pages: 656
© 2001 Manning Publications Co.

Reviews : Java Books :
JSP Tag Libraries : Chapter 10: Iterating with Tags

10.4.2 Printing the shopping cart with IterateTag

All of the scriptlets in listing 10. 13 can be eliminated by making use of our new IterateTag as in listing 10.14. Executing the JSP code on a sample cart content yielded the response presented in figure 10.2.

Listing 10.14 JSP file that uses custom tags to present the cart information 

<%@ page errorPage="error.jsp" %> 
<%@ taglib 
	uri=" http://www.manning.com/jsptagsbook/iteration-taglib"  
	prefix=" iter" %> 
<%@ taglib 
	uri=" http://www.manning.com/jsptagsbook/conditions-taglib" 
	prefix=" cond" %> 
<%@ taglib 
	uri=" http://www.manning.com/jsptagsbook/beans-taglib" 
	prefix=" bean" %> 


<html> 
<body> 

<cond: with name=" cart" property="empty"> 
<cond: test condition="eq true"> 
	Your cart is empty. 
</cond:test> 
<cond: test condition="eq false"> 

Your cart contains the following products: 

<table> 
	<tr>< th> Product</th> <th> Quantity</th> <th> Price</th> </tr> 

<iter:iterate name="cart" property="products" id="product">  
	<tr> 
		<td>< bean: show name="product" property="name"/> </td> 
		<td>< bean: show name="product" property="quantity"/></td>  
		<td>< bean: show name="product" property="dollars"/>. 
		<bean: show name="product"property=" cents"/>$</td> 
	</tr> 
</iter:iterate> 
<tr> 
	<td> Totals< td> 
	<td>< bean:show name="cart" property="dollars"/>.  
		<bean:show name="cart" property="cents"/>$< td> 
<tr> 
</table> 


</cond:test> 
</cond:with> 
</body> 
</html>

References all the TLDs we use.

Enumerates the products (using the enumeration property).

Presents the product's properties.

Presents the total price (property of the cart).

Comparing listings 10.13 and 10.14 shows the advantages of using custom tags. Listing 10. 14 is much simpler: all the curly brackets, type casting, and the like are gone, and it is readable by almost anyone. Moreover, all tag supporting tools can manipulate the file and we feel certain that they will be able to get along with our custom tags. Listing 10.13 is littered with endless scriptlets to the point that developing the page without a programmer's help is very difficult. Which page would you prefer to have your HTML coder maintain?

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