Tag libraries

By: aathishankaran Emailed: 1648 times Printed: 2117 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

JSP 1.1 introduces a method of extending JSP tags, called "tag libraries".  These libraries allow addition of tags similar to jsp:include or jsp:forward, but with different prefixes other than jsp: and with additional features.

Each tag-library will have its own tag-library specific documentation.  In order to use the tag library, you use the "taglib" directive to specify where your tag library's "description" resides.  For the tag library, the (recommended) directive is as follows

<%@ taglib prefix="blx" uri="/blx.tld" %>

 The "uri" specifies where to find the tag library description.
The "prefix" is unique for the tag library.  
This directive is saying that we will be using the tags in this library by starting them with blx

The tag library provides a blx:getProperty tag.  This tag can be used to allow the user to edit form data.  In our GetName.jsp file, we will now add a jsp:useBean and place the form inside blx:getProperty.

 The GetName.jsp is

<%@ taglib prefix="blx" uri="/blx.tld" %>
<jsp:useBean id="user" class="user.UserData" scope="session"/>
<HTML>
<BODY>
<blx:getProperty name="user" property="*">
<FORM METHOD=POST ACTION="SaveName.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20><BR>
What's your e-mail address? <INPUT TYPE=TEXT NAME=email SIZE=20><BR>
What's your age? <INPUT TYPE=TEXT NAME=age SIZE=4>
<P><INPUT TYPE=SUBMIT>
</FORM>
</blx:getProperty>
</BODY>
</HTML>

Note that the blx:getProperty doesn't end with /> but is instead terminated by a separate </blx:getProperty> line.  This puts all the form input fields inside the blx:getProperty so they can be appropriately modified by the tag library.

Try putting a link to GetName.jsp from the NextPage.jsp, and you will see that the bean's data shows up automatically in the input fields.

The user can now edit the data.


JSP Home | All JSP Tutorials | Latest JSP Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.



Bookmark and Share

Comments(0)


Be the first one to add a comment

Your name (required):


Your email(required, will not be shown to the public):


Your sites URL (optional):


Your comments:



More Tutorials by aathishankaran
Web Security Issues
The Web User's Perspective
Server-side plug-Ins
The best way to avoid security vulnerabilities with new server
JavaScript Security
Window Object
Working with Status Bar Messages
Retrieving a Portion of a String
Referencing Windows
Math Object
Frame Object
Document Object
Closing Windows
Built-in Object in Javascript
Textarea Object

More Tutorials in JSP
LifecycleException: service.getName(): "Catalina"; Protocol handler start failed: `java.net.BindException: Permission denied <null>:80
JSP Alert Example
JSP CheckBox Example
Uploading an Image to a Database using JSP
Uploading a file to a server using JSP
A JSP page that gets properties from a bean
The page Directive in JSP
The taglib, tag, include, attribute and the variable Directive in JSP
Declarations in JSP
Scriptlets and Expressions in JSP
Tag Libraries in JSP
The Request Object in JSP
The Response Object in JSP
The Out Object in JSP
The Session Object in JSP

More Latest News
Most Viewed Articles (in JSP )
JSP Alert Example
JSP Program for display Date
Arithmetic Evaluation Using the Expression Language in JSP
JSP Example to connect to MS SQL database and retrieve records
What are the different scopes in JSP?
IIS and Tomcat - how to configure to work together
The Session Object in JSP
JSP CheckBox Example
Combining Scriptlets with HTML
JSP Tags for SQL to connect to a database
Encrypting Passwords in Tomcat using Servlets
JSP Example to connect to MS SQL database using Tomcat Connection Pool
Sending Email using JSP
Using UTF-8 in JSP / ASP / HTML pages.
Using a DataSource from WebLogic in a JSP
Most Emailed Articles (in JSP)
LifecycleException: service.getName(): "Catalina"; Protocol handler start failed: `java.net.BindException: Permission denied <null>:80
Tags using in jsp
Tag libraries
What is JSP?
Click to Activate and Use this control
Closing Windows
Frame Object
Introduction to JSP expression language
Disabling Scriptlets in JSP using web.xml
Getting HTTP Request Headers in a JSP
What is JSP?
Cookies using JSP or Java Bean
Syntax For JSP Declaratives
JSP Program for display Date
Sessions in JSP