Combining Scriptlets with HTML

By: aathishankaran Emailed: 1700 times Printed: 2205 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

Combining Scriptlets with HTML

We have already seen how to use the "out" variable to generate HTML output from within a scriptlet in previous articles. For more complicated HTML, using the out variable all the time loses some of the advantages of JSP programming.  It is simpler to mix scriptlets and HTML.

         Suppose you have to generate a table in HTML.  This is a common operation, and you may want to generate a table from a SQL table, or from the lines of a file.  But to keep this example simple, here we will generate a table containing the numbers from 1 to N.  Here this program will show you the technique.

 

Here is the JSP fragment to do it:

 

<TABLE BORDER=2>

<%

    for ( int i = 0; i < n; i++ ) {

        %>

        <TR>

        <TD>Number</TD>

        <TD><%= i+1 %></TD>

        </TR>

        <%

    }

%>

</TABLE>

 

You would have to supply an int variable "n" before it will work, and then it will output a simple table with "n" rows.

 

The important things to notice are how the %> and <% characters appear in the middle of the "for" loop, to let you drop back into HTML and then to come back to the scriptlet.

 

The concepts are simple here -- as you can see, you can drop out of the scriptlets, write normal HTML, and get back into the scriptlet.  Any control expressions such as a "while" or a "for" loop or an "if" expression will control the HTML also.  If the HTML is inside a loop, it will be emitted once for each iteration of the loop.

 

Another example of mixing scriptlets and HTML is shown below -- here it is assumed that there is a boolean variable named "hello" available.  If you set it to true, you will see one output, if you set it to false, you will see another output.

 

<%

    if ( hello ) {

        %>

        <P>Hello, world

        <%

    } else {

        %>

        <P>Goodbye, world

        <%

    }

%>

 

It is a little difficult to keep track of all open braces and scriptlet start and ends, but with a little practice and some good formatting discipline, you will acquire competence in doing it.


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 )
The Advantages of JSP
What are the different scopes in JSP?
JSP CheckBox Example
The JSP Program running first Time.
Tags using in jsp
Combining Scriptlets with HTML
Tag libraries
A Servlet That Generates HTML
An Example Using Servlet Initialization and Page Modification Dates
Simple HTML-Building Utilities
Form Object
Retrieving a Portion of a String
Comparison operators in JSP
Automatically Including Preludes and Codas in JSP
The Tag Life Cycle with Attributes in JSP
Most Emailed Articles (in JSP)
What is JSP?
Declaring variable in JSP
A Servlet That Generates HTML
Retrieving a Portion of a String
JSP Example to connect to MS SQL database using Tomcat Connection Pool
The Application Object in JSP
Cookies using JSP or Java Bean
Click to Activate and Use this control
The JSP Program running first Time.
Scriptlets
Server Side Programming
Syntax For JSP Declaratives
Embedding java codes in jsp sciptlets
Tags using in jsp
JSP pages in servlet