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JSP Discussion Thread
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Jan 5th, 2009

Create Dynamic Hyperlink

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Hi Experts!
I am trying to build dynamic hyperlinks but i cant do this. i am new to JSP. please guide me.
here is my code:

JSP Syntax (Toggle Plain Text)
<%
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "root", "root");
statement = connection.createStatement();
rs = statement.executeQuery("SELECT * FROM contacts");
while (rs.next()) { %>
<a href="viewdata.jsp?value1="+<%rs.getString(1)%>+">"+<%out.println(rs.getString(1));%></a>
 
<%}
rs.close();
}
catch(Exception e)
{
out.println(e);
}
 
%>
<%
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "root", "root");
statement = connection.createStatement();
rs = statement.executeQuery("SELECT * FROM contacts");
while (rs.next()) { %>
<a href="viewdata.jsp?value1="+<%rs.getString(1)%>+">"+<%out.println(rs.getString(1));%></a>

<%}
rs.close();
}
catch(Exception e)
{
out.println(e);
}

%>

how can i build the dynamic hyperlink with out.println inside JSP <%%> tag

regards
Khalid Mehmood

Last edited by peter_budo; Jan 5th, 2009 at 5:46 am. Reason: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks) and [icode] (inline code) tags.

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khalidmehmood

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Jan 5th, 2009

Re: Create Dynamic Hyperlink

Data retrieved from database with use of servlet (not like your attempt above), returned back or passed to next page where with use of JSTL you would be able to do it much simpler.
You can pick up some general hints and tips from this tutorial

peter_budo

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Jan 5th, 2009

Re: Create Dynamic Hyperlink

Also when you write something outside the <% %> it is displayed the way you write (HTML style).

So when you write this:

<a href="viewdata.jsp?value1="+sth+">"+ . . .

It will not concat. It is not java and it is not a String to concat it.
If you want to display the value of a variable do this:
<%= rs.getString(1)%>
It will put whatever value it has as "part" of the HTML page.
So might want to write this:

JSP Syntax (Toggle Plain Text)
<a href="viewdata.jsp?value1=<%= rs.getString(1)%>"><%=rs.getString(1)%></a>
<a href="viewdata.jsp?value1=<%= rs.getString(1)%>"><%=rs.getString(1)%></a>

No semicolon inside the <%= %> and notice the: "" of the href, as well as where the <> opens and closes:

<a href= "viewdata.jsp?value1=<%= rs.getString(1)%>" >
<%=rs.getString(1)%>
</a>

Also make sure to read peter_budo's post and follow his advice. My post was just for informative purposes. It is not correct to open database connections inside a jsp, and use the ResultSet that way to create a link

Last edited by javaAddict; Jan 5th, 2009 at 6:57 am.

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Jan 5th, 2009

Re: Create Dynamic Hyperlink

OK Thanks i will try this approach, but whats problem with this syntax?

khalidmehmood

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Jan 5th, 2009

Re: Create Dynamic Hyperlink

One more thing that I forgot to add in the example.
If you want the HTML to create a link like this:

<a href="viewdata.jsp?value1=John">John</a>

The jsp should be:

<a href="viewdata.jsp?value1=<%= rs.getString(1)%>"><%= rs.getString(1)%></a>

javaAddict

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Jan 6th, 2009

Re: Create Dynamic Hyperlink

ok thanks a lot.

khalidmehmood

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Jan 9th, 2009

Re: Create Dynamic Hyperlink

> but whats problem with this syntax?

The changes to internal implementation of the model [business logic + data] which affect the view which shouldn't be the case. Also a design which employs separation of concern is far more easier to maintain, change and troubleshoot.

~s.o.s~

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Jan 19th, 2009

Re: Create Dynamic Hyperlink

JSP Syntax (Toggle Plain Text)
while (rs.next()) { 
String abc=rs.getString("YourVariableInContactDatabase");
out.print("<a href=\"viewdata.jsp?value1="+abc+"\">"+abc+"</a>");
}
while (rs.next()) { 
String abc=rs.getString("YourVariableInContactDatabase");
out.print("<a href=\"viewdata.jsp?value1="+abc+"\">"+abc+"</a>");
}

Is this wat u mean?

dreamer14

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Jan 20th, 2009

Re: Create Dynamic Hyperlink

Yes exactly thanks a lot brother for your kind suggestion, GOD bless you...
best regards
Khalid Mehmood

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Jan 20th, 2009

Re: Create Dynamic Hyperlink

Nothing to bless. You dealing with database connection from view, JSP document, that is bad thing to do. Ever heard of MVC Model2?

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