Passing values to param value dynamically in jsp

I need to pass param values dynamically.If i tried to assign a variable to value attribute ,Its saying, must enclose within string. How to assign value dynamically?

My code goes here,

In the place of "12" i want to dynamically pass values.

What did you try, which caused the error?

i tried to get the request parameter and pass the value to the applet.

Should work, provided EL is on.

Neeba Rebbaca wrote:i tried to get the request parameter and pass the value to the applet.

<!% String str = request.getParameter("name"); %> . . . <jsp:param name="type1" value=str ></jsp:param>

Not a good idea anyway. Your variable str is not thread safe.

Is there any other best practise?

Neeba Rebbaca wrote:Is there any other best practise?

Without scriptlet you can directly get the reuest params through "${param.nameOfTheParameter}"

can you explain me in detail(because i'm new to J2EE)

do you mean this,

>

Neeba Rebbaca wrote:can you explain me in detail(because i'm new to J2EE)
do you mean this,
<jsp:param name="type1" value="${requestParameter("name")}" ></jsp:param >

"param" is an implicit EL variable (of type Map) which holds request parameter name/value pairs. You can access the parameter value by it's name like above.

i tried to get the request parameter and pass the value to the applet.And this is my html,here i want to pass the parameter test's value (2) to the applet

here, the output should display as 2 , but i'm getting only a empty string.where i'm making the mistake.

Not sure whether we can mention any query string in form action, however this should work.

Neeba Rebbaca wrote:.. here, the output should display as 2 , but i'm getting only a empty string.where i'm making the mistake.

That's not possible with "form" tag which meant to submit the form data. How ever you can have a "anchor" tag somewhere and that also will work like the "input" tag suggested above.
OR

Neeba Rebbaca wrote:i tried to get the request parameter and pass the value to the applet.

<!% String str = request.getParameter("name"); %> . . . <jsp:param name="type1" value="<%= str %>"; ></jsp:param>

This will solve your problem
<%=expression %>.These are the expression tags.It is equivalent println statement in java.

Correct, but what you are using is not using expression language which is more recommended these days.

Bhaavyaa K. Kapoor wrote:

Neeba Rebbaca wrote:i tried to get the request parameter and pass the value to the applet.

<!% String str = request.getParameter("name"); %> . . . <jsp:param name="type1" value=<%= str %> ></jsp:param>

This will solve your problem
<%=expression %>.These are the expression tags.It is equivalent println statement in java.

Hi Bhaavyaa, Welcome to JavaRanch

. These days people never use Java code (scriptlet,scriptlet expressions etc..) in JSPs but JSTL,EL, Standard & Custom actions.

Vijitha Kumara wrote:

Bhaavyaa K. Kapoor wrote:

Neeba Rebbaca wrote:i tried to get the request parameter and pass the value to the applet.

<!% String str = request.getParameter("name"); %> . . . <jsp:param name="type1" value=<%= str %> ></jsp:param>

This will solve your problem
<%=expression %>.These are the expression tags.It is equivalent println statement in java.

Hi Bhaavyaa, Welcome to JavaRanch . These days people never use Java code (scriptlet,scriptlet expressions etc..) in JSPs but JSTL,EL, Standard & Custom actions.

Thanks for telling me.I have just started learning jsp and hence i am just a beginner