Given the information that was passed back and forth on this conversation, I
have a question for you guys.
I am working on a project where I need to do some validation against a
database with the "username and password". Since they will be inputing this
in on the html side and I need to do validation on the Servlet side, would I be
doing the same thing(or something similar)? I understand how to pass it back
now but how would this work on TextFields or would I shoot the data back
to the servlet on the "onClick" of the Login button?
Any suggestion you would have would be greatly appreciated.
Jeremiah
On Tue, 16 Nov 1999, you wrote:
> But how do I pass the parameter 'category' to the ServletB as a variable in
> the following as suggested by you.
>
> <tr><td>
> <a href="/servletB?category=xxxxx">yyyyy</a>
> </td></tr>
>
> That is what I am finding tricky to do.
>
> Manoj
>
>
> >From: "Craig R. McClanahan" <[EMAIL PROTECTED]>
> >Reply-To: "A mailing list for discussion about Sun Microsystem's Java
> > Servlet API Technology." <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: Re: passing valuees from javascript to servlets
> >Date: Tue, 16 Nov 1999 08:20:49 -0800
> >
> >manoj kumar wrote:
> >
> > > Hi Andras/Pradeep,
> > >
> > > Thanks for the help.
> > > My problem is a little bit more complicated.
> > > I am able to pass values from a HTML element to a Servlet.
> > > My problem is that based on that value I want to fire a query on a
> >table.
> > > Let me further expalin the problem.
> > > Upon clicking a HTML link(or button), a servlet is called(A), which
> >fires a
> > > select query on a table
> > >
> > > select category_description from category_master
> > >
> > > The result of this query is formatted into an html page and sent back
> > > to browser.Now the user selects a particular category and presses
> > > submit/next(whatever).This results in a call to another servlet(B) or
> > > the same servlet(A,how..?) which in turn fires another query
> > >
> >
> >You don't need JavaScript to do this, although you could use it for some
> >fancier user interface effects.
> >
> >The simplest approach:
> >
> >* Change the above query to something that selects the
> > key as well as the description:
> >
> > select category_code, category_description
> > from category_master
> >
> >* In servlet A (the one that does the query above), create
> > an HTML table with one row per category. The table will
> > show the descriptions in a column.
> >
> >* For each category description, create a hyperlink to your
> > second servlet, passing the category code as a query
> > parameter. You'll end up with something like this:
> >
> > <tr><td>
> > <a href="/servletB?category=xxxxx">yyyyy</a>
> > </td></tr>
> >
> > where "/servletB" is the URL of your second servlet,
> > xxxxx is the category code for this row, and yyyyy is
> > the category description for this row.
> >
> >* The user sees a list of hyperlinks. When he or she clicks
> > one, it calls servlet B and passes the category code of the
> > selected category. In servlet B, you can retrieve this with:
> >
> > String category = request.getParameter("category");
> >
> >* Use this to dynamically construct your second SQL statement.
> >
> > >
> > > select product_name from product_master where category_code=xxxxxx
> > > This 'xxxxxxx' is something which should correspond to the category
> >selected
> > > by the user in the previously generated html page(by servlet A).
> > > I was thinking of making it possible through javascript but couldn't
> >find a
> > > solution.
> > >
> >
> >You could use a similar approach to the above to create, for example, a
> ><select> element for the categories instead of a list. If you add an
> >"onchange" JavaScript event handler, you could even have it submit the
> >request
> >immediately, without waiting for another button to be pressed. See one of
> >the
> >many web sites focused on JavaScript for details of how to do this.
> >
> > >
> > > hope this clears the idea.
> > >
> > > help is immidiately needed.
> > >
> > > thanks
> > >
> > > manoj
> > >
> >
> >Craig McClanahan
> >
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