> Hmm .. how about using an array to keep track of the parameters passed to
POST
> and renaming all your form elements to "form_input", then you could use:
>
> String sInputValues[] = (String []) req.getParameterValues("input");
>
> And rearrange the input anyway you'd like. Just an idea.
>
> - Jon
Doing this is a very bad idea because you will lose context information
about which parameter has which value.
> Message UK wrote:
>
> > Hi there.. I have a problem with getting parameters in a servlet -
> > specifically the order in which my parameters are submitted. My html
code is
> > as follows (abbreviated):
> >
> > <FORM NAME="user_profile" ACTION="../servlet/MyServlet3" METHOD=GET
> > TARGET="_self">
> >
> > <INPUT TYPE="hidden" NAME="fact_name" VALUE="user_profile">
> >
> > <SELECT NAME="country"><OPTION VALUE="uk"> UK etc.,</SELECT>
> >
> > <INPUT TYPE="radio" NAME="hiv_status" VALUE="HIV positive"> HIV
positive<BR>
> > etc.,
> >
> > <SELECT NAME="age"><OPTION VALUE="under 18"> under 18 etc.,</SELECT>
> >
> > <INPUT TYPE="radio" NAME="sex" VALUE="female"> female<BR>
> >
> > <INPUT TYPE="submit" VALUE="submit"></FORM>
> >
> > and my servlet code needs the HIDDEN field (fact_name) to be retrieved
> > first:
> >
> > Enumeration enum = req.getParameterNames();
> > String name = null;
> > String value = null;
> >
> > while (enum.hasMoreElements())
> > {
> > file://gets each parameter one at a time
> > name = (String) enum.nextElement();
> > value = req.getParameter(name);
> >
> > out.println(name + value + "\n");
> > <snip>
> >
> > try{
> > file://use first parameter to name the fact
> > if("fact_name".equals(name)){//i.e. the parameter is the name of the
fact
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > <snip>
> >
> > this code above relies on the hidden field in my html code being the 1st
> > parameter retrieved...
> >
> > but I'm actually getting the parameters in this order (when I print them
out
> > after the value = req.getParameter(name); (see above):
> >
> > 1.hiv_status
> > 2.country
> > 3.age
> > 4.sex
> > 5.fact_name
> >
> > Does anyone know how to control the order in which parameters are
submitted,
> > or any other help as to what I'm not doing?? Many thanks! D Lampon
> >
There is no guaranteed order in which parameters are provided by the request
object or the browsers and neither
is it important.
The only order that mattes is the order in which you retrieve them.
So in order to achieve the effect of ordering that you seem to need you can
simply do the following
// 1st parameter to be retrieved is
String factName = request.getParameter("fact_name");
// And retrieve your parameters in any order you wish.
If you wanted to you can force order like this
String parametersInOrder[] = {"fact_name", "hiv_status", "country", "age",
"sex"};
String parameterValuesInOrder = new String[paramtersInOrder.length];
for(int i=0;i<parametersInOrder.length;i++) {
parameterValuesInOrder[i] = request.getParameter(parametersInOrder[i]);
}
A word of caution though, you should never rely on any of the parameters
being present or having valid values.
ALWAYS check for null and invalid values for parameters before using them.
Remembers, the order in which parameters are accessed can and should be
determined by you, not the browser and not the
form.
Hope this helps
Andy Bailey
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