CODEWITHSUNDEEP
javahtmljspservlets
developerCoder
developerCoder

Reputation: 176

JSP input comes null to servlet

I'm trying to pass parameter to jsp to servlet. And my code is :

Server side :

String kullanici = (String)request.getParameter("onaylayici");

JSP side :

<input type="text" name ="onaylayici">

When i run it on localhost kullanici variable comes null. Any solution ?

EDİT :

<form name = "main" method = "POST">
<td class="summary"><b>İsteği Onaylanacak Kişi : 
<input type="text" name ="onaylayici">  <br>
</form>

Upvotes: 0

Views: 3981

Answers (7)

Momade Vasconcelos
Momade Vasconcelos

Reputation: 1

< input type="text" name ="onaylayici" value="<% if(kullanici!=null){out.print(request.getAttribute(kullanici))} %>">

<% /Hope this helps!/%>

Upvotes: 0

Kapil Jituri
Kapil Jituri

Reputation: 1261

Don't know why but it worked for me when I provided 'name' attribute to input text.

My Old code which returned null in Servlet:

<input id="closure" type="text" size="25"><a
                        href="javascript:NewCal('closure','ddmmyyyy')"><img
                            src="drawables/cal.gif" width="16" height="16" border="0"
                            alt="Pick a date"></a>

Just putting name="closure" worked for me. Now it perfectly returns value of this input text into servlet.

<input id="closure" name="closure" type="text" size="25"><a
                        href="javascript:NewCal('closure','ddmmyyyy')"><img
                            src="drawables/cal.gif" width="16" height="16" border="0"
                            alt="Pick a date"></a>

And I am getting value of this input text in Servlet as follows:

String closure = request.getParameter("closure");

Upvotes: 0

JDGuide
JDGuide

Reputation: 6525

Your code is ok, but a small mistake . You have not set the request data to the response page. So, You have to set the requested data to response as follow:-

Change on Server Side -

//Get the data from JSP
String myDataInServer = (String)request.getParameter("onaylayici");
//Set the data to response by request.setAttributes
request.setAttributes("onaylayici",myDataInServer);

JSP (Client Side )-

String kullanici = (String)request.getParameter("onaylayici");

Now it will work. Hope it will help you.

Upvotes: 0

fGo
fGo

Reputation: 1146

I think you mean that you want to go FROM a jsp TO a servlet. If that's the case, look the action attribute:

<form action='/MyServlet' ...>
  ...
</form>

If you are going FROM a Servlet TO a jsp then you could reuse current request attribute. You do it by settng the value directly in the . Something similar to this: 

request.setAttribute("onaylayici", request.getParameter("onaylayici"));

in your servlet. Then, in your jsp this:

<input name='onaylayici' type='text' value='${requestScope["onaylayici"]}'/>

Upvotes: 1

developerCoder
developerCoder

Reputation: 176

My solution is :

<input name='onaylayici' type='text' value='${requestScope["onaylayici"]}'/>

Note : Thanks fGo ...

Upvotes: 0

HashimR
HashimR

Reputation: 3833

If you want to set your parameter value in Servlet and read it in JSP, then you need to do the following:

In Servlet:

request.setAttribute("yourParamName", request.getParameter("yourParamValue"));

and in your JSP:

<input name='yourParamName' type='text' value="<%=request.getAttribute("yourParamName")%>" />

Upvotes: 0

Diansonn
Diansonn

Reputation: 7

There are only form's name and method, without the action, the JSP don't know where to send its arguments, and the server can't receive the arguments too. For example:

<form action="/servlet/Test" method="post">
  ... 

</form>

Upvotes: 0

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