Struts - Submit action, form fields are dynamic

sxjustin · Jul 12, 2006

Hello,

I have a jsp form with a field SSN1 and a corresponding input field for SSN. I would like to provide a button "Add" which adds one more set of fields to the form (SSN2 text field and it's corresponding input field). If they click on "Add" again, another set will be added(SSN3, it's value field) and so on.

After the user enters required no.of SSNs, the form needs to be submitted by clicking another button "Submit". The question is, here we don't know the form size or fields inadvance. Only after the user clicks on submit, we know how many fields (SSNs with values) are there in the form.

Is there a way that we can handle this sitution in Struts ?

I really appreciate your help.

Thanks,
Justin

feherke · Jul 12, 2006

Hi

In two words : use array. In more words :

[highlight lime]struts-config.xml[/highlight]

Code:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "[URL unfurl="true"]http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">[/URL]

<struts-config>

  <form-beans>
    <form-bean type="stranger.ArrayFormBean" name="ArrayFormBean"/>
  </form-beans>

  <action-mappings>
    <action path="/stranger/array" type="stranger.ArrayAction" name="ArrayFormBean" scope="request" input="/stranger/arrayform.jsp">
      <forward name="success" path="/stranger/arrayresult.jsp" />
    </action>
  </action-mappings>

</struts-config>

[highlight lime]ArrayAction.java[/highlight]

Code:

package stranger;

import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;

public class ArrayAction extends Action
{
  public ActionForward execute(ActionMapping mapping, ActionForm  form, HttpServletRequest request, HttpServletResponse response)
    throws Exception
  {
    ArrayFormBean fb=(ArrayFormBean) form;
    ArrayList list;
    int count;
    
    count=fb.getName().length;
    list=new ArrayList();
    for (int i=0;i<count;i++) list.add(fb.getName()[i]);

    request.setAttribute("count",new Integer(count));
    request.setAttribute("list",list);
      
    return mapping.findForward("success");
  }
}

[highlight lime]ArrayFormBean.java[/highlight]

Code:

package stranger;

import javax.servlet.http.HttpServletRequest;

public class ArrayFormBean extends org.apache.struts.action.ActionForm
{
  private String name[];
   
  public String[] getName() { return name; }
  public void setName(String string[]) { name = string; }
}

[highlight lime]stranger/arrayform.jsp[/highlight]

Code:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib uri="[URL unfurl="true"]http://java.sun.com/jsp/jstl/core"[/URL] prefix="c"%> 
<html>
<body>

<form action="array.do">

<c:set var="count" value="3"/>
<c:if test="${param.count>0}"><c:set var="count" value="${param.count}"/></c:if>
<c:forEach var="i" begin="1" end="${count}">
${i}) <input type="text" name="name[]"><br>
</c:forEach>

<input type="submit" value="Ok">

</form>

</body>
</html>

[highlight lime]stranger/arrayresult.jsp[/highlight]

Code:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib uri="[URL unfurl="true"]http://java.sun.com/jsp/jstl/core"[/URL] prefix="c"%> 
<html>
<body>

You submitted ${count} names :

<ul>
<c:forEach items="${list}" var="one">
<li>${one}</li>
</c:forEach>
</ul>

</body>
</html>

Note, that I did not implemented JavaScript. Simply request arrayform.jsp by passing the count in query string like this :
[navy][ignore]

http://localhost:8888/stranger/arrayform.jsp?count=5

[/ignore][/navy]

Feherke.

http://rootshell.be/~feherke/

sxjustin · Jul 13, 2006

Hi Feherke

Thank you so much for taking time to answer this.

I will try this.

> Justin

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Struts - Submit action, form fields are dynamic

sxjustin

Programmer

feherke

Programmer

sxjustin

Programmer

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