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lakkarajumurali

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Retain the value of Drop down box in jsp

Hi,

I have a JSP with several drop down boxes.  When the user clicks on submit button the page is submitted and again redirected to the same page with some results added in the bottom of the page.  In this process, the values which are selected in the drop down box are also refreshed (expected).  Now i want to retain the selected value in the drop down box, which am not finding a way to do it through jsp or javascript.  Here is my code snippet:

<form action="tremorEntry.do" method="post" id="teForm">
      <div id="dataEntryPoint" style=" background-color: activeborder; table-layout: auto; margin: 2px; margin-top:10px; margin-left:10px; width:1200px; height:80px; border: thin; border-color: black; border-style: dotted; ">
            <table>
                  <tr>
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="startDateLbl" class="setFont" >Start Date/Time : </label>
                        </td>
                        <td>
                              <input id="startDate" class="setFont" name="startDate" title="Start Date/Time" type="text" value="<% out.write(request.getParameter("startDate")); %>"/>
                        </td>
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="endDateLbl" class="setFont" >End Date/Time : </label>
                        </td>
                        
                        <td>
                              <input id="endDate" name="endDate" class="setFont" title="End Date/Time" type="text" value="<% out.write(request.getParameter("endDate")); %>"/>
                        </td>
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="view" class="setFont" >View : </label>
                        </td>
                        <td>
                              <select id="view" name="view" class="setFont" style="width: auto;" tabindex="0">
                                    <option selected="selected">Choose One</option>
                                    <option>Vertical</option>
                                    <option>Component</option>
                                    <option>Widget</option>
                                    <option>User Guid</option>
                                    <option>Session Id</option>
                                    <option>Root Guid</option>
                              </select>
                        </td>
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="applicationLbl" class="setFont" >Application : </label>
                        </td>
                        <td>
                              <select id="application" name="application" class="setFont" style="width: auto;" tabindex="0">
                                    <option>Choose One</option>
                                    <option>Build Reports</option>
                                    <option>Clear App</option>
                                    <option selected="selected">Security</option>
                                    <option>Document</option>
                                    <option>Clear EDD</option>
                                    <option>Unknown</option>
                              </select>
                        </td>
                  </tr>      
                  <tr style="height: 20px;">
                  </tr>
                  <tr>
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="timeRangeLbl" class="setFont" >Time Range: </label>
                        </td>
                        <td>
                              <select id="timeRangeSel" name="timeRangeSel" class="setFont" style="width: auto;" tabindex="0">
                                    <option selected="selected">15 Minute</option>
                                    <option>Minute</option>
                                    <option>Day</option>
                                    <option>Month</option>
                              </select>
                        </td>                        
                        <td style="width: 2pc"></td>
                        <td>
                              <label id="middleTierLbl" class="setFont" >Middle Tier : </label>
                        </td>
                        <td>
                              <select id="middleTierSel" name="middleTierSel" class="setFont" style="width: auto;" tabindex="0">
                                    <option selected="selected">Client</option>
                                    <option>Production</option>
                              </select>
                        </td>
                        <td style="width: 80px;">
                        </td>
                        <td>
                              <span id="submitSpan">
                                          <input id="submitBtn" value="Submit" type="submit"/>
                                          <input id="hiddenBtn" type="hidden"/>
                              </span>
                        </td>
                  </tr>
            </table>
      </div>
</form>

Thanks,
Murali.
Avatar of Sudhindra A N
Sudhindra A N
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try with the below code..
 
<select id="view" name="view" class="setFont" style="width: auto;" tabindex="0">
  <option value="" selected="selected">Choose One</option>
  <option value="Vertical" <% if(request.getParameter("view").equals("Vertical") { out.println("selected='selected'); }  %>>Vertical</option>
  <option value="Component" <% if(request.getParameter("view").equals("Component") { out.println("selected='selected'); }  %>>Component</option>
  <option value="Widget" <% if(request.getParameter("view").equals("Widget") { out.println("selected='selected'); }  %>>Widget</option>
  <option value="User Guid" <% if(request.getParameter("view").equals("User Guid") { out.println("selected='selected'); }  %>>User Guid</option>
  <option value="Session Id" <% if(request.getParameter("view").equals("Session Id") { out.println("selected='selected'); }  %>>Session Id</option>
  <option value="Root Guid" <% if(request.getParameter("view").equals("Root Guid") { out.println("selected='selected'); }  %>>Root Guid</option>
</select>

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BR-Sudhindra-www.clicksperday.com
Avatar of lakkarajumurali
lakkarajumurali

ASKER

it says selected cannot be resolved.  here is how it is now.

<option value="<%if(request.getParameter("view").equals("Vertical")) {out.println(selected="selected"); } %>">Vertical</option>
sorry change it to...

<option value="<%if(request.getParameter("view").equals("Vertical")) {out.println('selected="selected"'); } %>">Vertical</option>
am getting the following exception:

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/VtqForm.jsp at line 217

214:                         <td>
215:                               <select id="view" name="view" class="setFont" style="width: auto;" >
216:                                     <option value="" selected="selected">Choose One</option>
217:                                     <option value="<%if(request.getParameter("view").equals("Vertical")) {out.println("selected='selected'"); } %>">Vertical</option>
218:                                     <option value="<%if(request.getParameter("view").equals("Component")) {out.println("selected='selected'"); } %>">Component</option>
219:                                     <option value="<%if(request.getParameter("view").equals("Widget")) {out.println("selected='selected'"); } %>">Widget</option>
220:                                     <option value="<%if(request.getParameter("view").equals("User Guid")) {out.println("selected='selected'"); } %>">User Guid</option>


Stacktrace:
      org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
      org.apache.jsp.WEB_002dINF.jsp.VtqForm_jsp._jspService(VtqForm_jsp.java:350)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
ASKER CERTIFIED SOLUTION
Avatar of rrz
rrz
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thanks it works!