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How to find this value

Posted on 2011-09-12

JavaScript

1 solution

Medium Priority

212 Views

Last Modified: 2012-05-12

Hi experts,

On a webpage there is a drop-down menu that has page numbers like 2, 3, 4. When a user chooses a number, the webpage is supposed to change to that page. However, the script that I have now does not work.

Any help?

Thanks so much.

function submitPage(){

                var box = document.accountreport.pageBox;
                var pgNo = box.options[box.selectedIndex].value;

                document.location.href = "auth_token.htm?pgNo="+ pgNo;
        }

//-----------------------------------------
related part of jsp:

   <form name="accountreport">                            
         <select id="pageBox" name="pageBox" onChange="javascript:submitPage();">
             <c:forEach items="${pages}" var="page" varStatus="loop">
               <option value="<c:out value="${page}"/>" 
                   <c:if test="${page == param.pgNo}">SELECTED</c:if>><c:out value="${page}" />
               </option>
             </c:forEach>

         </select>
    </form>

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Comment

Question by:davidw88

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4 Comments

LVL 82

Accepted Solution

by:hielo

hielo earned 1000 total points

ID: 365257282011-09-12

try:

function submitPage(box){
                var pgNo = '';
                if( box.selectedIndex > -1 )
                  box.options[box.selectedIndex].value;

                location.href = "auth_token.htm?pgNo="+ pgNo + "&cb="+(new Date()).valueOf();
        }

//-----------------------------------------
related part of jsp:

   <form name="accountreport">                            
         <select id="pageBox" name="pageBox" onchange="submitPage(this);">
             <c:forEach items="${pages}" var="page" varStatus="loop">
               <option value="<c:out value="${page}"/>" 
                   <c:if test="${page == param.pgNo}">SELECTED</c:if> ><c:out value="${page}" />
               </option>
             </c:forEach>

         </select>
    </form>

If the above does not work, please open your page in a browser and then extract the browser's source code and post it here so we can see the HTML code that your server script is actually generating.

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LVL 82

Expert Comment

by:hielo

ID: 365257792011-09-12

>> if( box.selectedIndex > -1 )
>> box.options[box.selectedIndex].value;
Should have been:
if( box.selectedIndex > -1 )
pgNo=box.options[box.selectedIndex].value;

Author Comment

by:davidw88

ID: 365258072011-09-12

Thanks hielo! Your solution works perfect.

I have figured out why my old script did not work. It should be something like this:

var boxObj = document.getElementById('pageBox');
var pgNo = boxObj.options[boxObj.selectedIndex].value;

this works.

Author Comment

by:davidw88

ID: 365258152011-09-12

I added "pgNo=" when I tested your script :)

Should have been:
if( box.selectedIndex > -1 )
pgNo=box.options[box.selectedIndex].value;

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