dropdownlist

Question

0.00/5 (No votes)

See more:

i have a dropdownlist like this

<asp:dropdownlist id="DropDownList1" runat="server" onchange="select();" autopostback="True" style="z-index: 128;<br mode=" hold=" /> left: 659px; position: absolute; top: 244px" xmlns:asp="#unknown">
<asp:listitem>--select--
<asp:listitem>1
<asp:listitem>2
<asp:listitem>3
<asp:listitem>4
<asp:listitem>5
<asp:listitem>6
<asp:listitem>

i want that once the user selected the item he/she
will not be able to select that same item second time using java script
i tried ur javascript ie

function select()
{

var item = document.getElementById("DropDownList1").value;
if (item != "Select") {
var selected = document.getElementById("seletedItems").innerHTML;
if (selected.search(item) == -1) {
document.getElementById("seletedItems").innerHTML += item + ",";
}
else {
alert("item already selected");
}
}

and also an error is coming on to the line onchange="select();" stating that invalid attribute of dropdownlist...
ur code is not working plz help with some diff soln

Posted 31-Jul-10 4:45am

software_Engi08

Updated 2-Aug-10 6:02am

v2

Add a Solution

Comments

raju melveetilpurayil 31-Jul-10 10:59am

store selected item in any variables, check that variable in next selection

raju melveetilpurayil 3-Aug-10 15:52pm

my code did work. did you add div control?

raju melveetilpurayil 3-Aug-10 15:54pm

i gave working code. Just do copy paste, it will work fine.

raju melveetilpurayil 4-Aug-10 4:57am

and why you update this question with my answer?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

raju melveetilpurayil · Answer 1 · 2010-07-31T05:14:00

This will help you.

XML

<div id="seletedItems" style="display:none"></div>
   <asp:DropDownList ID="DropDownList1" runat="server" onchange="Select();">
   <asp:ListItem>Select</asp:ListItem>
       <asp:ListItem>1</asp:ListItem>
       <asp:ListItem>2</asp:ListItem>
       <asp:ListItem>3</asp:ListItem>
       <asp:ListItem>4</asp:ListItem>
       <asp:ListItem>5</asp:ListItem>
   </asp:DropDownList>
   <script type="text/javascript">
       function Select() {
           var item = document.getElementById("DropDownList1").value;
           if (item != "Select") {
               var selected = document.getElementById("seletedItems").innerHTML;
               if (selected.search(item) == -1) {
                   document.getElementById("seletedItems").innerHTML += item + ",";
               }
               else {
                   alert("item already selected");
               }
           }
       }
   </script>

Sandeep Mewara · Answer 2 · 2010-07-31T05:16:00

Solution 2

1. Maintain the selected item in a hidden variable. Maintain it using JavaScript. Next time on selection of it, show appropriate message or take appropriate step
2. On selecting the values, remove it from the dropdown using JavaScript such that they are no more selectable.

Try now!

Posted 31-Jul-10 5:16am

Sandeep Mewara