Selecting a value of ASP:DropDownList to concatenate with another String in a textbox

Hi all. I need help about this particular aspect.

In a webform I have an <asp:textbox> (txtName) and <asp:DropDownList> (lstSchool) with 2 values inside.

I have typed in a value for the textbox. When I select an option from the dropdownlist, I would like that value(String) to be concatenated with the textbox's value. How do I achieve this in JavaScript?
(Microsoft Visual Studio 2005)

Any help/advice appreciated. Thanks.

Jan 8 '09 #1

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3537

pronerd

392

Expert 256MB

@uicouic

Expand|Select|Wrap|Line Numbers

  
<html>

    <body><br /><br />
 
        <select onchange="concatInput()" id="dropDownMenu" >

            <option value="1" >1</option>

            <option value="2" >2</option>

            <option value="3" >3</option>

        </select>
 
        <br /><br />        
 
        <input type="text" id="feildInput" />
 
        <script>

           function concatInput() {
 
                var fieldOne = document.getElementById('dropDownMenu');

                var fieldTwo = document.getElementById('feildInput');

                var conCatinatedVal = fieldOne[fieldOne.selectedIndex].value  + fieldTwo.value;
 
                alert('  New Contactinated String : '+conCatinatedVal);
 
            }

        </script>

    </body>

</html>

Jan 9 '09 #2

uicouic

I appreciate your response but Im not sure what you mean by that, since Im not using HTML tags for the dropdownlist, Im using <asp:DropDownList> instead. Could you advise me on how to modify the above code? Thanks.

Jan 14 '09 #3

acoder

16,027

Expert Mod 8TB

If you check the source of the generated code, you will see that it's converted to HTML.

Jan 14 '09 #4

uicouic

Bummer I can't get it work. :(
Do I need to assign an attribute to the DropDownList so I can call the function? e.g.

Expand|Select|Wrap|Line Numbers

lstBox.attributes.add("onchange","concatInput( )")

or is there another way going about it?

Please advise, thanks.

Jan 15 '09 #5

acoder

16,027

Expert Mod 8TB

Yes, that seems to be the way. If you still have problems with it, try asking in the ASP.NET forum.

Jan 15 '09 #6

uicouic

Ok I'll do just that.

Thanks acoder. :)

Jan 16 '09 #7

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