programatically adding cascading dropdowns with the ability to add to the dropdownlist

I'll keep this as simple as possible, apologies in advance. Cascading dropdowns (CCD) are added to a page programatically. Each cascade dropdown (CCD) is added in a while lop based on the number of levels read in from a db table. beside each dropdown (CCD) is an add button, which when clicked pops up a modal window, allowing the user to via an update panel add to each the cascading dropdown (CCD) of choice. My problem is this I want the button beside the dropdown only to become enabled when the cascading dropdown is active/populated. So when I draw everything in theOnInit function I make the buttons beside the cascading dropdowns disabled. My Question is how do I enable them based on the (CCD) becoming active? and secondly am I doing this the correct way. Code below: Thanks in advance

While counter < SR.Item("Annello")

Lit =New Literal

If counter < 1Then

Lit.Text ="Category"

Else

Lit.Text ="Sub-Category"

EndIf

UPanel.ContentTemplateContainer.Controls.Add(Lit)

DDL =New DropDownList

With DDL

.ID ="DropDown" & counter

.Width = 250

.DataTextField ="CategoryName"

.DataValueField ="CID"

EndWith

UPanel.ContentTemplateContainer.Controls.Add(DDL)

Cascade =New AjaxControlToolkit.CascadingDropDown

With Cascade

.ID ="Cas" & counter

.TargetControlID = DDL.ID

If counter > 0Then

.ParentControlID ="DropDown" & counter - 1

.PromptText ="Please select a Sub-Category"

Else

.PromptText ="Please select a Category"

EndIf

.LoadingText ="Loading.."

.Category = counter

.ServiceMethod ="GetCategoriesPageMethod"

EndWith

UPanel.ContentTemplateContainer.Controls.Add(Cascade)

IB =New ButtonWith IB

.ID ="ADD" & counter

.Text ="add to.."

EndWith

UPanel.ContentTemplateContainer.Controls.Add(IB)

IB.Enabled =False

'''MODAL POPUP

NPanel =New Panel

With NPanel

.Style.Add(HtmlTextWriterStyle.Display,"none")

.Style.Add(HtmlTextWriterStyle.Height,"200px")

.Style.Add(HtmlTextWriterStyle.Width,"350px")

.Style.Add(HtmlTextWriterStyle.BackgroundColor,"#ffffff")

.Style.Add(HtmlTextWriterStyle.Padding,"10px")

.ID ="NPanel" & counter

EndWith

Lit =New Literal

Lit.Text ="Enter Your Category here "

NPanel.Controls.Add(Lit)

TBX =New TextBox

With TBX

.ID ="AddTBX" & counter

.Width =New System.Web.UI.WebControls.Unit(190)

EndWith

NPanel.Controls.Add(TBX)

IB =New ButtonWith IB

.ID ="OK" & counter

.Text ="OK"

'.Attributes.Add("onclick", "InsertCategory();")

EndWith

NPanel.Controls.Add(IB)

IB2 =New Button

With IB2

.ID ="Cancel" & counter

.Text ="Cancel"

EndWith

NPanel.Controls.Add(IB2)

UPanel.ContentTemplateContainer.Controls.Add(NPanel)

MP =New AjaxControlToolkit.ModalPopupExtender

With MP

.TargetControlID ="ADD" & counter

.PopupControlID ="NPanel" & counter

.OkControlID ="OK" & counter

.CancelControlID ="Cancel" & counter

.OnOkScript ="InsertNewCategory()"

.OnCancelScript ="alert('cancel');"

'.OnOkScript = "alert('OK');"

.DropShadow =False

.BackgroundCssClass ="ModalPopupBackground"

EndWith

UPanel.ContentTemplateContainer.Controls.Add(MP)

Hi

Try this,It works:

<td><asp:DropDownList ID="DropDown1" onchange="javascript:activeBtn(this)" runat="server" Width="170" /></td>

<script type='text/javascript'>
function activeBtn(ccd)
{
var strcounter = ccd.id.substring(ccd.id.indexOf("DropDown") + 8, ccd.length - 1);
var counter = parseInt(strcounter);
var theBtn = document.getElementById(ccd.id.replace("DropDown", "ADD").replace(strcounter, (counter + 1) + ""))
if(theBtn){
if(ccd.selectedIndex != 0)theBtn.disable = false;
else theBtn.disable = true;
}
}
</script>

You can add the onchange event handlers for your DropDownLists in code-behind by using this code:

DDL =New DropDownList

With DDL

.ID ="DropDown" & counter

.Width = 250

.DataTextField ="CategoryName"

.DataValueField ="CID"

.Attributes.Add("onchange", "javascript:activeBtn(this);")

EndWith

Best Regards

Gave that a go and couldn't get it to work. I see what your doing and I'm hitting the function and even if I hardcode the Button.ID to enable that one button it doesn't work, no errors but it just won't enable it... any ideas. Thanks in advance..

Hi

Sound odd,I have test it many times.I'm sure it works.

Would you please privide us with a whole demo?

Thanks

ThanksJin-Yu Yin

Firstly thanks for you help. It is strange that it doesn't work, the funny thing is if I change you function to the following it works, but I'd never have gotten there without your help. Again many thanks.

function activeBtn(ccd)

{

var strcounter = ccd.id.substring(ccd.id.indexOf("DropDown") + 8, ccd.length - 1);

var counter = parseInt(strcounter);

var theBtn = document.getElementById(ccd.id.replace("DropDown","ADD").replace(strcounter, (counter + 1) +""))

if(theBtn){

if(ccd.selectedIndex != 0)

{

if (theBtn.disabled) {theBtn.disabled =false;}else theBtn.disabled =true;

}

}

}

Hi

Glad to hear that it works now.I'm sorry for misunderstanding any logic of it.

Best Regards

Like I said mate, thanks ,u were 100% bang on. Appreciate the help.