I have a form that saves and loads data from a database. Creating new forms is fine however when reloading hthe form for editing I want the CascadingDropDown control to have its previously selected value displayed.
I have tried the obvious such as loading the controls data and using SelectedValue = someId but it didn't work (probably not surprising!). I also tried setting the controls Text property incase Atlas detected a non empty value and left it alone. I had a bit of a look at the source but I don't yet know enough about the architecture to answer the question myself or to write some code.
Is there a way in this version of preselecting a value when setting up a form from server data on an initial page load?
Keep up the good work guys!
Regards,
Steven.
If you put the following code into the Page_Load for the CascadingDropDown.aspx, it will initialized the first item:
CascadingDropDown1.TargetProperties[0].ClientState ="BMW (value)";
Unfortunately you can't do this for other ones because the change of the first item to the specified value will clear the subsequent items, so we'll need to make improvements here.
But in general the idea is that you should be able to set the ClientState to be the string version of thevalue you want to set (not the text label).
Thinking more about this I think there's a few things we'll do in a future release (might not make our next refresh):
1) Add a strongly typed property for this e.g. "Selected" value
2) Try to make it so the value doesn't flash before the text gets set
3) Make sure you can do more than just the top level here.
Thanks for pointing this out, it's good feedback.
Thanks,
Shawn
So, am I to understand that currently values cannot be selected in dependent lists based on data that that was retrieved from a database?
When I user selects an item to edit, I populate the form with all the existing data for that item, however, some of my dependent lists are not getting the SelectedValue set.
I have an Account list (the parent), I am able to set its SelectedValue.
Sub-Account, Contact, Network and Gateway are dependent on Account. Gateway Version is dependent on Gateway.
When I populate my form the SelectedValue is set successfully for the following lists:
Account, Gateway, Gateway Version
The other lists are disabled and show the PromptText. This would be less confusing to me if ALL dependent lists were disabled with the prompt text selected.
Is there a way to make this work? Or do I need to abandon the CascadingDropDown and find another solution?
(My original post:http://forums.asp.net/thread/1383830.aspx)
It sounds like you have a 1:many parent:child relationship going on here. If so, then I think I fixed the problem withwork item 1704. Please trya recent development release and let us know if it's still not working.
(My app is a ticketing system)
I downloaded the Wed, 30 Aug 2006 17:53:43 GMT version and it solved my issue with the values of the "child" lists not getting selected when viewing/editing an existing ticket. However, now when I go to add a new ticket, my page hangs when it loads the CascadingDropDowns. My cursor becomes an hour glass and my browser becomes unresponsive. My lists never get populated, not even the "parent".
Eventually I get this error: "A script on this page is causing Internet Explorer to run slowly. If it continues to run, your computer may become unresponsive. Do you want to abort the script?"
I'll download a different development release while I wait for a response and see if that makes a difference.
(Side note: I was going to upload a screen shot of the error, but I don't have permission to perform uploads.)
It sounds like either you have a circular reference in your page - or CascadingDropDown is adding one. :) If nothing stands out for you, please post a simple sample so we can have a look. Thanks!
If I add the CascadingDropDownProperties like this (below) the "Add New Ticket" pages hangs on load. However, the "Edit Existing Ticket" page will load/populate just fine - including all of the "child" lists.
<atlasToolkit:CascadingDropDownID="CascadingDropDown1"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="AccountList"
Category="Account"
PromptText="-- Select Account --"
ServiceMethod="GetAccountList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="ExchangeList"
PromptText="-- Select Exchange --"
Category="Exchange"
ServiceMethod="GetExchangeList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown2"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="ContactList"
ParentControlID="AccountList"
PromptText="-- Select Contact --"
Category="Contact"
ServiceMethod="GetContactList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown3"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="SubAccountList"
ParentControlID="AccountList"
PromptText="-- Select Sub-Account --"
Category="SubAccount"
ServiceMethod="GetSubAccountList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown4"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="NetworkList"
ParentControlID="AccountList"
PromptText="-- Select Network --"
Category="Network"
ServiceMethod="GetNetworkList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown5"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="GatewayList"
ParentControlID="AccountList"
PromptText="-- Select Gateway --"
Category="Gateway"
ServiceMethod="GetGatewayList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown6"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="GatewayVersionList"
ParentControlID="GatewayList"
PromptText="-- Select Gateway Version --"
Category="GatewayVersion"
ServiceMethod="GetGatewayVersionList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
____________________________________________________________________________________________________
If I add the CascadingDropDownProperties like this (below) the "Add New Ticket" page loads just fine, however, the "Edit Existing Ticket" page doesn't populate the "child" lists properly - only Account, Gateway, and GatewayVersion have the correct values selected.
<atlasToolkit:CascadingDropDownID="CascadingDropDown1"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="AccountList"
Category="Account"
PromptText="-- Select Account --"
ServiceMethod="GetAccountList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="ExchangeList"
PromptText="-- Select Exchange --"
Category="Exchange"
ServiceMethod="GetExchangeList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="ContactList"
ParentControlID="AccountList"
PromptText="-- Select Contact --"
Category="Contact"
ServiceMethod="GetContactList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="SubAccountList"
ParentControlID="AccountList"
PromptText="-- Select Sub-Account --"
Category="SubAccount"
ServiceMethod="GetSubAccountList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="NetworkList"
ParentControlID="AccountList"
PromptText="-- Select Network --"
Category="Network"
ServiceMethod="GetNetworkList"
ServicePath="CascadingListService.asmx"/>
<atlasToolkit:CascadingDropDownProperties
TargetControlID="GatewayList"
ParentControlID="AccountList"
PromptText="-- Select Gateway --"
Category="Gateway"
ServiceMethod="GetGatewayList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
<atlasToolkit:CascadingDropDownID="CascadingDropDown3"runat="server">
<atlasToolkit:CascadingDropDownProperties
TargetControlID="GatewayVersionList"
ParentControlID="GatewayList"
PromptText="-- Select Gateway Version --"
Category="GatewayVersion"
ServiceMethod="GetGatewayVersionList"
ServicePath="CascadingListService.asmx"/>
</atlasToolkit:CascadingDropDown>
We'll probably need the corresponding web service (or one that returns close enough data to reproduce the problem), too, please. If this can be reproduced with the SampleWebSite's web service, a demonstration using that is also fine.
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