AJAX :: Cascading Dropdownlist / Unable To Populate
Mar 2, 2011
I am trying to get two cascading dropdownlist to work but cannot get either to populate. How do I de-bug this? I'm not getting any errors, just blank dropdowns.
I've been trying to fill in webservice from SQL Server. But in-case this was the problem. I found an example on this site to fill with test values, but this still does not work. Since I cannot even get first to populate, to simplify I'm just giving code for first dropdown and its function(s)
Using four dropdown lists (country, state, city, pincode) in one table. i want to select one after other like based upon the country, states has to be displayed and based upon the states, cities has to be displayed and based upon the cities , pincode has to display.
I want to populate the cascading Dropdown values without Promttext.
Scenario is .If a single value is retrived from the database then I think no need to populate the promt text. It may populate only that value and call the next function from the inside of it. Can it be possible using web methods.
This line i get an error. Means nothing is populating there and no method is calling in .cs page too.in the script it returns error. my .cs page code for populting first dropdown as follows, [Code]....
Am using masterpages.I have written following code to add rows to dynamictable with html controls. I need to load data from database in cascading dropdownlists(like country,state);this javascript code is not accepting asp controls.can we load data in cascading html dropdowns? using javascript/AJAX?
I am referring to following line from this link [URL] ....
data 'continentId ' 'ddlContinents.ClientID'.val ''
In your code. i tried using this code and facing a tiny problem. In above mentioned code 'ddlContinents.ClientID'.val stores integer value in contentId for obvious reasons but the requirement of my code is different. i want to pass text which is selected instead of id no.for example if mumbai is listed as second option and i select mumbai it should store mumbai in contentId instead of 2 i.e. integer value.
I am trying to select some data with dropdown lists which are related.
I select one of selection in dropdownlist1. After that, when my page reloads, dropdownlist2 is filled with table name which i am trying to get data from. (TBLYETKILI)
I think this needs to be a sticky since this is not solved anywhere that I have been looking... I have been googling this for a while now and came across the answer by shear luck and a simple typo when I was writing the code...
Problem: I have 2 dropdown lists...
ddllist1 and ddlist2... Both are code-behind populated via a sql DB.
they are cascading lists via the ajax control.
I am trying to dynamically populate them with values from a DB for edit reasons.
When I try to get them populated I kept getting the error...
"dropdownlist has a SelectedValue which is invalid because it does not exist in the list of items"
Solution:
1) get the values from the DB or from where ever...
2) create a sql select to get the values from the ddl db
3) set the ID of the first DDL control to cddcontrol1.SelectedValue = id (this is a number)
4) set the value of the DDL to the string value ddlist2.SelectedValue = value (this is a string)
I am dealing with a problem that i have to make decision based on the number of items in a cascading dropdownlist. unfortunately this ajax toolkit control does not expose a Items collection.how do i count the number of items in this control ?
I'm wanting to maintain the dropdownlist values that were selected when i use postbackurl with a button. They cascading dropdowns are on a masterpage in an accordion pane. I select the 3 vales in the ddl and then presss a button which redirects to the new content page.
I've been able to get the values using previousPage.master.fincontrol... but am then setting the selectedValue in the page_init of the conent page, but they aren't set when the page loads... does anyone know where to put the code to set the values?
Now i'm working on the cascading dropdownlist for to bind a country and city, city is based on country dropdownlist. its working well , if city comes more than 8000 records in city dropdownlist , takes more to bind city.
I really have no idea on this problem on the cascading dropdownlist. I have a cascading dropdownlist that bind with calling the web services.
I wan to do a autopostback to get the value of the Album GUId so that i can query out all the photo list of that album. it is working well if my page without the AlbumGUId query string.
my problem is:
when i redirect from other page and passing the Album GUId querystring to this page, it will display all my photo for this album guid. but when i change the album to Select which should be able to display all the Photos, it cannot display out. It only will work is when i choose another album and then go back to Select then it only can work..
I'd like to set the selected value of cascading dropdownlist by reading from a Textbox.Text value when the dropdownlist has been populated, is this possible?
at last project i need to deploy cascading dropdownlist without using web serive or cascadingDropDownList Extender
i try to do this using updatepanel :D this work , but at many times that apear my computer and my internet Explorer as busy and hang and i can not do any thing untill populate the second dropdownlist :(
is there any way to avoid that and to view a wait message until populate the second dropdownlist , i mean is there a sample code for doing that
I have two dropdownlist in cascading working, in my file file.aspx, all work good.the selected values from cascading dropdownlist bind my repeater. when select item inside repeater redirect me to second.aspx. when comeback to first.aspx i lose all selected values in cascading dropddowlist and also values in repeater.
i can populate cascading dropdownlist by using webservice now. but may i know how do i trigger function while selectedindex changed? (without using auto postback...)
district region city Id can 1 Canada 1 Lon 1 London 2 Ita 2 Canada 3
Now when I select city from DDlcity after that select region from DDlregion according to my selected item from DDlcity and DDlregion it bind DDlDistrict... before I used OnselectedIndexChange below is SP...
ALTER procedure [dbo].[SelectِDistrict] @Region NVARCHAR(30), @city NVARCHAR(40)
[Code] ....
It worked correctly but now I use cascadingdropdown list
[WebMethod] public CascadingDropDownNameValue[] GetDistrict(string knownCategoryValues) { string region = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues)["Region"]; string query = string.Format("SELECT District FROM District WHERE Region = N'{0}'", region);
[Code] ....
problem is that when I select city=canada then region=1 I want it bind in DDldistrict =can but here it show in DDLdistrict can and Lon
here it just select district that region=1 it doesn't attention to city selected Item I want it do like SP that I used...
