I have a .aspx page having two dropdowns, the data to be loaded in them is usually static(but may change everyday), the first dropdown always displays the main categories and the second dropdown is initially empty.
Now, the requirement is:
As the user selects a category from the first dropdownlist, the second dropdownlist should populate based on the selection just made.
The road-block:
This should be done without a postback. My boss wants something like the drop downs on this page.
So what I gather is, I'd have to retrieve the data from the database on page load event, store it in the cache(or somewhere else?), then use javascript to handle the selectedindexchanged event of the 1st dropdown, use the data from database stored at pageload and populate the second dropdown according to the selected value of first dropdown.
P.S.- I'm a beginner ASP.Net C# programmer and have no knowledge of Javascript.
I am having two dropdownlist in my project,one dropdownlist for empid, another dropdownlist for month, if the user select the empid, the values are retrieved in the textbox.
In the second dropdownlist, if the user select the month in the dropdownlist it will display the leave details, its all working fine, if the user again select the first dropdownlist that means empid, I want to show the second dropdownlist as select month, how can do this.....
I am making an application that deals with vehicles. I need two DropDownLists:
Makes: All Vehicle Makes Models: Models that belong to the selected value of the Make DropDownList
How is this done in MVC2? My Idea: Do I use an ajax call when my first list is selected and then pull back the Models to bind to the Model DDL? How would model binding come into play that way? UPDATE I posted what I ended up doing as an answer. It is super simple and works great. You can use a get too if you feel so inclined, but you have to specify that you want to like so... return Json(citiesList, JsonRequestBehavior.AllowGet);
A form contains 2 cascading dropdowns. When an item is selected in the first dropdown, jQuery retrieves a list (json) from the server and fills the 2nd dropdown.
The user posts the page to the server, and when the page is returned the dropdown is empty because its not stored in viewstate.
What do you do in this situation? Is this the point where cascading dropdowns using jQuery and trying to make your page a little more stateless gets tedious?
I have 3 Cascading dropdowns in a user control. After making a selection i want to clear the values of the selections or make it to select some values that I pass in. The ownCategoryValues does not get reset and everytime the service gets called the knowncategory values is the same.At what point should the knowncategoryvalues be changed to reset the dropdowns
I am new to ASP.NET MVC 2. In my project, there are two selects: one that contains a list of countries and another that should contain the states/provinces/etc for the country selected in the previous select.
Is there any possibility to create a cascading select without using any client scripting?
I am trying to use a solution for a cascading dropdownlist (the selection in one dropdownlist determines the options in the second one) found here:
[URL]
[code]...
how to get a default value for the dropdownlists. Since otherwise the customer dropdownlist will have a value when you first get to the page, but the task list won't...
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.
My application includes a gridview control with and Edit mode which allows users to do selections using cascading dropdownlist. My code is based on tutorial by Brian Orrell (link below). I am able to statically populate the dropdownlist but in my case I need to populate it dynamically based on a previous selection of a dropdownlist, I would like to do it programatically so I can manipulate data.
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)
i have a table with three columns as ID,baseid,name.
[code]...
i will display all baseid 0 values in first dropdownlist1
based on the selection corresponding values will be shown in dropdownlist2 (like when desc1 is selected desc1212 &desc2323 will be shown in dropdownlist2. now i want to edit/add details to the table from aspx page.
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)
let me know if some body tried to use a cascading dropdownlist inside a formview to be used in update and insert templates.known that my tables are like this:
Section: SecID SecTitle Category: [code]...
I need to create a formview to insert and update all my news but I need a cascading Dropdownlist to select a section and generate the related categories Note that I need to display the Sectoin and the Category Titles
I have 5 dropdown list (sector-country-year-project code-project title) so what i need is when i select specific sector for example education , the rest of the label should show me the only data related to the sector education in dropdown list. the same with other if i select year 2011 should show me in other dropdown list just the data related to year 2011.
i use cascading dropdown lists (in a user registration form) and when the user hits the submit button i get the error: "Invalid postback or callback argument" I've seen on the net that this is a problem dating back many years but still haven't found a solution to this. I've read about changing EnableEventValidation to false, but this poses a security risk.
I have three cascading dropdowns on my web page and they work fine. The issue I am facing is that there are other controls on the page which cause a postback and with each postback the cascading drop downs are being re-populated (service methods are called) which is becoming a performnace issue.
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.
