Web Forms :: Cascading Drop Down Lists From Single Table?
Oct 5, 2010
my one table consists of fields (id, flying from, flying to). thus i have one drop down for flying from and another drop down for flying to. i'm hoping to cascade them so 2nd drop down values are dependant on the values from 1st drop down. is it possible to do this using a single table? or must i use two tables and link the id's from both? and do i write anyting in the SelectedIndexChange event? the sqldatasource code looks like this:Flying From:
<asp:DropDownList ID="ddlFlyingFrom" runat="server" DataSourceID="SqlDataSource1"
DataTextField="FlyingFrom" DataValueField="Id" AutoPostBack="True" OnSelectedIndexChanged="ddlFlyingFrom_SelectedIndexChanged">
[code]...
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Mar 12, 2010
How can I have 2 Cascading Drop Down Lists for the same Drop Down List?here is my problemi have 3 drop down lists read from database1- Schools List 2- Classes List3- Teachers ListEvery School will have more than 1 Class and more than 1 TeacherWhat I want is when user select a School from Schools Drop Down List then BOTH (Classes and Teachers) should be refreshed based on the School Drop Down List
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Mar 17, 2010
I am using the AJAX Cascading drop down list but want to add event validation e.g. the compare validators.
As the cascading drop down list requires the page event validation to be disabled what is the best way to do the validation?
Validation Attempt: I have tried to use a custom validator which calls a Javascript function but it doesnt seem to be picking up the control. I get the following error Microsoft JScript runtime error: Object required
function ValidateCostCentCat(source, arguments)
{
var countryList = document.getElementById("ddlCategory");
if (null != countryList)
{
var iValue = countryList.options[countryList.selectedIndex].value;
if (iValue == "Select Category")
{
arguments.IsValid = true;
}
else
{
arguments.IsValid = false;
}
}
}
The mark-up for the custom validator is
<asp:CustomValidator ID="valcustCategory" runat="server" CssClass="error" Display="Dynamic" ValidationGroup="DirectHire" ClientValidationFunction="ValidateCostCentCat"
ErrorMessage="Please select a Cost Centre Category from the drop down list provided.">!</asp:CustomValidator>
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Aug 20, 2010
I am new to Ajax in general but I have a series of cascading drop down lists that are working fine. I'm using them on a form that I want to be able to either add a new row of data to the database or edit an existing one. I have the insert a new row working but editing an existing one is a bit trickier. The drop down lists are only part of the form but I would like to be able to query for a row id and set their values. Right now I'm querying for a row of data and populating the form with its values on page load and all of the fields work except for the drop down lists. I assume that this is because when the page is loading the web methods haven't run yet to populate the cascading drop downs. Therefore I can't set the selected value because there aren't any values yet. So therefore I'm pretty sure I need to do this from a web method so that it runs after the lists are populated or while the lists are populating but I don't know how.
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Aug 4, 2010
i am using SQL table to cascading 3 drop down list. this is search fields for cars by manifacture, model and year. the 2 first ddl has autopostback and AppendDataBoundItems (true) i want the user will select the facture first, then the 2th ddl will display the models of that manifacture and then the year. for the first time its working good, but when i change the manifacture for the second time, in the model i have the new values + the old values, and go on and on, if i select diffrent facture the model ddl have now values of 3 diffrent manifacture,
[Code]....
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Jul 6, 2010
I don't want to link my dropdownlists with a database like most of tutorials and forums show. I just want to link 2 dropdownlists, for instance if one says "Food" I want to show only the food producs in the other DropDownList. All this items are not from a database, I just inserted them in the DropDownList control.
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Jul 14, 2010
I have 3 dropdown lists. All 3 are using the same generic list for there items. I am using C# as the code behind. The code below shows the DTO list i am using and how I'm adding them to the drop downs...
[Code]....
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Apr 28, 2010
I need to validate ajax cascading dropdown lists. See code below. It does not work. Could anyone help on it. I use VS 2008.
<asp:DropDownList
ID="ddlTest"
runat="server" Width="131px"></asp:DropDownList>
[code]...
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Mar 22, 2011
I have a page that has a data grid and about 25 drop down lists.The datagrid displays Name and has an id col not visible. I was thinking that whan the user selects the select link button on the grid to then get all the data for all the ddl and populate the list and select the value or multiple values for that specific name that was selected. Thinking of it seems more like i should populate all the ddl and when a grid name is selected only get the keys for that specifc record and then mark the ddl items per that name. there are lots of ddl and lots of data, im not really sure the best way to proced. Any ideas appreciated.
I have a table with id typeId and Name that contains all of the data for the drop down list (different types of service providers , (plumbers, elec)I was thinking of selecting everything from that table and then in the page applying a filter by service provider type and using that to populate the ddls.
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Jan 12, 2010
I have 40 Drop Down Lists that I want to fill using an XML file. Based on what is in the XML file i will add an item to a specific Drop down list. I don't want to manually loop thorugh each control by name. the ids for all of the controls start with DDLSession and then they have a suffix such as A2 or B4. What I want to do in the C# Code is ads items dynamically to the control like this:
[Code]....
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Aug 25, 2010
I'm using VWD with a database back end. I have a list of teams which are marked off by league, level, division, teamid and then using gridview for the list of players per teams.I've got the drop downs working correctly but running into a little snag and that is on the auto postback.When I only have one option come up in a list, i obviously don't change that list and thus it doesn't change the next drop down because there is no post back. is there a way to use a "header" value?
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Oct 5, 2010
using below code, I bind 2 drop down lists.
[Code]....
And using the below code, I pass the content of a cell of GridView selectedRow to those DopDownLists .
[Code]....
But there is an error when I try to change the selected value of ddlCity (Detail)...What shall I do ?
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Aug 9, 2010
I am using C#, Object Data Source, formview and a BLL. I have two drop down lists and two data sources. One populates the other. Drop down list #1 populates Drop Down list # 2 based on its selection . Drop down list # 1 is populated with DataSource #1. Forview is using DataSource #3 to send the ietms. When I add: SelectedValue='<%#Bind("Make_ID") %>', I get the error below:
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control
I have seen a solution online but it is using LINQ and I am not familiar with it. I need to find the selected value of the drop down lists.
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Apr 15, 2010
I am trying to use a cascading drop-down for data entry. However, I'm having problems because I need to set the value of the drop-downs when I load the screen. I use a stored procedure to retrieve the values from my database, and then set the drop downs in my code-behind. Then the web service kicks in and wipes them out. :( How can I set these values and utilize the cascading drop down control?
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Sep 27, 2010
I've been trying to get this to work for weeks. I am trying to use a cascading drop down to populate drop down lists. The service method is working as i'm able to view the data in the browser but when i run the application the drop down list is empty. see below for the service method.
[Code]....
The code for the drop down list:
Location Name:<asp:DropDownList ID="DropDownList3" runat="server">
</asp:DropDownList>
<asp:CascadingDropDown ID="CascadingDropDown1" runat="server"
Category="Locations"
TargetControlID="Dropdownlist3"
PromptText="[Select Location]"
ServicePath="~/LocationWebService.asmx"
ServiceMethod="GetLocation"
EmptyText="Nothing">
</asp:CascadingDropDown>
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Dec 8, 2010
I have a model with a LOT of foreign keys. Right now, I'm populating view data:
ViewData["fieldname"]=new selectlist(entityframeworkmodel.foreigntable.ToList(),"fieldkey","valuefield");
I really don't like this approach. For one thing, I'm supposed to just name the field the same thing and trust that it will get stored in the model. I don't really understand how that works but it's a little worrisome.
Secondly, my code is now a bit of a mess.
//Address drop downs
ViewData["AddressType"] = new SelectList(ent.tblAddressTypes.ToList(), "AddressID", "AddressType");
//Contact Drop Downs
ViewData["ContactTitle"] = new SelectList(ent.tblContactTitles.ToList(), "ContactTitleID", "Title");
//Event
[Code]...
The other issue is I don't see how I can test this. I've written a repository method that just maps the id values from the drop downs into the respective EF objects.
How are other people dealing with this? I do set up these drop downs in a few places, so I thought about putting them in a controller method.
P.S. Kind of thinking about this: [URL]
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Jul 22, 2010
SELECT MenuItemID, MenuItemType, ItemName, PizzaToppings, Description, GraphicFileName FROM MenuItems
WHERE (MenuItemType = @MenuItemType) AND (ItemName = CASE WHEN @ItemName = - 1 THEN ItemName ELSE @ItemName END)I have created 2 drop-down box and a search button to display all records when one drop-down box is set to 'All"In the web-form I have set one of the drop-down box to value = -1 and appenddatabounditems to true.In the SQL I have typed the above but it does not work? Any one have an idea how this could be achieved with SQL?Essentially retrieving all records with the 'all' value selected.
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Mar 29, 2010
I am sorry if this has been asked before. I could not really find anything on it. What I need to do is to create a library of custom drop down lists that I can just in many different projects. I am not really sure how to get started on this or where to look. An example of some of the lists I need are: states, gender, marital status.
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May 14, 2010
I am creating a cascading drop down control for use with some drop down lists. They are filled using datasets which connect to a MS Access database. The first dataset was no problem however now I need to create the second which contains a where clause using a passed parameter (ie the selected value from the first drop down). In examples I have seen on the web the @ symbol is used eg WHERE fubar = @varname
When I try to execute this in the query builder in VS2008 I get two errors:
Error in WHERE clause near '@'. Unable to parse query text.
Followed by:
Executed SQL Statement: SELECT DISTINCT tbl_frame.frame_name, tbl_product.frame, tbl_product.model
FROM (tbl_product INNER JOIN
tbl_frame ON tbl_product.frame = tbl_frame.frame_id)
WHERE(tbl_product.model = @model)
Error Source: Microsoft JET Database Engine
Error Message: No value given for one or more required parameters.
It never promts for a variable. If I change the query to be something like WHERE tbl_product.model = 7 it works.
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Feb 19, 2011
I have a gridview which can be filtered from one or more values in a querystring. That all works great: e.g. "?subject=Maths&authorName=Bond_James&type=Magazine"
The values passed to the query string come from 3 drop down lists: Subject, Author, Type. What I'd like is when the user presses "Filter" it will take the selected values from the drop down lists and pass them to the querystring - it could be 1 value, 2, or all 3 (like above).
The drop down lists have an item called "All Subjects" / "All Author" / "All Type" each with a value of -1. The idea being that if the user leaves these items selected then the Filter button just ignores them.
Here is my code so far:
[Code]....
Also, one more thing. How do I get the drop down lists to have the filters selected when the page re loads?
EDIT: I changed the default values of the drop down lists to "" - this leaves the URL looking messy though ?author=&subject=&type= This works, is it the best way?
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Jan 8, 2010
I am trying to understand how best to organize some common Dropdown lists used in several views (some are cascading)
Is it best to create a single ModelsCommonQueries then create a webservice for each dropdown used in cascading situation then have a single controller that contains actions for each dropdowns
This way I can follow DRY principle and not repeat the dropdown logics since they are used in various views.
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Jun 3, 2010
I have a simple app I am messing around with its a basic Master/Details layout. The details panel is actually a tab panel and on one of the tab panels it has a GridView. Within that grid view it shows the "current" in database information with all cells as read only. I then have an add button that inserts a row into the GriView and allows the user to enter some information. The first item in my GridView is a DropDownList, which is populated from an ObjectDataSource. This drop down is basically my unique index and there can only be one selected value per GridView.
What is the best way to remove the values from the list that are already in the GridView? Do I just need to remove the data source and add a OnDataBinding method that iterates through the grid view and generates a valid list of values? I can't use a service method because if the user adds two rows they would have the option to insert duplicates description types.
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Mar 11, 2010
I have got 2 Drop Down Lists on my Form and 1 GridView. I want GridView to display the data according to selection from the Drop Down Lists. For Example, One Drop Down List contains Names and other contains Dates. Both the Drop Down Lists can post back. So if i select a name from 1st Drop Down list, the Grid View should show all the results according to that Name. Similarly if i select the Date from the other Drop Down List , the Grid View should show the results according to the dates. But i cant figure out as how to bind Grid View to respond to 2 Drop Down List. BTW i am binding both the Drop Down Lists and the Grid View to the DataSource Objects, which is getting data from the database.
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May 13, 2010
was having some trouble setting up databound cascasding dropdownlists. As a workaround I decided to go down the route of placing three standard dropdownlists in an updatepanel - I cant find any info to help to do this.Can anyone help with what I need??? I need three dependant dropdown lists to refresh after selection of the parent one without refreshing the whole page. Im using VS2005 .net 2.0 and I have installed the ajax toolkit.
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Mar 22, 2010
how do i create a cascading drop-down list without using ajax controls...i am using queries and the language i am using is C# I have a client and a project database....when i choose a client name in the dropdownlist....only the project names associated with that client should appear in the next dropdownlist
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