Forms Data Controls :: Why Dropdowns On Page Are Not Displaying
Nov 22, 2010
I've been trying to figure out the issue and knowone seemd to know. I put a dropdown on my page and when I view it from my server, it works fine. When I tell it to go and get it's values from a DB I can no longer see it on the page when I view it from the server. Here's the code I have for it:
<td
class="style28">
<asp:DropDownList
ID="DropDownList2"
runat="server"
DataSourceID="AccessDataSource1"
DataTextField="Team"
DataValueField="ID">
</asp:DropDownList>
<asp:GridView
ID="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="ID"
DataSourceID="AccessDataSource1"
EmptyDataText="There are no data records to display."
Visible="False">
<Columns>
<asp:BoundField
DataField="ID"
HeaderText="ID"
ReadOnly="True"
SortExpression="ID"
/>
<asp:BoundField
DataField="Team"
HeaderText="Team"
SortExpression="Team"
/>
</Columns>
</asp:GridView>
<asp:AccessDataSource
ID="AccessDataSource1"
runat="server"
DataFile="App_DataIRISBS.mdb"
SelectCommand="SELECT [ID], [Team] FROM [tblTeam]"></asp:AccessDataSource>
</td>
I am using panel to hide and display certain controls on a page, On one of my panel i have three drop down, all i want is to make sure that user has selected something from the dropdowns otherwise they cant proceed, i am using the requiredfield validator but its just not working
I got a web app linked to a SQL Server 2005. The registration page for learners on this page require a lot of information and many of them are on dropdown controls linked each to their own table adapter. The table adapters are linked to tables within the Database. The dropdowns consist of info like designations, grades, categories, race, etc. The tables like designations changes from day to day as new types of designations are added and the other removed. What will the best way be to add data to the dropdowns? Another way I considered are to have one table and add a field like a type field that distinguish between the dropdown so that I only use one table adapter, or are there a better way. Some Code:
I have two dropdowns menu in detailsview (Both one table) . I want to change items in the second dropdown when the user selects an item in the first dropdown.
What I did as following but it does not work :
Add an empty SelectedIndexChanged event on the first dropdown and then, bind the second to the first under Selectedvalue. Also, sat AutoPostBack="True" on first dropdown.
I have three parameters to search and the record is being populated on the gridview.
Paremeters are dropdown lists:
lstDepartment, lstSection, lstLocation
I used AutoPostBack to true for above dropdowns but the problem I am facing is when I select value in lstDepartment to show values in lstSection then gridview data refreshes and after that when I select lstSection to show values in lstLocation then again gridview refreshes.
What I want to do is to when I'll select dropdown one by one then gridivew display data when a Search button pressed.
I don't want to refresh gridview everytime on the basis of dropdown selection.
I have a gridview populated by a SQLDataSource that is fairly complicated on a dataset changing constantly. It takes a second or so to fetch the data.
I want to have external dropdownlists for filtering the data that appears in the gridview, either with a FilterExpression or with parameters.
The problem is that querying the database to populate the dropdownlists takes a long time, because of the complexity of the query. The values in the dropdowns can vary based on other filters.
Is there some simple way of querying the database only once, for the main gridview, and then somehow querying the local (to ASP.NET) copy of the data to extract distinct values for populating the filtering dropdowns? I am thinking this might speed things up a bit.
I have 45 dropdown lists in my asp page. There are some methods that I can apply to all of these dropdowns. Is it possible to convert them into an array of dropdowns for ease of use?
So I am using a formview that gets in Update mode with a bunch of values from a sqldatasource --- but I want to fill a couple dropdowns with data from the database --- but I cannot figure out how to bind the data to the dropdown box FIRST and then select the value in that dropdown box... but I keep getting an error that the Selected value is not a part of the dropdown (I assume because the sqldatasource is trying to bind BEFORE I can get the dropdown box bound).
IE -- when I load my values, lets say a 'Crop' comes back as 'Corn' ... I want to download the available crops from the database (ie. corn, beans, wheat, okra, etc.) and then set the selected value as CORN.... SO HOW do I get the dropdown filled BEFORE I try and bind the selected value?
i've 4 similar dropdowns in my form in four different categories, is there any way to bind one of them so that the remaining dropdowns can be automatically filled or binded with the same content as first dropdown
I want in my datapager to have something like displaying (page x of xx). I have done a research and I found this code which in C#.
[Code]....
But the problem is, my site is using VB as the code behind and I don't know how to convert it to VB code.I have tried using [URL] but it does not work.
I am working with a formview edititemtemplate. Currently in my page load, i have some stuff that would show or hide certain panels based on dropdownlist values. These dropdown values get binded during page load. I need to be able to change the values/dropdowns, without rebinding the old data, and updating the visibility of the panels based on predefined rules.
I have experimented with putting my formview.databind() in page load if isnotpostback, in prerender, in prerender if isnotpostback. I have tried my rules (ex if ddlState.selectedvalue = "DE" then pnlDelaware.visible = "true") in the page load, and the page render. I'm just not sure how to get the stars aligned here. The closest i have come is having the databind in the pageload if notispostback, and the rules in the prerender. However I get an error "dropdownlist has a SelectedValue which is invalid because it does not exist in the list of items.
As I understand the "gridview" control has a select link that can be enabled, I am fairly new to web development but what I was hoping to do was to click on the select link and then have the record that I have selected display on a seperate webpage. Is this relatively easy to do? Can anyone point me in the right direction?
I have a page with a data repeater. Each row has a dropdownlist for the user to select a value and the values in every dropdown are the same. I also have an SqlDataSource which each dropdownlist gets its values from as its created. Everything is working as it should but for each dropdown that is rendered a seperate call is made to the database.
suggest a better way for me to do this that means only one call to the database for all dropdowns rendered?
I'm a complete novice in .NET. I am trying to implement a multi textbox / dropdowns / checkboxes search for a website using vb.net. How do I pass the values of my form fields to my griedview and display the search result on the same page?
I've written a stored procedure and specified it as data source for my gridview and defined parameter source as my CONTROLS (textboxes, checkboxes n dropdowns) on the form. What I want is when a user fills out one or multiple fields on the form, how do I display data in the gridview on the click of SEARCH button? Also is it necessary to write a codebehind for my search button or we can achieve the desired result in some other way?
I have figured out how to programmically hide a dropdown on same page and on a different page using a Session when the Dropdownbox im using has a static drop down list. I am, however, having issues with a dropdown that is data bound to a DB for the dropdown list.I have gone over the code many times and that seems to be where my issue lies.
Here is where i set the selected item to a session on one .CS page:
I am working on a project, and I wish to use a master page. I want to experiment with it first. I add a master page; then, I add a default page. I copy some text and paste it in the default page, and I type this is the master page on the master page. When I run the project, the text in the default page always appear on top. How do I get the data on the default page to display to the right of the page, and the text on the master page to appear to the left.
Also, I tried it using menu. I got the same result. The menu was on the master page, but it was displayed at the bottom of the default's page text. I added three pages and was able to naviage between the pages. When I navigated to the second page without text, the menu appeared on the left. I added some text to the second page, and it does the same.
I am using cascading dropdown list where the no of dropdowns is created dynamically on the page. The cascading drop downs are contained in a User Control. I need to call a method from the Parent page which will be executed when the values in one of the dropdowns change. The server side event is not firing as I have set AutoPostback property for the dropdownlists to be false. How can i make the Page event fired from the Selected index changed of the dropdowns keeping the autopostback property to be set as false.
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've been working on my first version of an ASP.NET app, using cascading dropdowns. I've got 2 dropdowns on a page.
However, the third major control on the page is a details view. It works fantastic, with the cascading dropdowns, to display information from the second dropdown, and allow the user to edit that data. All well and good. But now, in testing, I suddenly realized that I've got no way of displaying the details view if I want to let the user enter new data, which would show some information in the second drop down.
I have a dropdown on an ASP page where user can select a product, I then want them to be redirected to a new page displaying the information to the chosen product. What is the easiest way I can do this?
I have a small problem with a querystring that populates 4 dropdowns.
On page A I have a hyperlink that adds 4 values to my url and on page B I have 4 dropdowns. I am able to click the link and the dropdowns are populated with the correct data! My problem is I do not know how to fire the postback event from DDL4 that shows my data!
[Code]....
My Sql statement:
[Code]....
As you can see from my code there are 2 control parameters. When DDLPrice is selected my page shows all the data. But when I use the querystring method it does not.
