Web Forms :: Tell If Any Textboxes Or Dropdownlists Have Been Changed?

Mar 7, 2011

I have a form that can be used to input new records, or to review previously entered records... What is the best way to tell if any of the fields have been updated? I have a fairly sized relational DB and I hate to update every associated record in every table every time the update button is pressed. Is there possibly some way to tell on the server side or on the clientside via JavaScript?

This has to be a common problem with a good efficient solution.

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[Code]....

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[Code]....

[Code]....

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[Code]....

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[URL]

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[Code]....

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[Code]....

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[Code]....

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[Code]....

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[Code]....

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I have a FormView in InsertItem that contains one DropDownList linked to a Table Datasource to display ItemCodes. In that "lookup" table I also have a Retail and Cost field.When the user selects the item from the drop down, how can I have these to field carry over into my new record that is being inserted. The new record also has a Retail and Cost field that are TextBoxes.Basically I am populating the new fields with the default values from the DropDownList.

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I need to filter data in a View using three dropdownlists that are populated independently of one another. The items in the second ddl are not based on the items in the first, etc. Each ddl is populated using its own sql statement. I want to be able to use each of these dropdownlists independently of the other two, but I want the data that is returned to be based on the values already in the other dropdownlists when I make a selection change.

For example: DDL1 is populated with Horsepower values from its own SQL statement.

DDL2 is populated with Gallons per Minute from its own SQL statement, unrelated to what is chosen in DDL1.

DDL3 is populated with Diameter values from its own SQL statement, unrelated to either of the other DDLs.

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Forms Data Controls :: Filtering GridView Using Two DropDownLists?

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I want to filter my gridview using two parameters that come from Dropdownlists. I bind these drops with two linq queries and next I would like to filter my gridview with query that has two parameters that comes from selected values from those drops. Everything is inserted in UpdatePanel. Here is my code:

asp:UpdatePanel
ID="UpdatePanel1"
runat="server"
>

[Code]....

I don't know how to get selectedvalues from dropdownlist and pass them to Bind() function which binds grid view

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Forms Data Controls :: Large DropDownLists In GridView?

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I have a gridview that is currently showing 20 lines per page. Each line has several fields in it, three of which are dropdownlists. These dropdownlists are populated with a SQLDataSource and then the selected value is bound to one of the gridview datalements.

The problem I'm running into is that the page is very slow to load. I believe this is because of the large dropdownlists (and possibly because there are roughly 60 of them, each of which is executing a SQL query to populate the list of available values). The file size that is being transmitted over the web is just over 1.25MB in size, again from the large amounts of data in the dropdownlists.

Is anyone aware of a technique by which I could only execute the query from the SQLDataSources that populate the dropdownlists' available values once and then reuse the results of that query to populate the relevant dropdowns? Ideally I would do this on the client side so it would also limit the amount of text being transmitted to the client browser.

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Forms Data Controls :: DropDownLists With ControlParameters That Reference Each Other?

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I have two DropDownLists, and each one has a Control Parameter that references the other.

The idea is that if you select a value in either one of them, it restricts the possible values you can select in the other. And the user may select either one of them first.

Each one has an "All" option for selecting all values. (They are both used to restrict rows that populate a GridView).

This is all done using SQLDataSources.

The problem is that it doesn't seem to work at all. Both DropDownLists are empty, and the SQL that populates them never hits the SQL Server. But there is no error displayed.

If I have it going only one way, it does work, so I think the problem is the recursive nature of having them reference each other.

It would seem to be quite a common requirement, so its there any way of getting this to work?

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Forms Data Controls :: Gridview With Dropdownlists And Label

Jan 27, 2011

I have a gridview with 4 dropdownlists and 1 label in each row. Suppose , text fields of each dropdownlists are a,b,c and value fields are 1,2,3 respectively.

In each row,label text is the sum of value fields of selected text fields of 4 dropdownlist.

For example,If selected text of 4 dropdownlists of a row are-b,a,b,c.

Then the label text of that row will be 8.(value field of b=2,a=1,c=3 , so b+a+b+c=8)

Whenever the selected text of any dropdownlist changes,corresponding label field also will change.

How can we do this in asp.net with C#?

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Jul 28, 2010

I'm comfortable populating dropdownlists in a standard webform, but I seem to be having trouble populating them from within a gridview or listview.I know that I'll probably need to use the find control method, I've had a stab at it with the following:

[Code]....

The purpose of this is to allow someone to look at a bunch of records, and in a dropdownlist add an item to a group, but this "group" is in a separate table, so I want to take whatever value that select in the dropdown menu, lookup their user id, and add both bits of information to the other table, so it's technically not even editing, even though i suspect I'll need to use the edititem template?

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Forms Data Controls :: Cascading DropDownLists In DetailsView?

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Here is the case:

I use Visual Studio 2008 ASP.NET 3.5

I have a DetailsView control with several fields that is in insert mode. Three of them are the source of my problems and headaches.

I have three DropDownLists in template fields.

The first one is OK, bound to it's designated field in table1 in the database. The next two however have to change their bound tables according to the SelectedValue.

So far, I've managed to get it working, BUT when I insert the data I've entered, these two DropDownLists are not entered into the database.

DropDownList3 - the list that controls the other two DDLs

DropDownList4 and DropDownList5 - the list that need to change their items accordingly

DropDownList3 has six different values, so I have 6 tables for each of the other two DDLs

However I have only tried with one to see if it would work, that's why the Sub seems incomplete.

Here is the relevant part of the code:

[Code]....

And the DropDownList3_SelectedIndexChanged sub:

[Code]....

If I leave SelectedValue='<%# Bind("shelves") %>' and SelectedValue='<%# Bind("type") %>' in the <asp:DropDownList> tag of the two DDLs that change values, I get an error when the first one does the postback.

The error is:

Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. This error, I spent a whole day looking through forums and knowledge bases, but I could find nothing that solves my problem. Maybe the problem is me, but my boss wants this done, despite it is not my area of expertise to write code.

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