I have a page that has two drop down lists on it and a button. All controls sit in an update panel. The first drop down list (ddl1) contains a lot of values which caused a huge viewstate so I disabled viewstate on it. In the page oninit event I populate the drop down list every time the page is posted back. This all seems to work fine, it shows all the values and I can access the selected value in my event handler.
ddl1 has the autopostback attribute set to true so when its value changes the second drop down list (ddl2) is populated with some values that depend on the selection in ddl1. This also works fine, the values in ddl2 change when I select a value in ddl1.
ddl2 does not have viewstate disabled. The button that sits under my two drop down lists is disabled by default and becomes enabled when the value of ddl2 is changed to anything except string.empty. This is where I run into problems. ddl2 does an autopostback too but it seems to lose the selected index/value. When I'm in my code to check whether to enable or disable the button the selected index is always 0 and the selected value is string.Empty.
If I enable viewstate on ddl1 this all works fine. Could anyone point me to what I'm doing wrong?
Is it possible to make the viewstate false of whole page including all controls at a time.I mean I don't want to set enableviewstate="false" for all controls..In the page directive of the aspx page I have made enableviewstate="false" but still viewstate of all the controls of the is enabled.. And what the EnableViewState="False"actually works within Page directive.
I thought disabling ViewState for a server control would cause this control not to keep its state after a postback. I thought the same would happen if I disable ViewState for the whole page.
However, I tried to create an example to show this to a colleague and was puzzled when a textbox on a page would keep is state (in this case its Text property) after one or more postbacks, even when ViewState is disabled everywhere (both at Page level and Server Control level). Please see the code below:
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I can keep pressing the Post back! button and every value typed on the textbox is still there after the postback(s). I'm using VS 2008.
After this example I now assume I don't understand ViewState as I thought I was.
The sites I mantain are using way too much ViewState and I'd like to reduce that so the size of the page is reduced. I've done a lot to remedy this but I have an issue relating to DropDown lists that use AutoPostbacks.I have a dropdown list with a lot of list items and a good part of the ViewState usage is to hold the list item data. If I disable ViewState and set the AutoPostBack property to true, the page will post back and in the page load I am trying to repopulate the dropdown list with cached data. However, it seems that the SelectedIndexChanged event doesn't fire when EnableViewState="false".Is it possible to make this work without enabling ViewState for the drodown list?
I have a web page which is using PasswordRecovery control.Its working fine but I have a scenario in which I have to disable Viewstate for the whole application.Now after disabling viewstate when I visit the webpage I have noticed that PasswordRecovery controls is not working (Every times when I submit the default button to go to step 2, the postback occur but not moving to step 2).
I have a drop down list that has the initials of about 12 of our sales guys.How can I make it so that when they select their initials from the list, the next drop down list only shows their customers.In my database there is a column for customer name and salesman.
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
I am using a asp.net Drop down list control which is disabled using javascipt, when I am trying to retrieving the value server side the default value is being set on postback.
I have drop down list box that I would like to show two columns, is this possible? Or can it be done with a list box?The query correctly retrieves all of the table data to be displayed, one colum is an abbreviation, the other a bit longer description.
I have a requirement in my application that, while saving the application, need to get all the value from drop down list and pass it to the view model. But application should not allow the user to select more than one item from drop down list manually, ie, only one value at a time. My view model is like ...
public class ListManagement { public IEnumerable<selectListItem> InactiveProduct { get; set; } public string[] InactiveProductSelected { get; set; } public IEnumerable<selectListItem> ActiveProduct { get; set; } }
I have two drop down list on a page. The first one list projects and the second list users. The userlist is populated with an object datasourse that pulls a list of users for the selected Project.Whenever the Project list selection changes the second ddl Userlist always reverts to the first person in the list instead the person that was selected before a new Project was chosen.
I am trying to create an MVC List View that can be filtered by the value selected from a drop down list.
Selecting a value should repost the page ... Since there is no concept of view state data I am having some issues with this ... I can get the repost to take place but my drop down resets and I am not able to get the value that was selected.
ASSET CONTROLLER:
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I have tried many of the posts that refer to setting up drop down lists but can't set them up in the content because this is a List View.
I have a CheckBoxList (CBL) control inside a gridview. The CBL viewstate is enabled and I populate the CBL items from a session variable with the following code
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How can I maintain (save) the user CBL selection while postback ?
I stored a list<mytype> object in a viewstate. Type of list<mytype> comes from a public structure which is defined at page.
When I try to convert viewstate to a list<mytype> object it cause error.
Public struct mytype {....} Page_load() { list<mytype> obj = new list<mytype>(); viewstate["mystate"]=obj } My_function(){ list<mytype> tempobj = new list<mytype>(); tempobj = (list<mytype>)viewstate["mystate"];// this line cause error ! }
I am having an issue with dropdown list when viewstate is disabled. The selectedindexchanged event fires even for the other events on the page.
I am pasting the code bello. To reproduce the issues I am mentioning change the selected value of the dropdownlist and then click any button the selected indexchanged event fires even thought we didnot change the value.
I want to store List<Class> object to ViewState, when i try to do this than its giving me error to make class serialize,but my class is partial class so didn't get serialize keyword on class how can i store List object to viewstate.
I had ddl which in selected changed it execute some code but when i tried to do that it wasn't worked well WHEN i checked the reason i found that ddl in selected value =0 also i made all well and this is my code
protected void DDlProductFamily_SelectedIndexChanged(object sender, EventArgs e) { if (DDlProductFamily.DataValueField.Contains("ProductCategory_Id")) using (SqlConnection Con = Connection.GetConnection()) { SqlCommand Com = new SqlCommand("GetListViewByProductCategory", Con); Com.CommandType = CommandType.StoredProcedure; Com.Parameters.Add(Parameter.NewInt("@ProductCategory_Id", DDlProductFamily.SelectedValue.ToString())); SqlDataAdapter DA = new SqlDataAdapter(Com); DA.Fill(dt); DataList1.DataSource = dt; DataList1.DataBind(); } }
When the user navigates to a new page, this ddl's selected index is determined by a cookie, but if the ddl doesn't contain that cookie's value, then I'd like it to be set the 0. What method would I use for the ddl? Is a loop the best way, or is there a simply if statement I can perform?
This is what I've attempted, but it doesn't return a bool.
if ( !ddlCustomerNumber.Items.FindByText( GetCustomerNumberCookie().ToString() ) ) ddlCustomerNumber.SelectedIndex = 0;
