Required Validator disappears after autopostback set to true of a dropdownlist

My dropdownlist having data from database added with the following item:

DropDownList.Items.Insert(0, new ListItem("Please select", "0"));

My dropdownlist is inside of updatepanel. The autopostback=true is required.

The code is like following:

<asp:DropDownList ID="DropDownList" AppendDataBoundItems="True" runat="server"

                  DataTextField="Description" DataValueField="CommonCodeId" TabIndex="4" 

                    CssClass="drop_red_style1" AutoPostBack="True" CausesValidation="True" 

                     OnSelectedIndexChanged="DropDownList_SelectedIndexChanged">

                </asp:DropDownList>



<asp:RequiredFieldValidator ID="RequiredFieldValidator" runat="server" ControlToValidate="DropDownList"

                    Display="Dynamic" InitialValue="0" SetFocusOnError="true" ValidationGroup="Registration">Required</asp:RequiredFieldValidator>

Hi everyone,

This is really weird...I have a ASP.NET page for mobile view.

On that page I have this part:

<td><asp:DropDownList ID="DropDownLocation" runat="server" AutoPostBack="true" OnSelectedIndexChanged="test" 
                            appenddatabounditems="True" style=" font-size:large; vertical-align:middle;" Width="170px">
                    <asp:ListItem value="Houston">Houston</asp:ListItem>
                    <asp:ListItem value="El Paso">El Paso</asp:ListItem>
                    <asp:ListItem value="Austin">Austin</asp:ListItem>
                    <asp:ListItem value="Boise">Boise</asp:ListItem>
                    <asp:ListItem value="Washington">Washington</asp:ListItem>
            </asp:DropDownList>

While testing this on normal computer using IE7 IE8 it fires the AutoPostBack Control.

BUT TESTING IN IPHONE THIS DOES NOT FIRES....

ALSO THE DISPLAY IS WIERD BECAUSE A SEPARATE BOX APPEARS AT THE BOTTOM TO SELECT THE LIST.

What am I doing wrong?

Thank you in advance!

Hi All,

I have a grid which is getting bound from a dataset and the autogeneratecolumns prperty is set to true.

Now i have a menu control. And when i select a particular cell, I want to headertext of the cell selected should appear as the text of the menu item.

But because autogeneratecolumns = true, so i gridview.columns.count=0. So not able to get the header text.

The code goes as follows.

If selectedColumnIndex > 4 Then
                menuBSDet.Items(0).ChildItems(menuDetail.RemoveDetValues).Enabled = True
                menuBSDet.Items(0).ChildItems(menuDetail.RemoveDetValues).Text = "Remove " & gvwBSDetails.Columns(selectedColumnIndex).HeaderText
            Else...

Can somebody please help?

I have three AJAX sliders and each has a:

<asp:AsyncPostBackTrigger ControlID="Slider1" EventName="TextChanged" />
<asp:AsyncPostBackTrigger ControlID="Slider2" EventName="TextChanged" />
<asp:AsyncPostBackTrigger ControlID="Slider3" EventName="TextChanged" />

When I do a TextChanged event on slider1 (by dragging the slider, changing the value), the protected void Slider1_TextChanged(object sender, EventArgs e) event FIRES,  however, the TWO other sliders, protected void Slider2_TextChange, and protected void Slider3_TextChange  also FIRES.  What gives?  why do they fire when I am physically only sliding the slider1 across.  The two other sliders values did not change on the webform, yet the event fired.

In order for the event to fire for slider1, I had to insert "Autopostback=true" in the <asp:TextBox ID="Slider1" autopostback="true" OnTextChanged="Slider1_TextChanged">.  For <asp:TextBox2> and <asp:Textbox3> I did not put the autopostback event for now.

thanks!!!

Hi everyone,

my question is very simple. I had read through many post include this: http://blog.anasghanem.com/post/How-to-get-the-readonly-textbox-value-on-the-server-.aspx

I have a calender extender and the date was target to a texbox. This textbox, i had set it to readonly and it is validate by a required field validator. so mean this texbox must have a value inside. my prob is, i bind the textbox to database and if data is NULL or empty i can't save it because the required field validator was validate textbox as empty value at cllient side. If i remove the required field validator everthing fine. But this is not i want. I have try to set the textbox to javascript onCopy,onPaste,onkeyup. but user also can delete and paste into the textbox.

i have think to disable the requried field validtor at server side when data is inserted. Anyone know how?

 I am trying to get the required field validator to work. I have given it an initial value of the first index value in the dropdown list. I is just not working. Will my contrrols residing on a View of a Multiview control effect anything. I am using all drop down lists?

I have the following code:

.aspx
<asp:DropDownList ID="ddlCountries" AutoPostBack="true" runat="server">
</asp:DropDownList>
<cc1:cascadingdropdown ID="cddCountries" runat="server" Category="Country" Enabled="True" LoadingText="loading" PromptText="choose country"
    ServiceMethod="GetCountries" ServicePath="geolocation.asmx" TargetControlID="ddlCountries">
</cc1:cascadingdropdown>


code behind
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    ShowSearchResults()
End Sub

Private Sub ShowSearchResults()

End Sub


Why is the ShowSearchResults method not called when I change a value in the ddlCountries dropdown, even though I have autopostback="true" on it.

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?

Hi,

How to use required field validator along with ajax toolkit editor control?

Hi,

I am calling JQuery in code behind (button click event) as follows:

...

msg = "csscody.error('<h1>Error</h1><br><p>There is an Error Occurred while manual request entry process</p>')"
ScriptManager.RegisterStartupScript(Button11, Button11.GetType, "alertscript", msg, True)

The problem is when this alert box appears (csscody.error) the dropdownlist boxes on this div tag (overlay) disappears.Here is the
html:
<div class="modal2" id="prompt2">
        <