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selected value cleared in postback

I've dynamically bonded select list and when I hit save button then I'm getting value 0 not the selected one.
I'm Using HtmlSelect not Asp:Dropdownlist.
Can anybody help me.?
thanks in advance !!

If you are using html select.,
you use javascript function for change ddl and assign changed ddl value at one hidden field. send that hidden field value to server. Check below code.
function onchangeddl(e) {
var ddl = document.getElementById('ddlid')
for (var i = 0; i < ddl.options.length; i++) {
if (ddl.options[i].text == e.target.options[e.target.options.selectedIndex].text) {
ddl.selectedIndex = i;
ddl.options[i].selectedValue = e.target.options[e.target.options.selectedIndex].value;
ddl.options[i].selected = true;
document.getElementById('<%=hdnfld.ClientID%>').value = e.target.options[e.target.options.selectedIndex].text;
break;
}
}
}
Codebehind.aspx page you have to assign hdnfld value.
I hope its helpful to you.

two dropdowns' selection javascript

I have two visible one hidden dropdown and filter textbox works perfectly except checking flag if option already in selected list part, idea is you filter from hidden and see in visible dropdownlist, then select from visible and that goes to selected list. this part works until I added second for loop and flags which controls if option already in selected list then skip on filter and doesn't show in visible list which doesn't work.
If I delete between "FROM" to "HERE" comments works, but also shows selecteds in visible list.
problem : frozen browser and visible list full of options like infinite.
function SearchList() {
var listHidden = document.getElementById('<%= ddlStudentHidden.ClientID %>');
var listVisible = document.getElementById('<%= ddlStudents.ClientID %>');
var listSelected = document.getElementById('<%= ddlSelecteds.ClientID %>');
var txtFind = document.getElementById('<%= txtFind.ClientID %>');
$("#<%= ddlStudents.ClientID %>").find('option').remove();
for (var i = 0; i < listHidden.options.length; i++) {
if (listHidden.options[i].text.toLowerCase().match(txtFind.value.toLowerCase())) {
/*FROM*/
var flag = false;
for (var i = 0; i < listSelected.options.length; i++) {
if (!listSelected.options[i].text.toLowerCase().match(txtFind.value.toLowerCase())) {
flag = true;
}
}
if (!flag) /*HERE*/
$("#<%= ddlStudents.ClientID %>").append($('<option></option>').val(listHidden.options[i].value).html(listHidden.options[i].text));
}
}
}

Yo declare the variable i again in the inner loop which will override the the i in the outer loop. Rename the variable in the inner loop to something else except i.

how to show confirmation dialog from drop down list?

i have a grid which display data from database, and i have a custom column in the left side with checkbox, i choose records to be deleted and i have a dropdown list, which will trigger an event in server side to delete records, before i delete those records i want to show a confirmation dialog like "are you sure? with ok and cancel", how to do that? any thought?
i do this :
if(ddlAction.SelectedValue == "Delete")
{
string id = string.Empty;
int i = 0;
List<int> idx = new List<int>();
foreach (GridViewRow rowitem in gvDept.Rows)
{
CheckBox itemchk = (CheckBox)rowitem.FindControl("cbSelectOne");
if (itemchk != null & itemchk.Checked)
{
id += rowitem.Cells[3].Text.ToString() + ',';
idx.Add(i);
}
i = i + 1;
}
id = id.Trim(",".ToCharArray());
List<string> objRemoveKeys = id.Split(',').ToList();
if (objRemoveKeys.Count > 0)
{
ddlAction.Attributes.Add("OnChange", "javascript:return confirmDeletion('Are you sure you would like to remove the selected items?');"); // this part not working.
AirAsiaLinqDataContext LinqDataCtx = new AirAsiaLinqDataContext();
var record = from a in LinqDataCtx.departements
where objRemoveKeys.Contains(a.departementcode)
select a;
LinqDataCtx.departements.DeleteAllOnSubmit(record);
LinqDataCtx.SubmitChanges();
for (int j = 0; j < idx.Count; j++)
{
gvDept.DeleteRow(idx[j]);
}
}
ddlAction.SelectedValue = "";
}

This looks like code-behind (C#) code. Dialogs happen on the client side. You can do this relatively easily with jQuery (or even vanilla JavaScript code), or use something like the Ajax Control Toolkit's ConfirmButton:
http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/ConfirmButton/ConfirmButton.aspx
For a little more control over the process you can also give JuiceUI a go: http://juiceui.com/controls/dialog

try this
ddlAction.Attributes.Add("onchange", "return confirm('Are you sure you would like to remove the selected items?');");

you should not only show an alert for confirmation but also check if the user has selected some row or not. below code accomplishes both.
javascript function:
function checkIfSelected() {
if (yourGrid.GetSelectedRowCount() == 0) {
alert("You must select atleast one.");
return false;
}
else {
if (confirm("Are you sure you want to proceed?")) { // This is what you want
}
else {
return false;
}
}
}
your dropdownlist:
<asp:DropDownList ID="ddlAction" onChange="javascript:if( checkIfSelected() == false){return false};" AutoPostBack="true" runat="server" OnSelectedIndexChanged="yourID_SelectedIndexChanged">

trouble wih validation inside of asp wizard

I have a group of 5 textboxes and I am using an asp:wizard. I want to check to see if all of the textboxes are empty I want to fire a label named lblItemBlock. Nothing I have tried has worked so far and so i tried cutting it down even smaller to test. I made the label visible on the page and on the active step tried to set the visible property to false. and for whatever reason it does not work
here is what I have:
protected void OnActiveStepChanged(object sender, EventArgs e)
{
if (Wizard1.ActiveStepIndex == Wizard1.WizardSteps.IndexOf(this.WizardStep3))
{
lblItemBlock.Visible = false;
}
}

Use the textbox/input validator in asp.net

Use a custom validator with client side script. There is probably a better method with 5 inputs but I use this when I need to validate multiple inputs in unison. The following checks that at least one of the text boxes has content:
function searchValidate(oSrc, args) {
var fName = document.getElementById('<%= txtFName.ClientID %>').value;
var mName = document.getElementById('<%= txtMName.ClientID %>').value;
var lName = document.getElementById('<%= txtName.ClientID %>').value;
if (fName == "" && mName == "" && lName == "") {
args.IsValid = false;
} else {
args.IsValid = true;
}
}

How to make the Default focus in content page from master page

I have masterpage with content place holder. i have contentpage which is using master page . in all my content page i need to default focus on the text box so that the user can directly type in text box instead moving the mouse over the textbox. in some page there is no text box so that i donnot nnet keep default focus over there
Is there any way i can do it in my master page once and can reuse that in all my content page
thank you

try using this...
((TextBox)Master.FindControl("txtRequiredFocus")).Focus();

You could include this in your master page's load event:
// if the ID is constant you can use this:
/*TextBox textBox = (TextBox)Page.Controls[0]
.FindControl("ContentPlaceHolder1")
.FindControl("myTextBox");
*/
// this will look for the 1st textbox without hardcoding the ID
TextBox textBox = (TextBox)Page.Controls[0]
.FindControl("ContentPlaceHolder1")
.Controls.OfType<TextBox>()
.FirstOrDefault();
if (textBox != null)
{
textBox.Focus();
}
This would match up with a content page that has the following markup:
<asp:Content ID="Content" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<asp:TextBox ID="myTextBox" runat="server" />
</asp:Content>
EDIT: if LINQ isn't an option then you can use this instead:
foreach (Control control in Page.Controls[0].FindControl("ContentPlaceHolder1").Controls)
{
if (control is TextBox)
{
((TextBox)control).Focus();
break;
}
}

Indiscriminate JavaScript approach to selecting the first valid input field on a page:
function SelectFirstInput() {
var bFound = false;
for (f = 0; f < document.forms.length; f++) {
// for each element in each form
for (i = 0; i < document.forms[f].length; i++) {
// if it's not a hidden element
if (document.forms[f][i].type != "hidden") {
// and it's not disabled
if (document.forms[f][i].disabled != true) {
// set the focus to it
document.forms[f][i].focus();
var bFound = true;
}
}
// if found in this element, stop looking
if (bFound == true)
break;
}
// if found in this form, stop looking
if (bFound == true)
break;
}
}

<script language="javascript" type="text/javascript" >
window.onload=function(){
var t= document.getElementById('<%=TextBox1.clientID %>');
t.focus();
}
</script>

If you use jQuery, a possible solution is:
Give the textbox you want to set focus to a special class. "focus" works well for this purpose.
Write code such as the following in your master page or included by your master page in a js script file:
$(document).ready
(
function()
{
//get an array of DOM elements matching the input.focus selector
var focusElements = $("input.focus").get();
//if a focus element exists
if(focusElements.length > 0)
{
focusElements[0].focus();
}
}
);
A similar approach using vanilla JavaScript would be to tag the textbox with a special attribute. Let's use focus.
window.onload = function()
{
//get all input elements
var inputElements = document.getElementsByTagName("input");
var elementToFocus = null;
for(var i = 0; i < inputElements.length; ++i)
{
var focusAttribute = inputElements[i].getAttribute("focus");
if(focusAttribute)
{
elementToFocus = inputElements[i];
break;
}
}
if(elementToFocus)
{
elementToFocus.focus();
}
};

Control masterC =
Page.Master.FindControl("ContentPlaceHolder1");
TextBox TextBox1 =
masterC.FindControl("TextBoxUsername") as TextBox;
TextBox1.Focus();