AJAX :: Unable To Get Selected Value Of DropDownList Populated Using JQuery On Server Side

May 7, 2015

We bind dropdown using json and web service but when we click on save button we can not get selected value of that dropdown...

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i'm using jQuery to populate an cascading dropdownlist. But i want to set a selected item after jQuery filled the DDL with items.

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When I use the code below an error accur when click add button to insert into sql because the selected value in DropDownList is back to --select-- Idon't know why it should be the the value I selectedbut when not use this code and bind the DropDownList using wizard it works but I need to use the code to make the first selection is --select--.

private void PopulateDropDownList() {
string constr = ConfigurationManager.ConnectionStrings[1].ConnectionString;
using (SqlConnection con = new SqlConnection(constr)) {
using (SqlCommand cmd = new SqlCommand("SELECT Country_ID,Country_Name FROM Country", con)) {
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[Code] ....

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Data Controls :: Unable To Get TextBox Inside GridView Values Modified Client Side Using JQuery On Server Side

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i have a grid as 

<asp:GridView ID="dgv_passengerdetails" runat="server" AutoGenerateColumns="False"
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[code]...

the string gs=null, if i click the button again then gs takes the value from textbox.

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How to retrieve selected value of dropdownlist  in gridview when dropdown is added dynamically from database.

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I am using C# ASP .NET MVC and ajax calls. I am able to get the display of the table along with all features. But, I don't understand how do I add a checkbox and button. I have tried dom-checkbox as well but can't get it to work.

My code looks like this:

$(document).ready(function () {
$('#personTable').dataTable({
"bJQueryUI": true,
"sPaginationType": "full_numbers",
"bProcessing": true,
"bServerSide": true,
"sAjaxSource": "/Home/GetCustomData",
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sName": "" },
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My Html is :

[table border="1" id="personTable" class="display"]
[/table]

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Gridview SQL Parameter Null From Javascript / Ajax Populated Dropdownlist

Sep 7, 2010

My issue is similar to [URL] how-to-use-the-value-of-a-selected-value-from-a-dropdownlist-populated-with-ajax but I am using ASP.NET, not PHP. I have a dropdownlist that is populated by another dropdownlist's current value through ajax. So if DDL A is 'NY', DDL B is populated with different data relating to 'NY'. I need that data to be posted back to the server because this affects an SQLDataSource parameter. However, as far as I can tell, the value is always null after postback resulting in the gridview to be empty.

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I have an ASP.NET (3.5) web page which calls a few web methods (SOAP based) using jQuery's .ajax method. The web methods implement 'ScriptMethod' attribute and return JSON data. The web service file (asmx) is local to the same project.

I noticed these web methods execute synchronously on the server which means they run sequentially and affect performance negatively, some methods are waiting, when some of them are slow.

I read this article and I am not sure if I understand that WebMethods which implement Scriptmethod can run synchronously only (they implement IHttpHandler not IHttpAsyncHandler).

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VS 2008 / Unable To Get Selected-index Of DropDownList?

Jan 26, 2012

I am populating a DropDownList from a text file (class requirement).

The file is read in the Page_Load method and the DropDownList is populated then.

When I press the Submit button, throughout the process of the code it is supposed to get the SelectedIndex and use it to grab a value out of a List(Of ).

The thing is, nothing is ever passed through. I even setup an alert box and it passes right over the alert box and never even triggers it, but gives me an Index out of range error when it moves to the line right after the Alert.

Code:

Redacted to keep people from stealing classwork.

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How To Return A Rendered Panel Control Content From Server-side As A Result Of JQuery.ajax()

Jun 22, 2010

At first, I should confess that I am not sure if it is a good practice or not. I have came out with the idea due to my practice of jQuery.ajax().

What I want to achieve is depended on this design:

//Server Side; an .asmx file contains a method like this:
[WebMethod]
public string NewContent(string parameter)
{
string renderedHTML = string.Empty();
switch(parameter)
{
case ("person"):
// create an asp.net panel with
// some controls in it that has form elements to enter person data
// render control and assign its html to renderedHTML
break;
case ("department"):
// create an asp.net panel with
// some controls in it that has form elements to enter department data
// render control and assign its html to renderedHTML
break;
}
}

And from the client I want to do this:

// Some html in the page
<script type="text/JavaScript">
jQuery.post('ajax/myWebServices.asmx/NewContent'
function(returnedPanelContent) {
$('.result').html(returnedPanelContent);
});
</script>

Question is:

How can I make it work? Briefly to have a webservice method that returns different asp.net Panel control content created programmatically so that I can get this control rendered as HTML in my client-side and insert it to my web page?

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JQuery :: Unable To Get The Ddl Selected Value

Sep 19, 2010

i tried manytimes to get the selected value for a dropdownlist using jquery, but i failed!!

when i put the following code to get the text i get it successfully,

var ResultValue = $('#<%= ResultDropDownList.ClientID %> :selected').text();

but when i try :

var ResultValue = $('#<%= ResultDropDownList.ClientID %> :selected').value;

what is the problem here?

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May 7, 2015

I am using ITextSharp to create a pdf. But when I am binding data to Gridview dynamically which was actually a result of ajax webmethod, its showing a blank PDF file. So how can I export dynamically binded data to GridView to PDF. Is there any other way to export dynamically binded gridview data to PDF?

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Web Forms :: Unable To Have Multiple Items Selected In A DropDownList?

May 31, 2010

I have just started with this . I am a new user and i want to know that why we cannot have multiple items selected in a DropDownList?

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Jquery - Options For Page With Matching Client-side And Server-side Markup?

Oct 17, 2010

Suppose I'm building a StackOverflow clone using webforms ASP.NET and jQuery. The Question page has a question, several answers, and comments under each. Requirements:Users can post new answers and comments, and edit existing ones, without postbacks. No UpdatePanels; the AJAX calls retrieve just the JSON they need, not HTML fragments. The page loads with all existing answers and comments in place (no javascript needs to run to read the page).

What I'm trying to figure out is how to do this without having to maintain two sets of markup (one that's bound on the client using some form of jQuery templating, and one that's bound on the server using traditional WebForms).

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Javascript - Trying To Add A Client Side Event To A Dropdownlist And I Need To Access The Currently Selected Text?

Sep 1, 2010

I am trying to add a client side event to a dropdownlist and I need to access the currently selected Text. I have tried:

ddl_tech.Attributes.Add("onclick", "document.getElementById('" + chk_techreview.ClientID + "').disabled = this.options[this.selectedIndex].text.Equals(' UNASSIGNED');");
and
ddl_tech.Attributes.Add("onclick", "document.getElementById('" + chk_techreview.ClientID + "').disabled = this.text.Equals(' UNASSIGNED');");

Both of which give me runtime errors when the event is fired.Whats the correct way to access this text property client side?I tried this but it does not enable the checkbox...

ddl_tech.Attributes.Add("onchange", "document.getElementById('" + chk_techreview.ClientID + "').disabled = this.options[this.selectedIndex].text == ' UNASSIGNED';");

ANSWER:

Well, along with having to use == rather than .Equals, when you set a checkbox.enabled = false on the server side it raps the checkbox in tags and sets it to disabled=true; therefore you must set BOTH the checkbox.disabled = false and checkbox.parentElement.disabled = false; on the client side to enable the checkbox!The solution:

ddl_tech.Attributes.Add("onchange", "document.getElementById('" + chk_techreview.ClientID + "').parentElement.disabled = (this.options[this.selectedIndex].text == 'UNASSIGNED'); document.getElementById('" + chk_techreview.ClientID + "').disabled = (this.options[this.selectedIndex].text == 'UNASSIGNED');");

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Forms Data Controls :: Unable To Get Multiple Items Selected In A DropDownList Exception?

Jul 21, 2010

I am trying to hide 2 buttons depending on the value in the dropdownlist. It works when the page is initially loaded but chokes when returning to the page sometimes. I have some pretty simple code in the Page_Load event within an If Not Page.IsPostBack statement

[Code]....
[Code]....

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How To Get The Selected Value From A DropdownList Using JQuery

Aug 12, 2010

I have the following code and it gives me the text but not the value. What is wrong and how do I fix it?

[code]....

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AJAX :: Can Send An Object From Client-side JavaScript To Server-side Code Via AJAX

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I know that I can receive an javascript object from the server via ASP.NET AJAX using Json. But I am not sure how can I send an javascript object from my client-side javascript to my server-side code. And if I can, how can I extract this object in my server-side code and access its members?

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How To Prevent AutoPostBack When DropDownlist Is Selected Using JQuery

Jul 21, 2010

I want to show a confirm dialog when the user selects an item in a DropDownList. If the user presses "Cancel", I want to stop the postback. Here is the function I add to the onchange event:

function imitateConfirmUnload(event) {
if (window.onbeforeunload = null)
return true;

return confirm("Are you sure you want to navigate away from this page?

You have unsaved changes

Press OK to continue or Cancel to stay on the current page.");
}

And this is the relevant bit of code in my startup script to add the handler to the event:

[code]...

The problem is that the postback occurs even if the user selects "Cancel". If I move the handler on to the click event, it works. But it feels clunky to me.

Edit

Correction: it doesn't work onclick, because the dialog prevents selection, so when the user selects OK, no change has taken place, and no postback when you want it!

Edit 2

The DropDownList is inside an UpdatePanel so that may affect behavior.

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Feb 9, 2011

I have 2 update panels where the server-side button (in a jQuery accordion) in the first update panel should update the second update panel.When the button is clicked, jQuery hides the accordion and displays a results div. This all works fine client side to be fair to IE. The server-side onclick event does not fire though in IE. In Firefox it does! The first update panel is displayed below, here the "btnGenerateReport" event should fire server side.

[Code]....

To add confusion ... if I comment out '$accordion.toggle($effect);' lines then the second update panel does get updated.I'm not sure what other information I can give here. I'm stumped as to why this works with Firefox and not IE.

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I am using this basic jQuery modal window example: http://www.ericmmartin.com/projects/simplemodal-demos/

It works fine if I set it up to click a standard HTML button. However, I want to use this as an action dialog window so I need to automatically open it via code-behind. I wrapped the jQuery like this: function launchIt() {

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JQuery Multi-select Dropdownlist Get Selected Values?

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I have an .aspx page with a databound multi-select jquery dropdown. This works nicley but how can i get hold of the selected items in the code behind?

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JQuery :: Server Side Event Not Fire From Jquery

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[Code]....

public
static System.Collections.Generic.List<T> CreateList<T>(params T[] elements) {
return new System.Collections.Generic.List<T>(elements); }
protected void btn_Click(object sender,
EventArgs e)
{
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[code]...

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