AJAX :: Getting Dropdownlist To Update Without Postback / Refresh
Jun 27, 2010
I have a number of cascading dropdownlist controls on a page. The results in dropdownlist2 are dependent on the results in dropdownlist1, pretty basic stuff.
I now would like to eliminate the terrible postback or refresh of the page that occurs after the SelectedIndexChanged event fires on dropdownlist1, is it possible to do that in Ajax?
What I want the results in dropdownlist2 to populate without the obvious refresh of the page.
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Similar Messages:
Nov 4, 2013
I am trying to refresh updatepanel using dropdownlist but facing problems.
<asp:DropDownList ID="ddlClass" EnableViewState="true" AutoPostBack="false" class="input-large span10" runat="server" onchange="loadAllDefaults();" Style="width: auto;">
</asp:DropDownList>
Above is the code of dropdownlist
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlClass" />
</Triggers>
<ContentTemplate>
<asp:Repeater ID="rep1" runat="server">
[Code] ....
This is updatepanel code. as shown in the code, i am referring to ddlClass in triggers which already calls a javascript function loadAllDefaults();
The problem is, since ddlClass is calling javascript function 'onchange' property, i cannot call any other function of backend code and I want to refresh the updatepanel on the basis of selected value of dropdownlist.
How can i do this? I have created a function in c# code in backend but I am not able to call both functions together!
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Oct 1, 2010
I have many controls like dropdown, radiobuttonlist, etc on my page and I put all these controls inside the update panel so that the page doesn't look to be posting back when something is selected. Now the working on the page is very smooth. But the session object isn't getting refreshed even if I postback to the server and as a result even if the users are working on the page they are being sent to the login screen after 20 mins.
Is there anyway where I could put all the controls in update panel and still refresh the session after any postback(dropdown selection)
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May 13, 2010
IAm using ASP.NET Ajax.
Iam having a Update Panel with DropDownList with AutoPostBack="True"
I dont want to postback it, but it going postback, i dont want AutoPostBack="false"
.
Here my code:
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering ="true" >
</asp:ScriptManager>
<br />
<br />
<div>
</div>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack ="true" OnSelectedIndexChanged ="DropDownList1_SelectedIndexChanged" >
<asp:ListItem Value="0">----Select----</asp:ListItem>
<asp:ListItem Value="101">General Admin</asp:ListItem>
<asp:ListItem Value="102">Admin Assistant</asp:ListItem>
<asp:ListItem Value="103">Software</asp:ListItem>
<asp:ListItem Value="104">Recruiting</asp:ListItem>
</asp:DropDownList>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode ="Conditional" >
<ContentTemplate >
<asp:DropDownList
ID="DropDownList2" runat="server">
<asp:ListItem Value="0">----Select----</asp:ListItem>
<asp:ListItem></asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
<Triggers >
<asp:AsyncPostBackTrigger ControlID ="DropDownList1" EventName ="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
</form>
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Jan 12, 2011
I want dont refresh page updata DropDownList I donot use AjaxToolKit
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Oct 15, 2010
When an asynchronous postback happened inside update panel, another postback happens also for MasterPagenot only update panel embedded page .I want to prevent this MasterPage postback . is this possible ?think like i have a MasterPage and another page which is test.aspx which is content page of MasterPagei have update panel at test.aspxwhen asynchronous postback happens at this test.aspx update panel it also loads
MasterPage Page_Loadi want to prevent this (it should not also load MasterPage Page_Load)
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Feb 25, 2010
I have a kiosk application that uses master pages. There is a refresh meta-tag on the master page (or I can add it programmatically using Page.Header.Controls.add(metaTag), it makes no difference for my problem). When the user does not interact with the aplication it should return to the default page. But when the user does react using async postbacks only a partial postback is performed which does not reset the html meta refresh header, so it just keeps on ticking and after x seconds the page redirects to the default page. How can I avoid this from happening. The meta-tag can not be in the updatepanel so even though I can manipulate it from the code-behind when the async postback happens, any changes I make (for example sometimes when the user makes a mistake he should be redirected to a clean version of the page he is currently on after showing a modal message, so I have to change the url of the meta-tag content to no longer use the default page, but the current page) are not implemented.So the main question is, how can I manipulate (or reset in case of refresh meta tag) meta-tags in an async postback ?
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Jan 26, 2010
I have 2 checkboxes (yes/no) that when selected cause the entire page to refresh during postback mode. How can I elimiate this?
[Code]....
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Sep 7, 2010
I have the following tabpanel (it actually contains a bit more content, but that content doesnt influence my issue):
[code]....
When I remote the MaskedEditExtender and MaskedEditValidator, it doesnt show that (undesired) behaviour anymore.Is there something special these controls do that cause them to refresh? Is there a workaround for this?
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Apr 8, 2010
I have a slideshow extender, I will change the slideshow extender's contextkey value by a button click event. So that after button click the slideshow will display different set of image. Originally with postback everything work fine, but I don't want the whole page to refresh.
So I put the slideshow extender inside an updatepanel with triggers target the button click event. Now the whole page didn't refresh and the slideshow extender's contextkey value did change (same code as before) after button click event. However the image set on the slideshow didn't change.
I think I am missing some sort of slideshow extender reload or refresh call but I am not sure how to do this? I didn't see any related property with slideshow extender...
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Jun 15, 2010
I have an update panel with content that needs to be updated by a listview item which is a linkbutton, in .NET 3.5 I just used the defaults on all the controls and everything worked fine, after the upgrade to 4.0 the linkbutton causes a full postback with page refresh. I did try setting the linkbutton's id as the trigger for the update panel and still causes same page refresh. The scriptmanager is on the masterpage with enablepartialrendering = true.
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May 7, 2015
Here is the sample code am trying.
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
[Code] ....
This upload is working. But why the page is getting refreshed? this is not partial post back and instead it 's full post back. i have read the articles for the fileuplaod with issue inside the update panel. is there any way to achieve this asynchronous upload on button click?
I don't want to use the Ajaxtoolkit Asyncupload because that will upload (Ref : [URL] ....] the moment when we seelct the file itself which i don't want to do that. i need to do on the button click event.
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Mar 29, 2010
I am dynamically ading the following to an UpdatePanel
Tab control which has X# of Tabs, each Tab has a various labels and a Rating Control.
When the user hits the Rating contro, the RATING_Changed fires and runs a stored Proc to update the DB. I want the Panel to then display the newest information back from the DB. I can't seem to get the last part to work. I'm still learning .NET so i may have missed somethign easy, but i've tried setting AutoPopstback, using Triggers, etc.
The DB Update does take place but the NEW contents are not displayed
[Code]....
[Code]....
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Jan 7, 2011
How to refresh the update panel on timer_tick event???whats the code for that..?
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Nov 25, 2010
when postback occurs due to update panel's child control then in page load event how can i know that it was dut to update panel ?i.e., i want to differentiate between general postback and postback due to update panel's child control in page load event .How is that possible ?
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May 7, 2015
[URL] .... am using this functionality in my project and it is working very fine but i am facing very strange issue while using this.
The above functionality is not working when we place dropdownlist and textbox inside updatePanel and ModalPopupExtender
The .aspx page where i am using ModalpopupExtender and UpdatePanel for DropDownList and Textbox is below
<%-- *************************** MODAL POPUP EXTENDER ***************************************************** --%>
<asp:HiddenField ID="HiddenField3" runat="server" />
<asp:HiddenField ID="HiddenField4" runat="server" />
<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" PopupControlID="Div6" TargetControlID="HiddenField3"
BackgroundCssClass="modalBackground" CancelControlID="bclosemodalpopup" >
</cc1:ModalPopupExtender>
[Code] ....
The above code is not working with UpdatePanel but it is working if we remove DropdownList and Textbox from updatepanel.
The javascript code which i am using is below
<script type = "text/javascript">
var ddlText, ddlValue, ddl, lblMesg;
function CacheItems() {
ddlText = new Array();
[Code] .....
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Mar 12, 2010
I have a gridView and on the DataBound event I am assigning a Session variable from one of the gridview results. This session is then used to determine if certain nodes in a menu are visible. One problem is that when the session variable is assigned, the menu is not updating, until either I refresh the page manully in the browser or move to another page.
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Jan 8, 2011
How to refresh update panel on the tick event on timer..? how to so this thing??What is the code for that..?
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Sep 23, 2010
I for a page with multiple update panel in parent page, I got a button that will open a child window, after I close the child window, how can I refresh the parent page? And I only want to refresh a single update panel section instead of all other update panel section.
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Mar 25, 2010
I have the webpage with below code. There exists dropdownlist within the gridview and updatepanel. I hope that the dropdownlistddlAltProduct refresh only some portion of data in div when OnSelectedIndexChanged. Not the whole page as now as you see autopostback='true'. How to change the current situations???
<asp:UpdatePanel ID="updPanel" RenderMode="Inline" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label runat="server" ForeColor = "Red" ID="lblMsg" ></asp:Label>
[code]...
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Oct 20, 2010
I was working on this last week and took a break from it to 'regroup' and start over. Here is what I'm trying to accomplish.
1. have a web form with dropdowns to allow the user to select font sizes, colors, background image, etc.
2. I want to the form to be updated with the new styles in an update panel.
3. Once the user clicks the apply button, I want the updatepanel to refresh with the new styles.
I tried this by creating an css on the fly, but the updatepanel wasn't picking up the new css without doing a full page refresh, (which we don't want to do). I only want the updatepanel refresh and either use inline styles, a <style> on the web form etc,
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Jul 29, 2010
if i use a combo box inside an update panel, the updatepanel's partial postback will not work. instead in a postback the page refreshes whole.
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Nov 30, 2010
I want to know how to use auto refresh continuously in ajax update panel..What I want is,I've more than 6 update panels on my page and I want to all the panel to refresh toghether,continuously till I close the page.
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Oct 2, 2010
after filling all criteria when i press search button the result arrives in gridview nw when searchbutton pressed after that every 20seconds i want 2 update gridview data which is in update panel
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Jan 14, 2010
I have a page under MasterPageFile, I try the following code into my page; However, I can't see the update progress content when the page refresh.
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:UpdatePanel runat="server" ID="upLN" UpdateMode="Conditional">
<ContentTemplate>
<table>
<!-- My Web page content here.... -->
</table>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress runat="server" ID="ugLN" AssociatedUpdatePanelID="upLN">
<ProgressTemplate>Image here for showing the progress bar...</ProgressTemplate>
</asp:UpdateProgress>
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