JavaScript - Persist Dynamic Inserted Content Across Postback?
Feb 3, 2011
I have a div lets say :
<div id="foo">
</div>
Now I inserted some html content inside this div on some button click(without postback) . Now when I perform a postback on some action say on server control submit button , I want the html(which I inserted via javascript) be persisted in the foo div. Right now I am thinking to take an hidden input server control and when the form will be submitted I will insert the content of foo div in that hidden control, the next time when the page loads after the postback I will fill the foo div with the content inside the hidden field. Am I going with correct approach or is their any other good approach which I should opt ?
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Dec 23, 2010
(Example code below)
I have a GridView. It has a 'static' TemplateField (in the .aspx page). I add and remove BoundFields to it depending on user preferences on postback. Affter the second postback, the template field appears empty.
Here is a stripped down mockup of what I'm doing. You can click the "Regular Postback" button as much as you want, and nothing bad happens. But if you click the "Recreate" button once-- it's all ok. Click it again, and the "one" column goes on Christmas break.
So is there something else I should be doing, or is this going to be a "halcyon1234 to code interface" error.
[Code]....
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Jan 20, 2011
I am working with a user control which is inside an UpdatePanel. The user control uses swfobject to add a flash object to a div in the user control. Part of the functionality of the user control is it allows the user to change 'channel'. The channel is set and handled in the code behind hence the call in the JavaScript below to <%=channel%>.
The problem I have is that when the new channel is saved, the JavaScript code below is still pointing to the old channel. The only way I can fix this is to refresh the page via the code behind, but I'm thinking there must be a better way to do this..
[Code]....
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Jul 1, 2010
I have a repeater that displays financial data and prices for various stocks.
On this page, I also have an "export" button that needs to take the data ~on the screen~ and convert it into a CSV for the user.
The problem is, after I databind my list of "Stock" entities:
List<Stock> stocks = GetStocks()
rptStockList.DataSource = stocks;
rptStockList.DataBind();
The data is not persisted on postback.
Also, the data on this page is constantly being updated via an UpdatePanel and a Timer control (being re-databound each time). Every 30 seconds the prices displayed for the various stocks in the repeater control change.
Now, I have a linkbutton that has a click event method in the code-behind that is supposed to export the ~data on the screen~ for the user. I need to grab the current values for the list of stocks last databound to the repeater. I can't simply go grab the latest values from the database because those will have been changed in the time between the last refresh.
protected void lbtnExportStocks_Click(object sender, EventArgs e)
{
// No longer have the stock data used in the repeater control
ExportStocksToExcel();
}
I know that ASP.NET doesn't persist the datasource for the repeater on post-back but I need to still be able to either re-construct this list of Stock entities so I can send them the CSV or I need persist it in some way.
I don't want to do anything that is too heavy handed in terms of performance because during certain days of the week this application can have some heavy usage.
What is the proper solution to this type of situation? Should I iterate through the Repeater's "Items" collection and reconstruct the Stock entities?
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Jan 26, 2011
I bind textbox to a property of an object. After running the app, if the value of textbox is changed, I expect the object to update this property .This does not happen. I also understand that I am recreating the object from viewstate on postback, which is wrong. how to persist the state of object on postbacks all.
[Code]....
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Nov 18, 2010
I am trying to figure out how to persist the playing of a Silverlight MediaElement playing within a Silverlight User Control embedded in an ASP.NET during postback.
The scenario goes:
Have a media player on a site, press play, continue navigating through site while the music continues playing.
What it does right now:
Obviously the object gets loaded anew on each postback or page redirect (even if it's back to the same page IE: default.aspx).
I've seen samples of how to persist the state of a Control on postback and even complex data through cross-page postback. But nothing that covers my specific case.
Other particulars:
Silverlight 2
ASP.NET
C#
My default.aspx:
[code]....
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Nov 22, 2010
I ve been searching for this on various forums and came through a number of supposed solutions which didnt work for me.
My web form works perfectly for me when on development and after publishing on IIS but when I try to access remotely the session value is always null.
I do these things in the following order and when accessing remotely I always get the exception i throw when session is null.
I debugged it and my list is never null when reaching the assignment point.
[code]....
in webconfig I have the following tag which I saw as an answer in many forums
<sessionState mode="InProc" cookieless="true" timeout="200" />
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Jan 17, 2014
i want to hold data at runtimeEx-I have a 3 Services A,B,C and in A,B,C contain services list,then if user select A service and 3 services in a A Listagain user select B service and 2 services in a B Listand again user Select C Service and select 1 services in a C listSo How i can hold data A,B,C services ID'S value with respect to services listID'S value at runtime.
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Oct 5, 2010
I have a grid view whose 1st column is Image Field. Now I assign 1 out of 4 images to each row at runtime. I have this gridview in ajax updatepanel. Now how can i persist the images in the first column after a postback.
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Oct 5, 2010
i have created a user control UserControl.ascx, in Code behind file of UserControl.ascx i have created an object of a class MyClass.cs,
Like
if(!Page.IsPostback) {
objMyClass= new MyClass();
}
but when i click on button of UserControl.ascx page and try to access objMyClass object then it set as null, so how to persist MyClass object when page PostBack, i wanted to keep object persist till the user access the page, when user goes out of this page then object should distroy?
[code].....
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Oct 18, 2010
Im binding the gridview in page load.After i click the link button in the gridview it displays another gridview.I have a checkbox in that gridview.I check some of the checkboxes.while i click the save button i want to get that checkbox state whether its checked or not.Bt for me its showing no records in the grid.How do i persist my data and get the checbox's state.
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Sep 29, 2010
I have an object to hold some specific state information in my web application - I pass it back & forward between pages by making it a property of a basepage which works fine, but I lose it on postback.
Is there any way to persist this property without manually adding & reading it again from viewstate?
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Jul 23, 2010
The only thing I can think to do is to call GetByExample(entityJustInserted) and pick the one with the highest ID. Not great...anyone got a better way?
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Jan 25, 2011
I'm having difficulty trying to create and persist controls inside of a gridview during postbacks. I have an unbound Datagrid control which is created with x number of rows and y number of columns during the Page_Load event.
[Code]....
During the RowDataBound event of the GridView, I create a placeholder control and then I create a label and add the label to the placeholder
[Code]....
On the first page load when navigating to the page, the grid dispays perfectly and the labels are created with no issues and I can see the "1" in every single cell of the Gridview. I basically need the labels in the cells to store an ID when the cell is clicked (the click event works with no issues, wired it all up with javascript) and Since the Cells to not exist prior to "Building the matrix" method, How can I persist the Label controls inside of the tablecells between postbacks so I can assign and read values from them.
I've read a number of online posts from 4guys from rolla and they demonstrate how to persist a handful of controls dynamically created in a staticly defined PlaceHolder conrol outside of the complicated setup of the gridview and have failed at adapting them. The golden rule seems to be to 'recreate' the controls during Page_PreInit during the postback, but I can't seem to get it working.
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Jan 6, 2011
how to persist javascript changes on the server side.For example if I added items to a drop down list client side, how can i persist them in order to read them on the server side.By the way, Telerik control have this feature.
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Jan 4, 2010
I am building a website in which all of the site layout is in Master page and the content of the site is in the inherited pages. I have various links for navigation in which i simple use Response.Redirect to transfer to different pages. Now the problem is that I want to put the content place holder inside Ajax Update panel so that the postbacks are Asynchronous and I want to show the postback by an animated image inside Update Panel progress control. The problem is that I am unable to achieve this result and the entire page is posted back and rendered again. I have placed the content place holder inside the Ajax control toolkit's Update panel but it does not work. Is there any way that I can change the content of the content place holder to a new page with asynchronous postback.
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Feb 25, 2011
I'm very new to ASP.net. I have a c# content page, in which I want to inset this code half way down within the HTML:
<%
HttpResponse r = Response;
r.Write(HttpContext.Current.Request.ServerVariables["SERVER_NAME"]);
%>
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how to get this code inline instead?
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Feb 25, 2011
I have created a really simple custom control to render panels into a page. The code is below. When I use my control and add any webcontrol to it, after each page postback the contents of these child controls vanishes.
I must have missed something really simple but run the example to reproduce this. Can anyone please enlighten me as to why the controls are being 'emptied' of their contents, and how I stop this occuring?
Here is the code for the control
[Code]....
And here's how I am using it in a sample page:
[Code]....
[Code]....
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Jan 13, 2010
I added some javascript to fill in a dropdown and it works wonderfully. However, when I try to access the value in codebehind to submit the data, the value shows as null. (string strValue = ddlName.SelectedValue;).
[Code]....
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Mar 3, 2010
I have a ASPX page, on this page there are two dropdown list, one button and one gridview. When the pages is loaded,these two dropdown would bind data from sql server. Then you select items from these two dropdown list, then click Button A to get data from sql server based on these two dropdown list, rendering the data using gridview. There is another Button, Button B. Then I click the Button B to do something, like send mail. But the page becomes the first time it's loaded, the content disappeared after postback. How can I keep the content after I click the Button B?
void SendInvitationMail_Click(object sender, EventArgs e)
{
send mail here
}
void QueryButton_Click(object sender, EventArgs e)
[Code]....
After I click the Query Button, it would get bind the data to gridview, then I click the Send Mail button. I want to keep all the result even I click the Send Mail button.
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Feb 4, 2011
I have a js function
function(id){
// do a postback here and get the id on the server side
}
I need to send the id to the server, how could I do this?
any way will do, using additional/hidden controls anything
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Oct 29, 2010
I've got a number of MasterPages with ContentPlaceHolders. I do not know how much Placeholders are on the MasterPage. Now i want to load Content to the PlaceHolder, id the ContentPlaceHolder exists. When i use the this.Master.FindControl the MasterPage renders and the added Content would not be rendered. See: [URL] Soo I tried two posibilities of adding the content:
[Code]....
Second way:
[Code]....
The first way seems to be the faster way. But which is the "better" way? Would any of this make any problems?
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Jan 4, 2010
I am learning ASP .NET and I want to understand the workflow when working with dynamic data. For a basic page structure: header, menu, content panel, I would like to use the content panel to display data ( a profile like page ) I have in a database base on the user selection in a menu control. What I want to find out is how do I implement that content panel part so that it gets built dynamically. What is the best practice for this creating custom controls for every dynamic section of the page? Do I need to create my own ContentPanel user control? Or is there a way to take that <div> andinject content in it at runtime?
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Mar 16, 2010
Ok. I've made this awe-crap-code Exporting table to XLS (but still no idea how to make it editable (not read only ))
The task for now is printing data from GridView. I can send it to HTML format (like on XLS) but with no lines and download file for print is weird.
How can I make some "Print-View" for my GridView (with lines... ) and Print it then ?
Is it possible on web site ? without download.
by the way here is how I do export ..)
using System;
using System.Data;
using System.Configuration;
using System.IO;
using System.Web;
[Code]....
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Jun 16, 2015
I have referred link [URL] .....
I need to add the dynamic dropdown on content page from content page itself,i have tried the below code its throwing error object instance property cannot be null.
protected void Page_PreInit(object sender, EventArgs e) {
//Create a Dynamic Panel
Panel pnlDropDownList;
pnlDropDownList = new Panel();
pnlDropDownList.ID = "pnlDropDownList";
[Code] .....
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