I've a checkbox with autopostback=true. If i check the checkbox the postback occurs and changes a label text. But if i click back in the browser the checkbox is not returning to its previous unchecked state. How can i bring back its state?
Can i write some JavaScript to persist the state of a control?
how can DropDownList attributes be persisted accross page Postbacks?
Example:
DropdownList1.AutoPostBack = True
DropdownList1.items(0).Attributes.Add("Attribute1","somevalue")
On Postback the attribute is no longer available (ie. attributes.count=0).
I tried persisting using the code below, but was unsuccessful:
Before PostBack: ViewState.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = ViewState("DDL")
This generated the error: DropDownlist is not marked as serializable.
I than tried:
Before PostBack: Session.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = Session("DDL")
This did not err but attributes were still not available.
Suppose I have created a spgridview with the following code.
[Code].....
To persist the checkbox states between pagebacks ,currently i am using session states.It has some draw backs.Now how can I persist the checked states,when the user manually checks all the checkboxes,how can i make a check on the header checkbox?
I've created a visual webpart .My user control is gridview,in which one of the column is checkbox.The checked state of my checkbox within a gridview get disappeared during postbacks. I want to maintain the checked state.
View 1 RepliesI have a very common problem with asp.net . I have designed a webpage that performs some action on its load event but whenever a user clicks on back button those actions are not performed as Page_Load event is not called.I have searched a lot of forums but wasn't able to get a exact answer. All I was able to know that it was happening due to cache memory maintained by browsers. I don't want to delete that cache. I want browser to work in normal way.
View 3 RepliesAlright, so here's my basic ASP.NET page setup: I've got a page with a GridView that has ContentTemplates in it. You can add a row and edit/remove rows at any time. There's a "New" button that creates a new row.
All of this data is bound to custom data objects. So if I have a GridView of "People" and each row has "FirstName", "LastName", and "Gender" (with TextBox and DropDown controls), I then have a "Person" object which has public properties for "FirstName", "LastName", etc. I have the binding set up correctly, and I can push data into the GridView from the object, and I persist the object with the Session variable. My page lifetime structure looks something like this:
Page_Load: Loads the List(Of Person) from Session()
Any events fire, and modify the List(Of Person).After any event, the List(Of Person) gets saved back into Session(), and is then DataBound to the GridView (and any subsequent fields are also DataBound, such as the DropDownList.
My question is: Whenever I fill in rows in the GridView, and then add a new row (there is no database saving going on whatsoever), my fields clear out and don't persist across PostBacks. So, how can I persist my custom data objects with databinding across postbacks?
I have been spending a better part of a week trying to track down why I am not able to clear all session variables in a web app (vs 2010, vb.net). What I have tracked it down to is that when I remove or abandon sessions that my html pages or codebehind access, it works, but for some reason in any of my class files where I use "Public Shared strConnection as String = HttpContext.Current.Session("strConnection").ToString" to access a session variable, it finds the old one and not the current one. I have to wait for it to time out, go in again, and it will find the new one.
I do not use Linq, and there is only one place in the whole web app that I place the connection string in a variable whcih is when a person logs in. It points them to the correct database. The sqlconnection is set for all of my listviews in Page_Init to make sure that they aren't using any session variable that they create on their own. Interestingly enough that if I use debug to go in each time, exit debug, enter debug again trying to access a different database, it works correct each time. I assume that debug is correctly killing the session variable for the classes for me.
At present i am able to persist that using session InProc mode. except that i cant use either stateserver or sql server as the HTTPPostedFile is not serilizable. i can't use viewstate either for the same reason. Is there any work around to persist that httppostedfile across postbacks for session modes other than inProc or viewstate?
View 4 Repliesi am using vs2008. 1/ i am placed a datagrid control, a textbox and a server side button are inside the CollapsiblePanelExtender.
2/ The collapsible panel Extender placed inside the updatepanel.
3/ outside of updatepanel i have another button("next page") to redirect to next page.
When the page is loading, i am displaying all the records in datagrid. For an example 100 rocords. if i entered some values in textbox and click the button it fetches searching result based on inputs and displaying it in datagrid (for example searched result 20).
Now, I click the button "next page" it redirect to next page. if the user click the browser back button, i need to keep the datagrid to show only searched result. but Instead of that, it displaying all the records(100 records). how to resolve this?
I am using the following code to ensure that the web pages in my website are not cached by the browser:
this.Response.Expires = 0;
this.Response.AppendHeader("Pragma", "no-cache");
this.Response.Cache.SetNoStore();
This is working fine & the browser displays a page with the message, "Warning. This page has expired....". Is there any way I can display a custom page instead of the default page shown by the browser?
I have an ASP.NET page that contains two div's. Both have search fields and a search button contained within each of them. When I first come to this page, Div A has the class 'SearchDiv' while Div B has 'SearchDivDisabled'. These classes change the appearance so the user knows which search type they currently have enabled.
When Div B is clicked, JavaScript changes it's class to 'SearchDiv', and changes Div A to 'SearchDivDisabled'. This all works like a charm. The problem I have is when a user changes to Div B, clicks Div B's search button (which obviously redirects to a results page), and then uses the browser's back button. When they return to the search page, Div A is enabled again, and Div B is Disabled, even though they last used Div B. In the search button event handler I set the class attribute of the Divs before I redirect, hoping this will update the page on the server so when the user returns, their last-enabled Div will still be enabled (regardless of which one was enabled when the page was first visited).I believe this involves the ViewState, but I'm unsure why the class attribute is not saved so when the user returns to the page it is restored.
Edit: Here is the button event handler code:
protected void RedirectToResults(int searchEnum, string resultPage)
{
ShowContainer(searchEnum);[code]....
RedirectToResults() is called from the actual button event handler with the enum representing the selected search panel and the results page url. SearchContainers is a dictionary mapping an integer to the search Div. The important code is the last line, where I'm updating the selected search container with the 'active' search class, rather than the disabled one (which I assign to the other div(s) )
Additional Update: I have been battling with this issue for the last couple days. I was sort of able to get the following code to work (in page_load):
Response.AppendHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
Response.AppendHeader("Pragma", "no-cache"); // HTTP 1.0.
Response.AppendHeader("Expires", "0"); // Proxies.
But this really isn't a solution, as everything else that gets cached correctly is lost, which leaves me worse off than when I started. Everything else seems to persist fine, it is just the class of the div that is causing me struggles.
Edit: Just wanted to update this for anyone else that comes across this. While I believe there is a solution here with setting the cacheability of the page to force the browser to postback, I could not get it working 100% with all browsers (primarily Firefox was giving me fits, which is a documented bug). I do believe the cookie solution would work, but I felt that may be a bit more complex than necessary for just trying to store the state of a couple div's.
What I ended up doing was tying the div's class to the state of it's correlating radio button (there are radio buttons next to the div which allow the users a more visual way of enabling search panels). I noticed these radio buttons retained the correct checked value when the back button was used, so I could guarantee they would indicate the correct div to be enabled. So in JavaScript's onload I check which radio button is enabled, and then adjust the classes of the search div's accordingly. This is a pretty big hack, but has worked 100% across all browsers, and only took about 10 lines of JavaScript.
I have an action where I get the list from the database and pass it to the view. Now, I want that when I fire another action I can somehow get hold of that list (List). How can I do that since ViewData and the TempData is erased on each request.
View 1 Repliesi have repeater
[Code]....
and have code behind
[Code]....
when i click chk_packages checkbox myCheckedChanged fired and i want single checkbox to get enable
I've a checkbox and a label in a page. If check/uncheck the checkbox the label's text is updated such as "Checked/UnChecked".Here is my problem. The page loads initially with the checkbox unchecked. So after i check it and the postback occurs it shows as checked. But if i click the browser back button, the label is getting revoked to its original state before the postback (showing the text as 'unchecked'), but the checkbox is not getting back to its unchecked.I know that this is the native behavior. But can i write any javascript fix to get this thing done?
View 9 RepliesI'm building a web application that has a particular model representing some events. Users need to be able to add N number of people to a given event. Choosing people is handled by a partial view.
I'm trying to build a menu that displays when users click "add a person" to the event. Because the event hasn't been filled out completely yet, there is nothing in the database to persist between requests.
I also have validation logic on the event page.
My proposed solution is to add the form to search or add for people on the event form itself and have a submit button that sends the values that have been added back to the server, where I can store them in ViewData or Session.
Unfortunately, doing this flags the validation.
My second solution is to load a partial view responsible for loading the UI to add/search for a person. I could add a little code on the method in the controller that returns a partial view storing the existing data in a session variable or viewdata. Trouble is, I have to submit the form to do it--again tripping the validation!!!
I'm wondering if perhaps I chose the wrong tool to do this...because in webforms, there would probably be a postback and you would just perform an operation on that postback. I'd like to avoid rewriting the application in webforms and am wondering if there are ways I'm overlooking in ASP.NET MVC.
I wish to persist a class object across postbacks by using a single session variable/object/whatever.
The class has about a dozen single variable properties; and about a dozen table properties; and several methods. The main table tracks rows of sporting event results. The web site will collect one row at a time for each postback. The data in the object's constructor is based on a dataset, but the data in the class will grow each time I do a postback so I don't want to loose the information in the class. The data isn't very big - it will fill a single computer screen.
Being new to programming I am thinking that I can store the dataset in the session but that would slow down the response time because I the methods would have to be called to refine the data - or maybe I can just store the entire class object in a session.
got [URL] - two separate apps in IIS.
Want the forms based auth to persist (they use the same database for membership)
I tried to simply add a "." before the domain name in the forms tags (see below for example) - but this didn't work - it acutally prevented me from logging in at all. how i can persist the login? Does the admin need the same values for "name", "path" and "domain" as the main site?
[code]....
I'm writing an ASP.Net application (no AJAX, but maybe) and there's a requirement to have a list of companies graded under a traffic light system. I intend to have these in a collapsible hierarchical list on the Master page, e.g. Red expands to show companies, and then companies can be further expanded.
how can I keep the expanded list in the same place, with the same content visible, between page loads?
I am using this code to pass variables from ASP.NET application to HTML Application:
[Code]....
The above code is run from page_laod event, and I am making some development changes on the Development Machine (say
http://eutdev02/ehrmd).
After the ASPX page is loaded, and I debug the javascript in the HTML (F12 under IE8), and can see the Cookie is found in the browser.
But, when I open the target HTML/Javascript web page (which will read the cookie prmStaffID), but the HTML Page is on the production machine (separate server say
http://prod01/Attendance.html), the Cookie is not found !!!
It seems to me that Cookies will persist only on one IIS Server, and will not be global.
Question:How I can persist the Cookie on the Client Machine regardless of the the Server Machine ?
For testing purposes, I want to send the cookie to the client from teh Development Server, but the target application is under HTML/Javascript, and I want to be able to read the same Cookie using Javascript.
just been trying to recieve the session value from multiple jquery ajax requests on the same domain name. i think i understand that each request is kind of a virtual browser request so the session is mutally exclusive to each request, but there must be a way some how, has anyone solved this. Basically this is what im trying to do:
I have tries using type: GET and POST but still no luck.
First request - Stores the product id in a session
[code]....
I have a simple user control containing two text boxes which I am adding to placeholder on Button Click event. I am storing the number(count) of clicks in View state and running a loop using count to create all previously added user control. I am also adding IDs to each User control (appending "UC" and count). I have also checked in view source the ids are same each time they are created. I have another button which basically does an post back. I have EnableViewState enabled ="true" in all controlls all the way up to Page Level. My problem is that User Input does not persist on postback. Should this not be happening automatically for me?
View 2 RepliesI read this article first to try to solve this issue, but I am already loading the controls in the Init phase of the page, yet viewstate is not persisting. Any ideas as to why? (Of note is that this is for a custom module in DNN and I do have some AJAX update panels on the page, though this section is not within an update panel, for what it's worth.)
As an overview of what I've got:
1. LoadControl.ascx - based on reading query string parameters, determines whether to load the master or the detail .ascx.
2. Master.ascx
3. Detail.ascx
In my master control I dynamically load either a master or detail sub-control in the page_Init. The detail page has a treeview control and then uses a multi-view control to display the panel associated with the depth of the node selected on the tree. On the panel being displayed I have a cascading ddl within a detailsview control which initiates a postback to select the child ddl based on the parent ddl selection. However, when the page refreshes after the postback, both ddls have resorted to their default selection.
What is interesting however, and I just realized this as I am typing, is that the Treeview is populated when the page comes back from the postback, so that is only possible if viewstate is being persisted right? (See the page_load code and you'll see that Call PopulateRootLevel(intTreeUserID) which populates the treeview, is not called on postbacks....hmmm.
Any ideas as to why the treeview maintains viewstate but not my ddls???? But though the tree is populated, I do have to explicitly select the node again and set the panel that the detailsview control is on to visible again too....
Here is the dynamically loaded control code:
[Code]....
And in the Detail.ascx page load I've got:
[Code]....
[Code]....
I've created a Sign Out link on my page, just like the one you see on the top right hand corner of this forum.
This is the code i use :
<asp:HyperLink NavigateUrl="~/Login.aspx" ID="hypSignOut" runat="server" Text="Sign Out"></asp:HyperLink>
However, after signing out, I click the back button on my browser, I can still go back into the site. How do I prevent this?
When I click Logout page redirect to Login page but when click to browser arrow back then it will goes back, I want to after Logout cannot going to back page...
View 1 RepliesI am developing my map function. When i click the state on country map, it should return the state name. But it didn't. I've spending a lot of time google about it and try a lot of ways to solve it. But i keep getting the JS error:"null" is null or not an object. Is it because my dropdown list having this runat="server" attribute???I don't want to delete this attribute since i am using it in my code behind.
Here is piece of my code behind for the state ddl.
[Code]....
And here is piece of my html code:
[Code]....
Then, i have multiple events for the map onclick function. Here is the code:
[Code]....