Dropdown Looses Its Content After A Postback
Jun 19, 2014I have a dropdown that is populated from the database on my page_load event, however, the drop down looses its content after a postback.
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public partial class keyexam2 : System.Web.UI.Page {
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[CODE]..
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View 9 RepliesC# - Keep The Content After Postback?
Mar 3, 2010I 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)
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send mail here
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[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.
Keep The Values In Dropdown After A Postback?
Oct 29, 2010How can I keep the values in dropdown after a postback? I have this code:
[Code]....
The dropdonws is set to autopostback. How can i bind the dropdowns in a better way then I do now? When I post back the dropdowns are set to default value.
C# - Reload A Dropdown On Postback?
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[Code]....
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Here is my extender code:
[Code]....
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Aug 15, 2010If I go to a content page on my website and enter some data into a textbox, then BEFORE I move focus from that control I press ENTER on the keyboard, the page_load event registers a postback event which in turn passes control to the Master page's page_load event where another postback=true is registered and THEN control goes to the first button on the Master page which is HOME, and then incorrect processing results. Autopostbacks are set to False on the textboxes. If I do not key data into any textbox and press ENTER on the keyboard, I correctly stay within the form
If I use the mouse or tab to navigate thru the textboxes, fill them in and press the Submit button, everything works fine. I cannot see why entering data into the textboxes triggers this action, and even so, why control does not return but instead gets 'lost' on the Master page.
Web Forms :: ContentPlaceHolder On Postback - Doesn't Add Content
Dec 29, 2010[Code]....
Then, in the codebehind I have this code:
[Code]....
This works fine when I display the page. However, when I click the language link which causes a postback the content block does not get added to the placeholder, so I get a null reference because those two panels don't exist. I've been pulling my hair out over this for a few hours now and I can't figure it out. In case it helps, here is my InitializeCutlture method:
[Code]....
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Oct 27, 2010I have a dropdown listbox whose datasource is a dictionary.
When I have added items to the list and try to select an item from the list, the item I selected does not get the focus. And this comes when I changed the property autopostback to true.
Here are some of the codes which are relevant to it.
[code]....
AJAX :: Avoid Postback In Multiple Dropdown List
Oct 9, 2010i have 4 dropdownlist..state,district,place,product..where we have to select the product depend on state ,district ,place and product and there is search button for search particular product where iam using gridview to dipslay particular product deatails. i do not want to do auto past back eventfor page when i select dropdownlist...i tried using ajax but still i cant get through..i tried this code. how to use ajax for 4 dropdownlist & 1 button so that i can dispaly product deatails.
View 3 RepliesWeb Forms :: Stop Postback If Selected Value In Dropdown List = No
Oct 14, 2010I want to stop postback if a certain value from a ddl is selected.
I've used VB to create a page whereby if a certain value from a ddl is selected then a hidden panel becomes visible. The problem is the likely answer to a majority of my ddl's is 'No' (or a no type response), however, even though the panel visibility remains false upon selecting No a postback still occurrs, the page refreshes and moves back to the top. I suppose this is a question with 2 possible solutions (or 2 questions rather)
1: Is there anyway of setting postback to false if selected value = No? A typical example of how my code appears is below
[Code]....
(i've used the value '1' to represenet Yes)
2: Is there a way of setting the page position after postback? As you can see in my code above i've set the focus on the next control (being a Radio Button) but i mean, is there an actual way of defining where the scroll bar is set?
AJAX :: Cascading Dropdown Clearing Knowncategoryvalues On Postback
May 4, 2010I have 3 Cascading dropdowns in a user control. After making a selection i want to clear the values of the selections or make it to select some values that I pass in. The ownCategoryValues does not get reset and everytime the service gets called the knowncategory values is the same.At what point should the knowncategoryvalues be changed to reset the dropdowns
View 1 RepliesState Management :: Session Variable Looses Its Value On Next Page?
Jul 23, 2010IDE: MS Visual Studio 2008 / SQL Server 2005 Express / SQL Server Management Studio Express 2005
Skills: Beginner
Well im trying to make a custom login page(im not using ASP.net Login Control), in Admin.aspx page
UserName and Pasword are entered in textboxes , then Code-Behind file checks the UserName and Pasword against DataBase(it stores the UserName and Pasword) if both are correct Session["IsAuthenticated"] = "true" and then user is redirected to AdminArea.aspx
AdminArea.aspx checks if ( Session["IsAuthenticated"].ToString() == "false" ) then redirect to Error page..
but i get NullReferenceException on AdminArea.aspx because Session["IsAuthenticated"] is null , i dont know why ?
I even tried PreviousPage.Session["IsAuthneticated"] but still got the same error..
I debugged,and found out Admin.aspx saves value in Session["IsAuthenticated"] succesfully but AdminArea.aspx looses the Session["IsAuthenticated"]..so it gets null
My Question is how to retain value in Session["IsAuthenticated"] when page is changed (I want to retrieve value in next page from Session)?
JavaScript - Persist Dynamic Inserted Content Across Postback?
Feb 3, 2011I 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 ?
Web Forms :: Get Content Of Programatically Created Control Before Postback?
Sep 2, 2010IŽll try to describe the problem in steps, as this might be the easiest to understand:
1. Page_Load is called when the page is requested, and calls a BuildTable() method
2. The BuildTable method creates a table which contains several textboxes
3. the user types some text in these textboxes
4. The userthen changes an item in a Dropdownlist on the page which is intended to change some other content on the page
5. Page_Load is called, and afterwards the DropDownListBookingType_SelectedIndexChanged(object sender,EventArgs e) method are called, and the content is changed
6. The text the user typed in the programmatically created textbox controls are lost!
Now how do I remain this text information? If just the SelectedIndex_changed method was called first, I could save it in session.. But as far as I can tell, all data on the page are discarded when you create a partial postback :(
