How To Identify Which Controls Are Updated In UpdatePanel
Jul 28, 2010
I have a UserControl (UC) which is in an UpdatePanel. When the UC is loaded, I run a recursive method to set tooltip for all Button, LinkButton, and DropDownList in this UC. The problem is sometimes I only update 1 control in the UC such as a DropDownList, but I have to call the recursive method on all controls of the UC. I was wondering whether there is any way to identify which controls is updated in the UpdatePanel so that I can update correctly these controls.
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Sep 22, 2010
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Jan 8, 2011
I have a web form for payments which consists of a DropDownList (credit card, purchase order, bill me). By default, credit card is selected, and the form (a ListView within a UpdatePanel) is loaded with the user's billing address. If the user changes the payment option, the form fields change -- for example, if purchase order is selected, the billing address + credit card fields disappear and a "Purchase Order Number" textbox appears. This is done using an AsyncPostBackTrigger associated with an event in the DropDownList.My problem is that when the form is submitted, I cannot see the user-entered values within the UpdatePanel/ListView, but I can see the original values loaded in the ListView before the edits were made. For example, if purchase order is selected, I can see the billing address from the ListView, but I cannot see the newly-entered Purchase Order Number from the ListView.Here's an abbreviated version of my code. I've bolded and commented two lines where the problem appears:
[Code]....
[Code]....
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Jan 31, 2010
I want to trigger two Async Postbacks at once using UpdatePanel's via their associated buttons such as the example at the end of [URL] When you click the first button, then immediately click the second button, the first button's message never gets updated. By clicking the second button, the first async Post back seems to be cancelled. Why does this happen?
I saw this article about only allowing one postback to occur at a time here: [URL] Is this the desired behavior for Multiple update panels? Can only one run async code at once? What's the point of it being async if you can't do multiple at once? Here's what I'm trying to do overall: I want a webpage where I click a button which causes C# code to search a certain webpage and parse it. Based on the parsed information, it should automatically start searching multiple other webpages. All the while, I want the web UI to be updated with the progress.
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Feb 19, 2010
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Jul 27, 2010
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What is causing the partial postback not to render anything?
I know this is confusing so I hope I explained myself well enough. I will just post the ASPX so you can see how I am setting this up - I don't think you need to see the code behind... If anyone does then I will post it.
Again - all this is to with the updateMode - when I remove it (as I did in this code sample) it works and renders however I don't want both updatePanel to get updated at the same time.
[Code]....
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[Code]....
[Code]....
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[Code]....
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[Code].....
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[code]...
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Oct 6, 2010
during page load itself textbox and dropdownlist is assigned values. when the values are changed later and button is clicked to pass these values to the next fn only the old value is send
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Text = "before";
ArrayList a = new ArrayList();
a.Add("b");
a.Add("a");
DropDownList1.DataSource = a;
DropDownList1.DataBind();
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}
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abd click the button the new value is not passed
[code]....
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[Code]....
[Code]....
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Dec 17, 2010
I have UpdatePanel1 inside of which I have a Server Side Call Button - BT_ServerCall.
Then I have a second UpdatePanel2 which has a listbox (populated in pageload with some items) , a label, a hidden field, and a Button which calls a javascript function BT_JSCall.
Finally there is a second listbox which does not reside in an updatepanel.
i am populating the second listbox with values selected in the first listbox. then I click the BT_JSCall button which calls the javascript function copy_to_hidden_field() , inside which I take the values from the second listbox and store them as a concatenated string in the hidden field. Lastly, in the javascript function I simulate a button click event on BT_ServerCall. At this point I hit the server side method for the click event and I extract the value from the hidden field. lastly I change the value of the hidden field and also copy the new value to the label. I call the updatepanel2 update method (both updatepanels are set to updatemode conditional).
here is the problem: neither the hidden field nor the label get updated with the new text.
here is code
aspx.cs:
public partial class WebForm3 : System.Web.UI.Page
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