Dynamically Updating User Controls?
Feb 20, 2010
i'm using ASP.NET 3.5 with c#. my problem is that i have created a user control and want to dynamically add mulitple instances of these controls to the web form.when a user adds data to one of the user controls i then need to carry out some calcaulations, change the current user control data and then alter all the other user controls to different values(ignoring the one just changed). i then need to alter some of the controls on the main page outside of any user control.i've no real idea how to do this. i've thought about exposing an event in the user control to pass values up to the page. the page then carries out the processing to non 'user-control' controls then drills down to each user control in turn(all user controls are in a placeholder control). but that would be a pain retrieving all the HTML element id's etc....hope that wasn't abit rambling lol.
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Feb 20, 2011
Hosting page:
protected void Page_Load(object sender, EventArgs e)
{
LoadMyControl(Parameters); //Do it every page load to preserve it's state
}
protected void LoadMyControl(string parameters)
{
plchld.Controls.Clear();
Control userControl = LoadControl("TheUserControl.ascx");
userControl.ID = "userControl1";
plchld.Controls.Add(userControl);
}
Now inside this control, when a button is clicked I want to update ,let's say a Label on the hosting page.
What is the best way to do it? Custom event?
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Aug 24, 2013
how to change gridview cell value for a checked row without affecting any changes in database for ex if a row contains quantity of item 6 i want to change it value to 5,4 upto 0 that is on click event of delete quantity button i have identified row with a checkbox in grid view.
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Jan 30, 2011
I have an user control inside an UpdatePanel. Once an event is triggered and updates the user control - it seems to lose its css styles. This happened to me in IE8 only, while in Chrome and FF it was fine.
A user control for example:
[Code]....
In Chrome and FF it seems to be working as expected (button click causes current time to display in the user control, nothing else happens), but in IE8 the div inside the user control loses its styles (background color, borders). What could be causing this problem, and what can be done to prevent it?
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Sep 12, 2010
I'm using a windwos authentication via intranet. I'm able to display the username in a label control on a page load event (which is very simple).
I'm not storing this data anywhere in the table (MS SQL). I have all my data in a table and I'm using a gridview to diplay them. I'm using a button control to update all the rows in the gridview. I wanted to update three columns in the gridview (1. Tickbox, 2.Datetime Stamp and 3.UserId).
I've created a query in the dataset, through which i can update the Tickbox and DateTime stamp using now() function. But I'm not sure how to update the UserID field with the UserName (which inturn updates all the three fields in the gridview when the button is pressed.
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Jul 21, 2010
I want to create a user control that will again contain a user control that will be dynamically generated and can be repeated N times with respect to data present in data table.
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Apr 4, 2011
I'm creating textboxes in the Page_Load event and giving them values, however whenever I load the details I am getting the same output. I always seem to get the first output I got, even on subsequent searches.Here's what my code with the irrelevant information missing:
Textbox txtName = New Textbox();
protected void Page_Load(object sender, EventArgs e)
{
[code]...
If DropDownList has two values (e.g. "Item 1" and "Item 2") and has autopostback enabled, first time it will generate and show "Item 1" in the textbox (the default value for the DropDownList), but if this is changed and the autopostback fires, the textbox does not change.I've tried getting around this by creating a new TextBox, overriding the "LoadPostData" function to prevent this from loading, which got around the issue there, but then I couldn't view the data afterwards.
Any idea how I could get around this? I may be approaching this in the wrong way.Edit: I've added another item to DropDownList that removes TextBox, so that it can be re-created again. It seems to show the correct data when it is re-created after being removed, but if I'm attempting to just edit it, this isn't updating correctly.Edit2: Here's the rest of the code for this page in case this helps at all. The objects which I'm having issues with are SBUName and SBUComments, which are both TextBoxes. The same issue is also happening for SBUClientDropdown but I believe the resolution will be similar:
DBHandler DBHandler = new DBHandler();
List<string> clients = new List<string>();
List<string> clientGroups = new List<string>();
[code]...
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Mar 3, 2011
I have a Dropdownlist in my form as an example as below.
The Dropdownlist items are pulled out from the database table.
When a user Clicks 'Save Template', A new row is created in the database, BUT the dropdownlist items
remains the same :( I want the list to be dynamic so that the user doesn't have to press F5 for updating the list.
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Jan 19, 2010
I'm adding items dynamically when a row is selected from GridView.
1. How can i make the items added are selected by default - (solved)
2. How can i avoid duplicates getting added to list
3. How can i remove them from list when user un-checks them.
And I want to change checkbox with an image and I'm using css like following but it is not working
.cbxCustom
{
...
}[code]....
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Jul 23, 2012
In my project Online Travel Agency, I want that if my employee add a new package in database then newly added package will be shown on package.aspx page dynamically with new tag, so how can i do it.
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Mar 27, 2010
e have a excel file which is updates dynamically, we need to design a web app which will be reading this excel file and should update the datas in the web app dynamically.
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Jul 13, 2010
I want to display the text entered in a textbox on a label character by character. I.e, if I enter a character in textbox, I need to display that character in the label. Up to the length of the textbox, this procedure has to done for the label also.
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Jan 21, 2011
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
[Code]....
the row used to get in edit mode only if i edit the next row means first row never get in edited mode.
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Oct 18, 2010
I'm working on a website that will allow instructors to report on the academic progress of students in their classes. I've got the website set up two primary pages: one with a user control that displays the classes (a GridView of basic class info with a child GridView in a template field that displays student names and checkboxes to select them -- called MiniStudents), and another with a user control that displays the selected students -- called FullStudents.
Although improbable, it's possible that an instructor could have the same student in two separate classes. I've already accounted for this in the current page setup -- the combination of student ID and class ID (class IDs change each quarter, for those thinking this will be an issue) form a unique key within the database. Recently, one of my users asked if I could break records out by classes on the page, so that instructors would be able easily recognize which class they're operating in.
So, my question is this: is it possible for me to dynamically add a column to the end of the class user control that would allow me to switch out MiniStudents for FullStudents?
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Feb 25, 2010
I am working on a page where user controls are dynamically added to the page and refreshed with a timer in an updatepanel.
Since I already coded dynamic user control loading into the page, I would also like to implement *some* form of dynamic layout method for those controls. I was thinking coordinate values.
I have used Top and Left properties on panels before to achieve this functionality in my windows forms applications but since this is a web application things are different.
I realize I can do the whole "absolute positioning layout model" override in Visual Studio but as far as I know this only benefits me at design time. Is there a way to programatically trigger that behavior?
I looked at the silverlight Canvas and how you can pass offset values in with your controls. Something like that would be great, but this isn't Silverlight, lol. I also considered a web method to return globs of html tags to fill the area between these controls.
This is a page that would be reused over and over from client to client so this is why I would like to get this dynamic layout working. It would save me much effort later on.
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Aug 25, 2010
how to create user control dynamically in a web form ?When i am creating server controls of user controls are not instantiated and it is not getting initialized .when i am tyying to initialize its properties error occurs tha object instance not created .
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Sep 5, 2010
I am new to ASP.NET And I am have THE hardest time understanding how to work with forms in ASP.NET. Here's what I am doing:
Dynamically add User Controls to a PlaceHolder based on some int value (which currently is passed in a HiddenField).Fire an event if the WebControls inside of the User Control change, then handle that event in the Main Page (i.e. save the input to DB)When the user clicks the "Next/Continue" button, the next controls for the next page are loaded. And I guess maybe I just can't seem to get how things work in ASP.NET, because I am really struggling with the general idea of how ASP.NET flows.
Should I be dynamically loading the controls in Page_Init, or Page_Load? Or should I load the controls when the buttonclick event is fired?Do I have to add the axCtrl.OnDataChange += new EventHandler(HandleAxControlDataChange); line on Page_Load? Or should I put this in When I first load the UserControl, I need to initialize some WebControls within the UserContorl. Is there a way to know if I have loaded new user controls into my placeholder? I can't use Page.IsPostback, because after the first page, every page is a postback from the buttonclick.
Here's what I have:
[Code]....
[Code]....
[Code]....
[Code]....
[Code]....
Here's the markup from my ASPX file...
[Code]....
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Jun 17, 2010
I have a set of dinamically created User Controls on the page. They are pretty small 170X120 px in size, but when the page is displayed, they are all one under the other. All styling is default, which means they should be positioned in normal flow. Is there any way to place them next to each other. This is not a problem when I dinamically create for standard controls, like a button or an image. Why the user control is different. This is the markup behind the control:
[Code]....
and this is how I create them:
[Code]....
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Jul 19, 2010
i want to be able to load user controls and populate them with data from a sql database at runtime based on a status field in my database but im struggling to do this.
my default page.aspx holds the user controls (acts like a container). at the moment i had referenced all the user controls to load up when the page was loaded so:
[Code]....
[Code]....
i then created a procedure which reads from the database the "status field". so if the status field is "pending" then i want the uc:GRLOLApproval control to show up but im not sure where to put this code or how to do it. i want to be abel to load the control at runtime and run this code. in my default.aspx.cs code i have done the following in the page load:
[Code]....
i tried to reference te user control in my default.aspx page by doing: protected GRLOLApproval GRLOLApp; but it wouldnt recognise it because it not been reference in the source file.how do i reference it so that i can read the data from my database and write to the fields in uc:Collectionrequest. (I have exposed the properties in the uc:CollectionRequest that i want to access btw) have been working on this for days now and just cant seem to load the user control or access any properties.
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May 19, 2010
Is it possible to dynamically (and generically) clear the state of all of a user control's child controls? (e.g., all of its TextBoxes, DropDrownLists, RadioButtons, DataGrids, Repeaters, etc -- basically anything that has ViewState)
I'm trying to avoid doing something like this:
foreach (Control c in myUserControl.Controls)
{
if (c is TextBox)
{
TextBox tb = (TextBox)c;
[Code]....
...but obviously that doesn't exist. Is there any easy way to accomplish this dynamically/generically?
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Mar 2, 2010
First, I would like to apologize, the search on the site wasn't working, so I don't know if I'm missing an existing post or not.
I have a web page that uses a master page file. I am using a third party control from Component One(TabStrip), the tabs are rendered as links on the final page. When a tab(link) is clicked, I need to load the appropriate web user control associated with that tab. Each web user control has its own post backs and methods. I know that I can load the controls on the "SelectionChanged" event of the TabStrip control, but then any postback created by the web user control that is loaded causes the page to refresh and the control was never loaded in viewstate. So, I tried to put my procedure of loading the web user control into the page_init method. This would work, if I could read which link was clicked on from within the page_init method. I tried using a javascript function to run "onclick" of the tabs and within it setting the value of a hidden control. I have verified that the javascript works and that the hidden control's value is getting set correctly. When I get into the page_init method, the value of the hidden control is not readable.
I'm tying to understand the page lifecycle to the fullest, but I don't see what I'm missing here. I know that I need to load the web user controls in the page_init method in order to persist the page as a whole, but how can I get which tab(link) was clicked to know which control should be loaded?
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Jan 30, 2010
I have a user control, which is added dynamically, but I have noticed that when it is on the page and viewing the source that none of the controls within have been given unique ids. How do I give my user control and the controls within unique ids in order that I can use them in my events?
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Jul 31, 2010
I have created a web user control (MemberDetails.ascx) which is loaded dynamically on a page (Member.aspx) for my website. The control has some TextBoxes. I want to store the values inputted by a user in these TextBoxes to a database on the click event of a button that is on the Member.aspx page (i.e. not a part of user control).
I'll use a small code for example.
Member.ascx page:
[Code]....
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Apr 16, 2010
I need some on techniques to perform page redirect in asp.net. Which one is more recommended to use in asp.net?
Dynamically changed the src of the Iframe to difference aspx.
[code]....
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Nov 1, 2010
It seems when I try to dynamically create multiple instances of a User Control, I get an Object Reference Not Set To An Instance Of An Object error on any ASP control that I'm using in that User Control
Here's the class where I'm creating them.
[Code]....
Am I able to successfully refer to a panel on the page that I'm calling this routine from simply by ByVal ... As Panel, or should I use HttpContext?
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