Web Forms :: How To Add Controls To Page Programmatically And Validate Against Them
Feb 25, 2011
Im using vb.net 3.5, ajax, sql 2005, been programming a while but still consider myself a novice an need some advice. Im building a cms type tool for a knowledge base. And on one of the web forms i need to be able to allow the user to add a set of controls each time they click on a button, the controls they add will be fixed, a set of 3 textboxes. I then need to be able to run a for each loop to check that they have populated the textboxes before running an insert via the tableadapters insert method.
I have little strange question. I would like to Validate my Page Controls on the button click which is there in the User Control. This user control is placed on the Page. If I check Page.IsValid property on button click event, it returns false. But Validation Summary message doesn't popup. So user doesn't know what's happening. It will not save the information and it won't give the validation message too.
Given a gridview has 10 pages comprising of 10 records/page, how do I programmtically select a particular page in the code behind ? For instance, I'd like to set page 5 as the current page of the gridview during databind. I do not have any codes at this stage but this is what I'd like to achieve.
I need a way to change the ActiveViewIndex of a multiview control based on some query results. Right now I test to see if I have rows returned from my linq query. If so, set a certain view active. If no rows are returned, I would like to set a different view active. I would like to do this on Page_Load if possible.
Right now I get the fatal "Object reference not set to an instance of an object" error on page load with it bombing at line 12. My count is given a value at runtime so that is not the issue. Can anybody tell me why this is and how to get around it. Code is attached.
I also tried this both the pre render and Page_Init event but both yielded the same behavior with the Object reference not set to an instance of an object error. I can do this just fine in an onclick event for a button, but now I need a way to run a test and set the default view when the page loads. Seecode below
protected void Page_Load(object sender, EventArgs e) { eCrystalPSGDBDataContext psgDB = new eCrystalPSGDBDataContext(); int count = (from st in psgDB.studyTbls where st.patientid_i == Convert.ToInt32(Request.QueryString["PatientId"]) && st.studystatusid_i == 1 select st).Count();if (count == 0)else if (count == 0) { StudyInfoMultiView.ActiveViewIndex = 1; } else { StudyInfoMultiView.ActiveViewIndex = 2; } }
I have a web page where I only want controls to appear under certiain conditions. I know I can set the visible property to false but it still takes up space on my page, and I would like to take it out completely. Is there a setting to do this? I have tried Controls.Remove(Button1); but this code doesn't seem to work.
I have designed a page where user can write messages and send within a group but i want that if they enter any special character like <>?#@ etc a msg should be displayed irrespective of the crashing of the page.
I am programatically adding a control to an aspx page and binding a server side event to an index changed event inside the control. (It's a RadListBox from Telerik's ASP.NET controls) The problem is that on the postback triggered from the control, the event doesn't hit its eventhandler because on the postback the control isn't defined. Is there a way to handle this without having to retrace the logic taken before and rebuild the controls so the events that stem from it are processed?
I am trying to add a user control into a div at runtime. I can add the control no probelem but it overwrites the previous control added.Basically, I am trying to add passengers to a travel system - the passenger details are in the user control and I don't know in advance how many there will be. I have an add new passenger button which should append the new user control into the div without overwriting the previous passenger. The code is c#/.net 4. I have tried to save the control data into viewstate and re add it with the new one but that also doesn't work. Here is a snippet of the code I'm using
foreach (Control uc in p_passengers.Controls) { Passenger p = uc as Passenger; if (p != null) { p.SaveValues(); } }
however, p.SaveAs() (just writes the control values into ViewState) is never hit.
There are two pages in a survey project. A submit button is in pageB. Before cliking submit button, I need to add code in pageB to validate data in pageA.
I have a two textboxes on the same page with their corresponding buttons to enter the data and both the textboxes require validation.
The problem is that if any of the two buttons is clicked it causes client side validation. What I want is only corresponding button shud cause validation.
I can test the application locally and it works. But once I publish the application on my IIS6 web server the PDF does not generate or output. Is it a PDF Mime problem? What is causing the application not to output the pdf once it goes to production. My IIS6 has Adobe Reader and I added the PDF Mime.
I have code to add a control to page in Init event. I hit error "The control collection cannot be changed during DataBind, Init, Load, PreRender and Unload phrase".
The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
I need to post data from my asp.net page to a non-asp.net page that is offsite. How can I do that without redirecting to that page? IE: not using a button's PostBackUrl property.
Can i run all validators when page is loaded. I need to show * in all input text fields that are necessary. I have require field validators for that fields, can i run it by default when page is loaded?
I would like to programmatically access a div in a style sheet for my master page and change its height value depending on the content page loaded.
Can this be done using Javascript in the Master page or in the code behind for the respective page? What I would like is something such as this if possible
When this content page loads, change the height value of this div in the css file
I don't want to use separate Master pages as this seems to defeat the whole purpose of the Master page
I have an asp.net app that allows users to create personal pages which can be publicly accessed thru a "directory" page. The content of the pages is stored in sql server, so a given user's page is dynamically created thru the code that executes when the relevant link on the directory page is clicked.
I would like to take this a step further by allowing access to a given user's page directly thru the browser's address bar, something like www.thegreatestsite.com/jim (pretty much like You Tube, Facebook, etc.).
I could achieve this by manually creating a folder under the root, called "jim" and putting a default.aspx page in it which would have code in it's load event that would dynamically create jim's page.
However, I would like this "additional feature" to be created automatically, as part of the sign up process of the user.
