Web Forms :: How To Render Control Dynamically Based On Configuration
Mar 25, 2010
I have come across a requirement to dynamically show or hide asp.net web controls , html server controls. I want to do this through a configuration XML (as it would be easier to config). So each page /aspx will have a configuration xml.
Would it be possible to create a control (may be a custom control , to which i can attach the xml file). The control (lets says - call it sequencer) should decide which control should be ordered in which order and if the control has to be shown or not. Ideally this sequencer control should use the page events and take decision on rendering the child controls.
We have an application where the controls are dynamically added to the form based on the logged in user,
This user controls related data is stored in the database. There is lot of logic in the code behind in the asp.net webforms which is so messy to maintain it, we are planning to re-write it using the MVC framework.
I would say there would be rougly 50 different forms based on the user logged in, is it good idea to create so many views and redirect to the appropriate view based on the logged in user, in some of the forms there might be minor difference like the order of the Control might change.
Im working with asp.net web application,I need to get multiple gridviews dynamically based on the count (which i get from database) for that i took a web user control and i added a gridview there . iwant to load that usercontrol in aspx.cs based on the count..
What I'm trying to do is take an instance of a control, and figure out what the markup would look like based on the property values set in the code behind. We've built a web-based web form designer. At the end of the design process we save the markup. For simple controls with supported types, generating the markup was easy. For complex controls with nested properties or unsupported types, we're faced with creating a custom markup generator for each custom control. I was hoping to find info out there that would jump start this development effort.
In simple terms, I have this:
Dim Ctl as Control = CType(Asm.CreateInstance("MyNameSpace.MyControl"), Control) Ctl.Name = "Name of my control"
And I want to end up with this:
<cc1:MyControl ID="MyControl1" runat="server" Name="Name of my control" />
I've been watching a video on Scott Hanselmnn teaching MVC 2 tricks/tips. He mentions how MVC 2 by default uses ASP.NET Web Forms view engine to render the output of the views; he mentions that the web forms view engine is a little slower than it could be for MVC 2 since it generates a control tree and then outputs the HTML to the page (I hope I said that right).
I was wondering what he meant by web forms generating a code tree before outputting the HTML to the page. Does anyone have insight on the view engine of Web forms and the steps of the rendering process works for ASP.NET and MVC2?
My plain texts are image links and pdf URLs from a database table, in groups, in the correct order but I'm not sure how to render them correctly (sample image below shows what I am trying to render)
Is there any way to make a repeater template intelligent enough to render an "image link" OR "pdf link" based off the [type] column returned in the record?
table: pk Name Type (image or pdf) URL Description URL_Thumbnail (if image) GroupId (associate these records to each other) OrderNumber (order of these records within their GroupId)
i'm trying to develop a ASP.Net control. If it based on System.Web.UI.Control id doesn't work correctly with Ajax.Net updatePanel. If I change it to System.Web.UI.WebControls.WebControl the it works fine with Ajax controls. What is the difference between them and how I implement it on Control based Control?
I want to know that how to render partial view based on where the user navigates. I mean to say if user navigates to Home/index it will load different partial view and if user navigates to Home/contact it will load different partial view on the _layout page.
Let's say I have a string that I retrieve from a DB like: "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et {{Hyperlink|navigateurl='/foo.aspx'}} dolore magna aliquyam."
This string may now get assigned to the Text-property of a label. What I want is to parse {{Hyperlink|navigateurl='/foo.aspx'}} and replace it with
and assign the whole text including the HyperLink-Control to the Label.
Is that even possible? I think I could use reflection to create the control and set the properties. (the HyperLink-Control was just an example) But can I manage to insert the asp.net control back into the string to ensure the hyperlinks rendering as server contorl?
I hope you understand what I want. If not, feel free to post comments.
Edit1:
what do you mean by "assign the whole text including the HyperLink-Control to the Label."? can you xplain a bit, the reason for doing so ?
I think it won't work to assign the control into the string, because a asp.net control cannot be fit into a string.
After some thinking I found a way to achieve my goal. That would be to create a placeholder (I name it A). Therein some Literal control will be added. In addition I would create a placeholder (I name it B), add my Hyperlink into B, and add A into B. But I think is way to overkill.
The reason why I started thinking about this, was to gain access to Server.MapPath without replacing occurences in the string. I want to be able to use relative paths in my CMS, that get rendered like the NavigateUrl property from a hyperlink. Nevertheless I think my question with the dynamically creation is worth thinking about
way to read xml from a database and then dynamically render out the node name in text and the node value in a checkbox/textboxI want to be able to edit the values and then save it back to the database.I know that you can use serialize the xml to a class object but that only works when you know how the xml looks like.. if im not mistaken?
I have a complicated user control on a form that's laid out they way the business unit wants it. What they would like is to be able to export this content to excel and/or PDF as an image. Basically I need to be able to render the user control as a static image.
Is there any simple way to do this or is it even possible? Since the user control is HTML, it's not really rendered at all at the server level as it's just HTML, so I would assume that I might need to interface with IE library.
I want to render a user control in pagemethod and return the html back to client. But its getting annoying, I tried like many ways but nothing found working. The problem is that, the usercontrol require both HtmlHead and ScriptManager.
I tried this but it doesn't work(raise error : ScriptManger require in page) because ScriptManager must be inside HtmlForm but Page.Form always null.
I am using web user control and making it visible false initially (page load) and on the selection of checkbox i am making it visible true. user control html is missing when i load it on checkbox selection. is there any when that i rebind the complete form again on checkbox selection so that user control html should be rendered.
i am really struggling to solve this issue since last two days.
We have some reports that are loaded on a asp.net webpage via the localreport.render() and a request has come in to hide a logo image if it is displayed inline as html on the page and only show the image if it's rendered as a pdf.
is there any way to determine the render mode in the report so i can create an expression to set the display property to hidden for the logo image if it's not pdf mode?
Would adding "X-UA-Compatible: IE=EmulateIE7" as an http header to trigger IE9 to render in compatibility mode negatively affect performance on the server? I made the change today, adding it, but now some areas of our site are behaving sluggishly, though we did have a large number of changes come in overnight. I know that we can't single out this as the problem, but my boss seems to think it is.
could u tell me add controls to a page base on user inputs,
i know the basic of creating a button dynamically but here I have to to add few controls based on user input and how to identify event for each dynamically create control.
