ASP.NET

ASP.NET 2.0 - Adding controls at runtime?

16-Oct-06 14:10

The id of controls inside containers, like in master pages, gets the id of the container prepended to it. Check the source of the html page to see what the field's names are.

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wbjohnson16-Oct-06 8:33

wbjohnson

16-Oct-06 8:33

Hey guys i have a small problem.... im sure you can help

I have a new project, with 2 buttons on Button1 and Button2... The code behind button1 is simple:

Textbox t = new Textbox();
t.Text = "hello world!";
form1.Controls.Add(t);

when i click Button1 - wow! it adds the control! No problem, i noticed that i can click the button as many times as i want and only 1 textbox ever appears. so Click button1, then click Button2 - POW! its vanised!

Whats the correct method of keeping a control "alive" on a page (as well as preserving any events it has?)

Cheers

Will

Member 9616-Oct-06 9:07

16-Oct-06 9:07

I'm not an expert by any means on this, however I believe it might have to do with the point at the page event lifecycle when you create the controls. From what I understand any dynamic controls should be created very early in the page lifecycle and I use the Page_Init event always for dynamic controls and have had no problems with them. However I did have problems when trying to create them on page_load.

Guffa16-Oct-06 9:45

16-Oct-06 9:45

You shouldn't have any problem with adding controls in Page_Load. The Page_Init didn't event exist in framework 1.x.

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Member 9616-Oct-06 10:27

16-Oct-06 10:27

Right, although they do recommend Page_Init and some 3rd party components I'm using require that as well because if you create them any later you don't get their values properly from viewstate.

http://support.microsoft.com/kb/317515

Guffa16-Oct-06 11:37

16-Oct-06 11:37

Yes, for some reason that is not revealed, it says that Page_Init is the best place for it, but it also says:

"When you create dynamic controls on a Web Form, you must create the controls and add them to the controls collection in either the Page_Init event handler or the Page_Load event handler."

So, either works for dynamic controls.

If some controls need to be created in Page_Init, it's because how they are built, not because you create them dynamically.

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Member 9616-Oct-06 12:03

16-Oct-06 12:03

No, I looked a little deeper into it and you *must* create them in Page_Init if you want their viewstate to be restored properly because the event that loads viewstate into the controls occurs before Page_Load but after Page_Init.

Guffa19-Oct-06 20:18

19-Oct-06 20:18

Are you sure? Has this changed between framework 1.1 and framework 2.0? Otherwise it would be impossible to use dynamic controls in framework 1.1, as there is no Page_Init.

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Member 9620-Oct-06 4:11

20-Oct-06 4:11

Maybe it's changed, not sure, I never used .net 1.x with asp.net, but that's been my experience with asp.net 2.0 and that's what Microsoft detailed on the page I found at the time when I looked it up on MSDN.

I use dynamic controls for a custom fields section on many of my forms and if I don't create them in page init then I can't retrieve their values later on in the page lifecycle.

Guffa16-Oct-06 9:21

Requested Clipboard operation did not succeed

16-Oct-06 9:21

Every postback produces a completely new Page object, so to make a dynamically created control stay on the page, you have to recreate it on every postback.

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Runtime in Asp.Net 2.0

shapper16-Oct-06 6:27

shapper

16-Oct-06 6:27

Hello,

When I create a web site I usually create an .aspx and an .aspx.vb file
for each page.
However, I create all my page code in my VB code at runtime.

What I would like to know is:
Is there a development model where the Aspx pages (.aspx files) are
also created at runtime.

If yes could you tell me if should I do it?

Can you give me any advice on creating everything at runtime in my VB
or C# code?

Thanks,
Miguel

ampk16-Oct-06 5:40

ampk

16-Oct-06 5:40

hi!i have a problem for following code.
when i use this code in win-2000 server then there is no prblem
System.Windows.Forms.IDataObject clipboardData = System.Windows.Forms.Clipboard.GetDataObject();

but when try to execute this code in win-server 2003, then follwing exception is throwned

ex = {"Requested Clipboard operation did not succeed."}

please give me solution.

Amit Kuamr Pandey

On DIV tag

sribachana16-Oct-06 4:22

sribachana

16-Oct-06 4:22

I have an image inside a DIV tag.When i click the mouse in a IE browser,at the particular position of mouse click,i need to display the DIV tag's image.

I have captured the coordinates of the mouse click.
HOw to set the X,Y coordinates to the image i have taken inside the DIV tag using javascript.

Re: On DIV tag

Mike Ellison16-Oct-06 5:54

Mike Ellison

16-Oct-06 5:54

You can declare your div for absolute positioning:

div {position: absolute; top: 100px; left: 100px;}

and then change its position with something like this:

var e = document.getElementById("myDiv");
e.style.left = 110;
e.style.top = 110;

Re: On DIV tag

Mike Ellison16-Oct-06 6:47

Mike Ellison

16-Oct-06 6:47

Here's a more fleshed-out example:

<html>
  <head>  
    <style>
      div.myDiv {font-size: 10pt; font-family: Tahoma; 
                 border: 1px solid #999999;
                 background-color: yellow;
                 width: 18px; height: 18px;
                 position: absolute;
                 text-align: center;
                 vertical-align: center;  
                 font-weight: bold;         
                 color: darkBlue;      
                 }
                 
    </style>  
    <script>
    function findPos(obj) {
	  var curleft = curtop = 0;
	  if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	  }
	  return [curleft,curtop];
    }         
      function MoveDiv(x, y)
      {
          var div = document.getElementById("MyDiv");
          div.style.left = x;
          div.style.top = y;
      }
      
      function MoveToButton(btn)
      {
        var pos = findPos(btn);
        var width = btn.offsetWidth;
        var height = btn.offsetHeight;
        var x = (width / 2) + pos[0];
        var y = (height - 6) + pos[1];
        MoveDiv(x,y);
      }
      
    </script>
  </head>
  
  <body>
    <h3>Testing a client-side element move</h3>
    <p>Div defined below:</p>
    <div id="MyDiv" class="myDiv">
      @
    </div>
    <br /><br />
    
    <hr />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
    <br /><br />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
    <input type="button" value="Click to move it here" 
           o n c l i c k = "MoveToButton(this);"
           />
               
    <br /><br /><br /><br />
    <a href="#";
       o n m o u s e o v e r = "MoveToButton(this);"
       >MouseOver move</a>
     
    <a href="#";
       o n m o u s e o v e r = "MoveToButton(this);"
       >MouseOver move</a>
    
  </body>
  
</html>

include aspx in anotherasp

mamatha_raghu16-Oct-06 3:33

Re: include aspx in anotherasp

16-Oct-06 3:33

hello

like i have one aspx/asp page which iam using in my many anither pages so i don't want to write all the stuff every time how can i do this?
i tried with
its not working

and i also tried with
response.writefile("file.aspx")
its working but i want to use some functions of file.aspx page in my present page -----------its throwing an error there because it adds the file at run time and the function in it has not declared before

so how can i do this

can any one suggest me ------------

Andrei_KS16-Oct-06 5:11

Andrei_KS

16-Oct-06 5:11

Hi,
I think you must use ASP.NET User Controls (*.ascx)

!include aspx in anotheraspx

mamatha_raghu16-Oct-06 3:31

16-Oct-06 3:31

_AK_16-Oct-06 18:43

16-Oct-06 18:43

You have to create user controls for that purpose. They are just like your aspx pages and you can drag and drop to any page you want. The extension for that is ascx.

Best Regards,
Apurva Kaushal

mamatha_raghu16-Oct-06 19:03

16-Oct-06 19:03

but i have "response.write" stmts in my page how can it work

any other way?
can any one send me one example?

_AK_16-Oct-06 19:19

16-Oct-06 19:19

It does not matter. What you need to do is first create a ascx page(User control). Same as you create a aspx page and then drag it from solution explorer to you web page(aspx page) and that over. You can get the contents of the control to the page. Smile | :)

Best Regards,
Apurva Kaushal

mamatha_raghu16-Oct-06 19:50

16-Oct-06 19:50

thanks alot for a very fsater reply

but still iam getting prob because i have some functions in my first page which are having response.write stmts ok and i want to use these functions in my second page.........iam getting reference error

thanks in advance

_AK_16-Oct-06 20:06

16-Oct-06 20:06

I am not been able to understand your because i dont think there is any relation between your user control and response.write statements. What is the exact error message and you debug the code and see where which part is diaplaying the error.

Best Regards,
Apurva Kaushal

mamatha_raghu16-Oct-06 21:08

16-Oct-06 21:08

hai apurva

let me explain what i need exactly

ihave one.aspx page ok in that i have written some functions to display some table of content ok
for example...
in my one.aspx ihave a function like...

function disp(pagesize,query...etc)
(iused record set of adodb here to fech the table from param query passed ok)

response.write("")
(taken loop to display)
response.write(")
and so on.

now i want to use this function in my second.aspx
i think now it is clear

thanks

recods that feched from table

_AK_18-Oct-06 21:02