Controls and WebControls

Question

I can loop through the controls on a page and capture the HtmlForm control, then loop through the controls on the HtmlForm, and capture if a Control was of the types TextBox or Button, (which I'm interested in). What I want to do is use the Attribute.Add() method to add some client side functions to these controls, but a 'Control' doesn't doesn't recognise these although a WebControl does. Strangely though, no error is generated in Visual Studio.net on compilation, it's generated when th page is loaded in a browser, giving me a standard error page. So now I'm looking at a way of assigning the HtmlForm's child Control 'TextBoxes' and 'Buttons' as WebControl TextBoxes and Buttons so I can utiltise the Attributes.Add(string KEY, string VALUE) method. How do I get get a handle on these Controls as WebControls, or is there another way to iterate thru' all Controls on a page to do what I want???

Administrator · Answer

You can only do this if the controls are already on the page or are created at runtime by the code behind. I had this problem where I was creating controls on the client side using javascript but when I wanted C# to get them it couldn't find them at all. in the end I just ran through the innerHtml of the form part I use as a container using IndexOf. You can actually add methods and properties at runtime with javascript by creating an element from the HTML and then adding the attribute you want.

Administrator · Answer

for( int i = 0;i<Page.Controls.Count ;i++) { Control c = Page.Controls[i] ; if( c is TextBox) { c.Attribute[onclick] = ..../client side script/....; } else if(c is Button) { c.Attribute[onmouseover] = ....../client side script/...........; } } attention: c is TextBox equal to c.GetType() == typeof(TextBox) in here.