ASP.NET Control Custom Attribute

[Ahmed Galal]

am just trying to add a custom attribute with the id of what he wrote in the TextBox in a custom attribute, i know i could use hidden field and it would work just fine, but am tryin to look for a clean clean solution, and also wondering why it doesnt work.. thanks for reply

[Not Active]

How are you trying to access the attribute? txtUserName.Attributes["myAttr"] Perhaps if you showed a snippet we could see a problem.

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I know the language. I've read a book. - _Madmatt

[Ahmed Galal]

yes exactly, and it doesnt work :S and as i said before, if i tried to change any of the control attributes like value it works fine, i assume that the ViewState doesnt save my new custom attribute, dunno whats wrong .. i'm using .net 4 but i also tried on .net 2.0, and its the same. thanks for ur time

[Arun Jacob]

Ahmed Galal wrote:

when i try to change this attribute from javascript and then read it in the code-behind, i dont get the changes,

Yes,you won't get it from code behind.

Ahmed Galal wrote:

however if i changed any of the other control attributes like value, it works just fine.

If you change attribute value from javascript you'll get that change in code behind because its an input control type.

Arun Jacob http://codepronet.blogspot.com/

[Ahmed Galal]

am just trying to figure out a way that could make it work, u think theres no way to read my custom attributes in code-behind ? or by any chance i could render this attribute to the ViewState or making it a control attribute like the others ? i think i will go for the hidden fields if i failed on this. thanks again

[Arun Jacob]

Ahmed Galal wrote:

i think i will go for the hidden fields if i failed on this.

I think this is the solution.

Arun Jacob http://codepronet.blogspot.com/

[Not Active]

You would need to create a custom control that inherits from textbox. It does't matter if tis 4.0 or 2.0

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I know the language. I've read a book. - _Madmatt

[Arindam Tewary]

You can create your own text box control( a custom user control and can append the properties ) Is that you strictly want to write that in ???

public partial class CustomTextBox : System.Web.UI.UserControl
{
String sSampleData = String.Empty;
protected void Page_Load(object sender, EventArgs e)
{
if (this.sSampleData == "")
{
Page.Response.Write("No data set");
}
else
{
Page.Response.Write(this.sSampleData);
}
}
public String MyAttribute
{
set { sSampleData = value; }
get { return sSampleData; }
}
}

<form id="form1" runat="server">
<ADT:TextBox ID="aa" MyAttribute="Its working" runat="server" />
</form>

1. The equivalent .NET class of is pre-written and you can not modify that. hence you can not add an extra "attribute" the way you have been trying to do. 2. When an attribute is added in following way

TextBox1.Attributes.Add("onclik","something");

it is added to rendered control's attribute collection. These two attribute are different things. Thats why what you write in "design" view, after rendering you see different things.( asp:dropdownlist changes to select/option , asp:datagrid changes to <table > etc.

Thanks, Arindam D Tewary

modified on Wednesday, April 7, 2010 9:13 AM

[Ahmed Galal]

yea that would work although i was looking for a simpler method, i think hidden field is the way to go unfornatually, but thank u very much for answering.

[Ahmed Galal]

your right it shouldnt differ between framework versions, i just doubted myself that they changed the way of rendering control or somethin. thanks again.