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Old June 22nd, 2007, 05:29 AM
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Default Custom Radio Button

Hi all, I got the following code on a forum. But I dont know how to use it in my code. Help!!!

public class MyRadioButtonList : RadioButtonList

        private string HiddenValueFieldName
                return this.ClientID + "_theValue";

        private string DivArrayName
                return this.ClientID + "_theDivs";

        protected override void OnPreRender(EventArgs e)

            string script = "";
            script += "function setValue(theDiv){";
            script += "document.getElementById('" + HiddenValueFieldName + "').value = theDiv.getAttribute('value');";

                script += Page.ClientScript.GetPostBackEventReference(this, "", false);
                script += "theDiv.style.backgroundColor='gray';";
                script += "for(i=0;i<" + DivArrayName + ".length;i++){";
                script += "var theVal=" + DivArrayName + "[i];";
                script += "if(theDiv.getAttribute('id') != theVal)";
                script += "document.getElementById(theVal).style.backgroundC olor='white';";
                script += "}";

            script += "}";
            Page.ClientScript.RegisterStartupScript(this.GetTy pe(),"setValue",script,true);

            //register the hidden field
            Page.ClientScript.RegisterHiddenField(HiddenValueF ieldName, "");

            //register that LoadPostdata will be called even if control's UniqueID is not on post data collection

            //this is playing for the client-side color selection :-)
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            foreach(ListItem litem in this.Items)

            string s = sb.ToString().TrimEnd(',');
            Page.ClientScript.RegisterArrayDeclaration(this.Cl ientID + "_theDivs", s);


        protected override bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
            //wrap the existing loading logic to get the LiostItem value from our hidden field
            return base.LoadPostData(HiddenValueFieldName, postCollection);

        protected override void RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)
            //render the thing out as a DIV
            ListItem item=this.Items[repeatIndex];
            writer.AddStyleAttribute(HtmlTextWriterStyle.Borde rWidth, "1px");
            writer.AddStyleAttribute(HtmlTextWriterStyle.Borde rColor, "black");
            writer.AddStyleAttribute(HtmlTextWriterStyle.Borde rStyle, "solid");

            writer.AddAttribute(HtmlTextWriterAttribute.Value, item.Value);
            writer.AddAttribute(HtmlTextWriterAttribute.Onclic k, "setValue(this)");
            writer.AddAttribute(HtmlTextWriterAttribute.Id, this.UniqueID + this.IdSeparator + item.Value);

            if (item.Selected)
                writer.AddStyleAttribute(HtmlTextWriterStyle.Backg roundColor, "gray");



- Vishu
- Vishu
Old June 26th, 2007, 01:46 AM
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Well, I don't "think" it's an issue, but this is in C# which I'm less familiar with.

In principle though, what you have is the code for a custom class description. Just make the code available to your application (the part I'm a little fuzzy on), and in your VB code behind...

Dim Whatever As New MyRadioButtonList
That will create an instance of the list that you can program against. Alternatively, if you're working in C# yourself, you may be able to include the class description code directly in your code behind file. But I don't know the syntax for C#.

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