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12.28.2007 at 09:57AM PST, ID: 23047612
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8.2

Show a different image for disabled ImageButton

Asked by Russ_Suter in Microsoft Visual C#.Net, C# Programming Language, Visual Studio

Tags: , ,

I found a very nice sample online of how to enhance the ImageButton control with rollover effects (see attached code snippet) and it works very well for that. I now need to have the ImageButton control display a different image when it is disabled so the user can clearly see that it is disabled. I've tried the following:

        protected override void RenderContents(HtmlTextWriter writer)
        {
            if (this.Enabled == false)
            {
                Image disabledImage = new Image();
                disabledImage.ImageUrl = this.DisabledImageUrl;
            }
            else
            {
                base.RenderContents(writer);
            }
        }

(I added a DisabledImageUrl property to the class)

This does render the disabled image but it renders it right next to the regular image rather than in place of it. How can I modify this control so when the control is disabled it displays the image specified in the DisabledImageUrl property rather than the ImageUrl property?Start Free Trial 
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namespace CustomControls
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:RolloverButton runat=server></{0}:RolloverButton>")]
    public class RolloverButton : ImageButton
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string RolloverImageUrl
        {
            get
            {
                if (ViewState["RolloverImageUrl"] == null)
                {
                    return string.Empty;
                }
                else
                {
                    return ViewState["RolloverImageUrl"].ToString();
                }
            }
            set
            {
                ViewState["RolloverImageUrl"] = value;
            }
        }
 
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            writer.AddAttribute("onmouseover", "this.src='" + base.ResolveClientUrl(RolloverImageUrl) + "'");
            writer.AddAttribute("onmouseout", "this.src='" + base.ResolveClientUrl(ImageUrl) + "'");
            base.AddAttributesToRender(writer);
        }
    }
}
 
Keywords: Show a different image for disabled Im…
Title
1 Enlarge ASP.net imagebutton in popu…
2 Dynamically add ImageButton to repeater
3 asp:ImageButton Rollover
4 imagebutton as an href
5 ImageButton
6 ImageButton with rollover effect
 
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[+][-]12.28.2007 at 11:57AM PST, ID: 20544615

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About this solution

Zones: Microsoft Visual C#.Net, C# Programming Language, Visual Studio
Tags: disabled, image, imagebutton
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Solution Provided By: GreenGhost
Participating Experts: 1
Solution Grade: A
 
 
 
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