ALT text not encoded

Valid for Sitecore 5.3

The content of an Image field’s ALT text is not HTML encoded when the Web or XSL Image Control are used. If the provided ALT text contains invalid characters, the generated HTML is not valid.

Workarounds:

For a Web control:

<sc:Image id="imageControl" Field="Image" runat="server" />

Encode the Alt text with the following code:

      public void Page_Load(object obj, EventArgs eventArgs)
    {
        if(!IsPostBack)
        {
            var imageField = Sitecore.Context.Item.Fields["image"];
            if(FieldTypeManager.GetField(imageField) is Sitecore.Data.Fields.ImageField)
            {
                string altText = ((Sitecore.Data.Fields.ImageField)imageField).Alt;
                imageControl.Alt = HttpUtility.HtmlEncode(altText);
            }
        }
    }

For XSL control:

In the xsl rendering file, replace the <sc:image ... /> tag with the code similar to the following: