Update ValidationSummary list on control blurs?

Question

A ValidationSummary will show a list of errors on postback. As each field is fixed, it\'s validator is fired, and any validation text will disappear. I want to

Answer 1

Here's a server-side approach to get the onblur attribute on all TextBoxes (which should also work with Validation Groups):

• Create a class derived from TextBox, e.g., TextBoxEx
• Add the attribute in this derived class e.g., this.Attributes.Add("onblur", string.Format("ValidationSummaryOnSubmit('{0}')", this.ValidationGroup);
• Use tag mapping so that all of your existing <asp:TextBox> tags will still work: <system.web> <pages> <tagMapping> <add tagType="System.Web.UI.WebControls.TextBox" mappedTagType="MyControls.TextBoxEx"/> </tagMapping> </pages> </system.web>

Another way would be to use ControlAdapters to add the attribute.

Relevant links:
Understanding ASP.NET Validation
MSDN - tagMapping Element for pages