[2008] Lost Focus on Text Box

[jsc0624]

Hi Guys,

Anyone here knows how to program this:
For example I have a textbox asking for a name, and automatically after I have entered my name and lost my focus on that textbox it will automatically check the database if my name does already exists or not?

Thanks in advance!

By the way I am using ASP.NET and C#.

[Pradeep1210]

You could use Javascript (or AJAX) to postback to the page on the javascript onblur event of the textbox.

[jsc0624]

I am not good at javascript is there anyway to use c#.

[mendhak]

I think you'll have to take the plunge and learn javascript for this, users are not going to appreciate the sudden postback that occurs without their consent.

It's not as difficult as you think - have a look at ASP.NET AJAX. You'll probably need to define an UpdatePanel and have your code call a method on your page which in turn uses C# to check the database. Your C# method will return a value to the javascript and the javascript can then use that value to determine what to do next - warn the user, for example.