Use the "onblur" event. For example:<HTML> <BODY> <P>Click on each textbox to move focus from one to the next.<BR> An alert will display each time the <B>onblur</B> event fires.</P> <INPUT TYPE=TEXT NAME=txtFirstName VALUE="First Name" onblur="alert(event.srcElement.name)"><BR> <INPUT TYPE=TEXT NAME=txtLastName VALUE="Last Name" onblur="alert(event.srcElement.name)"><BR> <INPUT TYPE=TEXT NAME=txtPhoneNumber VALUE="Phone Number" onblur="alert(event.srcElement.name)"><BR> </BODY> </HTML>
For example:<HTML>
<BODY>
<P>Click on each textbox to move focus from one to the next.<BR> An alert will display each time the <B>onblur</B> event fires.</P>
<INPUT TYPE=TEXT NAME=txtFirstName VALUE="First Name" onblur="alert(event.srcElement.name)"><BR>
<INPUT TYPE=TEXT NAME=txtLastName VALUE="Last Name" onblur="alert(event.srcElement.name)"><BR>
<INPUT TYPE=TEXT NAME=txtPhoneNumber VALUE="Phone Number" onblur="alert(event.srcElement.name)"><BR>
</BODY>
</HTML>