test.aspx.cs Search.Attributes.Add("onkeydown","return confrm();");
test.aspx
<script> function confrm() {
if(event.keyCode==13) { if(Form1.Search.value=="") { alert('检索不能为空'); Form1.Search.focus(); return false; } document.all.Button2.click(); return false; } } } </script>
