By default, the javascript code selected by the first control on the page is

After a form is displayed on the page, the focus is usually not placed on the first control. You only need a common script to achieve this effect.
Document. forms [0]. elements [0]. focus ();
If the first control on the page is a hidden field, or the javascript above focus () is not supported, an error may occur!
Copy codeThe Code is as follows:
Var formutil = new Object;
Formutil. focusOnfirst = function ()
{
If (document. forms. length> 0 ){
Var item = document. forms [0]. elements. length;
For (var I = 0; I <item; I ++ ){
If (document. forms [0]. elements [I]. type! = "Hidden "){
Document. forms [0]. elements [I]. focus ();
Return;
}
}
}
}