Application Items and JavaScript

Get the value

var val = $v("P10_NAME");             // shortcut
var val2 = apex.item("P10_NAME").getValue();  

Set the value

$s("P10_NAME", "New Value");          // shortcut
apex.item("P10_NAME").setValue("New Value");

Other operations (JS API)

apex.item("P10_NAME").disable();
apex.item("P10_NAME").enable();
apex.item("P10_NAME").isEmpty();