disabled class code example
Example 1: disable whole div bootstrap 4
$("#mydiv").addClass("disabledbutton");
.disabledbutton {
pointer-events: none;
opacity: 0.4;
}
Example 2: css disabled
<input type="text" name="username" value="admin" >
<style type="text/css">
input[name=username] {
pointer-events: none;
}
</style>