We can use autocomplete attribute on form fields and set it to off.
so in any our custom module implement hook_form_alter and code inside will look like
Disable on complete form.
function my_module_name_form_alter(&$form, &$form_state, $form_id) {
// Add form id condition to disable it on specific forms.
// else this will disable autocomplete on all forms.
$form['#attributes']['autocomplete'] = 'off';
}
The above code will disable autocomplete on complete form for specific fields use.
Disable on specific field.
function my_module_name_form_alter(&$form, &$form_state, $form_id) {
// Add form id condition where your field is present.
$form[<field_name>]'#attributes']['autocomplete'] = 'off';
}
Or it can be done by jquery code
Disable autocomplete on each input field by jquery.
$('input').attr('autocomplete', 'off');
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