'Add class on input focus

Here my solution: Add class on input focus and remove if country change

    el.addEventListener('countrychange', function() {
        let $this = $(el);

        $this.inputmask('remove');
        $this.val('');
        $this.removeClass('mask-added');
    });

    $(el).on('input', function() {
        let $this = $(el),
            placeholder = $this.attr('placeholder'),
            mask = placeholder.replace(/[_]/g, '9');
            
        if(!$this.is('.mask-added')) {
            $this.val('');
            $this.inputmask(mask);

            $this.addClass('mask-added')
        }
    });

This works for me



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Source: Stack Overflow

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