$('.js-input').focusin(function() {
$('.js-checkbox').prop('checked', true);
}
$('.js-input').focusout(function() {
var inpVal = $(this).val();
if(inpVal==''){
$('.js-checkbox').prop('checked', false);
}
}
<div class="item">
<div class="img"></div>
<div class="text">34534534534</div>
</div>
.item .text{
position:relative;
}
.item .text:before{
content: '';
position: absolute;
left:-8px;
top: 20px;
width: 0;
height: 0;
border-right: 8px solid #000000;
border-top: 8px solid transparent;
border-bottom: 8px solid transparent;
}