Change content of Input Field when checkBox is checked

i want to change the content of my Searchbox when the checkBox is checked.

So i got following checkboxes:

<li><label style="margin-left:20px">Bars:  <input type="checkbox"></label><li>
<li><label style="margin-left:20px">Clubs:  <input type="checkbox"></label><li>

And this is my input field "Searchbox"

 <input id="pac-input" class="controls form-control" type="text" placeholder="Search Box">

When no checkbox is activated the SearchBox is clean.

Iam searching for a possibility to change the content of my checkbox to Bars when the Bars checkBox is activated and i want to change it to Clubs when Clubs checkBox is activated.