javascript - Jquery change iside div width size, based on outside div size -

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hi change value of div width, based on outside div width

i new in jquery , javascript , tried code:

if ($('col-md-4 col-sm-6').width() <= 320 ){    $('.card-info').width(120px) };

but didn't work...

the html is:

<div class="col-md-4 col-sm-6">  <div class="card-info">  </div> </div> <div class="col-md-4 col-sm-6">  <div class="card-info">  </div> </div> (...)

could 1 me find out how that, change div "card-info" 120px width if div "col-md-4 col-sm6" 320px or less.

thanks lot.

you're not selecting col-md-4 , col-sm-6 class in jquery. missed dot(.) before $('col-md-4 col-sm-6') col-md-4 here , comma(,) , dot before col-sm-6. solution 

    if ($('.col-md-4, .col-sm-6').width() <= 320 ) {       $('.card-info').width(120);      }

or

        if ($('.col-md-4, .col-sm-6').width() <= 320 ) {           $('.card-info').css('width', '120px');          }

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