Bootstrap media object cannot align properly -

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i using bootstrap 3 media objects , have code here dynamically want have 4 columns in 1 row,but problem last row have spaces inbetween second row. here code.

//content.php

for(var i=0;i<12;i++){                 mymdedia+=                     '<div class="media col-sm-3">'+                       '<div class="media-left">'+                          '<a href="#">'+                             '<img src=".....">'+                           '</a>'+                       '</div>'+                          '<div class="media-body">'+                              '<h4 class="media-heading">'john doe'</h4>'+                              '<p>live: '+data[i].address+'</p>'+                            '</div>'+                     '</div>';         }     $('#mycontainer').append(mymdedia);

//index.php

 <div class="someclass">                   <div class="row" id="mycontainer">                    </div>             </div>

and result looks like

enter image description here

i believe placing media objects in 1 row ... , don't fit.

in every row you've opened ( <div class='row'>...</div> ) can place 4 <div class='media col-sm-3'></div> ... because each col size = 3 ... ( 4x3 = 12 )

so in for loop, after each 4 media objects - should close current row div , create new <div class='row'> ...

see plunker: http://plnkr.co/edit/bja3qdbkcymdwhw809gp?p=preview

right after loop:

for(var i=0;i<12;i++){     if ( && % 4 == 0 )       mymdedia += '</div><div class="row">';    // close row , create new 1       ... original code ...  }  mymdedia += '</div>' // close last row outside loop ...

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