javascript - zebra striping rows in a flex container with flex-wrap:wrap -

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let's i'm using flexbox container flex-direction:row , flex-wrap:wrap.

depending on size of browser window, might have 2, 3, 4 or more items in each row.

i want put grey background in items in every other row, mimicking table layout. there easy way this?

example fiddle here: https://jsfiddle.net/mqf7nouc/1/

html:

<div class="container">   <div class="item">     item 1   </div>   <div class="item">     item 2   </div>   <div class="item">     item 3   </div>   <div class="item">     item 4   </div>   <div class="item">     item 5   </div>   <div class="item">     item 6   </div>   <div class="item">     item 7   </div> </div>

css:

.container {   display:flex;   flex-direction:row;   flex-wrap:wrap; }  .item {   height:50px;   width:100px;   text-align:center;   vertical-align:middle;   line-height:50px;   border:1px solid black;   margin:5px; }

okay, difficult task flexboxes. best way come use javascript find out wrapping happening looping through , comparing heights of items. currently, in self-executing function , run on window load. if want responsive when changes browser size after load put inside of function , call function on window resize.

otherwise here everything. 

(function() {     var x = 0;     var counter = 0;     var boxesperrow = 0;     var elements = document.getelementsbyclassname("item");     var totalboxes = elements.length;         // loop find out how many boxes per row         (var = 0; < totalboxes-2; i++){             x = i+1;             var temp = elements[i].getboundingclientrect();             if (x <= elements.length)             {                 var next = elements[x].getboundingclientrect();                     // compare height of current vs next box                     if (next.top > temp.top && counter ==0)                     {                          boxesperrow = x;                         counter = 1;                     }             }            }           // var marker applying style         // var countupto last box in row styling         const boxes = boxesperrow;         var countupto = boxesperrow;         var counter = 0;          // loop through , apply color boxes.         for(var marker = 0; marker < totalboxes; marker++)         {                if(marker < countupto)             {                 elements[marker].style.backgroundcolor = "red";              }             else             {                 counter++;                 if(counter === 1)                 {                     countupto = boxes*(counter+2);                 }                 else{                     countupto = countupto + (boxes*2);                 }                  marker = marker+boxes-1;                  // handles buttom row not being full set of boxes.                 if(marker> totalboxes && !(marker > totalboxes-(boxes*2)))                 {                      var leftover = marker-totalboxes;                      for(var c = 1; c <= leftover; c++)                     {                          elements[(totalboxes-c)].style.backgroundcolor = "red";                     }                 }             }         }      })();

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