javascript - Scale Background CSS with Slider -

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i working css backgrounds (http://css3pie.com/demos/gradient-patterns/) in application , want able scale design slider. here's jsfiddle. able scale x & y separately on stripes , picnic designs had play background-size:50px 50px; this:

//setup variables based off css set using dropdown griditems = $(document.activeelement).val().split("; "); (i = 0; < griditems.length -1; i++) {     gridsettings = griditems[i].split(":");      if (gridsettings[0]=="background-size"){         gridsize = gridsettings[1].split(" ");         gridx = gridsize[0];         gridy = gridsize[1]         }    //on action of slide - update value     $('#gridxy-'+key).on("slide", function(slideevt) {         gridxy = slideevt.value;         $('.draggable-' + currentlayer).css("background-size", "calc("+ gridx +" * "+ gridxy +") calc("+ gridy +" * "+ gridxy +")");     });

which can set either numerically or using when gets blue print has lot more settings background-size:100px 100px, 100px 100px, 20px 20px, 20px 20px;

i trying right can take variable number of those, , can write work, method have in mind messy, hoping scaling might little cleaner do.

i did find this:http://codepen.io/erik/pen/jgnsb using less declare variables, if possible stay away that.

update: here jsfiddle of it: http://jsfiddle.net/4l3d9qh2/

i added function should have let me update it, reason calc() function doesn't seem working update div style. after processing, looks this: $('.draggable-0').css("background-size", calc(100px - 4) calc(100px - 4), calc(100px - 4) calc(100px - 4), calc(20px - 4) calc(20px - 4), calc(20px - 4) calc(20px - 4));

$.each(gridsizearray, function( k, v ){             if (gridincrement==1)             {                 gridxy = "calc(" + v +" - " + value + ") ";             }else{                 if(isodd(gridincrement)){                 gridxy = gridxy + "calc(" + v +" - " + value + ") ";                 }else{                 gridxy = gridxy + "calc(" + v +" - " + value + "), ";                 }             }               gridincrement++             })

here final code works. using .each() loop through , if even, add comma, remove last comma @ end.

                griditems = $(document.activeelement).val().split("; ");                  (i = 0; < griditems.length -1; i++) {                     gridsettings = griditems[i].split(":");                      if (gridsettings[0]=="background-size"){                         gridsizestring = gridsettings[1].replace(/,/gi, '');                         gridsizearray = gridsizestring.split(" ");                         }                      $('[data-type="sliderlayer"][data-layer="'+currentlayer+'"][data-slide="'+currentslide+'"]').css(gridsettings[0], gridsettings[1]);                  }              $.each(gridsizearray, function( k, v ){             if (gridincrement==1)             {                 gridxy = "calc(" + v +" + " + value + "px) ";             }else{                 if(isodd(gridincrement)){                 gridxy = gridxy + " calc(" + v +" + " + value + "px) ";                 }else{                 gridxy = gridxy + "calc(" + v +" + " + value + "px),";                 }             }             gridincrement++             })             if (isodd(gridincrement))                 {                     gridxy = gridxy.substring(0, gridxy.length - 1);                 }

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