javascript - How to record a function is executed and not to run it again over the same DIV using jQuery -


in few carousel slides converting div's pixel value percentage.

$('#carousel-lesson-slide').on('slid.bs.carousel', function () {  //  convert percentage   function convert_to_percentage(el){     var parent = el.parent();     el.css({       left:parseint(el.css('left'))/parent.width()*100+"%",       top: parseint(el.css('top'))/parent.height()*100+"%",       width: el.width()/parent.width()*100+"%",       height: el.height()/parent.height()*100+"%"     });   }    if ($('.droppable-icon-on-img-wrap').is(":visible")) {     $(".dropped-icon-holder").each(function(){       convert_to_percentage($(this))     });   }    if ($('.droppable-label-on-img-wrap').is(":visible")) {     $(".dropped-label-holder").each(function(){       convert_to_percentage($(this))     });   }  });

so, question is: how can avoid converting .dropped-icon-holder , .dropped-label-holder width percentage again , again while switching between slides.

please note: .dropped-icon-holder , .dropped-label-holder come in more 1 slide once converted pixel percentage value again conversion should not happen. need keep every line of code within slid.bs.carousel because .dropped-icon-holder , .dropped-label-holder parent's width.

store flag each element, using data(), when function called it. check flag , continue function if false:

function convert_to_percentage(el){     if(el.data('converted')) return;      var parent = el.parent();     el.css({         left:parseint(el.css('left'))/parent.width()*100+"%",         top: parseint(el.css('top'))/parent.height()*100+"%",         width: el.width()/parent.width()*100+"%",         height: el.height()/parent.height()*100+"%"     }).data('converted', true); }

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