javascript - Is it possible to change font color based on background slider image name using jQuery? -

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i trying change font color of navigation based on color of background image image slider. i'm adding class nav looking @ end of image name "dark.png" or "light.png" change font color don't know how change font color every time slider switches images.

if there simpler/better solution out there please let me know. realize i'm mixing pure javascript , jquery in example if has pure jquery solution awesome.

here code simplified version troubleshooting. did jsfiddle example.

html:

<body>     <nav>         <ul>             <li>about</li>         </ul>     </nav> </body>

css:

body {      background-repeat: no-repeat;     background-size:cover;     width:300px;     height:300px; }  .dark {     color:#ffffff; }

javascript:

$(document).ready(function(){                  //slideshow:             $(function () {                 var slideshow = $('body');                 var backgrounds = [                     'url(http://markpfaff.com/bk1-dark.png)',                    'url(http://markpfaff.com/bk2-light.png)'];                 var current = 0;                  function nextbackground() {                      slideshow.css(                         'background-image',                     backgrounds[current = ++current % backgrounds.length]);                      settimeout(nextbackground, 5000);                 }                  settimeout(nextbackground, 5000);                 slideshow.css('background-image', backgrounds[0]);             });  });  (function colorchange(){     var b = $('body').css('background-image');     if(b.match(/-dark.png\)$/)){         $("nav").addclass("dark");     }else if(b.match(/-light.png\)$/)){         $("nav").removeclass("dark");     } })();

there many options , here 1 of them. keep array of classes relative index of backgrounds. there no need of color change function.

$(function () {     var slideshow = $('.body');     var backgrounds = [         'url(http://markpfaff.com/bk1-dark.png)',          'url(http://markpfaff.com/bk2-light.png)'];     var colorsclasses = ['dark','light'];     var current = 0;      function nextbackground() {         slideshow.css(             'background-image',             backgrounds[current = ++current % backgrounds.length]         );         $("nav").attr("class",colorsclasses[current]);         settimeout(nextbackground, 5000);     }      settimeout(nextbackground, 5000);     slideshow.css('background-image', backgrounds[0]);     slideshow.css("color",color[0]); });

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