javascript - prev / next nav codes to be more efficient and flexible -


i have working codes sets prev , next url based on available pages numbers , url on.

my codes way long , not flexible @ all. how can make more flexible , production ready?

http://jsfiddle.net/sunflowersh/ppdl7/5/ 

var currentindex = '4'; //updated based on current index data   var indexnum = parseint(currentindex); var currenturl  =      document.location.href.substring(document.location.href.lastindexof("/")+1, document.location.href.length);  var baseurl ="/en_us/";  var lefturl = ""; var righturl = "";  switch(indexnum) { case 2:  // if there index, index1, , index2  if((currenturl.indexof("index.html")>-1)||(currenturl.indexof("index.")>-1)){  lefturl= baseurl + "index" + parseint(indexnum+1) + ".html";  righturl= baseurl + "index" + parseint(indexnum+1) + ".html";  } else {  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum+1) + ".html";  } break; case 3:  // if on index3.html or index.html // make right arrow url go index1.html  if((currenturl.indexof("index3.html")>-1)||(currenturl.indexof("index.")>-1)){  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum-2) + ".html";  } else {  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum+1) + ".html";  }  break; case 4: if((currenturl.indexof("index4.html")>-1)||(currenturl.indexof("index.")>-1)){  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum-3) + ".html";  } else {  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum+1) + ".html";   }  break;  case 5:  if((currenturl.indexof("index5.html")>-1)||(currenturl.indexof("index.")>-1)){  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum-3) + ".html";  } else {  lefturl= baseurl + "index" + parseint(indexnum-1) + ".html";  righturl= baseurl + "index" + parseint(indexnum+1) + ".html";  }  break;  default:  // if no current index, disable link  lefturl= baseurl + "#";  righturl= baseurl + "#";   }   var leftarrow =$(".leftarrow").find("a").attr("href",lefturl);  var rightarrow =$(".rightarrow").find("a").attr("href",righturl);

have see @ http://jsfiddle.net/steelywing/ppdl7/6/

create index.js

var baseurl = "/en_us/index"; var maxindex = 4; function updatenav(index) {     if (index-1 > 0) {         $('.leftarrow a').attr('href', baseurl + (index-1) + '.html');     } else {         $('.leftarrow a').hide();     }      if (index+1 <= maxindex) {         $('.rightarrow a').attr('href', baseurl + (index+1) + '.html');     } else {         $('.rightarrow a').hide();     } }

and, in every index.html, call updatenav() onload

<script>updatenav(2); // 2 current index </script>

if need parse url, try using regexp /\/index(\d+)\.html$/ (http://jsfiddle.net/steelywing/uex5m/)


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