javascript - Mark highest and lowest value in HTML table -


i have html table , want mark cells adding class highest , lowest value of each column. have found few related questions here, code misbehaves.

var $table = $("#mytable"); $table.find("th").each(function(columnindex) {     var oldvalue=0, currentvalue=0, $elementtomark;     var $trs = $table.find("tr");     $trs.each(function(index, element)     {         oldvalue= currentvalue;         var $td = $(this).find("td:eq("+ columnindex +")");         if ($td.length!=0)          {             currentvalue= parsefloat($td.html());             if(currentvalue > oldvalue)             {                 $elementtomark= $td;             }             if(index == $trs.length-1)             {               $elementtomark.addclass("highest");              }         }         }); });   var $table = $("#mytable"); $table.find("th").each(function(columnindex) {     var oldvalue=1000000, currentvalue=1000000, $elementtomark;     var $trs = $table.find("tr");     $trs.each(function(index, element)     {         oldvalue= currentvalue;         var $td = $(this).find("td:eq("+ columnindex +")");         if ($td.length!=0)          {             currentvalue= parsefloat($td.html());             if(currentvalue < oldvalue)             {                 $elementtomark= $td;             }             if(index == $trs.length-1)             {               $elementtomark.addclass("lowest");              }         }         }); });

here jsfiddle: link

the problem doesn't mark right values , cannot see reason.

you updating oldvalue @ wrong place.

 var $table = $("#mytable");     $table.find("th").each(function(columnindex)     {         var oldvalue=0, currentvalue=0, $elementtomark;         var $trs = $table.find("tr");         $trs.each(function(index, element)         {              var $td = $(this).find("td:eq("+ columnindex +")");             if ($td.length!=0)              {                 currentvalue= parsefloat($td.html());                 if(currentvalue > oldvalue)                 {                     $elementtomark= $td;                     oldvalue= currentvalue;                 }                 if(index == $trs.length-1)                 {                   $elementtomark.addclass("highest");                  }             }             });     });       var $table = $("#mytable");     $table.find("th").each(function(columnindex)     {         var oldvalue=1000000, currentvalue=1000000, $elementtomark;         var $trs = $table.find("tr");         $trs.each(function(index, element)         {              var $td = $(this).find("td:eq("+ columnindex +")");             if ($td.length!=0)              {                 currentvalue= parsefloat($td.html());                 if(currentvalue < oldvalue)                 {                     $elementtomark= $td;                     oldvalue= currentvalue;                  }                 if(index == $trs.length-1)                 {                   $elementtomark.addclass("lowest");                  }             }             });     })

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