html - Check whether a class exists in any row of a table in JavaScript -

i have table (simplified question):

<table><br>   <tr onclick="selectrow"><br>     <td>table data</td><br>     <td>table data</td><br>     <td>table data</td><br>   </tr><br>   <tr class="selected" onclick="selectrow"><br>     <td>table data</td><br>     <td>table data</td><br>     <td>table data</td><br>   </tr><br> </table> 

class="selected" result of clicking on row. want make button when clicked, return true if there row class 'selected', , false if there not.

any appreciated. thanks.

function checkexist(){        var mytr = document.getelementsbytagname('tr');         for(var i=mytr.length; i--;){            if(mytr[i].classname.match('(^|\\s+)selected(\\s+|$)')){                alert('true');//return true;                return;            }        }        alert('false'); //return false } 

and attach button or link this:

<table>     <tr onclick="selectrow">         <td>table data</td>         <td>table data</td>         <td>table data</td>     </tr>     <tr class='selected' onclick="selectrow">         <td>table data</td>         <td>table data</td>         <td>table data</td>     </tr> </table> <a href='#' onclick='checkexist()'>click me find out</a>