Search table contents using javascript -

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i working on javascript. in code have table , textbox. when enter data in textbox should show particular value typed doesn't search data table. how search data in table?

here's jsfiddle http://jsfiddle.net/surwn/

html:

<table name="tablecheck" class="data" id="results" >     <thead>         <tr>             <th>&nbsp;</th>             <th>&nbsp;</th>             <th><center> <b>course code</b></center></th>             <th><center>course name</center></th>         </tr>     </thead>     <tbody>         <tr id="rowupdate" class="tableheaderfooter">              <td >                 <center> <input    type="text"    name="input"    value="course" ></center>                 <center> <input    type="text"    name="input"    value="course1" ></center>                 <center> <input    type="text"    name="input"    value="course2" ></center>             </td>             <td>                 <center> <input    type="text"    name="input"    value="subject" ></center>                 <center> <input    type="text"    name="input"    value="subject1" ></center>                 <center> <input    type="text"    name="input"    value="subject2" ></center>             </td>         </tr>     </tbody> </table > <form action="#" method="get" onsubmit="return false;">     <label for="q">search here:</label><input type="text" size="30" name="q" id="q" value="" onkeyup="dosearch();" />  </form>

javascript:

<script type="text/javascript"> //<!-- function dosearch() {     var q = document.getelementbyid("q");     var v = q.value.tolowercase();     var rows = document.getelementsbytagname("tr");     var on = 0;     ( var = 0; < rows.length; i++ ) {         var fullname = rows[i].getelementsbytagname("td");         fullname = fullname[0].innerhtml.tolowercase();         if ( fullname ) {             if ( v.length == 0 || (v.length < 3 && fullname.indexof(v) == 0) || (v.length >= 3 && fullname.indexof(v) > -1 ) ) {                 rows[i].style.display = "";                 on++;             } else {                 rows[i].style.display = "none";             }         }     } } //--> </script>

checking chrome console, seems innerhtml 'fullname' returning error:

var fullname = rows[i].getelementsbytagname("td"); fullname = fullname[0].innerhtml.tolowercase();

that's because first tr tag have in thead , doesn't have td @ all. changing start of loop 1 fix that:

for ( var = 1; < rows.length; i++ ) {    //... , on

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