javascript - Changing SELECT ID With Loop -


i have form can add new entries on click using javascript. however, change id of each subsequent "add-on": e.g. first tbody has id of "participant1", next 1 have id of "participant2", eighth "participant8", , forth.

here excerpt main file: 

<fieldset class="row2">     <legend>list of participants</legend>     <p>         <input type="button" value="add participant" onclick="addrow('datatable')" />         <input type="button" value="clear participants" onclick="deleterow('datatable')" />         <p>(all acions apply entries check marked check boxes only.)</p>     </p>     <table id="datatable" class="form" border="1">         <tbody>             <tr>                 <p>                     <td>                         <input type="checkbox" required="required" name="chk[]" checked="checked" />                     </td>                     <td>                         <div>participant: </div>                         <select name="participant1" id="participant1">                             <option>person a</option>                             <option>person b</option>                             <option>person c</option>                         </select>                     </td>                 </p>             </tr>         </tbody>     </table>     <div class="clear"></div> </fieldset>

and here attempting js file: 

function addrow(tableid) {     var table = document.getelementbyid(tableid);     var rowcount = table.rows.length;     if (rowcount < 50) {         var row = table.insertrow(rowcount);         var colcount = table.rows[0].cells.length;         (var = 0; < colcount; i++) {             var newcell = row.insertcell(i);             //newcell.id="participant"+ rowcount;             var cellbody = table.rows[0].cells[i].innerhtml;             newcell.innerhtml = replaceall(cellbody, 'participant1', 'participant' + (rowcount + 1));             console.log(rowcount, newcell.innerhtml)         }     }     else {         alert("more 50 participants? sure?");     } }  function replaceall(str, find, replace) {     var = str.indexof(find);     if (i > -1) {         str = str.replace(find, replace);         = + replace.length;         var st2 = str.substring(i);         if (st2.indexof(find) > -1) {             str = str.substring(0, i) + replaceall(st2, find, replace);         }     }     return str; }

but appears taking in 1 participant?

you getting javascript errors. may need wrap functions in kind of dom-ready event.

the fiddle here works, using jquery , document ready check.

http://jsfiddle.net/brettwgreen/17om5xpm/

i'd recommend using (a) jquery , (b) knockout.js.

once start using knockout or similar js framework kind of thing, you'll never go back.

js:

$(document).ready(function() {     window.addrow = function addrow(tableid) {         var table = document.getelementbyid(tableid);         var rowcount = table.rows.length;         if(rowcount < 50){                                       var row = table.insertrow(rowcount);             var colcount = table.rows[0].cells.length;             console.log(colcount);             for(var i=0; i<colcount; i++) {                 var newcell = row.insertcell(i);                 //newcell.id="participant"+ rowcount;                 var cellbody = table.rows[0].cells[i].innerhtml;                  newcell.innerhtml = replaceall( cellbody, 'participant1' , 'participant' + (rowcount+1) );                 console.log(rowcount, newcell.innerhtml)             }         }         else {            alert("more 50 participants? sure?");         }     }       window.replaceall = function replaceall(str, find, replace) {         var = str.indexof(find);         if (i > -1) {             str = str.replace(find, replace);              = + replace.length;             var st2 = str.substring(i);             if(st2.indexof(find) > -1) {               str = str.substring(0,i) + replaceall(st2, find, replace);             }                }         return str;     } });

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