javascript - How to add and remove attribute in HTML using jquery onchange event? -


hello guys want ask how can create jquery can detect user input , assign attribute or remove attribute based on user input. scenario have table 4 columns. first dropdown. , rest textboxes readonly. default option dropdown null or empty. if user choose dropdown, 2 texboxes should not readonly. on process don't have error if user set again null. 2 textboxes won't go readonly again. don't know where's error.

here's jquery code:

$("[id^=code]").on('change',function(){     var index = this.id.match(/\d+/)[0];     var validate = $('#code'+index).val();      if(validate != ''){         $("#qty"+index).removeattr('readonly');         $("#price"+index).removeattr('readonly');     }         });  $("[id^=code]").on('change',function(){     var index = this.id.match(/\d+/)[0];     var validate = $('#code'+index).val();      if(validate == ''){         $("#qty"+index).attr('readonly');         $("#price"+index).attr('readonly');     }         });

and table

for($i = 1; $i < 16; $i++){     echo "<!-- item {$i} -->";     echo "<tr>";     echo "<td>";     echo "<select name='code[]' id='code{$i}' style='width:100'>";     echo "<option value=''><label>--choose items--</label></option>";     foreach($resultgetcode->result_array() $list){         echo "<option value='".$list['itemid']."'>".$list['itemcode']." --- ".$list['itemname']."</option>";       }     echo "</select>";     echo "</td>";     //echo "<td><input type='text' name='item[]' class='k-textbox' id='item{$i}' value='' /></td>";     echo "<td><input type='text' name='qty[]' id='qty{$i}' style='text-align: center' readonly='readonly' /></td>";     echo "<td><input type='text' name='price[]' id='price{$i}' style='text-align: right;' onblur='' readonly='readonly' /></td>";     echo "<td><input type='text' name='total[]' id='total{$i}' style='font-family: courier; text-align: right; background-color: lightgray; color: red' readonly='readonly' value='' /></td>";     echo "<tr>"; }

here's fiddle: http://jsfiddle.net/rochellecanale/jnkc3/5/

would easier if create fiddle, try this

if(validate == ''){      $("#qty"+index).prop('readonly', true);      $("#price"+index).prop('readonly', true);  }

update. fiddle


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