javascript - Enable/disable button if value is different than select by default -


i need toggle button state between enabled/disabled if change default value of select element. take html example:

<select      ng-change="statusbtn(btnupdfee, updfee)"      ng-options="wt.id wt.name wt in wtax"      ng-model="updfee"      class="ng-pristine ng-valid" >     <option value="0" selected="selected">cm-534be5d66aea3</option>     <option value="1" selected="selected">cm-534be5d681a02</option>     <option value="2">cm-534be5d68316e</option> </select>  <button disabled="" ng-click="showcommentmodal('updatefee')" class="btn btn-success" id="btnupdfee"><i class="icon-ok"></i></button>

and code wrote it's not working:

$scope.statusbtn = function(btnid, curvalue) {     if (curvalue != $scope.updfee) {         $("#" + btnid).removeattr("disabled");     } else {         $("#" + btnid).attr("disabled");     } }

what miss?

edit

i made changes , code this:

<button class="btn btn-success" ng-click="showcommentmodal('updatefee')" ng-disabled="!btnstatus"><i class="icon-ok"></i></button>  $scope.$watch("updfee", function(newvalue, oldvalue) {     if (newvalue === oldvalue) {         $scope.btnstatus = false;     } else {         $scope.btnstatus = true;     }      console.log($scope.btnstatus, newvalue, oldvalue); });

and output:

first page load (no changes): false undefined undefined first page load (no changes): true 2 undefined changing select: true 1 2 changing select again: true 3 1

but still not working, i'm doing wrong?

don't use jquery set properties in angular driven application! use ng-disabled set flag. on change of select - check need , set flag:

<button ng-disabled="isnotdefault" ng-click="showcommentmodal('updatefee')" class="btn btn-success" id="btnupdfee"><i class="icon-ok"></i></button>  $scope.statusbtn = function(btnid, curvalue) {     $scope.isnotdefault = curvalue != $scope.updfee }

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