javascript - Add a number only when a radio button is selected -

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i want add number total amount based on radio button select if user selects radio button value = "serfeeadd" need check it, , add total can't figure out why not working when remove scope = this , use $scope directly kinda works, need value assigned variable.

i trying build magento wristband designer app built stuck part .

the code has been modified provide guys overview more can let me know.

var app = angular.module('wdwristbanddesigner', []);    app.controller("fontctrl", maincontroller);    function maincontroller($scope){      //scope    var scope = this;        scope.foo = function(){      if (scope.serialisationfeecheck == 'serfeeadd') {      scope.serialisationfee = 10;      console.log(scope.serialisationfeecheck);    }    else {      scope.serialisationfee = 0;    };    }    };
<section class="wd-section" ng-controller="fontctrl fs">    <input type="radio" name="serialno" data-ng-model="serialisationfeecheck" value="no"  >no              <br>              <input type="radio" name="serialno" data-ng-model="serialisationfeecheck" value="our">yes(our choice)              <br>              <input type="radio"  id="chk" name="serialno" data-ng-model="serialisationfeecheck" value="serfeeadd" >yes(your choice)  <button typ="button" ng-click="foo()" >click</button>    </section>

ng-click should fs.foo() , of ng-models need fs object applied them.


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