javascript - AngularJS textbox value undefined -


i have created directive wherein copies value of textbox1 textbox2. 

function mycopytext() {     return {         restrict: 'a',         link: function(scope, element, attr) {             $('#textbox2').val($('#textbox1').val())         }     } }

then on textbox field:

<input type="text" id="textbox1" ng-model="vm.textbox1" my-copy-text /> <input type="text" id="textbox2" ng-model="vm.textbox2" />

it works fine until submitted form wherein vm.textbox2 undefined. if manually inputted value on textbox2, vm.textbox2 able display value.

i find weird when directive value assignment, vm.textbox2's value undefined not until manually set value typing in.

that's design. angular digest kicks in when change value via input/change event therefore val() not trigger setviewvalue, model value not updated.

this directive replicate value model/view name pass in replicate-to attribute:

function replicateto($parse) {    return {         scope: false,         require: 'ngmodel',         restrict: 'a',         link: function(scope, element, attr, ngmodelctrl) {              var target = $parse(attr.replicateto);               var angularrender = ngmodelctrl.$render;               ngmodelctrl.$render = function(){                 angularrender();                 target.assign(scope, ngmodelctrl.$viewvalue);              };               ngmodelctrl.$viewchangelisteners.push(function(){                 target.assign(scope, ngmodelctrl.$viewvalue);              });         }     } }  <input type='text' ng-model="vm.textbox1" data-replicate-to="vm.textbox2"/> <br>

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