Scope issue in AngularJS using AngularUI Bootstrap Modal

问题

plunker: http://plnkr.co/edit/wURNg8ByPYbEuQSL4xwg

example.js:

angular.module('plunker', ['ui.bootstrap']);
  var ModalDemoCtrl = function ($scope, $modal) {

  $scope.open = function () {
    var modalInstance = $modal.open({
      templateUrl: 'modal.html',
      controller: 'ModalInstanceCtrl'
    });
  };
};

var ModalInstanceCtrl = function ($scope, $modalInstance) {

  $scope.ok = function () {
    alert($scope.text);
  };

  $scope.cancel = function () {
    $modalInstance.dismiss('cancel');
  };
};

index.html:

<!doctype html>
<html ng-app="plunker">
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.js"></script>
    <script src="http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.6.0.js"></script>
    <script src="example.js"></script>
    <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css" rel="stylesheet">
  </head>
  <body>

  <div ng-controller="ModalDemoCtrl">
    <button class="btn" ng-click="open()">Open me!</button>
    <div ng-show="selected">Selection from a modal: {{ selected }}</div>
  </div>
 </body>
</html>

modal.html:

<div class="modal-header">
    <h3>I'm a modal!</h3>
</div>
<textarea ng-model="text"></textarea>
<div class="modal-footer">
    <button class="btn btn-primary" ng-click="ok()">OK</button>
    <button class="btn btn-warning" ng-click="cancel()">Cancel</button>
</div>

Why I can't get the $scope.text defined in ModalInstanceCtrl, even though I can use $scope.ok and $scope.cancel?

回答1:

Looks like a scope issue. I got it to work like this:

var ModalInstanceCtrl = function ($scope, $modalInstance) {
    $scope.input = {};
    $scope.ok = function () {
        alert($scope.input.abc);
    };

    $scope.cancel = function () {
        $modalInstance.dismiss('cancel');
    };
};

HTML:

<textarea ng-model="input.abc"></textarea>

回答2:

Update Nov 2014: the issue is fixed with angular-ui-bootstrap 0.12.0 - the transclusion scope is merged with the controller's scope. There is no need to do anything. Just stay with:

<textarea ng-model="text"></textarea>

Before 0.12.0:

Angular-UI modals are using transclusion to attach modal content, which means any new scope entries made within modal are created in child scope.

You should use inheritance and initialize empty text entry in parent $scope or you can explicitly attach the input to parent scope:

<textarea ng-model="$parent.text"></textarea>

回答3:

Let'me try to explain the reason. ui-bootstrap modal sourcecode:

.directive('modalWindow', ['$modalStack', '$timeout', function ($modalStack, $timeout) {
return {
  restrict: 'EA',
  scope: {
    index: '@',
    animate: '='
  },
  replace: true,
  transclude: true,
  templateUrl: function(tElement, tAttrs) {
    return tAttrs.templateUrl || 'template/modal/window.html';
  },

and the template sourcecode - window.html:

<div tabindex="-1" role="dialog" class="modal fade" ng-class="{in: animate}" ng-style="{'z-index': 1050 + index*10, display: 'block'}" ng-click="close($event)">
<div class="modal-dialog" ng-class="{'modal-sm': size == 'sm', 'modal-lg': size == 'lg'}"><div class="modal-content" modal-transclude></div></div>

there is a directive modal-transclude，your dialog content will insert into it, it's sourcecode:

.directive('modalTransclude', function () {
return {
  link: function($scope, $element, $attrs, controller, $transclude) {
    $transclude($scope.$parent, function(clone) {
      $element.empty();
      $element.append(clone);
    });
  }
};

})

now take a look at offical doc of $compile:

Transclusion Functions

When a directive requests transclusion, the compiler extracts its contents and provides 
a transclusion function to the directive's link function and controller. 
This transclusion function is a special linking function that will return the compiled 
contents linked to a **new transclusion scope.**

transclude will create a new scope of controller scope

来源：https://stackoverflow.com/questions/18716113/scope-issue-in-angularjs-using-angularui-bootstrap-modal

标签

angularjs

angular-ui

angular-ui-bootstrap