ng-model是未定义的，如果使用ng-if则可以使用ng-show

问题描述

我有非常基本的功能，例如在单击功能上获取文本值.我在ng-if中有一个文本框.但是，当我尝试获取该值时，它说" uneifned "，我对此大加赞赏，并知道ng-if创建了自己的作用域.因此，如果为true，则说明控制器中定义的单击功能为何起作用.两者都在控制器中定义. plnkr

I have very basic functionality which is like get text value on click function. I have a text box inside ng-if. But when I am trying to get the value it says 'undeifned' I red about it and came to know that ng-if create its own scope. So if it is true then why click function is working which is defined in controller.Both are defined in controller.plnkr

app.controller('MainCtrl', function($scope) {
  $scope.comment="";
  $scope.showBox = function (){
    $scope.showTextBox = true;
  }
  $scope.getComment = function (){
    alert($scope.comment);
    $scope.showTextBox = false;
  }

});

推荐答案

ng-if创建新的子范围.ng-show没有.我猜$ scope.comment是在ng-if内部定义的.

ng-if creates a new child scope. ng-show does not.I'm guessing the $scope.comment is defined inside the ng-if.

如果您不想使用ng-show，则有时可以使用对象而不是简单变量来工作.例如:

If you don't want to use ng-show, sometime using an object instead of a simple variable will work. Ex:

$scope.comment= { c: "" };
alert($scope.comment.c);
<textarea ng-model="comment.c">

更新的plunkr: http://plnkr.co/edit/DewF13GWVIS8bHQIIAbC?p=preview

Updated plunkr: http://plnkr.co/edit/DewF13GWVIS8bHQIIAbC?p=preview

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