ng-init选择输入元素的文本

每当用户检查/取消选中一个复选框时，我正在设置var edit = true / false。我有一个输入字段，该字段出现/消失在编辑的true/fals上。我想做的就是在出现文本字段时选择输入字段的文本值。

html：

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <input type="checkbox" ng-model="edit" ng-init="edit = true">
    <div ng-bind="edit"></div>
    <div ng-if="edit">
      <input type="text" select-text ng-model="name" size="30" placeholder="New Name" />
    </div>
  </div>
</div>

JS：

var myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
  $scope.name = "Johny";
}]);
myApp.directive('selectText', function() {
    return {
    require: 'ngModel',
    link: function(scope, elem, attrs, ctrl) {
        elem.bind('focus', function() {
            $(elem).select();
        });
      $(elem).focus();          
    }
  };
});

每当出现textfield的焦点事件时，我都会很难。

http://jsfiddle.net/pnnzb5sm/2/

我使用 $watch做到了，以便每当edit更新时，都会称其为

尝试这个

<html>
<head>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js">
</script>
	<script>
	var myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
  $scope.name = "Johny";
}]);
myApp.directive('selectText', function() {
    return {
    require: 'ngModel',
    link: function(scope, elem, attrs, ctrl) {
        elem.bind('focus', function() {
            $(elem).select();
        });
        scope.$watch("edit",function(newValue,oldValue) {
        //This gets called when data changes.
            $(elem).select();
        });
      $(elem).focus();  
    }
  };
});
	</script>
</head>
<body>
<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <input type="checkbox" ng-model="edit" ng-init="edit = true">
    <div ng-bind="edit"></div>
    <div ng-if="edit">
      <input type="text" select-text ng-model="name" size="30" placeholder="New Name" />
    </div>
  </div>
</div>
</body>
</html>

使用此

 if (!$window.getSelection().toString()) {
     this.setSelectionRange(0, this.value.length)
 }

演示

var myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
  $scope.name = "Johny";
}]);
myApp.directive('selectText', function($window) {
    return {
    require: 'ngModel', 
    link: function(scope, elem, attrs, ctrl) {
          elem.on('focus', function () {
                if (!$window.getSelection().toString()) {
                    // Required for mobile Safari
                    this.setSelectionRange(0, this.value.length)
                }
            });   
    }
  };
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <input type="checkbox" ng-model="edit" ng-init="edit = true">
    <div ng-bind="edit"></div>
    <div ng-if="edit">
      <input autofocus type="text" select-text ng-model="name" size="30" placeholder="New Name" />
    </div>
  </div>
</div>

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