如何根据条件创建在目标元素上添加ng-class和ng-disabled的指令？

我会选择你的编辑#2,因为它们是相关的.如果我们将它们创建为单独的元素,我们需要以某种方式将相关元素传递给每个元素=>当我们单击1按钮时,我们更新自身以及相关元素.

在这里,我修改了您的第一种方法,使其工作:http://plnkr.co/edit/KgYIlATiw9xzTEZt9Jv1？p = preview

在这个例子中,我必须将相关元素传递给每个指令,这样当我们点击时我们可以更新自己和相关元素:

related-element="btnForward"

我在指令中做了一些修改:

scope: {
      reactOn: "=", //use property binding instead of function binding
      relatedElement:"@" 
    },
link: function(scope, element, attrs) { 
      scope.toggle = function(){
        scope.reactOn = !scope.reactOn;//toggle current element
        var relatedScope = $("#"+scope.relatedElement).scope();//get related element's scope and toggle it
        relatedScope.reactOn = !relatedScope.reactOn;
      }
      //var cattr = attrs.ngDisableReactOn;
      element.attr("ng-class", "{'disabled': !reactOn}"); //Use reactOn instead as this is the property of current scope
      element.attr("ng-disabled", "!reactOn");
      element.attr("ng-click", "toggle()"); 
      element.removeAttr("ng-disable-react-on");
      $compile(element)(scope);
    }

我们不需要让事情复杂化.只需创建一个普通指令来包装2个按钮.

myApp.directive("ngDisableReactOn", function($compile) {
  return {
    restrict: "A",
    templateUrl:"ngDisableReactOn.html",
    scope: {
      can_go_back: "@"
    },
    link: function(scope, element, attrs) { 
      scope.goBack = function(){
          scope.can_go_back = false;
      }

      scope.goFwd = function(){
          scope.can_go_back = true;
      }
    }
  }
});

模板:

<input type="button" value="go back" ng-click="goBack()"  ng-class="{'disabled': !can_go_back}" ng-disabled="!can_go_back">
<input type="button" value="go fwd"  ng-click="goFwd()"   ng-class="{'disabled': can_go_back}" ng-disabled="can_go_back">

DEMO

另一种解决方案是将父指令创建为容器.这是我最喜欢的解决方案.使用这种方法,您可以自由更改指令的内部内容,例如添加更多按钮,更多文本,....(不需要硬编码模板)父指令作为管理员工作,以确保只有1个活动一次一个孩子:

myApp.directive("ngDisableReactOnContainer", function() { //Container directive to manage all child directives
  return {
    restrict: 'EA',
    replace: true,
    transclude: true,//Use transclusion to move inner content to the template
    template: '<div ng-transclude></div>',
    controller: function() {
      var children = []; 
      this.selectChild = function(activeChild) { //ensure that only 1 child is active at a time
        activeChild.active = true;
        angular.forEach(children, function(child) {
          if (child != activeChild) {
            child.active = false;
          }
        });
      }

      this.addChild = function(child) {
        children.push(child);
      }
    }
  };
});

myApp.directive("ngDisableReactOn", function($compile) {
  return {
    restrict: "A",

    scope:{
      active:"@"
    },

    require: '^?ngDisableReactOnContainer',
    link: function(scope, element, attrs, controller) {

      scope.active = scope.active === 'true';

      controller.addChild(scope);//register itself with the container

      scope.select = function(){//When this element is clicked, inform the container to toggle all children accordingly.
         controller.selectChild(scope);
      }

      //Add ng-class and ng-disabled based on your requirement.
      element.attr("ng-class", "{'disabled': active}"); //Use active instead as this is the property of current scope
      element.attr("ng-disabled", "active");
      element.attr("ng-click", "select()"); 
      element.removeAttr("ng-disable-react-on");
      $compile(element)(scope);
    }
  }
});

使用这些指令很简单:

<div ng-disable-react-on-container>
    <input ng-disable-react-on type="button" value="button 1" active="true" >
    <input ng-disable-react-on type="button" value="button 2" >
    <input ng-disable-react-on type="button" value="button 3" >
</div>

DEMO