AngularJS $watch 窗口在指令内调整大小

Question

我的模块模式如下所示：

'use strict';

angular.module('app', [])
   .directive('myDirective', ['SomeDep', function (SomeDep) {
       var linker = function (scope, element, attr) {
          // some work
       };

       return {
          link: linker,
          restrict: 'E'
       };
   }])
;

我遇到的麻烦是将 $watch 集成到其中。使用 '$window' 服务特别关注窗口大小调整。

[编辑]：

我一直意识到我的问题是什么...当我忘记将它作为属性实现时，我一直在限制元素... @_@;

Answer 1

您可以收听resize 事件并在某些维度发生变化时触发

指令

(function() {
'use strict';

    angular
    .module('myApp.directives')
    .directive('resize', ['$window', function ($window) {
        return {
            link: link,
            restrict: 'A'
        };

        function link(scope, element, attrs){
            scope.width = $window.innerWidth;
            function onResize(){
                // uncomment for only fire when $window.innerWidth change   
                // if (scope.width !== $window.innerWidth)
                {
                    scope.width = $window.innerWidth;
                    scope.$digest();
                }
            };

            function cleanUp() {
                angular.element($window).off('resize', onResize);
            }

            angular.element($window).on('resize', onResize);
            scope.$on('$destroy', cleanUp);
        }
    }]);
})();

在html中

<div class="row" resize> ,
    <div class="col-sm-2 col-xs-6" ng-repeat="v in tag.vod"> 
        <h4 ng-bind="::v.known_as"></h4>
    </div> 
</div> 

控制器：

$scope.$watch('width', function(old, newv){
     console.log(old, newv);
 })

Answer 2

// 以下是 angular 2.0 指令，用于调整窗口大小的滚动条，根据您的标签调整给定元素

---- angular 2.0 window resize directive.
import { Directive, ElementRef} from 'angular2/core';

@Directive({
       selector: '[resize]',
       host: { '(window:resize)': 'onResize()' } // Window resize listener
})

export class AutoResize {

element: ElementRef; // Element that associated to attribute.
$window: any;
       constructor(_element: ElementRef) {

         this.element = _element;
         // Get instance of DOM window.
         this.$window = angular.element(window);

         this.onResize();

    }

    // Adjust height of element.
    onResize() {
         $(this.element.nativeElement).css('height', (this.$window.height() - 163) + 'px');
   }
}

Answer 3

你不应该需要 $watch。只需绑定到窗口上的调整大小事件：

DEMO

'use strict';

var app = angular.module('plunker', []);

app.directive('myDirective', ['$window', function ($window) {

     return {
        link: link,
        restrict: 'E',
        template: '<div>window size: {{width}}px</div>'
     };

     function link(scope, element, attrs){

       scope.width = $window.innerWidth;

       angular.element($window).bind('resize', function(){

         scope.width = $window.innerWidth;

         // manuall $digest required as resize event
         // is outside of angular
         scope.$digest();
       });

     }

 }]);