将事件对象从指令传递到回调

Question

我正在使用 Angular 1.5.6。

我有一个检查双击的指令：

angular.module('redMatter.analyse')
.directive('iosDblclick',
  function () {

      var DblClickInterval = 300; //milliseconds

      var firstClickTime;
      var waitingSecondClick = false;

      return {
          restrict: 'A',

          link: function (scope, element, attrs) {
              element.bind('click', function (e) {

                  if (!waitingSecondClick) {
                      firstClickTime = (new Date()).getTime();
                      waitingSecondClick = true;

                      setTimeout(function () {
                          waitingSecondClick = false;
                      }, DblClickInterval);
                  }
                  else {
                      waitingSecondClick = false;

                      var time = (new Date()).getTime();
                      if (time - firstClickTime < DblClickInterval) {

                          scope.$apply(attrs.iosDblclick);

                      }
                  }
              });
          }
      };
  });

我在这里使用这个：

<div ios-dblclick="onDoubleClick($event, graph)" ></div>

graph 是 ng-repeat 指令中的一个对象。在 onDoubleClick 中，我需要访问 $event:

$scope.onDoubleClick = function($event, graph){

    console.log('in onDoubleClick and arguments are ', arguments);

    var element = $event.srcElement;

但是我不确定如何将事件从指令传递到 onDoubleClick。在控制台日志中，参数打印为：

[undefined, Object]

其中 Object 是 graph。我怎样才能同时传回事件？

Answer 1

已更新

http://jsfiddle.net/ADukg/14470/ - 工作示例。

因此，您可以像这样将函数传递给指令：

<div ios-dblclick="onDoubleClick" ios-dblclick-arg="graf" ></div>

在你的指令中：

      return {
      restrict: 'A',
      scope: {
        myCallback: '=iosDblclick',
        graph: '=iosDblclickArg'
      },
      link: function (scope, element, attrs) {
          element.bind('click', function (e) {

              if (!waitingSecondClick) {
                  firstClickTime = (new Date()).getTime();
                  waitingSecondClick = true;

                  setTimeout(function () {
                      waitingSecondClick = false;
                  }, DblClickInterval);
              }
              else {
                  waitingSecondClick = false;

                  var time = (new Date()).getTime();
                  if (time - firstClickTime < DblClickInterval) {
                      scope.myCallback(e, scope.graph)

                  }
              }
          });
      }
  }

Answer 2

您可以将回调传递给指令，如下所示：onDoubleClick: '&' - 隔离范围

webApp.directive('iosDblclick',
  function () {

      var DblClickInterval = 300; //milliseconds

      var firstClickTime;
      var waitingSecondClick = false;

      return {
          restrict: 'A',
          scope: {
            onDoubleClick: '&'
        },

          link: function (scope, element, attrs) {
              element.bind('click', function (e) {

                  if (!waitingSecondClick) {
                      firstClickTime = (new Date()).getTime();
                      waitingSecondClick = true;

                      setTimeout(function () {
                          waitingSecondClick = false;
                      }, DblClickInterval);
                  }
                  else {
                      waitingSecondClick = false;

                      var time = (new Date()).getTime();
                      if (time - firstClickTime < DblClickInterval) {
                          scope.onDoubleClick({data: {e:e, val: "someValue"}});
                      }
                  }
              });
          }
      };
  });

其中 HTML 是：

<div ios-dblclick  on-double-click="onDoubleClick(data)" ></div>

和控制器：

$scope.onDoubleClick = function(data){
    var element = data.e.srcElement;
}

Plunker Demo

Answer 3

由于您可以使用 $eval 方法传递 locals，请考虑在调用 attrs.iosDblclick 时使用它。在内部它使用 $parse API 来评估方法并使用本地作为参数。

scope.$eval(attrs.iosDblclick, {$event: e});

Plunker Demo

另见

将事件对象从指令传递到回调

Pass event object from directive to callback

javascript

angularjs

angularjs-directive