Question

所以我是Angular和JS的新手，我一直试图做一些简单而没有成功的事情。

我有一个包含数据的表，每当这些数据发生变化时，我想淡出淡出动画使其闪烁。我假设我可以使用$watch来观察元素是否发生变化但是它无法正常工作。

这是我到目前为止所得到的：

HTML：

<tbody md-body>
   <tr md-row ng-repeat="item in info.data">
      <td md-cell>{{item.name}}</td>
      <td md-cell>{{item.id}}</td>
      <td md-cell>{{item.thing2}}</td>
      <td md-cell>{{item.thing3}}</td>
      <td md-cell>{{item.thing4}}</td>
      <td md-cell>{{item.thing5}}</td>
   </tr>
 </tbody>

JS：

 $scope.info = {
  "data": [
    {
      name: "ELI 0001",
      id: "123",
      thing1: "thing",
      thing2: "thing",
      thing3: "thing",
      thing4: "thing",
      thing5:"thing",
    },
    {
      name: "ELI 0001",
      id: "123",
      thing1: "thing",
      thing2: "thing",
      thing3: "thing",
      thing4: "thing",
      thing5:"thing",
    },
  ]
};

我添加了这个功能来观察整个数据集的变化，当它发生变化时，我发出警报。我还添加了变量initialising，因此它一加载就不会显示。

var initializing = true
$scope.$watch('if',function(){
if (initializing) {
    $timeout(function() { initializing = false; });
  } else {
    alert('hey')
  }

}）

我的问题是，我怎样才能让它观察所有单元格并执行一个仅对变化的数据执行动画的类？

Answer 1

作为这个帖子https://groups.google.com/forum/#!msg/angular/xZptsb-NYc4/rKAxJ3dQhbMJ，我最终做的是：

app.directive('highlightOnChange', function() {
  return {
    link: function($scope, element, attrs) {
      attrs.$observe('highlightOnChange', function(val) {
        var el = $(element);
        el.removeClass('blink_me ');
        _.defer(function() {
          el.addClass('blink_me ')
        });
      });
    }
  };
});

也就是说，创建一个指令会观察该属性。然后你可以像这样使用它：

<td md-cell highlight-on-change="{{item.name}}"></td>
...

假设你的css类是：

.blink_me {
  animation: blinker 1s linear infinite;
}    
@keyframes blinker {
  50% {
    opacity: 0;
  }
}

Answer 2

我正在研究类似于@khateeb的方法 - 除了我在元素$watch上使用ng-model而不是在指令属性上使用$observe。两者都有效！

Plunker：https://embed.plnkr.co/rZVjPmDft997Kmny1LS4/

摘录：

＆＃13;

(function() {

  "use strict";

  var app = angular
    .module('plunker', [])
    .controller('MainCtrl', MainCtrl)
    .directive('flashTd', flashTD);

  function flashTD($timeout, $compile) {
    return {
      scope: {
        ngModel: '='
      },
      link: function($scope, elem, attrs) {

        // Set a watch on ng-model to wait for value change
        $scope.$watch('ngModel', function(newVal, oldVal) {
          if (newVal !== oldVal) {
            // Flash row
            // var row = angular.element(elem[0].parentNode.parentNode);

            // Flash td
            var td = angular.element(elem[0].parentNode);

            // Using a timeout to simulate remote data change
            $timeout(function() {

              if (td.hasClass('flash')) {
                td.removeClass('flash');
              }

              $timeout(function() {
                td.addClass('flash')
              })

            }, 2000)

          }
        })
      }
    }
  }

  MainCtrl.$inject = ["$scope"];

  function MainCtrl($scope) {

    // Sample Data
    $scope.info = {
      "data": [{
        name: "ELI 0001",
        id: "123",
        thing1: "thing",
        thing2: "thing",
        thing3: "thing",
        thing4: "thing",
        thing5: "thing",
      }, {
        name: "ELI 0001",
        id: "1234",
        thing1: "thing",
        thing2: "thing",
        thing3: "thing",
        thing4: "thing",
        thing5: "thing",
      }]
    };

  }

})()

＆＃13;

.editPencil:hover {
  cursor: pointer;
}


/* https://stackoverflow.com/questions/14607695/flashing-table-row */

@keyframes flash {
  from {
    background-color: #ffbe76;
  }
  to {
    background-color: inherit;
  }
}

.flash {
  animation: flash 1s 1;
}

＆＃13;

<!DOCTYPE html>
<html ng-app="plunker">

<head>
  <meta charset="utf-8" />
  <title>AngularJS - Flash TD on Change</title>
  <link data-require="bootstrap@3.3.7" data-semver="3.3.7" rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
  <link rel="stylesheet" href="style.css" />

  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script data-require="bootstrap@3.3.7" data-semver="3.3.7" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <script>
    document.write('<base href="' + document.location + '" />');
  </script>

  <script data-require="angular.js@1.3.x" src="https://code.angularjs.org/1.3.20/angular.js" data-semver="1.3.20"></script>
  <script src="app.js"></script>
</head>

<body ng-controller="MainCtrl">
  <div class="container">
    <div class="row">
      <div class="col-xs-12">
        <div class="jumbotron text-center">
          <h3>AngularJS - Flash TD on Change</h3>
        </div>
      </div>
      <div class="col-xs-12 col-sm-12 col-md-12">
        <form class="form">
          <div class="form-group">
            <table class="table">
              <thead>
                <tr>
                  <th></th>
                  <th>Name</th>
                  <th>Id</th>
                  <th>Thing1</th>
                  <th>Thing2</th>
                  <th>Thing3</th>
                  <th>Thing4</th>
                  <th>Thing5</th>
                </tr>
              </thead>
              <tbody>
                <tr ng-repeat="item in info.data">
                  <td class="editPencil glyphicon-pencil text-center" style="transform: rotate(45deg)" ng-click="editRow = !editRow"></td>
                  <td>
                    <span ng-hide="editRow">{{ item.name }}</span>
                    <input type="text" class="input-sm" ng-model="item.name" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.id }}</span>
                    <input type="text" class="input-sm" ng-model="item.id" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.thing1 }}</span>
                    <input type="text" class="input-sm" ng-model="item.thing1" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.thing2 }}</span>
                    <input type="text" class="input-sm" ng-model="item.thing2" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.thing3 }}</span>
                    <input type="text" class="input-sm" ng-model="item.thing3" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.thing4 }}</span>
                    <input type="text" class="input-sm" ng-model="item.thing4" ng-hide="!editRow" flash-td />
                  </td>
                  <td>
                    <span ng-hide="editRow">{{ item.thing5 }}</span>
                    <input type="text" class="input-sm" ng-model="item.thing5" ng-hide="!editRow" flash-td />
                  </td>
                </tr>
              </tbody>
            </table>
          </div>
        </form>
      </div>
    </div>
  </div>

</body>

</html>

＆＃13;

指令

在我的演示中，我正在闪烁td，但您可以通过使用已注释掉的row变量轻松更改它以闪现目标的表格行td变量。

app.directive('flashTd', flashTD);

function flashTD($timeout, $compile) {
    return {
      scope: {
        ngModel: '='
      },
      link: function($scope, elem, attrs) {

        // Set a watch on ng-model to wait for value change
        $scope.$watch('ngModel', function(newVal, oldVal) {
          if (newVal !== oldVal) {
            // Flash row
            // var row = angular.element(elem[0].parentNode.parentNode);

            // Flash td
            var td = angular.element(elem[0].parentNode);

            // Using a timeout to simulate remote data change
            $timeout(function() {

              if(td.hasClass('flash')) {
                td.removeClass('flash');
              }

              $timeout(function() {
                td.addClass('flash')
              })

            }, 2000)

           }
        })
      }
    }
  }

HTML元素

 <input type="text" class="input-sm" ng-model="item.thing2" ng-hide="!editRow" flash-td />

数据上的闪烁单元改变AngularJS

2 个答案:

指令

HTML元素