如何在AngularJS中使用按键事件?

我想捕捉下面文本框上的回车键事件。为了更清楚地说明这一点，我使用ng-repeat填充tbody。下面是HTML:

<td><input type="number" id="closeqty{{$index}}" class="pagination-right closefield" 
    data-ng-model="closeqtymodel" data-ng-change="change($index)" required placeholder="{{item.closeMeasure}}" /></td>

这是我的模块:

angular.module('components', ['ngResource']);

我使用一个资源来填充表，我的控制器代码是:

function Ajaxy($scope, $resource) {
//controller which has resource to populate the table 
}

当前回答

我为我的项目做的一些代码示例。基本上你向你的实体添加标签。想象一下你有输入文本，在输入标签名称时，你会得到一个带有预加载标签的下拉菜单，你可以用箭头导航，然后用Enter选择:

HTML + AngularJS v1.2.0-rc.3

    <div>
        <form ng-submit="addTag(newTag)">
            <input id="newTag" ng-model="newTag" type="text" class="form-control" placeholder="Enter new tag"
                   style="padding-left: 10px; width: 700px; height: 33px; margin-top: 10px; margin-bottom: 3px;" autofocus
                   data-toggle="dropdown"
                   ng-change="preloadTags()"
                   ng-keydown="navigateTags($event)">
            <div ng-show="preloadedTags.length > 0">
                <nav class="dropdown">
                    <div class="dropdown-menu preloadedTagPanel">
                        <div ng-repeat="preloadedTag in preloadedTags"
                             class="preloadedTagItemPanel"
                             ng-class="preloadedTag.activeTag ? 'preloadedTagItemPanelActive' : '' "
                             ng-click="selectTag(preloadedTag)"
                             tabindex="{{ $index }}">
                            <a class="preloadedTagItem"
                               ng-class="preloadedTag.activeTag ? 'preloadedTagItemActive' : '' "
                               ng-click="selectTag(preloadedTag)">{{ preloadedTag.label }}</a>
                        </div>
                    </div>
                </nav>
            </div>
        </form>
    </div>

Controller.js

$scope.preloadTags = function () {
    var newTag = $scope.newTag;
    if (newTag && newTag.trim()) {
        newTag = newTag.trim().toLowerCase();

        $http(
            {
                method: 'GET',
                url: 'api/tag/gettags',
                dataType: 'json',
                contentType: 'application/json',
                mimeType: 'application/json',
                params: {'term': newTag}
            }
        )
            .success(function (result) {
                $scope.preloadedTags = result;
                $scope.preloadedTagsIndex = -1;
            }
        )
            .error(function (data, status, headers, config) {
            }
        );
    } else {
        $scope.preloadedTags = {};
        $scope.preloadedTagsIndex = -1;
    }
};

function checkIndex(index) {
    if (index > $scope.preloadedTags.length - 1) {
        return 0;
    }
    if (index < 0) {
        return $scope.preloadedTags.length - 1;
    }
    return index;
}

function removeAllActiveTags() {
    for (var x = 0; x < $scope.preloadedTags.length; x++) {
        if ($scope.preloadedTags[x].activeTag) {
            $scope.preloadedTags[x].activeTag = false;
        }
    }
}

$scope.navigateTags = function ($event) {
    if (!$scope.newTag || $scope.preloadedTags.length == 0) {
        return;
    }
    if ($event.keyCode == 40) {  // down
        removeAllActiveTags();
        $scope.preloadedTagsIndex = checkIndex($scope.preloadedTagsIndex + 1);
        $scope.preloadedTags[$scope.preloadedTagsIndex].activeTag = true;
    } else if ($event.keyCode == 38) {  // up
        removeAllActiveTags();
        $scope.preloadedTagsIndex = checkIndex($scope.preloadedTagsIndex - 1);
        $scope.preloadedTags[$scope.preloadedTagsIndex].activeTag = true;
    } else if ($event.keyCode == 13) {  // enter
        removeAllActiveTags();
        $scope.selectTag($scope.preloadedTags[$scope.preloadedTagsIndex]);
    }
};

$scope.selectTag = function (preloadedTag) {
    $scope.addTag(preloadedTag.label);
};

CSS + Bootstrap v2.3.2

.preloadedTagPanel {
    background-color: #FFFFFF;
    display: block;
    min-width: 250px;
    max-width: 700px;
    border: 1px solid #666666;
    padding-top: 0;
    border-radius: 0;
}

.preloadedTagItemPanel {
    background-color: #FFFFFF;
    border-bottom: 1px solid #666666;
    cursor: pointer;
}

.preloadedTagItemPanel:hover {
    background-color: #666666;
}

.preloadedTagItemPanelActive {
    background-color: #666666;
}

.preloadedTagItem {
    display: inline-block;
    text-decoration: none;
    margin-left: 5px;
    margin-right: 5px;
    padding-top: 5px;
    padding-bottom: 5px;
    padding-left: 20px;
    padding-right: 10px;
    color: #666666 !important;
    font-size: 11px;
}

.preloadedTagItem:hover {
    background-color: #666666;
}

.preloadedTagItemActive {
    background-color: #666666;
    color: #FFFFFF !important;
}

.dropdown .preloadedTagItemPanel:last-child {
    border-bottom: 0;
}

2013-11-13 10:10:00

其他回答

这是我在开发一个有类似需求的应用程序时得出的结论，它不需要写一个指令，它是相对简单的告诉它做什么:

<input type="text" ng-keypress="($event.charCode==13)?myFunction():return" placeholder="Will Submit on Enter">

2015-05-29 21:20:06

另一种方法是使用标准指令ng-keypress="myFunct($event)"

然后在你的控制器中你可以有:

...

$scope.myFunct = function(keyEvent) {
  if (keyEvent.which === 13)
    alert('I am an alert');
}

...

2013-09-05 00:18:42

这是我的指示:

mainApp.directive('number', function () {
    return {
        link: function (scope, el, attr) {
            el.bind("keydown keypress", function (event) {
                //ignore all characters that are not numbers, except backspace, delete, left arrow and right arrow
                if ((event.keyCode < 48 || event.keyCode > 57) && event.keyCode != 8 && event.keyCode != 46 && event.keyCode != 37 && event.keyCode != 39) {
                    event.preventDefault();
                }
            });
        }
    };
});

用法:

<input number />

2016-04-18 10:30:02

你也可以把它应用到父元素的控制器上。此示例可用于通过按上下方向键突出显示表中的一行。

app.controller('tableCtrl', [ '$scope', '$element', function($scope, $element) {
  $scope.index = 0; // row index
  $scope.data = []; // array of items
  $scope.keypress = function(offset) {
    console.log('keypress', offset);
    var i = $scope.index + offset;
    if (i < 0) { i = $scope.data.length - 1; }
    if (i >= $scope.data.length) { i = 0; }
  };
  $element.bind("keydown keypress", function (event) {
    console.log('keypress', event, event.which);
    if(event.which === 38) { // up
      $scope.keypress(-1);
    } else if (event.which === 40) { // down
      $scope.keypress(1);
    } else {
      return;
    }
    event.preventDefault();
  });
}]);


<table class="table table-striped" ng-controller="tableCtrl">
<thead>
    <tr>
        <th ng-repeat="(key, value) in data[0]">{{key}}</th>
    </tr>
</thead>
<tbody>
    <tr ng-repeat="row in data track by $index" ng-click="draw($index)" ng-class="$index == index ? 'info' : ''">
        <td ng-repeat="(key, value) in row">{{value}}</td>
    </tr>
</tbody>
</table>

2014-05-07 17:21:25

这是对EpokK答案的扩展。

我有同样的问题，必须调用一个作用域函数时，enter被推到一个输入字段。但是，我还想将输入字段的值传递给指定的函数。这是我的解决方案:

app.directive('ltaEnter', function () {
return function (scope, element, attrs) {
    element.bind("keydown keypress", function (event) {
        if(event.which === 13) {
          // Create closure with proper command
          var fn = function(command) {
            var cmd = command;
            return function() {
              scope.$eval(cmd);
            };
          }(attrs.ltaEnter.replace('()', '("'+ event.target.value +'")' ));

          // Apply function
          scope.$apply(fn);

          event.preventDefault();
        }
    });
};

});

在HTML中的用法如下:

<input type="text" name="itemname" lta-enter="add()" placeholder="Add item"/>

向EpokK的回答致敬。

2014-11-18 22:10:39

如何在AngularJS中使用按键事件?

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