app.directive('minuteSecondPicker', function() {
 return {
 restrict: 'EA',
 require: ['minuteSecondPicker', '"color: #800000">注意到第一个依赖就是directive本身的名字，此时会将该directive中controller声明的对应实例传入。第二个依赖的写法有些奇怪：""，"htmlcode">

app.constant('minuteSecondPickerConfig', {
 minuteStep: 1,
 secondStep: 1,
 readonlyInput: false,
 mousewheel: true
}); 



紧接着是directive对应的controller，它的声明如下：




 app.controller('minuteSecondPickerController', ['$scope', '$attrs', '$parse', 'minuteSecondPickerConfig', 
 function($scope, $attrs, $parse, minuteSecondPickerConfig) {
 ...
}]); 


在directive的link函数中，调用了此controller的init方法：




 this.init = function(ngModelCtrl_, inputs) {
 ngModelCtrl = ngModelCtrl_;
 ngModelCtrl.$render = this.render;

 var minutesInputEl = inputs.eq(0),
  secondsInputEl = inputs.eq(1);

 var mousewheel = angular.isDefined($attrs.mousewheel) "htmlcode">

// respond on mousewheel spin
 this.setupMousewheelEvents = function(minutesInputEl, secondsInputEl) {
 var isScrollingUp = function(e) {
  if(e.originalEvent) {
  e = e.originalEvent;
  }

  // pick correct delta variable depending on event
  var delta = (e.wheelData) "htmlcode">

// respond on direct input
 this.setupInputEvents = function(minutesInputEl, secondsInputEl) {
 if($scope.readonlyInput) {
  $scope.updateMinutes = angular.noop;
  $scope.updateSeconds = angular.noop;
  return;
 }

 var invalidate = function(invalidMinutes, invalidSeconds) {
  ngModelCtrl.$setViewValue(null);
  ngModelCtrl.$setValidity('time', false);
  $scope.validity = false;
  if(angular.isDefined(invalidMinutes)) {
  $scope.invalidMinutes = invalidMinutes;
  }
  if(angular.isDefined(invalidSeconds)) {
  $scope.invalidSeconds = invalidSeconds;
  }
 };

 $scope.updateMinutes = function() {
  var minutes = getMinutesFromTemplate();

  if(angular.isDefined(minutes)) {
  selected.minutes = minutes;
  refresh('m');
  } else {
  invalidate(true);
  }
 };

 minutesInputEl.bind('blur', function(e) {
  if(!$scope.invalidMinutes && $scope.minutes < 10) {
  $scope.$apply(function() {
   $scope.minutes = pad($scope.minutes);
  });
  }
 });

 $scope.updateSeconds = function() {
  var seconds = getSecondsFromTemplate();

  if(angular.isDefined(seconds)) {
  selected.seconds = seconds;
  refresh('s');
  } else {
  invalidate(undefined, true);
  }
 };

 secondsInputEl.bind('blur', function(e) {
  if(!$scope.invalidSeconds && $scope.seconds < 10) {
  $scope.$apply(function() {
   $scope.seconds = pad($scope.seconds);
  });
  }
 });
 }; 




此方法中，声明了用于设置输入非法的invalidate函数，它会在scope中暴露一个validity = false属性让页面有机会做出合适的反应。

 如果用户使用了一个变量来表示minuteStep或者secondStep，那么还需要设置相应的watchers：




var minuteStep = minuteSecondPickerConfig.minuteStep;
 if($attrs.minuteStep) {
 $scope.parent.$watch($parse($attrs.minuteStep), function(value) {
  minuteStep = parseInt(value, 10);
 });
 }

 var secondStep = minuteSecondPickerConfig.secondStep;
 if($attrs.secondStep) {
 $scope.parent.$watch($parse($attrs.secondStep), function(value) {
  secondStep = parseInt(value, 10);
 });
 } 




完整的directive实现代码如下：




var app = angular.module("minuteSecondPickerDemo");

app.directive('minuteSecondPicker', function() {
 return {
 restrict: 'EA',
 require: ['minuteSecondPicker', '"htmlcode">

<table>
 <tbody>
 <tr class="text-center">
  <td>
  <a ng-click="incrementMinutes()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-up"></span>
  </a>
  </td>
  <td>&nbsp;</td>
  <td>
  <a ng-click="incrementSeconds()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-up"></span>
  </a>
  </td>
  <td>&nbsp;</td>
 </tr>
 <tr>
  <td style="width:50px;" class="form-group" ng-class="{'has-error': invalidMinutes}">
  <input type="text" ng-model="minutes" ng-change="updateMinutes()" class="form-control text-center" ng-mousewheel="incrementMinutes()" ng-readonly="readonlyInput" maxlength="3">
  </td>
  <td>:</td>
  <td style="width:50px;" class="form-group" ng-class="{'has-error': invalidSeconds}">
  <input type="text" ng-model="seconds" ng-change="updateSeconds()" class="form-control text-center" ng-mousewheel="incrementSeconds()" ng-readonly="readonlyInput" maxlength="2">
  <td>
  <!-- preview column -->
  <td>
  <span class="label label-primary" ng-show="validity">
   {{ previewTime(minutes, seconds) }}
  </span>
  </td>
 </tr>
 <tr class="text-center">
  <td>
  <a ng-click="decrementMinutes()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-down"></span>
  </a>
  </td>
  <td>&nbsp;</td>
  <td>
  <a ng-click="decrementSeconds()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-down"></span>
  </a>
  </td>
  <td>&nbsp;</td>
 </tr>
 </tbody>
</table> 



测试代码(即前面截图dialog的源代码)：




 <div class="modal-header">
 <h3 class="modal-title">Highlight on <span class="label label-primary">{{ movieName }}</span></h3>
</div>
<div class="modal-body">

 <div class="row">
 <div id="highlight-start" class="col-xs-6">
  <h4>Start Time:</h4>
  <minute-second-picker ng-model="startTime" validity="startTimeValidity"></minute-second-picker>
 </div>

 <div id="highlight-end" class="col-xs-6">
  <h4>End Time:</h4>
  <minute-second-picker ng-model="endTime" validity="endTimeValidity"></minute-second-picker>
 </div>
 </div>
 <div class="row">
 <div class="col-xs-2">
  Tags:
 </div>
 <div class="col-xs-10">
  <tags model="tags" src="/UploadFiles/2021-04-02/s as s.name for s in sourceTags">

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