仿Angular Bootstrap TimePicker创建分钟数-秒数的输入控件

程序员文章站 2022-06-17 16:00:53

在一个项目中需要一个用来输入分钟数和秒数的控件，然而调查了一些开源项目后并未发现合适的控件。在angular bootstrap ui中有一个类似的控件timepicker...

在一个项目中需要一个用来输入分钟数和秒数的控件，然而调查了一些开源项目后并未发现合适的控件。在angular bootstrap ui中有一个类似的控件timepicker，但是它并没有深入到分钟和秒的精度。
因此，决定参考它的源码然后自己进行实现。
最终的效果如下：

首先是该directive的定义：

 app.directive('minutesecondpicker', function() {
 return {
 restrict: 'ea',
 require: ['minutesecondpicker', '?^ngmodel'],
 controller: 'minutesecondpickercontroller',
 replace: true,
 scope: {
  validity: '='
 },
 templateurl: 'partials/directives/minutesecondpicker.html',
 link: function(scope, element, attrs, ctrls) {
  var minutesecondpickerctrl = ctrls[0],
  ngmodelctrl = ctrls[1];

  if(ngmodelctrl) {
  minutesecondpickerctrl.init(ngmodelctrl, element.find('input'));
  }
 }
 };
});

在以上的link函数中，ctrls是一个数组： ctrls[0]是定义在本directive上的controller实例，ctrls[1]是ngmodelctrl，即ng-model对应的controller实例。这个顺序实际上是通过require: ['minutesecondpicker', '?^ngmodel']定义的。
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："?^ngmodel"，?的含义是即使没有找到该依赖，也不要抛出异常，即该依赖是一个可选项。^的含义是查找父元素的controller。
然后，定义该directive中用到的一些默认设置，通过constant directive实现：

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) ? 
  $scope.$parent.$eval($attrs.mousewheel) : minutesecondpickerconfig.mousewheel;
 if(mousewheel) {
  this.setupmousewheelevents(minutesinputel, secondsinputel);
 }

 $scope.readonlyinput = angular.isdefined($attrs.readonlyinput) ?
  $scope.$parent.$eval($attrs.readonlyinput) : minutesecondpickerconfig.readonlyinput;
 this.setupinputevents(minutesinputel, secondsinputel);
 };

init方法接受的第二个参数是inputs，在link函数中传入的是：element.find('input')。所以第一个输入框用来输入分钟，第二个输入框用来输入秒。
然后，检查是否覆盖了mousewheel属性，如果没有覆盖则使用在constant中设置的默认mousewheel，并进行相关设置如下：

// 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) ? e.wheeldata : -e.deltay;
  return (e.detail || delta > 0);
 };

 minutesinputel.bind('mousewheel wheel', function(e) {
  $scope.$apply((isscrollingup(e)) ? $scope.incrementminutes() : $scope.decrementminutes());
  e.preventdefault();
 });

 secondsinputel.bind('mousewheel wheel', function(e) {
  $scope.$apply((isscrollingup(e)) ? $scope.incrementseconds() : $scope.decrementseconds());
  e.preventdefault();
 });
 };

init方法最后会对inputs本身进行一些设置：

// 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', '?^ngmodel'],
 controller: 'minutesecondpickercontroller',
 replace: true,
 scope: {
  validity: '='
 },
 templateurl: 'partials/directives/minutesecondpicker.html',
 link: function(scope, element, attrs, ctrls) {
  var minutesecondpickerctrl = ctrls[0],
  ngmodelctrl = ctrls[1];

  if(ngmodelctrl) {
  minutesecondpickerctrl.init(ngmodelctrl, element.find('input'));
  }
 }
 };
});

app.constant('minutesecondpickerconfig', {
 minutestep: 1,
 secondstep: 1,
 readonlyinput: false,
 mousewheel: true
});

app.controller('minutesecondpickercontroller', ['$scope', '$attrs', '$parse', 'minutesecondpickerconfig', 
 function($scope, $attrs, $parse, minutesecondpickerconfig) {

 var selected = {
  minutes: 0,
  seconds: 0
 },
 ngmodelctrl = {
  $setviewvalue: angular.noop
 };

 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) ? 
  $scope.$parent.$eval($attrs.mousewheel) : minutesecondpickerconfig.mousewheel;
 if(mousewheel) {
  this.setupmousewheelevents(minutesinputel, secondsinputel);
 }

 $scope.readonlyinput = angular.isdefined($attrs.readonlyinput) ?
  $scope.$parent.$eval($attrs.readonlyinput) : minutesecondpickerconfig.readonlyinput;
 this.setupinputevents(minutesinputel, secondsinputel);
 };

 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);
 });
 }

 // 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) ? e.wheeldata : -e.deltay;
  return (e.detail || delta > 0);
 };

 minutesinputel.bind('mousewheel wheel', function(e) {
  $scope.$apply((isscrollingup(e)) ? $scope.incrementminutes() : $scope.decrementminutes());
  e.preventdefault();
 });

 secondsinputel.bind('mousewheel wheel', function(e) {
  $scope.$apply((isscrollingup(e)) ? $scope.incrementseconds() : $scope.decrementseconds());
  e.preventdefault();
 });
 };

 // 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);
  });
  }
 });
 };

 this.render = function() {
 var time = ngmodelctrl.$modelvalue ? {
  minutes: ngmodelctrl.$modelvalue.minutes,
  seconds: ngmodelctrl.$modelvalue.seconds
 } : null;

 // adjust the time for invalid value at first time
 if(time.minutes < 0) {
  time.minutes = 0;
 }
 if(time.seconds < 0) {
  time.seconds = 0;
 }

 var totalseconds = time.minutes * 60 + time.seconds;
 time = {
  minutes: math.floor(totalseconds / 60),
  seconds: totalseconds % 60
 };

 if(time) {
  selected = time;
  makevalid();
  updatetemplate();
 }
 };

 // call internally when the model is valid
 function refresh(keyboardchange) {
 makevalid();
 ngmodelctrl.$setviewvalue({
  minutes: selected.minutes,
  seconds: selected.seconds
 });
 updatetemplate(keyboardchange);
 }

 function makevalid() {
 ngmodelctrl.$setvalidity('time', true);
 $scope.validity = true;
 $scope.invalidminutes = false;
 $scope.invalidseconds = false;
 }

 function updatetemplate(keyboardchange) {
 var minutes = selected.minutes,
  seconds = selected.seconds;

 $scope.minutes = keyboardchange === 'm' ? minutes : pad(minutes);
 $scope.seconds = keyboardchange === 's' ? seconds : pad(seconds);
 }

 function pad(value) {
 return ( angular.isdefined(value) && value.tostring().length < 2 ) ? '0' + value : value;
 }

 function getminutesfromtemplate() {
 var minutes = parseint($scope.minutes, 10);
 return (minutes >= 0) ? minutes : undefined;
 }

 function getsecondsfromtemplate() {
 var seconds = parseint($scope.seconds, 10);
 if(seconds >= 60) {
  seconds = 59;
 }

 return (seconds >= 0) ? seconds : undefined;
 }

 $scope.incrementminutes = function() {
 addseconds(minutestep * 60);
 };

 $scope.decrementminutes = function() {
 addseconds(-minutestep * 60);
 };

 $scope.incrementseconds = function() {
 addseconds(secondstep);
 };

 $scope.decrementseconds = function() {
 addseconds(-secondstep);
 };

 function addseconds(seconds) {
 var newseconds = selected.minutes * 60 + selected.seconds + seconds;
 if(newseconds < 0) {
  newseconds = 0;
 }

 selected = {
  minutes: math.floor(newseconds / 60),
  seconds: newseconds % 60
 };

 refresh();
 }

 $scope.previewtime = function(minutes, seconds) {
 var totalseconds = parseint(minutes, 10) * 60 + parseint(seconds, 10),
  hh = pad(math.floor(totalseconds / 3600)),
  mm = pad(minutes % 60),
  ss = pad(seconds);

 return hh + ':' + mm + ':' + ss;
 };
}]);

对应的template实现：

<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> </td>
  <td>
  <a ng-click="incrementseconds()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-up"></span>
  </a>
  </td>
  <td> </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> </td>
  <td>
  <a ng-click="decrementseconds()" class="btn btn-link">
   <span class="glyphicon glyphicon-chevron-down"></span>
  </a>
  </td>
  <td> </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="s as s.name for s in sourcetags" options="{ addable: 'true' }"></tags>
 </div>
 </div>
</div>
<div class="modal-footer">
 <button class="btn btn-primary" ng-click="ok()" ng-disabled="!starttimevalidity || !endtimevalidity || durationincorrect(endtime, starttime)">ok</button>
 <button class="btn btn-warning" ng-click="cancel()">cancel</button>
</div>

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