web学习笔记10-自定义时间选择器指令编写

    好久没有更新了,最近在做一个前端angularJs项目,内容比较复杂,幸好都不算太难。前两天自己写了个简单的时间选择器,但是水平有限,写的代码量稍微有点大,就想着封装成一个指令,暴露出小时和分钟,以便在控制器中获取到,并且发送到后台。不过,之前虽然一直在写angular,指令也接触到不少,但是一直是在使用别人写好的,自己写还是第一次,就想着,正好利用下这个机会,自己尝试些一个简单点的指令也挺好的。

    这里我还是按照往常习惯一样,先贴github地址,毕竟看那么长的东西也是太累了。angular-timepicker

    效果图如图:
时间选择器效果.gif

    点击上下小三角可以变换时间,点击获取时间的按钮可以弹出提示框显示选择的时间,并且在控制台中打印出来。其实这些写起来并不是很难,在写指令的时候可能对大多数前端的小伙伴来说都不算难事,不过说实话,一年前左右刚接触angular的时候,其实已经在慕课网上看过大漠清秋讲的angular课程,当时初接触前端,看了他讲的指令,其实也没看懂。昨晚回去又看了一遍他讲的课,发现理解了一点了,正好昨天在写指令的时候遇到一些小问题,今天早上也是迎刃而解了。

    下面我就不废话了,直接写代码了,我把这个指令单独写成一个demo了。所以大家要是想使用的话,只需要下载之后复制粘贴就ok了。

第一步:编写html

    先编写出html来,把基本的页面编写出来:

html
<div class="co-timepicker-box" style="margin-left: 15px">
    <input type="text" class="fl wi-timepicker-timeinput" ng-model="hour" maxlength="2">
       <div class="fl wi-timepicker-change-box">
        <div class="wi-timepicker-change-time arrow-up" ng-click="timeUp(1)"></div>
        <div class="wi-timepicker-change-time arrow-down" ng-click="timeDown(1)"></div>
    </div>
    <div class="fl wi-timepicker-maohao">
          :
    </div>
    <input type="text" class="fl wi-timepicker-timeinput" ng-model="minute" maxlength="2">
    <div class="fl wi-timepicker-change-box">
        <div class="wi-timepicker-change-time arrow-up" ng-click="timeUp(2)"></div>
        <div class="wi-timepicker-change-time arrow-down" ng-click="timeDown(2)"></div>
    </div>
</div>

第二步:编写css

css
/* timepicker start */
.co-timepicker-box {
    float: left;
    width: 110px;
    height: 32px;
    border: 1px solid #cccccc;
}

.fl{
    float: left;
}
.wi-timepicker-timeinput{
    width: 35px;
    height: 30px;
    padding: 0;
    font-size: 20px;
    text-align: center;
    line-height: 30px;
    border:0;
    outline: none;
}

.wi-timepicker-change-box{
       width: 15px;
    height: 30px;
    border:0;
}
.wi-timepicker-change-time{
    width: 15px;
    height: 15px;
    border: 0;
}
.wi-timepicker-maohao{
    width: 7px;
    height: 30px;
    font-size: 16px;
    text-align: center;
    line-height: 30px;
}
.arrow-up{
    background: url("../img/time-up.png")no-repeat center center;
    background-size: 14px 6px;
}
.arrow-down{
    background: url("../img/time-down.png")no-repeat center center;
    background-size: 14px 6px;
}
/* timepicker end */

第三步:编写js

    页面基本完成。之后就是js编写,js中主要需要注意的是,小时和分钟在个位数的时候前面需要加上0,在小时0往下是23,分钟往下是59,这个需要单独的一个方法。然后就是给小时分钟赋初始值。然后就是点击方法。

js
//转换格式的方法
$scope.PrefixInteger = function (num, n) {
    return (Array(n).join(0) + num).slice(-n);
};
//时间选择器的处理
if(!$scope.hour){
    $scope.hour = 12;
}
if(!$scope.minute){
    $scope.minute = '00';
}
var reg=/^\d+$/;
$scope.timeUp = function (type) {
    if(type == 1){
        if(reg.test($scope.hour)){
            if(parseInt($scope.hour) >=0 && parseInt($scope.hour) <= 23){
                if($scope.hour == 23){
                    $scope.hour = -1;
                }
                $scope.hour = parseInt($scope.hour) + 1;
            }else {
                $scope.hour = 12;
            }
        }else {
            $scope.hour = 12;
        }
         $scope.hour = $scope.PrefixInteger($scope.hour,2);
    }else if(type == 2){
        if(angular.isNumber($scope.minute) || reg.test($scope.minute)){
            if(parseInt($scope.minute) >=0 && parseInt($scope.minute) <=59){
                if($scope.minute == 59){
                    $scope.minute = -1;
                }
                $scope.minute = parseInt($scope.minute) + 1;
             }else {
                 $scope.minute = 0;
             }
         }else {
             $scope.minute = 0;
         }
         $scope.minute = $scope.PrefixInteger($scope.minute,2);
         }
    };
    $scope.timeDown = function (type) {
        if(type == 1){
            if(angular.isNumber($scope.hour) || reg.test($scope.hour)){
                if(parseInt($scope.hour) >=0 && parseInt($scope.hour) <=24){
                    if($scope.hour == 0){
                           $scope.hour = 24;
                    }
                    $scope.hour = parseInt($scope.hour) - 1;
            }else {
                 $scope.hour = 12;
            }
        }else {
            $scope.hour = 12;
        }
         $scope.hour = $scope.PrefixInteger($scope.hour,2)
        }else  if(type == 2){
              if(angular.isNumber($scope.minute) || reg.test($scope.minute)){
                if(parseInt($scope.minute) >=0 && parseInt($scope.minute) <=60){
                    if($scope.minute == 0){
                           $scope.minute = 60;
                    }
                      $scope.minute = parseInt($scope.minute) - 1;
                   }else {
                       $scope.minute = 0;
                   }
               }else {
                   $scope.minute = 0;
               }
                $scope.minute = $scope.PrefixInteger($scope.minute,2);
           }
        };

    以上就是完成了基本的编写,下面就是要写指令了,需要把上面的东西都添加到指令中。

第四步:编写指令

directive
  var app = angular.module('myApp', []);
  app.directive("coTimepicker", function() {
return {
    restrict:'AE',
    scope:{
        hour:'=',
        minute:'='
    },
    template:'<div class="co-timepicker-box" style="margin-left: 15px">'+
    '<input type="text" class="fl wi-timepicker-timeinput" ng-model="hour" maxlength="2">' +
    '<div class="fl wi-timepicker-change-box">' +
    '<div class="wi-timepicker-change-time arrow-up" ng-click="timeUp(1)"></div>' +
    '<div class="wi-timepicker-change-time arrow-down" ng-click="timeDown(1)"></div>' +
    '</div>' +
    '<div class="fl wi-timepicker-maohao">' +
    ':' +
    '</div>' +
    '<input type="text" class="fl wi-timepicker-timeinput" ng-model="minute" maxlength="2">' +
    '<div class="fl wi-timepicker-change-box">' +
    '<div class="wi-timepicker-change-time arrow-up" ng-click="timeUp(2)"></div>' +
    '<div class="wi-timepicker-change-time arrow-down" ng-click="timeDown(2)"></div>' +
    '</div>'+
    '</div>',
    link: function ($scope,element,attrs) {
        $scope.PrefixInteger = function (num, n) {
            return (Array(n).join(0) + num).slice(-n);
        };
        //--------------------------------------
        if(!$scope.hour){
            $scope.hour = 12;
        }
        if(!$scope.minute){
            $scope.minute = '00';
        }
        var reg=/^\d+$/;
        $scope.timeUp = function (type) {
            if(type == 1){
                if(reg.test($scope.hour)){
                    if(parseInt($scope.hour) >=0 && parseInt($scope.hour) <= 23){
                        if($scope.hour == 23){
                            $scope.hour = -1;
                        }
                        $scope.hour = parseInt($scope.hour) + 1;
                    }else {
                        $scope.hour = 12;
                    }
                }else {
                    $scope.hour = 12;
                }
                $scope.hour = $scope.PrefixInteger($scope.hour,2);
            }else if(type == 2){
                if(angular.isNumber($scope.minute) || reg.test($scope.minute)){
                    if(parseInt($scope.minute) >=0 && parseInt($scope.minute) <=59){
                        if($scope.minute == 59){
                            $scope.minute = -1;
                        }
                        $scope.minute = parseInt($scope.minute) + 1;
                    }else {
                        $scope.minute = 0;
                    }
                }else {
                    $scope.minute = 0;
                }
                $scope.minute = $scope.PrefixInteger($scope.minute,2);
            }
        };
        $scope.timeDown = function (type) {
            if(type == 1){
                if(angular.isNumber($scope.hour) || reg.test($scope.hour)){
                    if(parseInt($scope.hour) >=0 && parseInt($scope.hour) <=24){
                        if($scope.hour == 0){
                            $scope.hour = 24;
                        }
                        $scope.hour = parseInt($scope.hour) - 1;
                    }else {
                        $scope.hour = 12;
                    }
                }else {
                    $scope.hour = 12;
                }
                $scope.hour = $scope.PrefixInteger($scope.hour,2)
            }else  if(type == 2){
                if(angular.isNumber($scope.minute) || reg.test($scope.minute)){
                    if(parseInt($scope.minute) >=0 && parseInt($scope.minute) <=60){
                        if($scope.minute == 0){
                            $scope.minute = 60;
                        }
                        $scope.minute = parseInt($scope.minute) - 1;
                    }else {
                        $scope.minute = 0;
                    }
                }else {
                    $scope.minute = 0;
                }
                $scope.minute = $scope.PrefixInteger($scope.minute,2);
            }
        };
    }
}});

第五步:使用指令

    指令写完之后,需要使用的,所以在html上写上指令

<co-timepicker hour="hour" minute="minute"></co-timepicker>

在控制器中可以获取到小时和分钟。同时也是可以在html上写死。在控制器中可以只用使用$scope.hour$scope.minute来获取小时和分钟。

    其实这样就算是已经编写完成,可以直接使用了,昨天我没有搞清楚指令内作用域scope里面的一些用法,导致没法提取出小时和分钟,晚上研究了之后发现其实不算难,这里我也就不讲一些指令的基础了,毕竟我自己也没有搞太明白。很多时候,基础稍微看下之后,应该直接跟着实例去实践,实践之后才能知道一些光看基础不知道的东西。

    感觉自己写东西还是有点乱,没有说的很清楚。不过大家在github上下载下来一看就能明白了,其实这个指令我个人觉得还有待改进,而且难度也不算高,算是比较简单的额指令了。当初也是没找到合适的第三方才自己写了一个。之后还是会继续学习封装控件做成指令。分享出来给大家看看,指导指导。希望大家看到有问题的直接评论或者私信我给我指正。谢谢