Angular 常用指令实例总结整理

发布于 2017-05-09 09:05:24 | 108 次阅读 | 评论: 0 | 来源: 网友投递

AngularJS 前端JS框架

AngularJS诞生于Google是一款优秀的前端JS框架，已经被用于Google的多款产品当中。AngularJS有着诸多特性，最为核心的是：MVC、模块化、自动化双向数据绑定、语义化标签、依赖注入，等等。

这篇文章主要介绍了Angular 常用指令实例总结整理的相关资料,本文整理了常用指令，大家可以参考使用，需要的朋友可以参考下

Angular 常用指令

已经用了angular很久积累了一些很实用的指令，需要的话直接拿走用，有问题大家一起交流

1.focus时，input:text内容全选


angular.module('my.directives').directive('autoselect', [function () {
  return {
    restrict: 'A',
    link: function (scope, element, attr) {
      if (element.is("input") && attr.type === "text") {
        var selected = false;
        var time = parseInt(attr["autoselect"]);
        element.bind("mouseup", function (e) {
          if (selected) {
            e.preventDefault();
            e.stopPropagation();
          }
          selected = false;
        });
        if (time > 0) {
          element.bind("focus", function (event) {
            setTimeout(function () {
              selected = true;
              event.target.select();
            }, time);
          });
        } else {
          element.bind("focus", function (event) {
            selected = true;
            event.target.select();
          });

        }
      }
    }
  };
}]);

2.clickOutside指令，外部点击时触发,click-outside="func()" func为自己指定的方法，一般为关闭当前层的方法，inside-id="" 点击指定id的输入框时，当前层不关闭


angular.module('my.directives').directive('clickOutside', ['$document', function ($document) {
  return {
    restrict: 'A',
    link: function (scope, element, attrs) {
      $(element).bind('mousedown', function (e) {
        e.preventDefault();
        e.stopPropagation();
      });

      $("#" + attrs["insideId"]).bind('mousedown', function (e) {
        e.stopPropagation();
      });

      $("#" + attrs["insideId"]).bind('blur', function (e) {
        setTimeout(function () {
          scope.$apply(attrs.clickOutside);
        });
      });

      $document.bind('mousedown', function () {
        scope.$apply(attrs.clickOutside);
      });
    }
  };
}]);

3.clickInside指令，内部点击时触发


angular.module('my.directives').directive('clickInside', ['$document', function ($document) {
  return {
    restrict: 'A',
    link: function (scope, element, attrs, ctrl) {
      $(element).bind('focus click', function (e) {
        scope.$apply(attrs.clickInside);
        e.stopPropagation();
      });
    }
  };
}]);

4.scrollInside 指令，内部滚动时触发


angular.module('my.directives').directive('scrollInside', function () {
  return {
    restrict: 'A',
    link: function (scope, element, attrs, ctrl) {
      $(element).bind('scroll', function (e) {
        scope.$apply(attrs.scrollInside);
        e.stopPropagation();
      });
    }
  };
});

5. bindKeyBoardEvent指令，内部获得焦点或者点击时触发


angular.module('my.directives').directive('bindKeyBoardEvent', function () {
  return {
    restrict: 'A',
    link: function (scope, element, attrs, ctrl) {
      $(element).bind('focus click', function (e) {
        scope.$apply(attrs.bindKeyBoardEvent);
        e.stopPropagation();
      });
    }
  };
});

6. myDraggable 使元素可拖动


angular.module('my.directives').directive('myDraggable', ['$parse', function ($parse) {
  return {
    restrict: 'A',
    link: function (scope, element, attr) {
      if (attr["modal"] !== undefined) {
        scope.$watch(attr["modal"], function (newValue) {
          if (newValue) {
            setTimeout(function () {
              $(".modal").draggable({handle: ".modal-header"});
            }, 100);
          } else {
            $(".modal").attr("style", "");
          }
        }, true);
        $(window).resize(function () {
          $(".modal").attr("style", "");
        });
      } else {
        element.draggable($parse(attr["hrDraggable"])(scope));
      }
    }
  };
}]);

6.myResizable 使元素可拖拽改变尺寸大小


angular.module('my.directives').directive('myResizable', ['$parse', function ($parse) {
  return {
    restrict: 'A',
    link: function (scope, element, attr) {
      if (attr["modal"] !== undefined) {
        scope.$watch(attr["modal"], function (newValue) {
          if (newValue) {
            setTimeout(function () {
              $(".modal").resizable({handles: "e, w"});
            }, 100);
          }
        }, true);
      } else {
        element.resizable($parse(attr["hrResizable"])(scope));
      }
    }
  };
}]);

6. conditionFocus 作为一个元素的属性存在：如果监听的表达式值为true，则将焦点放到本元素上。


angular.module('my.directives').directive("conditionFocus", [function () {
  return function (scope, element, attrs) {
    var dereg = scope.$watch(attrs.conditionFocus, function (newValue) {
      if (newValue) {
        element.focus();
      }
    });
    element.bind("$destroy", function () {
      if (dereg) {
        dereg();
      }
    });
  };
}]);

7.scrollToHide 滚动到顶部的时候触发


angular.module('my.directives').directive("scrollToHide", [function () {
  return function (scope, element, attrs) {
    var height= parseFloat(attrs.maxHeight)
    $(window).scroll(function(){
      var scrollTop= document.body.scrollTop||document.documentElement.scrollTop;
       if(scrollTop>height){
         $parse(attrs.ngShow).assign(scope, false);
       }else{
         $parse(attrs.ngShow).assign(scope, true);
       }


    })

  };
}]);

8.resetToZero 作为一个元素的属性存在：如果监听的表达式值为true，则将本元素中所绑定的ngModel值设为0


angular.module('my.directives').directive("resetToZero", ["$parse", function ($parse) {
  return function (scope, element, attrs) {
    var dereg = scope.$watch(attrs.resetToZero, function (newValue) {
      if (newValue) {
        if (attrs.ngModel) {
          $parse(attrs.ngModel).assign(scope, 0);
        }
      }
    });
    element.bind("$destroy", function () {
      if (dereg) {
        dereg();
      }
    });
  };
}]);

9.resetToEmptyString 作为一个元素的属性存在：如果监听的表达式值为true，则将本元素中所绑定的ngModel值设为空字符串。


angular.module('my.directives').directive("resetToEmptyString", ["$parse", function ($parse) {
  return function (scope, element, attrs) {
    var dereg = scope.$watch(attrs.resetToEmptyString, function (newValue) {
      if (newValue) {
        if (attrs.ngModel) {
          var _getter = $parse(attrs.ngModel);
          if (_getter(scope)) {
            _getter.assign(scope, "");
          } else {
            _getter.assign(scope.$parent, "");
          }
        }
      }
    });
    element.bind("$destroy", function () {
      if (dereg) {
        dereg();
      }
    });
  };
}]);

10. numberOnly 输入框内容仅限数值的指令(输入内容不允许为负值),可以设定最大值（max属性）


angular.module('my.directives').directive("numberOnly", ["$parse", function ($parse) {
  return function (scope, element, attrs) {
    element.bind("keyup", function () {
      if(event.keyCode==37||event.keyCode== 39){
        return false;
      }
      var val = element.val().replace(/[^\d.]/g, '');
      if(attrs.max){
        if(val>parseInt(attrs.max)){
          val=attrs.max;
        }
      }
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
    element.bind("afterpaste", function () {
      var val = element.val().replace(/[^\d.]/g, '');
      if(attrs.max){
        if(val>parseInt(attrs.max)){
          val=attrs.max;
        }
      }
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
  };
}]);

11. upperCaseOnly 输入框自动转换成大写


angular.module('my.directives').directive("upperCaseOnly", ["$parse", function ($parse) {
  return function (scope, element, attrs) {
    element.bind("keyup", function () {
      var val = element.val().toUpperCase();
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
    element.bind("afterpaste", function () {
      var val =element.val().toUpperCase();
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
  };
}]);

12. noSpecialString 输入框内容不能为特殊字符


angular.module('my.directives').directive("noSpecialString", ["$parse", function ($parse) {
  return function (scope, element, attrs) {
    element.bind("keyup", function () {
      var val = element.val().replace(/[\W]/g, '');
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
    element.bind("afterpaste", function () {
      var val = element.val().replace(/[^\d]/g, '');
      element.val(val);
      if (attrs.ngModel) {
        $parse(attrs.ngModel).assign(scope, val);
      }
      return false;
    });
  };
}]);

13. round2bit 输入框失去焦点保留两位小数


angular.module('my.directives').directive("round2bit", ['$parse', '$filter', function ($parse, $filter) {
  return function ($scope, element, attrs) {
    element.blur(function () {
      if (attrs.ngModel) {
        var _getter = $parse(attrs.ngModel);
        var _numberStr2Round = (_getter($scope) || 0);
        _getter.assign($scope, $filter('number')(_numberStr2Round, 2).split(",").join(""));
        $scope.$apply();
      }
    });
  };
}]);

14.SelfHeight dom编译期设置元素高度，可以接受数字或者表达式


angular.module('hr.directives').directive('SelfHeight', ['$timeout', function ($timeout) {
  function _resizeElement(element, SelfHeight) {
    element.height((typeof SelfHeight === "number") ? SelfHeight : eval(SelfHeight));
  };

  return {
    priority: 1000,
    link: function (scope, element, attrs) {
      var hrSelfHeight = attrs["SelfHeight"];
      var on = attrs["on"];
      if (on) {
        $(window).resize(function () {
          _resizeElement(element, scope.$eval(SelfHeight));
        });
        scope.$watch(on, function () {
          $timeout(function () {
            _resizeElement(element, scope.$eval(SelfHeight));
          }, 100);
        }, true);
      } else {
        $(window).resize(function () {
          _resizeElement(element, SelfHeight);
        });
        _resizeElement(element, SelfHeight);
      }
    }
  };
}]);

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