原生JS封装拖动验证滑块的实现代码示例

前言

星期六闲着没事，就想着写写原生js玩玩，在网上看了几个效果后决定做这个效果，并且使用了prototype和eventemitter封装成了库。

最终效果

 

分析

看到这个效果我们首先应该想到和拖动有关的api: onmousedown, onmousemove, onmouseup

其次要支持用户传入放置这个组件的dom元素和完成的回调事件。

最终如何使用？

我们先来看下使用方式，再来决定我们怎么编写这个库

具体使用就是这样的，我们还想用户能通过import等方式使用，所以我们就要支持esmoudule的导入方式。

编写库的整体初始框架

(function () {
 // =================代码块1=========================================
 var root = (typeof self == 'object' && self.self == self && self) ||
  (typeof global == 'object' && global.global == global && global) ||
  this || {}; 
 var util = {
  extend: function (target) {
   for (var i = 1, len = arguments.length; i < len; i++) {
    for (var prop in arguments[i]) {
     if (arguments[i].hasownproperty(prop)) {
      target[prop] = arguments[i][prop]
     }
    }
   }
   return target
  },
  isvalidlistener: function (listener) {
   if (typeof listener === 'function') {
    return true
   } else if (listener && typeof listener === 'object') {
    return util.isvalidlistener(listener.listener)
   } else {
    return false
   }
  },
  addcss: function (csstext) {
   var style = document.createelement('style'), //创建一个style元素
    head = document.head || document.getelementsbytagname('head')[0]; //获取head元素
   style.type = 'text/css'; //这里必须显示设置style元素的type属性为text/css，否则在ie中不起作用
   if (style.stylesheet) { //ie
    var func = function () {
     try { //防止ie中stylesheet数量超过限制而发生错误
      style.stylesheet.csstext = csstext;
     } catch (e) {

     }
    }
    //如果当前stylesheet还不能用，则放到异步中则行
    if (style.stylesheet.disabled) {
     settimeout(func, 10);
    } else {
     func();
    }
   } else { //w3c
    //w3c浏览器中只要创建文本节点插入到style元素中就行了
    var textnode = document.createtextnode(csstext);
    style.appendchild(textnode);
   }
   head.appendchild(style); //把创建的style元素插入到head中
  },
  indexof: function (array, item) {
   if (array.indexof) {
    return array.indexof(item);
   } else {
    var result = -1;
    for (var i = 0, len = array.length; i < len; i++) {
     if (array[i] === item) {
      result = i;
      break;
     }
    }
    return result;
   }
  }
 }
 
 function eventemitter() {
  this._events = {}
 }

 eventemitter.prototype.on = function (eventname, listener) {
  if (!eventname || !listener) return;
  if (!util.isvalidlistener(listener)) {
   throw new typeerror('listener must be a function');
  }
  var events = this._events;
  var listeners = events[eventname] = events[eventname] || [];
  var listeneriswrapped = typeof listener === 'object';
  // 不重复添加事件
  if (util.indexof(listeners, listener) === -1) {
   listeners.push(listeneriswrapped ? listener : {
    listener: listener,
    once: false
   });
  }
  return this;
 };
 eventemitter.prototype.once = function (eventname, listener) {
  return this.on(eventname, {
   listener: listener,
   once: true
  })
 };
 eventemitter.prototype.off = function (eventname, listener) {
  var listeners = this._events[eventname];
  if (!listeners) return;
  var index;
  for (var i = 0, len = listeners.length; i < len; i++) {
   if (listeners[i] && listeners[i].listener === listener) {
    index = i;
    break;
   }
  }
  if (typeof index !== 'undefined') {
   listeners.splice(index, 1, null)
  }
  return this;
 };
 eventemitter.prototype.emit = function (eventname, args) {
  var listeners = this._events[eventname];
  if (!listeners) return;
  for (var i = 0; i < listeners.length; i++) {
   var listener = listeners[i];
   if (listener) {
    listener.listener.apply(this, args || []);
    if (listener.once) {
     this.off(eventname, listener.listener)
    }
   }
  }
  return this;
 };
 
 // =================代码块2=========================================
 function slidertools(options) {
  this.options = util.extend({}, this.constructor.defaultoptions, options)
  this.init();
  this.bindevents();
  this.diffx = 0;
  this.flag = false;//是否拖动到最右侧
 }

 slidertools.defaultoptions = {
  el: document.body //默认放到body里
 };
 
 var proto = slidertools.prototype = new eventemitter();//slidertools继承emitter
 
 proto.constructor = slidertools;//修正构造器

 proto.init = function () {
  this.createslider();//创建插件所需要的dom元素
  this.getelements();//获取创建好的元素
 }
 
 // =================代码块3=========================================
 if (typeof exports != 'undefined' && !exports.nodetype) {
  if (typeof module != 'undefined' && !module.nodetype && module.exports) {
   exports = module.exports = slidertools;
  }
  exports.slidertools = slidertools;
 } else {
  root.slidertools = slidertools;
 }
}());

代码块1是在判断是在浏览器环境还是nodejs环境，方便代码三后期使用， 代码块2声明了一个对象 slidertools ,将用户传进来的 option 和默认的 defaultoption 进行合并

编写核心函数1(创建dom和css)

proto.createslider = function () {
 this.options.el.innerhtml = '<div id="slider"><div class="drag_bg"></div><div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div><div class="handler handler_bg"></div></div>';//像指定元素中放置插件的dom元素
 util.addcss('ul,li {list-style: none;} a {text-decoration: none;} .wrap {width: 300px;height: 350px;text-align: center;margin: 150px auto;}.inner {padding: 15px;} .clearfix {overflow: hidden;_zoom: 1;} .none {display: none;} #slider {position:relative;background-color: #e8e8e8;width: 300px;height: 34px;line-height: 34px;text-align: center;} #slider .handler {position: absolute;top: 0px;left: 0px;width: 40px;height: 32px;border: 1px solid #ccc;cursor: move;} .handler_bg {background: #fff url("data:image/png;base64,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") no-repeat center;} .handler_ok_bg {background: #fff url("data:image/png;base64,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") no-repeat center;}#slider .drag_bg {background-color: #7ac23c; height: 34px;width: 0px;} #slider .drag_text {position: absolute; top: 0px;width: 300px;-moz-user-select: none;-webkit-user-select: none;user-select: none;-o-user-select: none;-ms-user-select: none; }.unselect {-moz-user-select: none;-webkit-user-select: none; -ms-user-select: none;}.slide_ok {color: #fff;}')//像页面里add新的样式
}
proto.getelements = function () {
 this.slider = document.queryselector('#slider');
 this.drag_bg = document.queryselector('.drag_bg');
 this.handler = document.queryselector('.handler');
}

编写核心函数2(绑定事件)

proto.bindevents = function () {
 var self = this;
 self.handler.onmousedown = function (e) {
  self.diffx = e.clientx - self.handler.offsetleft;
  util.setclassname(self.slider, 'unselect'); //禁止选择样式
  document.onmousemove = function (e) {
   let deltax = e.clientx - self.diffx;
   if (deltax >= self.slider.offsetwidth - self.handler.offsetwidth) { //拖动到了最右侧
    deltax = self.slider.offsetwidth - self.handler.offsetwidth;
    self.flag = true;
   } else if (deltax <= 0) {
    deltax = 0;
    self.flag = false;
   } else {
    self.flag = false;
   }
   util.setinlinestyle([self.handler], 'left', deltax + 'px');
   util.setinlinestyle([self.drag_bg], 'width', deltax + 'px');
  }
  document.onmouseup = function (e) {
   util.setclassname(self.slider, '')
   if (self.flag) {
    util.setclassname(self.slider, 'slide_ok') //拖动完成后的样式
    util.addclass(self.handler, 'handler_ok_bg')////拖动完成后的样式
    self.handler.onmousedown = null //防止拖动完成后再次拖动
    self.emit('complete')//emit通知使用者的回调事件
   } else {
    util.setinlinestyle([self.handler], 'left', 0 + 'px');
    util.setinlinestyle([self.drag_bg], 'width', 0 + 'px');
   }
   document.onmousemove = null;
   document.onmouseup = null;
  }
 }
}

添加工具方法(核心函数2中用到的)

var util = {
 // ...初始框架里的那部分
 setclassname(selector, classname) {
  selector.classname = classname;
 },
 addclass(selector, classname) {
  selector.classlist.add(classname);
 },
 setinlinestyle(selector, attr, content) {
  let length = selector.length;
  for (let i = 0; i < length; i++) {
   selector[i].style[attr] = content;
  }
 },
}

最终完整可运行代码

(function () {
 var root = (typeof self == 'object' && self.self == self && self) ||
  (typeof global == 'object' && global.global == global && global) ||
  this || {};
 var util = {
  extend: function (target) {
   for (var i = 1, len = arguments.length; i < len; i++) {
    for (var prop in arguments[i]) {
     if (arguments[i].hasownproperty(prop)) {
      target[prop] = arguments[i][prop]
     }
    }
   }
   return target
  },
  setclassname(selector, classname) {
   selector.classname = classname;
  },
  addclass(selector, classname) {
   selector.classlist.add(classname);
  },
  setinlinestyle(selector, attr, content) {
   let length = selector.length;
   for (let i = 0; i < length; i++) {
    selector[i].style[attr] = content;
   }
  },
  isvalidlistener: function (listener) {
   if (typeof listener === 'function') {
    return true
   } else if (listener && typeof listener === 'object') {
    return util.isvalidlistener(listener.listener)
   } else {
    return false
   }
  },
  addcss: function (csstext) {
   var style = document.createelement('style'), //创建一个style元素
    head = document.head || document.getelementsbytagname('head')[0]; //获取head元素
   style.type = 'text/css'; //这里必须显示设置style元素的type属性为text/css，否则在ie中不起作用
   if (style.stylesheet) { //ie
    var func = function () {
     try { //防止ie中stylesheet数量超过限制而发生错误
      style.stylesheet.csstext = csstext;
     } catch (e) {

     }
    }
    //如果当前stylesheet还不能用，则放到异步中则行
    if (style.stylesheet.disabled) {
     settimeout(func, 10);
    } else {
     func();
    }
   } else { //w3c
    //w3c浏览器中只要创建文本节点插入到style元素中就行了
    var textnode = document.createtextnode(csstext);
    style.appendchild(textnode);
   }
   head.appendchild(style); //把创建的style元素插入到head中
  },
  indexof: function (array, item) {
   if (array.indexof) {
    return array.indexof(item);
   } else {
    var result = -1;
    for (var i = 0, len = array.length; i < len; i++) {
     if (array[i] === item) {
      result = i;
      break;
     }
    }
    return result;
   }
  }
 }

 function eventemitter() {
  this._events = {}
 }

 eventemitter.prototype.on = function (eventname, listener) {
  if (!eventname || !listener) return;

  if (!util.isvalidlistener(listener)) {
   throw new typeerror('listener must be a function');
  }

  var events = this._events;
  var listeners = events[eventname] = events[eventname] || [];
  var listeneriswrapped = typeof listener === 'object';

  // 不重复添加事件
  if (util.indexof(listeners, listener) === -1) {
   listeners.push(listeneriswrapped ? listener : {
    listener: listener,
    once: false
   });
  }

  return this;
 };
 eventemitter.prototype.once = function (eventname, listener) {
  return this.on(eventname, {
   listener: listener,
   once: true
  })
 };
 eventemitter.prototype.off = function (eventname, listener) {
  var listeners = this._events[eventname];
  if (!listeners) return;

  var index;
  for (var i = 0, len = listeners.length; i < len; i++) {
   if (listeners[i] && listeners[i].listener === listener) {
    index = i;
    break;
   }
  }

  if (typeof index !== 'undefined') {
   listeners.splice(index, 1, null)
  }

  return this;
 };
 eventemitter.prototype.emit = function (eventname, args) {
  var listeners = this._events[eventname];
  if (!listeners) return;

  for (var i = 0; i < listeners.length; i++) {
   var listener = listeners[i];
   if (listener) {
    listener.listener.apply(this, args || []);
    if (listener.once) {
     this.off(eventname, listener.listener)
    }
   }
  }
  return this;
 };

 function slidertools(options) {
  this.options = util.extend({}, this.constructor.defaultoptions, options)
  this.init();
  this.bindevents();
  this.diffx = 0;
  this.flag = false;
 }

 slidertools.version = '1.0.0';

 slidertools.defaultoptions = {
  el: document.body
 };

 var proto = slidertools.prototype = new eventemitter();

 proto.constructor = slidertools;

 proto.init = function () {
  this.createslider();
  this.getelements();
 }

 proto.createslider = function () {
  this.options.el.innerhtml = '<div id="slider"><div class="drag_bg"></div><div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div><div class="handler handler_bg"></div></div>';
  util.addcss('ul, li { list-style: none; } a { text-decoration: none; } .wrap { width: 300px; height: 350px; text-align: center; margin: 150px auto; } .inner { padding: 15px; } .clearfix { overflow: hidden; _zoom: 1; } .none { display: none; } #slider { position: relative; background-color: #e8e8e8; width: 300px; height: 34px; line-height: 34px; text-align: center; } #slider .handler { position: absolute; top: 0px; left: 0px; width: 40px; height: 32px; border: 1px solid #ccc; cursor: move;} .handler_bg { background: #fff url("data:image/png;base64,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") no-repeat center; } .handler_ok_bg { background: #fff url("data:image/png;base64,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") no-repeat center; } #slider .drag_bg { background-color: #7ac23c; height: 34px; width: 0px;  } #slider .drag_text { position: absolute; top: 0px; width: 300px; -moz-user-select: none; -webkit-user-select: none; user-select: none; -o-user-select: none; -ms-user-select: none; } .unselect { -moz-user-select: none; -webkit-user-select: none; -ms-user-select: none; } .slide_ok { color: #fff; }')
 }
 proto.getelements = function () {
  this.slider = document.queryselector('#slider');
  this.drag_bg = document.queryselector('.drag_bg');
  this.handler = document.queryselector('.handler');
 }
 proto.bindevents = function () {
  var self = this;
  self.handler.onmousedown = function (e) {
   self.diffx = e.clientx - self.handler.offsetleft;
   util.setclassname(self.slider, 'unselect');
   document.onmousemove = function (e) {
    let deltax = e.clientx - self.diffx;
    if (deltax >= self.slider.offsetwidth - self.handler.offsetwidth) {
     deltax = self.slider.offsetwidth - self.handler.offsetwidth;
     self.flag = true;
    } else if (deltax <= 0) {
     deltax = 0;
     self.flag = false;
    } else {
     self.flag = false;
    }
    util.setinlinestyle([self.handler], 'left', deltax + 'px');
    util.setinlinestyle([self.drag_bg], 'width', deltax + 'px');
   }
   document.onmouseup = function (e) {
    util.setclassname(self.slider, '')
    if (self.flag) {
     util.setclassname(self.slider, 'slide_ok')
     util.addclass(self.handler, 'handler_ok_bg')
     self.handler.onmousedown = null
     self.emit('complete')
    } else {
     util.setinlinestyle([self.handler], 'left', 0 + 'px');
     util.setinlinestyle([self.drag_bg], 'width', 0 + 'px');
    }
    document.onmousemove = null;
    document.onmouseup = null;
   }
  }
 }
 if (typeof exports != 'undefined' && !exports.nodetype) {
  if (typeof module != 'undefined' && !module.nodetype && module.exports) {
   exports = module.exports = slidertools;
  }
  exports.slidertools = slidertools;
 } else {
  root.slidertools = slidertools;
 }
}());

let slider = new slidertools();
slider.on('complete',() => {
 alert('验证完成');
})

结语

参考资料

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