JavaScript realizes the left and right scrolling effect of pictures [can automatically scroll, has left and right buttons]-JS Tutorial-php.cn

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JavaScript realizes the left and right scrolling effect of pictures [can automatically scroll, has left and right buttons]

高洛峰

Jan 18, 2017 pm 01:48 PM

The example in this article describes the javascript implementation of the left and right scrolling effect of images. Share it with everyone for your reference, the details are as follows:

html code:

<!doctype html>
<html>
<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
  <meta name="renderer" content="webkit"/>
  <meta name="keywords" content=""/>
  <meta name="description" content=""/>
  <title>图片滚动</title>
  <style>
  *{margin:0;padding:0;}
  ul{list-style:none;}
  img{border:0;}
  .scroll{width:358px;height:63px;}
  .scroll_left{width:23px;height:63px;background:url(images/btn_left.jpg) no-repeat;float:left;}
  .scroll_right{width:23px;height:63px;background:url(images/btn_right.jpg) left no-repeat;float:left;}
  .pic{width:312px;height:73px;float:left;}
  .pic ul{display:block;}
  .pic li{float:left;display:inline;width:104px;text-align:center;}
  </style>
</head>
<body>
<p style="margin:100px auto;width:358px;">
  <p>
    <p id="LeftArr"></p>
    <p id="scrollPic">
    <ul>
      <li><a href="#" target="_blank" title=""><img src="images/pic01.png" width="100" height="63" alt="" /></a></li>
      <li><a href="#" target="_blank" title=""><img src="images/pic02.jpg" width="100" height="63" alt="" /></a></li>
      <li><a href="#" target="_blank" title=""><img src="images/pic03.jpg" width="100" height="63" alt="" /></a></li>
      <li><a href="#" target="_blank" title=""><img src="images/pic04.jpg" width="100" height="63" alt="" /></a></li>
      <li><a href="#" target="_blank" title=""><img src="images/pic05.jpg" width="100" height="63" alt="" /></a></li>
      <li><a href="#" target="_blank" title=""><img src="images/pic06.jpg" width="100" height="63" alt="" /></a></li>
    </ul>
    </p>
    <p id="RightArr"></p>
  </p>
</p>
</body>
</html>
<script src="scrollPic.js"></script>
<script>
window.onload = function(){
  scrollPic();
}
function scrollPic() {
  var scrollPic = new ScrollPic();
  scrollPic.scrollContId  = "scrollPic"; //内容容器ID
  scrollPic.arrLeftId   = "LeftArr";//左箭头ID
  scrollPic.arrRightId   = "RightArr"; //右箭头ID
  scrollPic.frameWidth   = 312;//显示框宽度
  scrollPic.pageWidth   = 104; //翻页宽度
  scrollPic.speed     = 10; //移动速度(单位毫秒，越小越快)
  scrollPic.space     = 10; //每次移动像素(单位px，越大越快)
  scrollPic.autoPlay    = true; //自动播放
  scrollPic.autoPlayTime  = 3; //自动播放间隔时间(秒)
  scrollPic.initialize(); //初始化
}
</script>

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scrollPic.js code:

var sina = {
  $ : function (objName) {
    if (document.getElementById) {
      return eval(&#39;document.getElementById("&#39; + objName + &#39;")&#39;)
    } else {
      return eval(&#39;document.all.&#39; + objName)
    }
  },
  isIE : navigator.appVersion.indexOf("MSIE") != -1 ? true : false,
  addEvent : function (l, i, I) {
    if (l.attachEvent) {
      l.attachEvent("on" + i, I)
    } else {
      l.addEventListener(i, I, false)
    }
  },
  delEvent : function (l, i, I) {
    if (l.detachEvent) {
      l.detachEvent("on" + i, I)
    } else {
      l.removeEventListener(i, I, false)
    }
  },
  readCookie : function (O) {
    var o = "",
    l = O + "=";
    if (document.cookie.length > 0) {
      var i = document.cookie.indexOf(l);
      if (i != -1) {
        i += l.length;
        var I = document.cookie.indexOf(";", i);
        if (I == -1)
          I = document.cookie.length;
        o = unescape(document.cookie.substring(i, I))
      }
    };
    return o
  },
  writeCookie : function (i, l, o, c) {
    var O = "",
    I = "";
    if (o != null) {
      O = new Date((new Date).getTime() + o * 3600000);
      O = "; expires=" + O.toGMTString()
    };
    if (c != null) {
      I = ";domain=" + c
    };
    document.cookie = i + "=" + escape(l) + O + I
  },
  readStyle : function (I, l) {
    if (I.style[l]) {
      return I.style[l]
    } else if (I.currentStyle) {
      return I.currentStyle[l]
    } else if (document.defaultView && document.defaultView.getComputedStyle) {
      var i = document.defaultView.getComputedStyle(I, null);
      return i.getPropertyValue(l)
    } else {
      return null
    }
  }
};
//滚动图片构造函数
//UI&UE Dept. mengjia
//080623
function ScrollPic(scrollContId, arrLeftId, arrRightId, dotListId) {
  this.scrollContId = scrollContId;
  this.arrLeftId = arrLeftId;
  this.arrRightId = arrRightId;
  this.dotListId = dotListId;
  this.dotClassName = "dotItem";
  this.dotOnClassName = "dotItemOn";
  this.dotObjArr = [];
  this.pageWidth = 0;
  this.frameWidth = 0;
  this.speed = 10;
  this.space = 10;
  this.pageIndex = 0;
  this.autoPlay = true;
  this.autoPlayTime = 5;
  var _autoTimeObj,
  _scrollTimeObj,
  _state = "ready";
  this.stripDiv = document.createElement("DIV");
  this.listDiv01 = document.createElement("DIV");
  this.listDiv02 = document.createElement("DIV");
  if (!ScrollPic.childs) {
    ScrollPic.childs = []
  };
  this.ID = ScrollPic.childs.length;
  ScrollPic.childs.push(this);
  this.initialize = function () {
    if (!this.scrollContId) {
      throw new Error("必须指定scrollContId.");
      return
    };
    this.scrollContDiv = sina.$(this.scrollContId);
    if (!this.scrollContDiv) {
      throw new Error("scrollContId不是正确的对象.(scrollContId = \"" + this.scrollContId + "\")");
      return
    };
    this.scrollContDiv.style.width = this.frameWidth + "px";
    this.scrollContDiv.style.overflow = "hidden";
    this.listDiv01.innerHTML = this.listDiv02.innerHTML = this.scrollContDiv.innerHTML;
    this.scrollContDiv.innerHTML = "";
    this.scrollContDiv.appendChild(this.stripDiv);
    this.stripDiv.appendChild(this.listDiv01);
    this.stripDiv.appendChild(this.listDiv02);
    this.stripDiv.style.overflow = "hidden";
    this.stripDiv.style.zoom = "1";
    this.stripDiv.style.width = "32766px";
    if(-[1,]){
      this.listDiv01.style.cssFloat = "left";
      this.listDiv02.style.cssFloat = "left";
    }else{
      this.listDiv01.style.styleFloat = "left";
      this.listDiv02.style.styleFloat = "left";
    }
    sina.addEvent(this.scrollContDiv, "mouseover", Function("ScrollPic.childs[" + this.ID + "].stop()"));
    sina.addEvent(this.scrollContDiv, "mouseout", Function("ScrollPic.childs[" + this.ID + "].play()"));
    if (this.arrLeftId) {
      this.arrLeftObj = sina.$(this.arrLeftId);
      if (this.arrLeftObj) {
        sina.addEvent(this.arrLeftObj, "mousedown", Function("ScrollPic.childs[" + this.ID + "].rightMouseDown()"));
        sina.addEvent(this.arrLeftObj, "mouseup", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"));
        sina.addEvent(this.arrLeftObj, "mouseout", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"))
      }
    };
    if (this.arrRightId) {
      this.arrRightObj = sina.$(this.arrRightId);
      if (this.arrRightObj) {
        sina.addEvent(this.arrRightObj, "mousedown", Function("ScrollPic.childs[" + this.ID + "].leftMouseDown()"));
        sina.addEvent(this.arrRightObj, "mouseup", Function("ScrollPic.childs[" + this.ID + "].leftEnd()"));
        sina.addEvent(this.arrRightObj, "mouseout", Function("ScrollPic.childs[" + this.ID + "].leftEnd()"))
      }
    };
    if (this.dotListId) {
      this.dotListObj = sina.$(this.dotListId);
      if (this.dotListObj) {
        var pages = Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4),
        i,
        tempObj;
        for (i = 0; i < pages; i++) {
          tempObj = document.createElement("span");
          this.dotListObj.appendChild(tempObj);
          this.dotObjArr.push(tempObj);
          if (i == this.pageIndex) {
            tempObj.className = this.dotClassName
          } else {
            tempObj.className = this.dotOnClassName
          };
          tempObj.title = "第" + (i + 1) + "页";
          sina.addEvent(tempObj, "click", Function("ScrollPic.childs[" + this.ID + "].pageTo(" + i + ")"))
        }
      }
    };
    if (this.autoPlay) {
      this.play()
    }
  };
  this.leftMouseDown = function () {
    if (_state != "ready") {
      return
    };
    _state = "floating";
    _scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].moveLeft()", this.speed)
  };
  this.rightMouseDown = function () {
    if (_state != "ready") {
      return
    };
    _state = "floating";
    _scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].moveRight()", this.speed)
  };
  this.moveLeft = function () {
    if (this.scrollContDiv.scrollLeft + this.space >= this.listDiv01.scrollWidth) {
      this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + this.space - this.listDiv01.scrollWidth
    } else {
      this.scrollContDiv.scrollLeft += this.space
    };
    this.accountPageIndex()
  };
  this.moveRight = function () {
    if (this.scrollContDiv.scrollLeft - this.space <= 0) {
      this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - this.space
    } else {
      this.scrollContDiv.scrollLeft -= this.space
    };
    this.accountPageIndex()
  };
  this.leftEnd = function () {
    if (_state != "floating") {
      return
    };
    _state = "stoping";
    clearInterval(_scrollTimeObj);
    var fill = this.pageWidth - this.scrollContDiv.scrollLeft % this.pageWidth;
    this.move(fill)
  };
  this.rightEnd = function () {
    if (_state != "floating") {
      return
    };
    _state = "stoping";
    clearInterval(_scrollTimeObj);
    var fill = -this.scrollContDiv.scrollLeft % this.pageWidth;
    this.move(fill)
  };
  this.move = function (num, quick) {
    var thisMove = num / 5;
    if (!quick) {
      if (thisMove > this.space) {
        thisMove = this.space
      };
      if (thisMove < -this.space) {
        thisMove = -this.space
      }
    };
    if (Math.abs(thisMove) < 1 && thisMove != 0) {
      thisMove = thisMove >= 0 ? 1 : -1
    } else {
      thisMove = Math.round(thisMove)
    };
    var temp = this.scrollContDiv.scrollLeft + thisMove;
    if (thisMove > 0) {
      if (this.scrollContDiv.scrollLeft + thisMove >= this.listDiv01.scrollWidth) {
        this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + thisMove - this.listDiv01.scrollWidth
      } else {
        this.scrollContDiv.scrollLeft += thisMove
      }
    } else {
      if (this.scrollContDiv.scrollLeft - thisMove <= 0) {
        this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - thisMove
      } else {
        this.scrollContDiv.scrollLeft += thisMove
      }
    };
    num -= thisMove;
    if (Math.abs(num) == 0) {
      _state = "ready";
      if (this.autoPlay) {
        this.play()
      };
      this.accountPageIndex();
      return
    } else {
      this.accountPageIndex();
      setTimeout("ScrollPic.childs[" + this.ID + "].move(" + num + "," + quick + ")", this.speed)
    }
  };
  this.next = function () {
    if (_state != "ready") {
      return
    };
    _state = "stoping";
    this.move(this.pageWidth, true)
  };
  this.play = function () {
    if (!this.autoPlay) {
      return
    };
    clearInterval(_autoTimeObj);
    _autoTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].next()", this.autoPlayTime * 1000)
  };
  this.stop = function () {
    clearInterval(_autoTimeObj)
  };
  this.pageTo = function (num) {
    if (_state != "ready") {
      return
    };
    _state = "stoping";
    var fill = num * this.frameWidth - this.scrollContDiv.scrollLeft;
    this.move(fill, true)
  };
  this.accountPageIndex = function () {
    this.pageIndex = Math.round(this.scrollContDiv.scrollLeft / this.frameWidth);
    if (this.pageIndex > Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4) - 1) {
      this.pageIndex = 0
    };
    var i;
    for (i = 0; i < this.dotObjArr.length; i++) {
      if (i == this.pageIndex) {
        this.dotObjArr[i].className = this.dotClassName
      } else {
        this.dotObjArr[i].className = this.dotOnClassName
      }
    }
  }
};

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Parameter description:

var scrollPic = new ScrollPic(); //Define variables and initialize methods
scrollContId //Scroll container ID
arrLeftId //Left button ID
arrRightId //Right button ID
frameWidth //Display frame width
pageWidth //Page turning width
speed //Moving speed (unit milliseconds, the smaller the faster)
space //Move pixels each time (unit px, the larger the faster)
autoPlay / /Autoplay
autoPlayTime //Autoplay interval (seconds)
initialize() //Initialization

I hope this article will be helpful to everyone in JavaScript programming.

For more javascript to achieve the left and right scrolling effect of images [can automatically scroll, with left and right buttons] please pay attention to the PHP Chinese website for related articles!

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