JS实现横向跑马灯效果代码

Brigitte ·

更新时间:2024-09-20

· 945 次阅读

首先我们需要一个html代码的框架如下：


<div style="position: absolute; top: 0px; left: 168px; width: 100%; margin-left: auto; margin-right: auto; height: 47px; border: 0px solid red; overflow: hidden;">
    <ul id="syNoticeUlNew" style="margin: 0px;left:0; top:0;margin-bottom:0px;width:100%;height:47px;position:absolute;">
    </ul>
  </div>

我们的目的是实现ul中的内容进行横向的一点一点滚动。ul中的内容应该是动态的。于是应该发送ajax来进行内容的获取拼接。


$.ajax({
      type:"post",
      dataType:"json",
      url:"${contextPath}/indexPage/getSyNoticeInfo",
      success:function(result){
        var totalStr = "";
        if(result.length>0){
          for(var i=0 ; i<result.length;i++){
            str = "<li style=\"list-style: none;display:inline-block;float:left;height:47px;padding-right:50px;line-height:47px;\">"+
             "<a style=\"color:white;\" class=\"sstzNoticeStyle\">"+result[i].peopleName+"</a>"+
             "</li>";
            totalStr +=str;
          }
        }
        $("#syNoticeUlNew").empty();
        $('#syNoticeUlNew').html(totalStr);
        syRunHorseLight();
      }
    });

拼接li时候有个class为sstzNoticeStyle。其样式如下：


.sstzNoticeStyle{
  color:white; font-size:16px;text-decoration:none;
}
.sstzNoticeStyle:hover{
  color:white; font-size:16px;text-decoration:none;
}

ajax调用syRunHorseLight函数，函数如下：


function syRunHorseLight() {
    if (syTimer != null) {
      clearInterval(syTimer);
    }
    var oUl = document.getElementById("syNoticeUlNew");
    if(oUl != null){
      oUl.innerHTML += oUl.innerHTML;
      oUl.innerHTML += oUl.innerHTML;
      oUl.innerHTML += oUl.innerHTML;
      var lis = oUl.getElementsByTagName('li');
      var lisTotalWidth = 0;
      var resetWidth = 0;
      for (var i = 0; i < lis.length; i++) {
        lisTotalWidth += lis[i].offsetWidth;
      }
      for (var i = 1; i <= lis.length / 4; i++) {
        resetWidth += lis[i].offsetWidth;
      }
      oUl.style.width = lisTotalWidth + 'px';
      var left = 0;
      syTimer = setInterval(function() {
        left -= 1;
        if (left <= -resetWidth) {
          left = 0;
        }
        oUl.style.left = left + 'px';
      }, 20)
      $("#syNoticeUlNew").hover(function() {
        clearInterval(syTimer);
      }, function() {
        clearInterval(syTimer);
        syTimer = setInterval(function() {
          left -= 1;
          if (left <= -resetWidth) {
            left = 0;
          }
          oUl.style.left = left + 'px';
        }, 20);
      })
    }
  }

跑马灯效果就此实现。

js js实现跑马灯

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