JQuery+CSS实现图片上放置按钮的方法

2019-11-20 12:23:16

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来源：转载

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本文实例讲述了JQuery+CSS实现图片上放置按钮的方法。分享给大家供大家参考。具体分析如下：

position:relative日常应用的时候一般是设置给position:absolute;的父层的,
父层position:relative; 子层position:absolute;的话, 就是依照父层的边界进行定位的,
不然position:absolute 会逐层向上寻找设置了position:relative的元素边界, 直到body元素..

第一种写法（连同CSS一起追加进去）

var freeOne=""; freeOne=$(".freePreviewOne").attr("data-url"); if(freeOne==null){  //没有免费视频 }else{  $("#coursePicture").append("<a class='hide-650 fade5' "+   "style='top:94px;left:150px;position:absolute;z-index:100; " +   " width: 180px;height: 60px;border: 2px solid white;" +   "display: block;color: white;text-decoration: none;" +   "letter-spacing: 1px;font-size: 16px;line-height: 20px;" +   "text-align:center;padding-top:18px;" +   "background-color: rgba(0, 0, 0, 0.44);" +   "-webkit-backface-visibility: hidden;-webkit-transition: all .3s ease-in-out;" +   "-moz-transition: all .3s ease-in-out;-ms-transition: all .3s ease-in-out;" +   "-o-transition: all .3s ease-in-out;" +   "border-radius: 10px;'"+   "href='#modal' data-toggle='modal' "+   "data-url='"+freeOne+"'> "+   "<span class='contactus' style='font-size:26px;'>试 看</span> <span class='glyphicon glyphicon-play' style='font-size:20px;top:0;bottom:2px;'></span> </a>"  );}

页面：

<div class="es-row-wrap container-gap course-cover">  <div class="row row-5-7 course-cover-heading">  <div id="coursePicture" class="col-sm-5 picture hidden-xs" style="position: relative;">  <#if course.coverImage?has_content>   <img src="${course.coverImage}" class="img-responsive" width="436px" height="245px" />  <#else>   <img src="/resources/assets/img/default/course-large.png" class="img-responsive" /> </#if>  </div>  </div></div>

第二种写法：

//在课程图片上放置按钮 /* <a class="button hide-650 fade5" href="#modal" data-toggle="modal" data-url="/course/hyjgz2np/lesson/preview?lectureId=hyjgz2np0.49618492345325650.04212287697009742"> <span class="contactus"><strong>试看</strong></span> </a> */ //$("#coursePicture").append("<a class='btn btn-sm btn-info' href='#' style='top:120px;left:180px;position:absolute;z-index:100;'>试看</a>"); var freeOne=""; freeOne=$(".freePreviewOne").attr("data-url"); if(freeOne==null){  //没有免费视频 }else{  $("#coursePicture").append("<a class='freePreviewPicture hide-650 fade5' "+   "href='#modal' data-toggle='modal' "+   "data-url='"+freeOne+"'> "+   "<span class='contactus' style='font-size:26px;'>试 看</span> <span class='glyphicon glyphicon-play' style='font-size:20px;top:0;bottom:2px;'></span> </a>"   ); }

页面：

<style> .freePreviewPicture{  top:94px;  left:150px;  position:absolute;  z-index:100;  width: 180px;  height: 60px;  border: 2px solid white;  display: block;  color: white;text-decoration: none;  letter-spacing: 1px;font-size: 16px;  line-height: 20px;  text-align:center;padding-top:18px;  background-color: rgba(0, 0, 0, 0.44);  -webkit-backface-visibility: hidden;  -webkit-transition: all .3s ease-in-out;  -moz-transition: all .3s ease-in-out;  -ms-transition: all .3s ease-in-out;  -o-transition: all .3s ease-in-out;  border-radius: 10px; } </style> <div class="es-row-wrap container-gap course-cover">  <div class="row row-5-7 course-cover-heading">  <div id="coursePicture" class="col-sm-5 picture hidden-xs" style="position: relative;">  <#if course.coverImage?has_content>   <img src="${course.coverImage}" class="img-responsive" width="436px" height="245px" />  <#else>   <img src="/resources/assets/img/default/course-large.png" class="img-responsive" />  </#if>  </div>  </div> </div>

运行效果图如下：