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本文实例为大家分享了js HTML5多图片上传及预览实例,供大家参考,具体内容如下
主要运用
1、HTML5 files可以选择多文件,以及获取多文件信息
2、XMLHTTPRequest对象,发送HTTP传输请求
3、将每一个文件放在FormData,进行传输
4、利用readAsDataURL将图片内容直接变成url,放在img标签的src当中,生成可预览的图片
html+css+js代码
<!DOCTYPE html> <head> <meta http-equiv="Content-Type" content="text/html" charset="utf-8" /> <title>test html FileReader</title> <style type="text/css"> html,body,header,footer,div,ul,li,h1,h2,h3,h4,h5,h6,label,input,textarea,p,span,a{ padding: 0; margin: 0; } img { border: 0; } em,strong{ font-weight: normal; font-style: normal; } ul { list-style: none; } h1,h2,h3,h4,h5,h6 { font-weight: normal; font-size: 100%; } a,a:after{ text-decoration:none; } .photo_wrap{ clear:both; } .photo_wrap li{ margin:10px; width:150px; float:left; } .photo_box { height:150px; width:150px; overflow:hidden; position:relative; } .photo_box .img1{ height:150px; } .photo_box .img2{ width:150px; } .upload_result{ height:50px; } .btns{ position:relative; height:40px; width:100px; float:left; } .btn{ height:40px; line-height:40px; color:#FFF; display:block; border-radius:3px; text-align:center; background-color: #FF5581; /* Old browsers */ background-image: -moz-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FA7B9C), color-stop(100%,#FF5581)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top,#FA7B9C 0%, #FF5581 100%); /* IE10+ */ background-image: linear-gradient(to bottom,#FA7B9C 0%, #FF5581 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#FA7B9C', endColorstr='#FF5581',GradientType=0 ); /* IE6-8 */ box-shadow:0 1px 0 rgba(255, 255, 255, 0.3) inset, 0 1px 2px rgba(0, 0, 0, 0.3); } .btn_add_pic{ width:100px; position:absolute; top:0; left:0; } .btn_upload{ width:100px; margin:0 10px 10px; float:left; } .btn:hover, .btn_cur{ background-color: #FB99B1; /* Old browsers */ background-image: -moz-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FB99B1), color-stop(100%,##FF5581)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top,#FB99B1 0%, #FF5581 100%); /* IE10+ */ background-image: linear-gradient(to bottom,#FB99B1 0%, #FF5581 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#FB99B1', endColorstr='#FF5581',GradientType=0 ); /* IE6-8 */ } .file_input_wrap{ position:absolute; top:0; left:0; width:100px; height:40px; } .file_input_wrap label{ width:100%; height:100%; display:block; opacity:0; cursor:pointer; } .file_input_wrap input{ opacity:0; filter:alpha(opacity=0);/*ie8及以下*/ position:absolute; top:7px; right:173px; cursor:pointer; width:95px; } .photo_box .icon_pos{ height:20px; width:20px; display:block; position:absolute; right:0; bottom:0; } .photo_box .loading{ height:10px; display:block; position:absolute; left:0; bottom:0; background-image:url(loading.gif); } .sucess_icon{ background-image:url(icons_01.png); background-position:0 0; } .error_icon{ background-image:url(icons_01.png); background-position:-20px 0; } </style> </head> <body> <div class="btns"> <a class="btn btn_add_pic" id="J_add_pic" href="javascript:;">添加图片</a> <div class="file_input_wrap"> <input type="file" id="file" name="file" accept="image/*" multiple onChange="fileInfo(this)" /> <label id="J_add_area"></label> </div> </div> <a class="btn btn_upload" id="J_upload" href="javascript:;">开始上传</a> <div id="J_photo_wrap"> <ul class="photo_wrap"> </ul> </div> </body> <script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.7.2.min.js">php收到文件的代码(这里只获取文件名字、类型、大小,没有进行其它操作)
<"name" => $name, "type" => $type, "size" => $size, "status" => 1 ); $return = json_encode($return); echo $return; ?>
存在的问题
1、为了生成缩略图,readAsDataURL读取文件内容会占用内存,所以大图片会造成浏览器卡住或者奔溃
2、上传没有进行分段处理以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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