基于JQuery实现图片上传预览与删除操作

2019-11-20 09:55:54

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本文实例为大家分享了JQuery实现图片上传预览与删除的具体代码，经测试目前满足谷歌、火狐、360、IE6,7,8,9,10,11等浏览器，供大家参考，具体内容如下

1. preview.2.0.html

<!DOCTYPE html><html><head> <title>上传图片预览</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="srdz.preview.2.0.css"> <script type="text/javascript" src="jquery.min.js"></script> <script type="text/javascript" src="srdz.preview.2.0.js"></script><script type="text/javascript"> $(function(){  var p = new ImgPreview();  p.preview({previewid:"imgupload1"});   p.preview({previewid:"imgupload2"});  });</script></head><body> <div align="center" style="width: 50%;padding: 50px 300px;" id="imgupload1"></div> <div align="center" style="width: 50%;padding: 50px 300px;" id="imgupload2"></div></body></html>

2. srdz.preview.2.0.css

.btn-pic { display: block; position: relative; width: 120px; height: 40px; overflow: hidden; cursor: pointer; text-align: center;} .btn-pic-bg { border: 1px solid #ff9000; background: none repeat scroll 0 0 #ff9000; color: #ffffff; text-decoration: none;} .btn-pic span { display: block; line-height: 39px;} .ipt-bg { display: block; position: absolute; top: 0; left: 0; width: 120px; height: 40px; font-size: 100px; opacity: 0; filter: alpha(opacity=0);} .spanc{ color: red;} .drt { float: right; display: none;} .dft { float: left;}

3. srdz.preview.2.0.js

function ImgPreview(){} ImgPreview.prototype.preview=function(options){   var time = new Date().getTime(); var fileid = "file" + time; var xdelid = "xdel" + time; var delid = "del" + time;  var viewid = "view" + time;   var htm = "" + "<div>" +  "<div class='dft'>" +   "<a class='btn-pic btn-pic-bg' href='javascript:void(0);'>" +    "<span>上传图片</span>" +    "<input id='" + fileid + "' type='file' name='file' class='ipt-bg' />" +   "</a>" +  "</div>" +  "<div id='" + xdelid + "' class='drt'>" +   "<a class='btn-pic btn-pic-bg' href='javascript:void(0)'>" +    "<span>删除图片</span>" +    "<input type='button' id='" + delid + "' class='ipt-bg'/>" +   "</a>" +  "</div>" + "</div>" + "<div id='" + viewid + "'></div>";   $("#" + options.previewid).html(htm);   $("#" + fileid).bind("click",function(){     var $this =$(this);     var browser={   isIE:function(ver){    var b = document.createElement('b');    b.innerHTML = '<!--[if IE ' + ver + ']><i></i><![endif]-->';    return b.getElementsByTagName('i').length === 1;   }  };     $this.change(function(){   var regex=/(.*)/.(jpg|jpeg|png)$/;   var val = $this.val();   if(!regex.test(val)){    $("#" + viewid).html("<span class='spanc'>请选择正确的图片（jpg、jpeg、png）!</span>");    return;   }       if(browser.isIE(6)){    HanderOther($this);   }else if(browser.isIE(7) || browser.isIE(8) || browser.isIE(9)){    HanderIE789($this);   }else if(window.FileReader){    HanderFileReader($this);   }else{    $("#" + viewid).html("<span class='spanc'>该浏览器不支持预览图片!</span>");   }       function HanderFileReader($this){    var oFReader = new window.FileReader(),    rFilter = /^(?:image//bmp|image//cis/-cod|image//gif|image//ief|image//jpeg|image//jpeg|image//jpeg|image//pipeg|image//png|image//svg/+xml|image//tiff|image//x/-cmu/-raster|image//x/-cmx|image//x/-icon|image//x/-portable/-anymap|image//x/-portable/-bitmap|image//x/-portable/-graymap|image//x/-portable/-pixmap|image//x/-rgb|image//x/-xbitmap|image//x/-xpixmap|image//x/-xwindowdump)$/i;    oFReader.onload = function (oFREvent){     $("#" + viewid).html("<img src='"+oFREvent.target.result+"' style='width:100%;height:100%;'/>");     $("#" + xdelid).show();    };      var aFiles = $this.get(0).files;    if (aFiles.length == 0) { return; }    if (!rFilter.test(aFiles[0].type)) {      $("#" + viewid).html("<span class='spanc'>请选择正确的图片（jpg、jpeg、png）!</span>");      return;     }    oFReader.readAsDataURL(aFiles[0]);   }     function HanderIE789($this){    if(options.width != null && parseInt(options.width) > 0){     $("#" + viewid).css("width",options.width + "px");    }else{     $("#" + viewid).css("width","378px");    }    if(options.height != null && parseInt(options.height) > 0){     $("#" + viewid).css("height",options.height + "px");    }else{     $("#" + viewid).css("height","358px");    }    $("#" + viewid).css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src='"+GetImgSrc($this)+"')");    $("#" + xdelid).show();   }     function HanderOther($this){    $("#" + viewid).html("<img src='"+$this.val()+"' style='width:100%;height:100%;'/>");    $("#" + xdelid).show();   }     function GetImgSrc($this){    $this.select();    $this.blur();    var imgSrc =document.selection.createRange().text;    document.selection.empty();    return imgSrc;   }          }); });//绑定按钮事件   $("#" + delid).bind("click",function(){  var browser={    isIE:function(ver){     var b = document.createElement('b');     b.innerHTML = '<!--[if IE ' + ver + ']><i></i><![endif]-->';     return b.getElementsByTagName('i').length === 1;    }   };     if(browser.isIE(7) || browser.isIE(8) || browser.isIE(9)){   $("#" + fileid).val('');   $("#" + viewid).css("filter","");   $("#" + viewid).css("width","");   $("#" + viewid).css("height","");   $("#" + xdelid).hide();  }else{   $("#" + fileid).val('');   $("#" + viewid).empty();   $("#" + xdelid).hide();  } });};

4. jquery.min.js

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