html图片上传自动清空,基于JQuery实现图片上传预览与删除操作

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

上传图片预览

$(function(){

var p = new ImgPreview();

p.preview({previewid:"imgupload1"});

p.preview({previewid:"imgupload2"});

});

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 = "" +

"

" +

"

" +

"" +

"上传图片" +

"" +

"" +

"

" +

"

" +

"" +

"删除图片" +

"" +

"" +

"

" +

"

" +

"

$("#" + options.previewid).html(htm);

$("#" + fileid).bind("click",function(){

var $this =$(this);

var browser={

isIE:function(ver){

var b = document.createElement('b');

b.innerHTML = '';

return b.getElementsByTagName('i').length === 1;

}

};

$this.change(function(){

var regex=/(.*)\.(jpg|jpeg|png)$/;

var val = $this.val();

if(!regex.test(val)){

$("#" + viewid).html("请选择正确的图片(jpg、jpeg、png)!");

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("该浏览器不支持预览图片!");

}

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("");

$("#" + xdelid).show();

};

var aFiles = $this.get(0).files;

if (aFiles.length == 0) { return; }

if (!rFilter.test(aFiles[0].type)) {

$("#" + viewid).html("请选择正确的图片(jpg、jpeg、png)!");

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("");

$("#" + 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 = '';

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

更多精彩内容，请点击《jQuery上传操作汇总》，进行深入学习和研究。

以上就是本文的全部内容，希望对大家学习jquery程序设计有所帮助。