这次给大家带来jquery做出图片上传预览与删除步骤详解，jquery做出图片上传预览与删除的注意事项有哪些，下面就是实战案例，一起来看一下。
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>
<p align="center" style="width: 50%;padding: 50px 300px;" id="imgupload1"></p>
<p align="center" style="width: 50%;padding: 50px 300px;" id="imgupload2"></p>
</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 = +
<p> +
<p 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> +
</p> +
<p 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> +
</p> +
</p> +
<p id='" + viewid + "'></p>;
$(# + 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();
}
});
};
相信看了本文案例你已经掌握了方法，更多精彩请关注其它相关文章！
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以上就是jquery做出图片上传预览与删除步骤详解的详细内容。