发布于 2016-11-26 22:38:00 | 150 次阅读 | 评论: 0 | 来源: 网友投递
jQuery javascript框架
jQuery是一个兼容多浏览器的javascript框架，核心理念是write less,do more(写得更少,做得更多)。jQuery在2006年1月由美国人John Resig在纽约的barcamp发布，吸引了来自世界各地的众多JavaScript高手加入，由Dave Methvin率领团队进行开发。
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
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。