js 可增加删除图片上传框js代码
js 可增加删除图片上传框js代码
本款程序可以检测用户上传图片类型，大小，在上传之前，同时也可以增加多文件上传，就是不定文件多少，仿51空间那种文件上代码
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>图片预览效果</title>
<script src="CJL.0.1.min.js"></script>
<script src="QuickUpload.js"></script>
<script >
var ImagePreview = function(file, img, options) {
this.file = $$(file);//文件对象
this.img = $$(img);//预览图片对象
this._preload = null;//预载图片对象
this._data = "";//图像数据
this._upload = null;//remote模式使用的上传文件对象
var opt = this._setOptions(options);
this.action = opt.action;
this.timeout = opt.timeout;
this.ratio = opt.ratio;
this.maxWidth = opt.maxWidth;
this.maxHeight = opt.maxHeight;
this.onCheck = opt.onCheck;
this.onShow = opt.onShow;
this.onErr = opt.onErr;
//设置数据获取程序
this._getData = this._getDataFun(opt.mode);
//设置预览显示程序
this._show = opt.mode !== "filter" ? this._simpleShow : this._filterShow;
};
//根据浏览器获取模式
ImagePreview.MODE = $$B.ie7 || $$B.ie8 ? "filter" :
$$B.firefox ? "domfile" :
$$B.opera || $$B.chrome || $$B.safari ? "remote" : "simple";
//透明图片
ImagePreview.TRANSPARENT = $$B.ie7 || $$B.ie6 ?
"mhtml:" document.scripts[document.scripts.length - 1].getAttribute("src", 4) "!blankImage" :
"data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==";
ImagePreview.prototype = {
//设置默认属性
_setOptions: function(options) {
this.options = {//默认值
mode: ImagePreview.MODE,//预览模式
ratio: 0,//自定义比例
maxWidth: 0,//缩略图宽度
maxHeight: 0,//缩略图高度
onCheck: function(){},//预览检测时执行
onShow: function(){},//预览图片时执行
onErr: function(){},//预览错误时执行
//以下在remote模式时有效
action: undefined,//设置action
timeout: 0//设置超时(0为不设置)
};
return $$.extend(this.options, options || {});
},
//开始预览
preview: function() {
if ( this.file && false !== this.onCheck() ) {
this._preview( this._getData() );
}
},
//根据mode返回数据获取程序
_getDataFun: function(mode) {
switch (mode) {
case "filter" :
return this._filterData;
case "domfile" :
return this._domfileData;
case "remote" :
return this._remoteData;
case "simple" :
default :
return this._simpleData;
}
},
//滤镜数据获取程序
_filterData: function() {
this.file.select();
try{
return document.selection.createRange().text;
} finally { document.selection.empty(); }
},
//domfile数据获取程序
_domfileData: function() {
return this.file.files[0].getAsDataURL();
},
//远程数据获取程序
_remoteData: function() {
this._setUpload();
this._upload && this._upload.upload();
},
//一般数据获取程序
_simpleData: function() {
return this.file.value;
},
//设置remote模式的上传文件对象
_setUpload: function() {
if ( !this._upload && this.action !== undefined && typeof QuickUpload === "function" ) {
var oThis = this;
this._upload = new QuickUpload(this.file, {
onReady: function(){
this.action = oThis.action; this.timeout = oThis.timeout;
var parameter = this.parameter;
parameter.ratio = oThis.ratio;
parameter.width = oThis.maxWidth;
parameter.height = oThis.maxHeight;
},
onFinish: function(iframe){
try{
oThis._preview( iframe.contentWindow.document.body.innerHTML );
}catch(e){ oThis._error("remote error"); }
},
onTimeout: function(){ oThis._error("timeout error"); }
});
}
},
//预览程序
_preview: function(data) {
//空值或相同的值不执行显示
if ( !!data && data !== this._data ) {
this._data = data; this._show();
}
},
//设置一般预载图片对象
_simplePreload: function() {
if ( !this._preload ) {
var preload = this._preload = new Image(), oThis = this;
preload.onload = function(){ oThis._imgShow( oThis._data, this.width, this.height ); };
preload.onerror = function(){ oThis._error(); };
}
},
//一般显示
_simpleShow: function() {
this._simplePreload();
this._preload.src = this._data;
},
//设置滤镜预载图片对象
_filterPreload: function() {
if ( !this._preload ) {
var preload = this._preload = document.createElement("div");
//隐藏并设置滤镜
$$D.setStyle( preload, {
width: "1px", height: "1px",
visibility: "hidden", position: "absolute", left: "-9999px", top: "-9999px",
filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='image')"
});
//插入body
var body = document.body; body.insertBefore( preload, body.childNodes[0] );
}
},
//滤镜显示
_filterShow: function() {
this._filterPreload();
var preload = this._preload,
data = this._data.replace(/[)'"%]/g, function(s){ return escape(escape(s)); });
try{
preload.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = data;
}catch(e){ this._error("filter error"); return; }
//设置滤镜并显示
this.img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src="" data "")";
this._imgShow( ImagePreview.TRANSPARENT, preload.offsetWidth, preload.offsetHeight );
},
//显示预览
_imgShow: function(src, width, height) {
var img = this.img, style = img.style,
ratio = Math.max( 0, this.ratio ) || Math.min( 1,
Math.max( 0, this.maxWidth ) / width || 1,
Math.max( 0, this.maxHeight ) / height || 1
);
//设置预览尺寸
style.width = Math.round( width * ratio ) "px";
style.height = Math.round( height * ratio ) "px";
//设置src
img.src = src;
this.onShow();
},
//销毁程序
dispose: function() {
//销毁上传文件对象
if ( this._upload ) {
this._upload.dispose(); this._upload = null;
}
//销毁预载图片对象
if ( this._preload ) {
var preload = this._preload, parent = preload.parentNode;
this._preload = preload.onload = preload.onerror = null;
parent && parent.removeChild(preload);
}
//销毁相关对象
this.file = this.img = null;
},
//出错
_error: function(err) {
this.onErr(err);
}
}
</script>
</head>
<body>
<style>
.perview {width:600px;background:#fff;font-size:12px; border-collahttp://www.cnblogs.com/images/cnblogs_com/cloudgamer/169629/o_addfile.jpg) center no-repeat;
}
#idPicFile input {
font-size:20px;cursor:pointer;
position:absolute;right:0;bottom:0;
filter:alpha(opacity=0);opacity:0;
outline:none;hide-focus:expression(this.hideFocus=true);
}
</style>
<table class="perview">
<tr>
<th align="right"> 选择图片： </th>
<td width="75%"> <div id="idPicFile"> </div> </td>
</tr>
<tr>
<td colspan="2"><table>
<thead>
<tr>
<th> 文件路径 </th>
<th width="30%"> 预览图 </th>
<th width="20%"> 操作 </th>
</tr>
</thead>
<tbody id="idPicList">
<tr>
<td></td>
<td align="center"></td>
<td align="center"><a href="#">移除</a></td>
</tr>
</tbody>
</table></td>
</tr>
</table>
<script>
var table = $$("idPicList"), model = table.removeChild(table.rows[0]);
function AddPreview(){
var file = document.createElement("input"),
img = document.createElement("img"),
ip = new ImagePreview( file, img, {
maxWidth: 150,
maxHeight: 100,
action: "ImagePreview.ashx",
onErr: function(){ alert("载入预览出错！"); ResetFile(file); },
onCheck: CheckPreview,
onShow: ShowPreview
});
file.type = "file"; file.name = "pic";
file.onchange = function(){ ip.preview(); };
$$("idPicFile").appendChild(file);
}
//检测程序
var exts = "jpg|gif|bmp", paths = "|";
function CheckPreview(){
var value = this.file.value, check = true;
if ( !value ) {
check = false; alert("请先选择文件！");
} else if ( !RegExp( ".(?:" exts ")$$", "i" ).test(value) ) {
check = false; alert("只能上传以下类型：" exts);
} else if ( paths.indexOf( "|" value "|" ) >= 0 ) {
check = false; alert("已经有相同文件！");
}
check || ResetFile(this.file);
return check;
}
//显示预览
function ShowPreview(){
var row = table.appendChild(model.cloneNode(true)),
file = this.file, value = file.value, oThis = this;
row.appendChild(file).style.display = "none";
row.cells[0].innerHTML = value;
row.cells[1].appendChild(this.img);
row.getElementsByTagName("a")[0].onclick = function(){
oThis.dispose(); table.removeChild(row);
paths = paths.replace(value, ""); return false;
};
paths = value "|";
AddPreview();
}
AddPreview();
function ResetFile(file){
file.value = "";//ff chrome safari
if ( file.value ) {
if ( $$B.ie ) {//ie
with(file.parentNode.insertBefore(document.createElement('form'), file)){
appendChild(file); reset(); removeNode(false);
}
} else {//opera
file.type = "text"; file.type = "file";
}
}
}
</script>
</body>
</html>
您可能感兴趣的文章：
js添加删除div的例子
js 禁止文本框输入空格的代码
c#.net 匿名函数进行EventHandler参数传递的问题
php 多图片上传的简单例子(图文)
php 删除记录同时删除图片文件的代码
aspx fckeditor上传时 提示没有权限 Type=Image 的解决方法
Js验证上传图片及扩展名的代码实例
php删除记录同时刷新当前页面的实现代码
php处理文章中图片的方法
js去掉空格的代码