var QuickUpload = function(file, options) {
this.file = $$(file);
this._sending = false;//是否正在上传
this._timer = null;//定时器
this._iframe = null;//iframe对象
this._form = null;//form对象
this._inputs = {};//input对象
this._fFINISH = null;//完成执行函数
$$.extend(this, this._setOptions(options));
};
QuickUpload._counter = 1;
QuickUpload.prototype = {
//设置默认属性
_setOptions: function(options) {
this.options = {//默认值
action: "",//设置action
timeout: 0,//设置超时(秒为单位)
parameter: {},//参数对象
onReady: function(){},//上传准备时执行
onFinish: function(){},//上传完成时执行
onStop: function(){},//上传停止时执行
onTimeout: function(){}//上传超时时执行
};
return $$.extend(this.options, options || {});
},
//上传文件
upload: function() {
//停止上一次上传
this.stop();
//没有文件返回
if ( !this.file || !this.file.value ) return;
//可能在onReady中修改相关属性所以放前面
this.onReady();
//设置iframe,form和表单控件
this._setIframe();
this._setForm();
this._setInput();
//设置超时
if ( this.timeout > 0 ) {
this._timer = setTimeout( $$F.bind(this._timeout, this), this.timeout * 1000 );
}
//开始上传
this._form.submit();
this._sending = true;
},
//设置iframe
_setIframe: function() {
if ( !this._iframe ) {
//创建iframe
var iframename = "QUICKUPLOAD_" + QuickUpload._counter++,
iframe = document.createElement( $$B.ie ? "<iframe name=\"" + iframename + "\">" : "iframe");
iframe.name = iframename;
iframe.style.display = "none";
//记录完成程序方便移除
var finish = this._fFINISH = $$F.bind(this._finish, this);
//iframe加载完后执行完成程序
if ( $$B.ie ) {
iframe.attachEvent( "onload", finish );
} else {
iframe.onload = $$B.opera ? function(){ this.onload = finish; } : finish;
}
//插入body
var body = document.body; body.insertBefore( iframe, body.childNodes[0] );
this._iframe = iframe;
}
},
//设置form
_setForm: function() {
if ( !this._form ) {
var form = document.createElement('form'), file = this.file;
//设置属性
$$.extend(form, {
target: this._iframe.name, method: "post", encoding: "multipart/form-data"
});
//设置样式
$$D.setStyle(form, {
padding: 0, margin: 0, border: 0,
backgroundColor: "transparent", display: "inline"
});
//提交前去掉form
file.form && $$E.addEvent(file.form, "submit", $$F.bind(this.dispose, this));
//插入form
file.parentNode.insertBefore(form, file).appendChild(file);
this._form = form;
}
//action可能会修改
this._form.action = this.action;
},
//设置input
_setInput: function() {
var form = this._form, oldInputs = this._inputs, newInputs = {}, name;
//设置input
for ( name in this.parameter ) {
var input = form[name];
if ( !input ) {
//如果没有对应input新建一个
input = document.createElement("input");
input.name = name; input.type = "hidden";
form.appendChild(input);
}
input.value = this.parameter[name];
//记录当前input
newInputs[name] = input;
//删除已有记录
delete oldInputs[name];
}
//移除无用input
for ( name in oldInputs ) { form.removeChild( oldInputs[name] ); }
//保存当前input
this._inputs = newInputs;
},
//停止上传
stop: function() {
if ( this._sending ) {
this._sending = false;
clearTimeout(this._timer);
//重置iframe
if ( $$B.opera ) {//opera通过设置src会有问题
this._removeIframe();
} else {
this._iframe.src = "";
}
this.onStop();
}
},
//销毁程序
dispose: function() {
this._sending = false;
clearTimeout(this._timer);
//清除iframe
if ( $$B.firefox ) {
setTimeout($$F.bind(this._removeIframe, this), 0);
} else {
this._removeIframe();
}
//清除form
this._removeForm();
//清除dom关联
this._inputs = this._fFINISH = this.file = null;
},
//清除iframe
_removeIframe: function() {
if ( this._iframe ) {
var iframe = this._iframe;
$$B.ie ? iframe.detachEvent( "onload", this._fFINISH ) : ( iframe.onload = null );
document.body.removeChild(iframe); this._iframe = null;
}
},
//清除form
_removeForm: function() {
if ( this._form ) {
var form = this._form, parent = form.parentNode;
if ( parent ) {
parent.insertBefore(this.file, form); parent.removeChild(form);
}
this._form = this._inputs = null;
}
},
//超时函数
_timeout: function() {
if ( this._sending ) { this._sending = false; this.stop(); this.onTimeout(); }
},
//完成函数
_finish: function() {
if ( this._sending ) { this._sending = false; this.onFinish(this._iframe); }
}
}
完整实例下载
完整实例下载（asp版本）
相关应用：JavaScript 图片上传预览效果
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