(function($) {
$.extend($.fn, {
fileUpload: function(opts) {
this.each(function() {
var $self = $(this);
var doms = {
"fileToUpload": $self.find(".fileToUpload"),
"thumb": $self.find(".thumb"),
"progress": $self.find(".upload-progress")
};
var funs = {
//选择文件，获取文件大小，也可以在这里获取文件格式，限制用户上传非要求格式的文件
"fileSelected": function() {
var files = (doms.fileToUpload)[0].files;
var count = files.length;
for (var index = 0; index < count; index++) {
var file = files[index];
var fileSize = 0;
if (file.size > 1024 * 1024)
fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
else
fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
}
funs.uploadFile();
},
//异步上传文件
uploadFile: function() {
var fd = new FormData();//创建表单数据对象
var files = (doms.fileToUpload)[0].files;
var count = files.length;
for (var index = 0; index < count; index++) {
var file = files[index];
fd.append(opts.file, file);//将文件添加到表单数据中
funs.previewImage(file);//上传前预览图片，也可以通过其他方法预览txt
}
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", funs.uploadProgress, false);//监听上传进度
xhr.addEventListener("load", funs.uploadComplete, false);
xhr.addEventListener("error", opts.uploadFailed, false);
xhr.open("POST", opts.url);
xhr.send(fd);
},
//文件预览
previewImage: function(file) {
var gallery = doms.thumb;
var img = document.createElement("img");
img.file = file;
doms.thumb.html(img);
// 使用FileReader方法显示图片内容
var reader = new FileReader();
reader.onload = (function(aImg) {
return function(e) {
aImg.src = e.target.result;
};
})(img);
reader.readAsDataURL(file);
},
uploadProgress: function(evt) {
if (evt.lengthComputable) {
var percentComplete = Math.round(evt.loaded * 100 / evt.total);
doms.progress.html(percentComplete.toString() + '%');
}
},
"uploadComplete": function(evt) {
alert(evt.target.responseText)
}
};
doms.fileToUpload.on("change", function() {
doms.progress.find("span").width("0");
funs.fileSelected();
});
});
}
});
})(Zepto);
