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How to implement file upload with Ajax and form+iframe (detailed explanation with pictures and text)
How to implement file upload with Ajax and form+iframe (detailed explanation with pictures and text)
This time I will bring you the method of file upload with Ajax and form+iframe (detailed explanation with pictures and texts). What are the precautions for Ajax and form+iframe to implement file upload? , the following is a practical case, let’s take a look.
Since the advent of html5, file uploading has become very simple. It is very convenient to solve the file upload function that needs to be used in the project. HTML5 supports multiple image uploads, ajax uploads, previews of images before uploading, and drag-and-drop image uploading. It is purely implemented using the file control and has very little JS code. It is hard not to praise it!HTML5Ajax upload
The upload implementation of html5 requires file control and XMLHttpRequest request. The following is an upload plug-in I encapsulated:function fileUpload(options) {
var opts = options || {};
var func = function() {};
this.fileInput = opts.fileInput || null;
this.url = opts.url || '';
this.fileList = [];
this.onFilter = opts.onFilter || function(f) {return f;}; //选择文件组的过滤方法
this.onSelect = opts.onSelect || func; //文件选择后
this.onProgress = opts.onProgress || func; //文件上传进度
this.onSuccess = opts.onSuccess || func; //文件上传成功时
this.onFailure = opts.onFailure || func; //文件上传失败时;
this.onComplete = opts.onComplete || func; //文件全部上传完毕时
this.init();
}
fileUpload.prototype = {
dealFiles: function(e) { //获取要上传的文件数组（用户选择文件后执行）
var files = e.target.files || e.dataTransfer.files;
this.fileList = this.onFilter(files);
for(var i = 0, file; file = this.fileList[i]; i++){ //增加唯一索引值
file.index = i;
}
this.onSelect(this.fileList);
return this;
},
removeFile: function(fileDelete) { //删除某一个文件
var arrFile = [];
for(var i = 0, file; file = this.fileList[i]; i++){
if (file != fileDelete) {
arrFile.push(file);
}
}
this.fileList = arrFile;
return this;
},
removeAll: function() { //清空文件队列
this.fileList = [];
return this;
},
uploadFile: function() { //上传文件
var me = this;
for(var i = 0, file; file = this.fileList[i]; i++){
(function(file) {
var formData = new FormData();
var xhr = new XMLHttpRequest();
if (xhr.upload) {
xhr.upload.addEventListener("progress", function(e) { // 上传中
me.onProgress(file, e.loaded, e.total);
}, false);
xhr.onreadystatechange = function(e) { // 文件上传成功或是失败
if (xhr.readyState == 4) {
if (xhr.status == 200) {
me.onSuccess(file, xhr.responseText);
me.removeFile(file);
if (!me.fileList.length) {
me.onComplete(); //上传全部完毕。执行回调
}
} else {
me.onFailure(file, xhr.responseText);
}
}
};
// 开始上传
formData.append('file', file);
xhr.open("POST", me.url, true);
xhr.send(formData);
}
})(file);
}
},
init: function() {
var me = this;
//文件选择控件选择
if (me.fileInput) {
me.fileInput.addEventListener("change", function(e) { me.dealFiles(e); }, false);
}
}
};form form submitted to iframe
html code:
<iframe name="demoIframe" style="display:none"></iframe> <form target="demoIframe" action="upload.php" method="post" enctype="multipart/form-data"> <input class="filename" type="file" name="fileLabel"> <input type="submit" value="提交"> </form>
{
"code": "200",
"success": true,
"data": {
...
}
}$('iframe').on('load', function() {
var responseText = $('iframe')[0].contentDocument.body.textContent;
var responseData = JSON.parse(responseText) || {};
if (responseData.isSuccess == true || responseData.code == 200) {
//success
} else {
//error
}
});How beforeSend improves user experience
SpringMVC environment Ajax asynchronous request JSON method
The above is the detailed content of How to implement file upload with Ajax and form+iframe (detailed explanation with pictures and text). For more information, please follow other related articles on the PHP Chinese website!
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