This article mainly introduces the use of Jquery upload plug-in webupload in detail, which has certain reference value. Interested friends can refer to it
WebUploader is developed by Baidu WebFE (FEX) team A simple modern file upload component developed based on HTML5 and supplemented by FLASH. It can give full play to the advantages of HTML5 in modern browsers without abandoning the mainstream IE browser. It uses the original FLASH runtime and is compatible with IE6+, iOS 6+, android 4+. The two sets of runtimes have the same calling method and can be selected by the user. The use of concurrent uploading of large files in fragments greatly improves the efficiency of file uploading.
This plug-in is easy to use and has more powerful functions. It is more powerful than ajaxfileupload. You can download it from the official website.
Currently, only the image batch upload function is used in the project. The official examples have been written in great detail. Here is how to migrate the official examples to your own project:
// 实例化 uploader = WebUploader.create({ pick: { id: '#filePicker', label: '点击选择图片' }, formData: { uid: 123 }, dnd: '#dndArea', paste: '#uploader', swf: '../../dist/Uploader.swf', chunked: false, chunkSize: 512 * 1024, server: '../../server/fileupload.php', // runtimeOrder: 'flash', // accept: { // title: 'Images', // extensions: 'gif,jpg,jpeg,bmp,png', // mimeTypes: 'image/*' // }, // 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候,把图片打开。 disableGlobalDnd: true, fileNumLimit: 300, fileSizeLimit: 200 * 1024 * 1024, // 200 M fileSingleSizeLimit: 50 * 1024 * 1024 // 50 M });
1. The server is modified to use its own background processing class to obtain the images uploaded by the plug-in through HttpFileCollection files = System.Web.HttpContext.Current.Request.Files; request.Files.
2. The sample program enables compression by default. This can be set. When the image is larger than a certain size, the image can be automatically compressed. If compression is not required, you need to add compress:false, attribute ## during initialization.
#3,accept: { title: 'Images', extensions: 'gif,jpg,jpeg,bmp,png', mimeTypes: 'image/*' },The official example of uploading pictures has commented out the picture filtering for some reason. If you want to upload only pictures, then Need to remove the comment 4. Added the judgment of the pixel size of the picture. I used the uploadAccept method. I submitted the picture and then judged it in the background. (I don’t know if there is a better way.) Because the plug-in The file class itself can process files, so it does not obtain the pixel attributes separately. Example:
uploader.on('uploadAccept', function (object, ret) { var resJson = $.parseJSON(ret._raw); if (resJson.result == "error") { alert(object.file.name + "象素太低,请检查上传!"); return false; } });When this method returns false, it will cause the image upload to fail. Therefore, after the background determines the pixels, the status of the image upload is changed through the status returned by the background.
The above is the detailed content of How to use the upload function webupload in jQuery. For more information, please follow other related articles on the PHP Chinese website!

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。


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