xmlhttprequest | 易学教程

Why Blueimp's JQuery File Upload add all prev. selected files even if options [replaceFileInput: false] and [maxNumberOfFiles: 1] are set on init?

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问题 I have just normal form with some input fields and one file input field. I use the Blueimp's Jquery File Upload plugin to upload a file. It seems to work, if you select a file and after that click the upload button. But if you reselect files to upload, it saves all the prehistory of selections and after upload sends all the XHRs to the server. I want to upload only one currently selected file, not all the previously selected files (in file open dialog). Here is my js module to handle the

Upload multiple files with XMLHttpRequest to Express.js 3.5 Server

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问题 I'm trying to build a file uploader with the native FileAPI in JavaScript and I want to upload the files via XMLHttpRequest (without jQuery) to a Node.js server, which uses Express.js. The file reading part works fine and when I upload the file without the XMLHttpRequest it works perfectly (the files are in req.files in Express.js). The problem is the upload via AJAX: req.files is always empty. Heres some code: The form: <form action="http://localhost:3000/upload" method="POST" enctype=

What's an easy way to see what AJAX calls are being made?

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问题 I'm looking for something (preferably a Firefox extension) which will allow me to see all AJAX subrequests. Basically, anytime an XMLHTTPRequest() is made, I want to know what URL was being requested and what (if any) GET and POST vars were passed along with it. Unless I'm missing it, I don't see anything quite like this in Firebug or Web Developer Toolbar. (In case you're curious, the main reason for wanting this is that I want to scrape a local copy of a site that is using JS to load all

What's an easy way to see what AJAX calls are being made?

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Load xml from javascript

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问题 Totally new to XML and I've been struggling on this very simple objective for too long (though I can find enough on the internet about it). Just need the values out of this xml file: <?xml version="1.0" encoding="UTF-8"?> <materials> <basic> <uurloon>10</uurloon> <setloon>100</setloon> </basic> <extra> <geluid>150</geluid> <ledset>35</ledset> <strobo>20</strobo> <laser>50</laser> </extra> </materials> In javascript, I use this code to get the xml data: // load xml file if (window

Javascript XHR send multipart/form-data

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问题 I'm trying to send a multipart/form-data content-type request: var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function(){ if(xhr.readyState==4){ alert(xhr.responseText); } } xhr.open("POST", url, true); xhr.setRequestHeader("Content-Type","multipart/form-data; boundary=---------------------------275932272513031"); xhr.send('-----------------------------275932272513031 Content-Disposition: form-data; name="name" test ----------------------------275932272513031--'); Then in php I just

初识Ajax技术

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Ajax：（ A synchronous J avaScript A nd X ml）是一种整合了JavaScript、XML、CSS等现有技术 Ajax工作流程：纯javaScript的Ajax请求 XMLHttpRequest XMLHttpRequest对象可以提供在不刷新当前页面的情况下向服务器发送异步请求，并接收服务器端的返回结果。 1.创建XMLHttpRequest对象语法老版本IE（IE5和IE6） XMLHttpRequest=new ActiveXObject("Microsoft.XMLHTTP"); 新版本IE和其他大部分浏览器（推荐使用） XMLHttpRequest = new XMLHttpRequest(); 2.XMLHttpRequest对象常用属性和方法常用属性属性名称说明 readyState 返回请求的当前状态常用值： 0——未初始化 1——开始发送请求 2——请求发送完成 3——开始读取相应 4——读取响应结束 status HTTP相应状态码： 200——相应正常 400——错误请求，如语法错误 403——没有访问权限 404——资源不存在 500——服务器内部错误 responseText 以文本形式获取相应值 responseXML 以XML形式获取相应值，并且解析成DOM对象返回 statusText

XHR.getAllResponseHeaders() does not return headers as expected in Chrome 60

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问题 In our web-application, we use the XHR.getAllResponseHeaders() -function to fetch the header field names. We use the X-Access-Token to receive a JWT-token which we sent in the next request to keep session. Since today, after login in, each next request resulted in a redirect back to the login page. Strangely enough, it was only Chrome having this problem, not Firefox or Safari. And it was only on my pc, because my colleague could still login while I couldn't. We use the same software, some

Get the response Content-Type header from XHR

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问题 I would like to see whether the header was text/html or text/xml. If it was text/html then there was an error and I would rather catch that before proceeding. 回答1: Use the getResponseHeader() method. Minimal example: <script> function hand () { console.log(this.getResponseHeader('content-type')); } var x = new XMLHttpRequest(); x.onreadystatechange = hand; x.open('GET', 'index.html', true); x.send(); </script> 来源： https://stackoverflow.com/questions/4907876/get-the-response-content-type

WCF Service custom message inspector

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问题 I built a WCF Service that uses custom username and password authentication and I am testing it from the client app with the following code: using (ServiceReferenceClient.TestServiceClient tc = new ServiceReferenceClient.TestServiceClient()) { tc.ClientCredentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None; tc.ClientCredentials.UserName.UserName = "User1"; tc.ClientCredentials.UserName.Password = "Pwd1"; tc.ServiceMethod(param1, param2,