The FileReader API lets web applications asynchronously read the contents of files (or raw data buffers) stored on the user's computer, using File or Blob objects to specify the file or data to read. As well as this, it can also be used to test addressed nodes within a document to determine whether they match a pattern or not. XPath stands for XML Path Language, it uses a non-XML syntax that provides a flexible way of addressing (pointing to) different parts of an XML document. How to parse an XML document from a string, a file or via JavaScript and how to serialize XML documents to strings or files. Its primary purpose is to facilitate the sharing of data across different systems, particularly systems connected via the Internet. It is a simplified subset of SGML, capable of describing many kinds of data. The Extensible Markup Language (XML) is a W3C-recommended general-purpose markup language for creating special-purpose markup languages. This article will show some Ajax I/O techniques. The response property will contain the entity body according to responseType, as an ArrayBuffer, Blob, Document, JSON, or string. Possible values are the empty string (default), arraybuffer, blob, document, json, and text. The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. This article provides a working (minimalist) example of a pure-Ajax website composed only of three pages. Submitting forms and upload binary files – in pure Ajax, or using FormData objects.Analyzing and manipulating the response of the server.This article will explain how to use some Ajax techniques, like: The XMLHttpRequest API is the core of Ajax. Html Make a request ( ( ) => setInterval (fetchData, 5000 ) Related technologies For example, use the following before calling send() for form data sent as a query string: Note that if you want to POST data, you may have to set the MIME type of the request. Or other formats, like multipart/form-data, JSON, XML, and so on. Form data should be sent in a format that the server can parse, like a query string: "name=value&anothername="+encodeURIComponent(myVar)+"&so=on" The parameter to the send() method can be any data you want to send to the server if POST-ing the request. If true (the default), JavaScript execution will continue and the user can interact with the page while the server response has yet to arrive. The optional third parameter sets whether the request is asynchronous.A common pitfall is accessing your site by domain.tld, but attempting to call pages with If you really need to send a request to another domain, see HTTP access control (CORS). Be sure to use the exact domain name on all of your pages or you will get a "permission denied" error when you call open(). As a security feature, you cannot call URLs on 3rd-party domains by default.
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