Guide: How to Design RSS Reader App using JavaScript
RSS (Really Simple Syndication) is a standardized format used by online publishers to convert syndicate their content to other websites and services. A RSS document, also known as a to feed, is a XML document with the content that a publisher wants to distribute. RSS feeds are available on almost all online news websites and blogs for their readers stay up-up to date with their contentThey can also be found at non-text based websites such as YouTube, where you can use the feed from a YouTube channel up to date with the latest videos Programs that access these feeds and read and display their content are called RSS readersYou can create a simple RSS reader program in JavaScript. In this tutorial, we will see how to
Structure of an RSS feed
An RSS feed has a root element called , similar to the tag in HTML documents. Within the tag contains a element, similar to in HTML, that contains many sub-elements with the distributed content of the website. A food usually carries something basic information such as the title, URL and description of the website and of the individual updated posts, articles or other content from that website. This information can be found in respectively There are also some optional elements which may be present in an RSS feed and provide additional information, such as images or copyrights to the distributed content. You can teach them in this RSS 2.0 specification at cyber.harvard.edu. Here’s an example of how the RSS feed from a website could look like:
Get the feed
We have to get the feed with our RSS reader application. On a website, the URL can be an RSS feed found in the tag with type application / rss + xmlFor example, you can find the following RSS feed link on Hongkiat.com. Let’s take a look first how to get the feed URL of a website using JavaScript. fetch (websiteUrl). then ((res) => {res.text (). then ((htmlTxt) => {var domParser = new DOMParser () let doc = domParser.parseFromString (htmlTxt, ‘text / html’) var feedUrl = doc.querySelector (‘link[type=”application/rss+xml”]’) .href})}). catch (() => console.error (‘Error getting website’)) The to pick up () method is a global method that fetches a resource asynchronouslyIt takes the URL of the source as an argument (the URL of the website in our code). It returns a promise object, so when the method fetches the website successfully (i.e. the promise is fulfilled), the first function in the then () statement handles the retrieved answer (see code above). The retrieved answer is then read completely in a text string the habits text() method. This text represents the HTML text from our retrieved websiteLike fetch (), text () too returns a Promise objectSo if it successfully creates a response text from the response flow, then () will handle that response text (htmlText in the above code). As soon as HTML text from the website is available, we use DOMParser API to parse it into a DOM documentDOMParser parses an XML / HTML text string in a DOM document. His method, parseFromString (), takes two arguments: the text to be parsed and the content type Then we go from the created DOM document find the href value of the relevant one tag using the querySelector () method to get the URL of the feed.
Parse and display the feed
Once we have the feed URL of the website, we need to do that get and read the RSS document found at that URL. fetch (feedUrl). then ((res) => {res.text (). then ((xmlTxt) => {var domParser = new DOMParser () let doc = domParser.parseFromString (xmlTxt, ‘text / xml’) doc .querySelectorAll (‘item ‘). forEach ((item) => {let h1 = document.createElement (‘ h1 ‘) h1.textContent = item.querySelector (‘ title ‘). textContentdocument.querySelector (‘ output ‘). appendChild (h1)}) })}) The same way we pulled up and parsed the website, now we have fetch and parse the XML feed into a DOM documentTo achieve this, we use the content type ‘text / xml’ in the parseFromString () method. In the parsed document, we select all elements using the querySelectorAll method and walk through each Within each element we can access tags like
How to Design RSS Reader App using JavaScript: benefits
Faq
Final note
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