Download File Data From Server

Another very common task in modern websites and applications is retrieving individual data items from the server to update sections of a webpage without having to load an entire new page. This seemingly small detail has had a huge impact on the performance and behavior of sites, so in this article, we'll explain the concept and look at technologies that make it possible: in particular, the Fetch API.

A web page consists of an HTML page and (usually) various other files, such as stylesheets, scripts, and images. The basic model of page loading on the Web is that your browser makes one or more HTTP requests to the server for the files needed to display the page, and the server responds with the requested files. If you visit another page, the browser requests the new files, and the server responds with them.

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The main API here is the Fetch API. This enables JavaScript running in a page to make an HTTP request to a server to retrieve specific resources. When the server provides them, the JavaScript can use the data to update the page, typically by using DOM manipulation APIs. The data requested is often JSON, which is a good format for transferring structured data, but can also be HTML or just text.

Note: In the early days, this general technique was known as Asynchronous JavaScript and XML (Ajax), because it tended to request XML data. This is normally not the case these days (you'd be more likely to request JSON), but the result is still the same, and the term "Ajax" is still often used to describe the technique.

To speed things up even further, some sites also store assets and data on the user's computer when they are first requested, meaning that on subsequent visits they use the local versions instead of downloading fresh copies every time the page is first loaded. The content is only reloaded from the server when it has been updated.

This series of files will act as our fake database; in a real application, we'd be more likely to use a server-side language like PHP, Python, or Node to request our data from a database. Here, however, we want to keep it simple and concentrate on the client-side part of this.

However, web servers tend to be case-sensitive, and the file name doesn't have a space in it. To convert "Verse 1" to "verse1.txt" we need to convert the 'V' to lower case, remove the space, and add ".txt" on the end. This can be done with replace(), toLowerCase(), and template literal. Add the following lines inside your updateDisplay() function:

So because fetch() returns a promise, we pass a function into the then() method of the returned promise. This method will be called when the HTTP request has received a response from the server. In the handler, we check that the request succeeded, and throw an error if it didn't. Otherwise, we call response.text(), to get the response body as text.

There is quite a lot of complex code that deals with filtering the products by category and search terms, manipulating strings so the data displays correctly in the UI, etc. We won't discuss all of it in the article, but you can find extensive comments in the code (see can-script.js).

Next we pass a function into the then() method of that returned promise. This function will be passed an object containing the response data as JSON, which we pass into the initialize() function. This function which starts the process of displaying all the products in the user interface.

This works in much the same way as the previous one, except that instead of using json(), we use blob(). In this case we want to return our response as an image file, and the data format we use for that is Blob (the term is an abbreviation of "Binary Large Object" and can basically be used to represent large file-like objects, such as images or video files).

Note: In the early days, this general technique was known as Asynchronous JavaScript and XML (Ajax), because it tended to request XML data. This is normally not the case these days (you'd be more likely to request JSON), but the result is still the same, and the term \"Ajax\" is still often used to describe the technique.

However, web servers tend to be case-sensitive, and the file name doesn't have a space in it. To convert \"Verse 1\" to \"verse1.txt\" we need to convert the 'V' to lower case, remove the space, and add \".txt\" on the end. This can be done with replace(), toLowerCase(), and template literal. Add the following lines inside your updateDisplay() function:

This works in much the same way as the previous one, except that instead of using json(), we use blob(). In this case we want to return our response as an image file, and the data format we use for that is Blob (the term is an abbreviation of \"Binary Large Object\" and can basically be used to represent large file-like objects, such as images or video files).

The Precipitation Frequency Data Server (PFDS) is a point-and-click interface developed to deliver NOAA Atlas 14 precipitation frequency estimates and associated information. Upon clicking a state on the map above or selecting a state name from the drop-down menu, an interactive map of that state will be displayed. From there, a user can identify a location for which precipitation frequency estimates are needed.

Estimates and their confidence intervals can be displayed directly as tables or graphs via separate tabs. Links to supplementary information (such as ASCII grids of estimates, associated temporal distributions of heavy rainfall, time series data at observation sites, cartographic maps, etc.) can also be found.

I understand currently the recommended way to update data in a RSC component from a client component to be router.refresh() . This work's fine if I'm mutating data on the same page. How do I refresh data in a RSC from a different page though, for example using router.push(path)? For context, I have a list of items, when I click on an item in the list I am taken to that item's page where there is a delete button. I'd like to redirect the user to main list page after they click delete, and show the updated list. In my RSC where I fetch the initial data, I have export const dynamic = 'force-dynamic' ,but on redirect the list still has the stale data and only manually refreshing the page will the data update. Any insights will be appreciated, thanks!

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