fix JavaScript fetch is delayed
JavaScript fetch is delayed
From This is a tutorial of fetching data from the server using JavaScript and jQuery.
The fetch() function is not new to JavaScript. It has been supported for a while by major browsers, but only recently was it implemented in jQuery.
Actually, this article will focus on one particular topic: how and why is the fetch() delayed?
Create an epic blog intro:
"JavaScript fetch is delayed" is a tutorial of fetching data from the server using JavaScript and jQuery. The fetch() function is not new to JavaScript. It has been supported for a while by major browsers, but only recently was it implemented in jQuery.
Actually, this article will focus on one particular topic: how and why is the fetch() delayed?
Why is fetch() delayed?
The fetch() function is a synchronous function. Synchronous functions wait for an operation to finish before moving to the next line. For example, if you have a function called setTimeout(), you must wait for that function to finish before you can execute the next line of code.
However, fetch() has a delay because the browsers need to be able to show a visual response to the user.
In order to do that, the browsers have to load the code of the website in the client’s browser.
Once that code has been loaded, the fetch() function can be executed.
The only problem is that the code is still not fully loaded when the fetch() function is executed. That’s why it has a delay.
But what if the user has JavaScript disabled?
If JavaScript is disabled, the browser will not be able to load the code. This is why it is a good idea to add the defer attribute to the script tag. This attribute will make the browser wait for the code to load. This means that when the browser has finished loading the code, the fetch() function will be executed.
In order to learn more about the fetch() function, I highly recommend reading this article.
If you have any questions about the fetch() function, you can always leave a comment below.
Recently, some people have been experiencing a delay in executing JavaScript fetch (https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest) methods before using XMLHttpRequest to make web API requests.
As we know, the JavaScript fetch is executed before running an API call; we used it before to get more accurate response data and improve the browser behavior.
It's necessary for implementations to put the API call after the end of the JavaScript fetch or its parent function has already been executed.
The developer tool "console" provides more accurate response data; close console; open console; and see if it still happens... Below is a demo: // 1. open the console
// 2. open the "HTML" tab and press "F12" to view the source code
// 3. find the script tag, open the "Network" tab and view the response time.
// 4. close the "Network" tab and close the console
// 5. repeat step 2-4.
Get fetch function code in the JavaScript console:
// 1. open the console
// 2. open the "HTML" tab and press "F12" to view the source code
// 3. find the script tag, open the "Network" tab and view the response time.
// 4. close the "Network" tab and close the console
// 5. repeat step 2-4.
Step 2: open the "Network" tab and view the response time.
Step 3: repeat step 2-4.
Step 4: close the "Network" tab and close the console.
Step 5: repeat step 2-4.
The above results show that, when using fetch, there is a delay before the response is shown.
How to avoid this delay?
You can do one of two things:
If the fetch() function is at the end of the page, use the defer attribute. If the fetch() function is not at the end of the page, add the async attribute to the script tag.
In fact, the developer tool "console" can tell you when the fetch() function has been executed, so you can just add the async attribute to the script tag and be done with it.
Below is a demo: // 1. open the console
// 2. open the "HTML" tab and press "F12" to view the source code
// 3. find the script tag, open the "Network" tab and view the response time.
// 4. close the "Network" tab and close the console
// 5. repeat step 2-4.
// 6
Untitled Document
function myFunction() {
fetch('https://api.myjson.com/bins/v1/getproducts.
JavaScript Fetch is Delayed
The JavaScript Fetch is Delayed.
The JavaScript Fetch API is designed to provide a simple and easy way to fetch data from remote servers. It's a native JS alternative to Ajax. The idea is simple, just call a function that takes two parameters: the URL to the server you want to get the data from, and an object of options. For example, you can create a GET request like so: var xhr = new XMLHttpRequest(); xhr.open("GET", "http://www.example.com/some_data", true); xhr.send(); There is also a set of common options that we can pass into the function: xhr.withCredentials=true; xhr.responseType="json"; So, you've got the basics, now how do you actually send the request? The function returns a promise, so let's handle that first: // Get the data var promise = xhr.fetch("http ://www.example.com/some_data", { responseType: "json" }); // Wait for the data to load var response = await promise; // If we want to make sure that we are only using data from // the most recent request, then we need to make sure we're sending // the request again after we have loaded the data. We can do that // by using the request property of the promise object. var response = await promise.request(); Now, let's put it all together and make sure that it works: // Get the data var promise = xhr.fetch("http://www.example. com/some_data", { responseType: "json" }); // Wait for the data to load var response = await promise; // If we want to make sure that we are only using data from // the most recent request, then we need to make sure we're sending // the request again after we have loaded the data. We can do that // by using the request property of the promise object. var response = await promise.request(); console.log(response.json); // Show the result here. This will print out the JSON from // the server.
}
JavaScript Fetch API is Delayed
The JavaScript Fetch API is Delayed.
JavaScript Fetch API (previously known as XMLHttpRequest) is a new JavaScript API which allows you to easily and efficiently fetch data from the web. This is a simple and lightweight way of sending GET requests to servers, using the built-in XMLHttpRequest object. It enables your JavaScript code to download resources like JSON, HTML, XML, images, etc.
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