How to Create a Bootstrap Spinner and Display on Screen till the data from the API loads ?

0 0 1 minute read

The task is to display a spinner on the page until the data response from the API comes. We have taken bootstrap spinner to show the example.

Pre-requisite:

You will need some knowledge about JavaScript fetch API.
You will need a mock API for getting data.

Approach:

Create necessary HTML, CSS, and JavaScript file for the task.
In HTML file, link bootstrap in head section.

<link rel=”stylesheet” href=”https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css” integrity=”sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh” crossorigin=”anonymous”>

Now take any spinner from “https://getbootstrap.com/docs/4.4/components/spinners/“, The spinner I had taken for the example is:
```
<div class="spinner-border text-primary" 
    id="spinner"role="status">
    <span class="sr-only">Loading...</span>
</div>
```

Now, spinner will have to be stopped once the data from the API loads.
So, get the data from API by Fetch() API method.
Store the data in a response variable.
There is an if statement that checks if Response from API came or not.
If Response came then there is a function hideSpinner() called.
In that hideSpinner() function by using DOM manipulation, we set display of Spinner element to none.

HTML file:

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="script.js"></script> 
    <title>Spinner</title> 
    <link rel="stylesheet" href="style.css"> 
    <link rel="stylesheet" href= 
"https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
        integrity= 
"sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
        crossorigin="anonymous"> 
</head> 
  
<body> 
    <div class="spinner-border text-primary" 
        id="spinner" role="status"> 
        <span class="sr-only">Loading...</span> 
    </div> 
    <div id="data"></div> 
</body> 
  
</html> 

JavaScript file:

// API url  
const api_url = 
"https://mygfgapi.free.beeceptor.com/my/api/path"; 
  
// Defining async function  
async function getapi(url) { 
  
    // Storing response  
    const response = await fetch(url); 
  
    // Storing data in form of JSON  
    var apidata = await response.json(); 
    console.log(apidata); 
    if (response) { 
        hideSpinner(); 
    } 
    document.getElementById("data").innerHTML 
        = `<h1>${apidata.data}</h1>`; 
} 
  
// Calling that async function  
getapi(api_url); 
  
// Function to hide the Spinner 
function hideSpinner() { 
    document.getElementById('spinner') 
            .style.display = 'none'; 
}  