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JavaScript Promises
Promises in JavaScript allow us to do asynchronous operations where the value is not known in advanced when the promise was being created. A promise can have three states pending, fulfilled and rejected.
Following is the code for promises in JavaScript −
Example
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } </style> </head> <body> <h1>JavaScript Promises</h1> <div class="sample"></div> <button class="Btn">CLICK HERE</button> <h3> Click on the above button to display username using promises </h3> <script> let sampleEle = document.querySelector(".sample"); document.querySelector(".Btn").addEventListener("click", () => { fetch("https://jsonplaceholder.typicode.com/users") .then((response) => response.json()) .then((result) => { result.forEach((element) => { sampleEle.innerHTML += element.username + "<br>"; }); }) .catch((err) => alert(err)); }); </script> </body> </html> Output
On clicking the ‘CLICK HERE’ button −
Updated on: 2020-05-11T14:13:06+05:30
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