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This JavaScript snippet dynamically loads external scripts with a delay after the page has fully loaded.
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Script Loader Example</title> | |
| </head> | |
| <body> | |
| <h1>Script Loading Example</h1> | |
| <script> | |
| function loadScript(url) { | |
| return new Promise(function(resolve, reject) { | |
| let script = document.createElement('script'); | |
| script.src = url; | |
| script.async = false; // Ensures execution order is maintained | |
| script.onload = function() { | |
| resolve(url); | |
| }; | |
| script.onerror = function() { | |
| reject(url); | |
| }; | |
| document.body.appendChild(script); | |
| }); | |
| } | |
| function start_app(){ | |
| alert('start_app'); | |
| } | |
| let promises = []; | |
| let scripts = [ | |
| "https://code.jquery.com/jquery-3.6.0.min.js", // A valid script | |
| //"https://invalid-url.com/script.js" // An invalid script to test error handling | |
| ]; | |
| let delayTime = 3000; //ms | |
| document.addEventListener("DOMContentLoaded", function(event) { | |
| setTimeout(() => { | |
| scripts.forEach(function(url) { | |
| promises.push(loadScript(url)); | |
| }); | |
| Promise.all(promises) | |
| .then(function() { | |
| console.log('All scripts loaded successfully'); | |
| start_app(); | |
| }) | |
| .catch(function(script) { | |
| console.log(script + ' failed to load'); | |
| }); | |
| }, delayTime); // Delay of 3 seconds | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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