How to Implement Delay in TypeScript for Redirect After Form Submission

General Discussions
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1

I’m developing a website in Angular 2 using TypeScript, and I need to implement a delay function similar to thread.sleep(ms). Specifically, I want to redirect users a few seconds after they submit a form. While this is straightforward in JavaScript, I’m not sure how to achieve it in TypeScript. Could you provide guidance on implementing a typescript sleep function for this purpose?

2

Ah, this is a common need in modern TypeScript development, especially when dealing with delays like redirects after form submissions. For a clean implementation of a typescript sleep function, we can leverage async/await, which was introduced in TypeScript 2.0 for ES6.

Here’s how you can implement a delay function using a Promise:

function delay(ms: number) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

You can call it like this:

(async () => {
    console.log('Before delay');
    await delay(1000); // 1-second delay
    console.log('After delay');
})();

With async/await, your code becomes much more readable compared to callback-based methods. Just remember, await can only be used within an async function. For browsers that don’t support ES6 natively, you may need a polyfill for Promises if compiling down to ES5.

Here’s a quick reminder: if you want to use this delay function in another module, don’t forget to export it:

export { delay };

In older JavaScript (ES5), you would use setTimeout, but most browsers now support the modern approach.

3

if you specifically need a typescript sleep function to implement a redirect after a form submission, this works perfectly! You can use setTimeout in Angular like so:

setTimeout(() => {
    this.router.navigate(['/']);
}, 5000);

This snippet essentially redirects the user after a 5-second delay. It’s straightforward and effective for handling navigation after user actions. The use of setTimeout is still a reliable way to handle such scenarios in Angular.

4

I agree with both of the above answers, but if you’re working in an ES6 environment, there’s an even cleaner approach. Starting in Node.js 15, you can use the built-in timers/promises module to achieve the same typescript sleep behavior with minimal code:


import { setTimeout } from 'timers/promises';

await setTimeout(5000);

This method is both elegant and concise for handling delays in environments that fully support ES6. It avoids some of the verbosity of the traditional setTimeout method and pairs nicely with modern JavaScript standards.