Category: JavaScript

Categories
React Answers

How to change the URL in react-router v4 without using Redirect or Link with JavaScript?

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Sometimes, we want to change the URL in react-router v4 without using Redirect or Link with JavaScript.

In this article, we’ll look at how to change the URL in react-router v4 without using Redirect or Link with JavaScript.

How to change the URL in react-router v4 without using Redirect or Link with JavaScript?

To change the URL in react-router v4 without using Redirect or Link with JavaScript, we call the history.push method.

For instance, we write

this.props.history.push("/foo");

to call history.push with '/foo' to navigate to /foo.

Conclusion

To change the URL in react-router v4 without using Redirect or Link with JavaScript, we call the history.push method.

Categories
JavaScript Answers

How to use ranges in a switch case statement using JavaScript?

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Sometimes, we want to use ranges in a switch case statement using JavaScript.

In this article, we’ll look at how to use ranges in a switch case statement using JavaScript.

How to use ranges in a switch case statement using JavaScript?

To use ranges in a switch case statement using JavaScript, we use switch with true.

For instance, we write

switch (true) {
  case myInterval < 0:
    break;
  case myInterval >= 0 && myInterval <= 2:
    doStuffWithFirstRange();
    break;
  case myInterval >= 3 && myInterval <= 5:
    doStuffWithSecondRange();
    break;
  case myInterval >= 6 && myInterval <= 7:
    doStuffWithThirdRange();
    break;
  default:
    doStuffWithAllOthers();
}

to use switch with true.

Then we check the value of myInterval with the ranges the case expressions.

Conclusion

To use ranges in a switch case statement using JavaScript, we use switch with true.

Categories
JavaScript Answers

How to convert IP to location using JavaScript?

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Sometimes, we want to convert IP to location using JavaScript.

In this article, we’ll look at how to convert IP to location using JavaScript.

How to convert IP to location using JavaScript?

To convert IP to location using JavaScript, we can use https://ipstack.com/.

For instance, we make a request to

https://api.ipstack.com/160.39.144.19

to return a JSON response with the location of 160.39.144.19.

Conclusion.

To convert IP to location using JavaScript, we can use https://ipstack.com/.

Categories
TypeScript Answers

How to fix Uncaught ReferenceError: exports is not defined in filed generated by TypeScript?

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To fix Uncaught ReferenceError: exports is not defined in filed generated by TypeScript, we fix the project config.

In tsconfig.json, we write

{
  "compilerOptions": {
    "target": "ESNext",
    "module": "CommonJS",
    "lib": ["DOM", "ES5"],
    "esModuleInterop": true
  }
}

to set esModuleInterop to true to compile ES6 modules.

And we remove "type": "module" from package.json to fix the error.

Categories
Angular Answers

How to detect back button press using router and location.go() with Angular and TypeScript?

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Sometimes, we want to detect back button press using router and location.go() with Angular and TypeScript.

In this article, we’ll look at how to detect back button press using router and location.go() with Angular and TypeScript.

How to detect back button press using router and location.go() with Angular and TypeScript?

To detect back button press using router and location.go() with Angular and TypeScript, we can listen to the popstate event.

For instance, we write

import { HostListener } from "@angular/core";

//...
export class AppComponent {
  //...
  @HostListener("window:popstate", ["$event"])
  onPopState(event) {
    console.log("Back button pressed");
  }
  //...
}

to use HostListener to listen to the window popstate event.

We set onPopState as the event’s handler.

event has the native event object.

Conclusion

To detect back button press using router and location.go() with Angular and TypeScript, we can listen to the popstate event.