Category: JavaScript Answers

Sometimes, we want to validate google reCAPTCHA v2 using JavaScript.

In this article, we’ll look at how to validate google reCAPTCHA v2 using JavaScript.

How to validate google reCAPTCHA v2 using JavaScript?

To validate google reCAPTCHA v2 using JavaScript, we use the grecaptcha.getRespons method.

For instance, we write

const response = grecaptcha.getResponse();

if (response) {
  // ...
} else {
  //...
}

to call grecaptcha.getResponse method to get the captcha validation result.

If response isn’t null, then the captcha is verified.

Otherwise, it’s not.

Conclusion

To validate google reCAPTCHA v2 using JavaScript, we use the grecaptcha.getRespons method.

Sometimes, we want to load local JSON file into variable with JavaScript.

In this article, we’ll look at how to load local JSON file into variable with JavaScript.

How to load local JSON file into variable with JavaScript?

To load local JSON file into variable with JavaScript, we can import the JSON file with import.

For instance, we write

{
  "name": "testing"
}

in example.json.

Then we import example.json and get the name property in the JSON object by writing

import * as data from "./example.json";

const { name } = data;

Conclusion

To load local JSON file into variable with JavaScript, we can import the JSON file with import.

Sometimes, we want to implement regions/code collapse in JavaScript.

In this article, we’ll look at how to implement regions/code collapse in JavaScript.

How to implement regions/code collapse in JavaScript?

To implement regions/code collapse in JavaScript, we add comments for region markers.

For instance, we write

//#region MyRegion1

const foo = () => {};

//#endregion

//#region MyRegion2

const bar = () => {};

//#endregion

to wrap our code with region markers.

We use #region to mark the start of a region and use #endregion to mark the end of a region.

Then we can expand or collapse the code in Visual Studio or Visual Studio Code.

Conclusion

To implement regions/code collapse in JavaScript, we add comments for region markers.

Sometimes, we want to add a new array element to a JSON object with JavaScript.

In this article, we’ll look at how to add a new array element to a JSON object with JavaScript.

How to add a new array element to a JSON object with JavaScript?

To add a new array element to a JSON object with JavaScript, we parse the JSON string into an object, add the item to the array in the object, and the convert the object back to a JSON string.

For instance, we write

let jsonStr =
  '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

const obj = JSON.parse(jsonStr);
obj["theTeam"].push({ teamId: "4", status: "pending" });
jsonStr = JSON.stringify(obj);

to call JSON.parse to parse jsonStr into an object.

Then we call push to push a new entry into the obj["theTeam"] array.

Finally we call JSON.stringify to convert obj back into a JSON string.

Conclusion

To add a new array element to a JSON object with JavaScript, we parse the JSON string into an object, add the item to the array in the object, and the convert the object back to a JSON string.

Sometimes, we want to check if character is number with JavaScript.

In this article, we’ll look at how to check if character is number with JavaScript.

How to check if character is number with JavaScript?

To check if character is number with JavaScript, we can use the regex test method.

For instance, we write

const isNumeric = (str) => {
  return /^\d+$/.test(str);
};

to define the isNumeric function that checks if str is a number with /^\d+$/.test.

\d+ matches strings that has all digits inside.

Conclusion

To check if character is number with JavaScript, we can use the regex test method.