Category: JavaScript Answers

Sometimes, we want to refresh an iframe using JavaScript.

In this article, we’ll look at how to refresh an iframe using JavaScript.

How to refresh an iframe using JavaScript?

To refresh an iframe using JavaScript, we call iframe.contentWindow.location.reload();.

For instance, we write

const iframe = document.getElementById("youriframe");
iframe.contentWindow.location.reload();

to get the iframe with getElementById.

Then we call iframe.contentWindow.location.reload to reload the iframe.

Conclusion

To refresh an iframe using JavaScript, we call iframe.contentWindow.location.reload();.

Sometimes, we want to fix string.split is not a function with JavaScript.

In this article, we’ll look at how to fix string.split is not a function with JavaScript.

How to fix string.split is not a function with JavaScript?

To fix string.split is not a function with JavaScript, we should make sure we’re calling split on a string.

For instance, we write

const string = document.location.toString();

to convert document.location to a string with toString before we call split on it.

Conclusion

To fix string.split is not a function with JavaScript, we should make sure we’re calling split on a string.

Sometimes, we want to reject promise and catch the error if status is not OK with fetch and JavaScript.

In this article, we’ll look at how to reject promise and catch the error if status is not OK with fetch and JavaScript.

How to reject promise and catch the error if status is not OK with fetch and JavaScript?

To reject promise and catch the error if status is not OK with fetch and JavaScript, we can check the response.ok property.

For instance, we write

const response = await fetch(url);
if (response.ok) {
  return response.json();
} else {
  throw new Error("Something went wrong");
}

to make a get request to url by calling fetch with url.

Then we check if response.ok with true from the promise returned.

If it is, then we return response body returned by response.json

Otherwise, we throw an error.

This code should be in an async function.

Conclusion

To reject promise and catch the error if status is not OK with fetch and JavaScript, we can check the response.ok property.

Sometimes, we want to truncate an array with JavaScript.

In this article, we’ll look at how to truncate an array with JavaScript.

How to truncate an array with JavaScript?

To truncate an array with JavaScript, we can use the array slice method.

For instance, we write

let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
arr = arr.slice(0, 4);
console.log(arr);

to call arr.slice with 0 and 4 to get an array with the first 4 items of arr.

Then we assign the returned array back to arr to update it.

Conclusion

To truncate an array with JavaScript, we can use the array slice method.

Sometimes, we want to find element’s position relative to the document with JavaScript.

In this article, we’ll look at how to find element’s position relative to the document with JavaScript.

How to find element’s position relative to the document with JavaScript?

To find element’s position relative to the document with JavaScript, we can get the sum of the top value of the element and the document’s scrollTop value.

For instance, we write

element.getBoundingClientRect().top + document.documentElement.scrollTop;

to get position of the element relative to the top of the viewport with element.getBoundingClientRect().top.

And we add the viewport offset with scrollTop and add that to top.

Conclusion

To find element’s position relative to the document with JavaScript, we can get the sum of the top value of the element and the document’s scrollTop value.