Category: JavaScript Answers

Sometimes, we want to toggle display: none style with JavaScript.

In this article, we’ll look at how to toggle display: none style with JavaScript.

How to toggle display: none style with JavaScript?

To toggle display: none style with JavaScript, we set the style.display property.

For instance, we write

const yourUl = document.getElementById("yourUlId");
yourUl.style.display = yourUl.style.display === "none" ? "" : "none";

to select the element to modify with getElementById.

Then we set its style.display property to '' is it’s currently 'none'.

Otherwise, we set it to 'none'.

Conclusion

To toggle display: none style with JavaScript, we set the style.display property.

To flatten an array of arrays of objects with JavaScript, we use the array flat method.

For instance, we write

const flattenedArr = [["object1"], ["object2"]].flat();

to return a flattened version of the nested array with flat.

Conclusion

To flatten an array of arrays of objects with JavaScript, we use the array flat method.

Sometimes, we want to create XML in JavaScript.

In this article, we’ll look at how to create XML in JavaScript.

How to create XML in JavaScript?

To create XML in JavaScript, we sue the DOMParser constructor.

For instance, we write

const xmlString = "<root></root>";
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, "text/xml");

to create the parser DOMParser object.

Then we call parser.parseFromString with xmlString to convert it into an XML DOM object.

Conclusion

To create XML in JavaScript, we sue the DOMParser constructor.

Sometimes, we want to replace both double and single quotes in JavaScript string.

In this article, we’ll look at how to replace both double and single quotes in JavaScript string.

How to replace both double and single quotes in JavaScript string?

To replace both double and single quotes in JavaScript string, we call the replace method.

For instance, we write

const newStr = str.replace(/["']/g, "");

to call str.replace with a regex that matches all single and double quotes.

And we replace them all with empty strings.

The g flag makes replace replace all matches.

Conclusion

To replace both double and single quotes in JavaScript string, we call the replace method.

Sometimes, we want to call Mongoose find with multiple conditions with JavaScript.

In this article, we’ll look at how to call Mongoose find with multiple conditions with JavaScript.

How to call Mongoose find with multiple conditions with JavaScript?

To call Mongoose find with multiple conditions with JavaScript, we call the find method with an object with all the conditions.

For instance, we write

User.find({ region: "NA", sector: "Some Sector" }, (err, user) => {
  if (err) {
    console.log(err);
  }
  console.log(user);
});

to search for a User entryt with region set to 'NA' and sector set to 'abc'.

We get errors for the query from err.

And we get the query result from user.

Conclusion

To call Mongoose find with multiple conditions with JavaScript, we call the find method with an object with all the conditions.