Author: John Au-Yeung

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.

Sometimes, we want to verify image URL with JavaScript.

In this article, we’ll look at how to verify image URL with JavaScript.

How to verify image URL with JavaScript?

To verify image URL with JavaScript, we can try to load the URL into an Image object.

For instance, we write

const doesImageExist = (url) =>
  new Promise((resolve) => {
    const img = new Image();

    img.src = url;
    img.onload = () => resolve(true);
    img.onerror = () => resolve(false);
  });

to define the doesImageExist function that returns a promise.

We define a promise with the Promise constructor called with a function that creates an Image object.

We set the src property to url to load the url into the img element.

And then we listen for success or error by setting the onload and onerror properties to functions respectively.

When onload is called, the url is a valid image URL so we call resolve with true.

If onerror is called, the url isn’t a valid image URL so we call resolve with false.

Conclusion

To verify image URL with JavaScript, we can try to load the URL into an Image object.

Sometimes, we want to find by text content with Cypress and JavaScript.

In this article, we’ll look at how to find by text content with Cypress and JavaScript.

How to find by text content with Cypress and JavaScript?

To find by text content with Cypress and JavaScript, we use the contains method.

For instance, we write

cy.get(".YOUR_BUTTON_CLASS").contains("Customer");

to call get to get the element with class YOUR_BUTTON_CLASS.

Then we call contains to find the element in the button that has text 'Customer'.

Conclusion

To find by text content with Cypress and JavaScript, we use the contains method.