Author: John Au-Yeung

Sometimes, we want to resize an HTML canvas element with JavaScript.

In this article, we’ll look at how to resize an HTML canvas element with JavaScript.

How to resize an HTML canvas element with JavaScript?

To resize an HTML canvas element with JavaScript, we set the canvas element’s width and height properties.

For instance, we write

canvasNode.width = 200;
canvasNode.height = 100;

to set the width and height of the canvas element.

Conclusion

To resize an HTML canvas element with JavaScript, we set the canvas element’s width and height properties.

Sometimes, we want to rotate a mesh by 90 degrees in Three.js and JavaScript.

In this article, we’ll look at how to rotate a mesh by 90 degrees in Three.js and JavaScript.

How to rotate a mesh by 90 degrees in Three.js and JavaScript?

To rotate a mesh by 90 degrees in Three.js and JavaScript, we set the rotation.x property of the mesh.

For instance, we write

mesh.rotation.x = Math.PI / 2;

to rotate the mesh by 90 degrees, which is Math.PI / 2 radians.

Conclusion

To rotate a mesh by 90 degrees in Three.js and JavaScript, we set the rotation.x property of the mesh.

Sometimes, we want to remove the parent element using plain JavaScript.

In this article, we’ll look at how to remove the parent element using plain JavaScript.

How to remove the parent element using plain JavaScript?

To remove the parent element using plain JavaScript, we call the parentElement.remove method.

For instance, we write

el.parentElement.remove();

to call parentElement.remove to remove element el‘s parent element.

Conclusion

To remove the parent element using plain JavaScript, we call the parentElement.remove method.

Sometimes, we want to match only English letters with JavaScript regex.

In this article, we’ll look at how to match only English letters with JavaScript regex.

How to match only English letters with JavaScript regex?

To match only English letters with JavaScript regex, we use a regex that matches upper and lower letters only.

For instance, we write

const res = /^[a-zA-Z]+$/.test("abcd");
console.log(res);

to match upper and lower case letters with a-z and A-Z.

^ indicates the start of the string and $ indicates the end.

We call test to check if 'abcd' matches the pattern.

Conclusion

To match only English letters with JavaScript regex, we use a regex that matches upper and lower letters only.

Sometimes, we want to center and zoom on displayed markers with Google Map API v3.

In this article, we’ll look at how to center and zoom on displayed markers with Google Map API v3.

How to center and zoom on displayed markers with Google Map API v3?

To center and zoom on displayed markers with Google Map API v3, we call the setCenter and fitBounds methods.

For instance, we write

const bounds = markers.reduce((bounds, marker) => {
  return bounds.extend(marker.getPosition());
}, new google.maps.LatLngBounds());

map.setCenter(bounds.getCenter());
map.fitBounds(bounds);

to create the bounds with the marker location.

Then we call setCenter to center the map at the center of the bounds.

And then we call fitBounds to fit the map to the bounds.

Conclusion

To center and zoom on displayed markers with Google Map API v3, we call the setCenter and fitBounds methods.