JavaScript Tutorials

Some websites are blocking devtools with malicious JavaScript, so here is how to stop that without disabling JavaScript.

We can not handle HTTP POST data from JavaScript, but we can still access the data while it is in the HTML form.

getElementById should be used to select unique elements in a HTML document. Selected elements can be manipulated with JavaScript.

Should you use querySelector or getElementById?; querySelector is more flexible, and able to perform more complex selections.

the keydown event is not an ideal way to detect text-input by the user; instead you should consider using the input event.

Easily check if an element is either hovered or in focus using plain JavaScript.

The Width and Height of the browser Window can be obtained through the innerWidth and innerHeight properties; these can be checked by an event handler to detect resize events.

Cool tutorial on how to change the iframe src attribute value using JavaScript.

Learn how to use if statements in JavaScript to perform conditional execution of code.

You can either use a pure JavaScript solution, or you can choose to go with a library such as JQuery. Either way, this short tutorial show how it is done. Enjoy!