“First, the white square on the black background” - He typed in those first lines of css code into the file body, html He’s actually using Sass for his project, but to facilitate major readers, I’ll write it in plain css. One hand on the keyboard, his other hand quickly controls the mouse to switch to the css file. Closed his eyes, everything was clear in his mind, a white rectangle on a black background with 4 white circle resizer at 4 of its corners. “That should do it” - He laid back to his pillow before moving on to the css code. “It should be a square with 4 resizers at its 4 corners” - His thought went through his naive brain and passed down to his hand then finally command all 8 of his 10 fingers to type the correct letter for the html structure.

Like every other start, he first created a html structure for the “resizable div”. His arrogant when up, “can’t be that hard” - He said with a smile on his face without knowing that the problem he’s about to encounter is going to take a great deal of his knowledge and experience to solve. As he was scrolling aimlessly through a long list of JavaScript functions, he stumbled on an empty function named makeResizableDiv(div). “Perfect time for programming” - Hung said. It was a quiet night with a perfect temperature for the brain to give 100%.

Here's a common debounce floating around the net, though do look for more advanced ones as featuerd in lodash.Making a resizable div in JS is not easy as you think

Window.addEventListener('resize',debounce(handler, delay, immediate),false) Use a debounce function to mitigate the excess calls. The resize event should never be used directly as it is fired continuously as we resize.

Function on resize javascript