CODEWITHSUNDEEP
javascripthtmlcssgoogle-chrome-devtools
Craig1123
Craig1123

Reputation: 1560

Highlight HTML element just like the Chrome Dev Tools in Javascript

WolfPack!

I want to highlight any element I hover over just like the Chrome Dev Tools does it.

Picture of Chrome Dev Tools

Notice how the entire element is drenched in a blue tint? This is not as simple as adding a background color or linear-gradient because the insides of input elements are still white.

I've tried using the different filter methods like hue rotate, contrast w/brightness, and even THIS MONSTER, but nothing seems to work.

The closest I've been is just a nice looking box-shadow around the elements for highlighting.

Javascript: element.classList.add('anotherClass')

CSS: box-shadow: 0 0 5px #3fd290, 0 0 10px #36A9F7, 0 0 15px #36A9F7, 0 0 20px #36A9F7 !important;

Help me make my dreams come true

Upvotes: 2

Views: 3598

Answers (2)

Craig1123
Craig1123

Reputation: 1560

If anyone cares what I did to solve it, here is my code (thanks to the help of Roope):

onMouseEnter:

highlightElement(event){
  const hoverableElements = document.querySelectorAll('[data-attr]');
  for(let elm of hoverableElements){
    const styles = elm.getBoundingClientRect()
      if(event.currentTarget.textContent === elm.dataset.dataAttr) {
        let div = document.createElement('div');
        div.className = 'anotherClass';
        div.style.position = 'absolute';
        div.style.content = '';
        div.style.height = `${styles.height}px`;
        div.style.width = `${styles.width}px`;
        div.style.top = `${styles.top}px`;
        div.style.right = `${styles.right}px`;
        div.style.bottom = `${styles.bottom}px`;
        div.style.left = `${styles.left}px`;
        div.style.background = '#05f';
        div.style.opacity = '0.25';
        document.body.appendChild(div);
    }
  }
}

onMouseLeave:

onLeave(event){
  const anotherClass = document.getElementsByClassName("anotherClass");
  for (let elm of anotherClass) {
    document.body.removeChild(elm)
  }
}

After looping through the querySelectorAll (to get the desired elements), I used element.getBoundingClientRect() to get the exact height, width, top, right, bottom, left of the element.. That way, the new div created will take the exact size and location of the element.

CSS didn't quite cut it because other stylesheets would override/mess the styling up.

Upvotes: 7

Roope
Roope

Reputation: 4507

If all you want is the blue transparent highlight, just add a pseudo element over the hovered element. Positioning may of course be absolute of fixed for the element as well.

.element {
  float: left;
  position: relative;
  width: 100px;
  height: 100px;
  margin: 10px;
  border: 1px solid #000;
  text-align: center;
  line-height: 100px;
}

.element:hover::after {
  position: absolute;
  display: block;
  content: '';
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: #05f;
  opacity: 0.25;
}

.tall {
  height: 200px;
}
<div class="element">Element</div>
<div class="element tall">Element</div>
<div class="element">Element</div>

Upvotes: 1

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