In this scenario, my div is intersecting the bottom of the page. How can I use JavaScript to determine if this element is intersecting with it or not?
For example, if bottom:0px; should not be intersected.
.fixed{
position:fixed;
bottom:-10px;
left:0px;
width:300px;
height:300px;
background:blue;
border:3px solid red;
}<div class="fixed"></div>To determine if an element intersects the screen, you can utilize the getBoundingClientRect() function which provides information on the size and position of the element in relation to the viewport.
By comparing this data to window.innerHeight, you can ascertain whether the element is within view or not.
var elmBottom = document.querySelector(".fixed").getBoundingClientRect().bottom;
if(elmBottom > window.innerHeight) console.log("The element intersects the bottom of the screen");
else console.log("The element is still fully visible");.fixed{
position:fixed;
bottom:-10px;
left:0px;
width:300px;
height:300px;
background:blue;
border:3px solid red;
}<div class="fixed"></div>After consulting a guide, I found code that determines if an element is within the viewport.
The script functions by comparing the element's position, obtained through getBoundingClientRect(), with the viewport's height calculated using documentElement.clientHeight.
In this scenario, to check only if the lower edge overlaps, adjustments were made to evaluate solely domRect.bottom.
This approach categorizes bottom: 0px; as overlapping and bottom: 1px; as non-overlapping. To classify bottom:0px; as overlapping, increment documentElement.clientHeight by 1.
function isIntersectingBottom(ele) {
const domRect = ele.getBoundingClientRect();
console.log(domRect.bottom);
console.log(document.documentElement.clientHeight);
return (
domRect.bottom >= document.documentElement.clientHeight + 1
);
}
const ele = document.querySelector('.fixed');
console.log(isIntersectingBottom(ele));.fixed{
position: fixed;
bottom: -10px;
left: 0px;
width: 300px;
height: 300px;
background: blue;
border: 3px solid red;
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