How get height top a element in javascript năm 2024

Question

The Element.getBoundingClientRect() method returns a`DOMRect` object providing information about the size of an element and its position relative to the viewport.

Nội dung chính Show

How to get the top value of an element in JavaScript?
How do you calculate top height?
How to get actual element height in js?
How to get visible height in JavaScript?

None.

The returned value is a DOMRect object which is the smallest rectangle which contains the entire element, including its padding and border-width. The`left`, top,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

0,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

1,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

2,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

3,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4, and

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 properties describe the position and size of the overall rectangle in pixels. Properties other than

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4 and

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 are relative to the top-left of the viewport.

The

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4 and

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 properties of the DOMRect object returned by the method include the

<div id="example"></div>
<div id="controls"></div>

1 and

<div id="example"></div>
<div id="controls"></div>

2, not only the content width/height. In the standard box model, this would be equal to the

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4 or

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 property of the element +

<div id="example"></div>
<div id="controls"></div>

1 +

<div id="example"></div>
<div id="controls"></div>

2. But if

<div id="example"></div>
<div id="controls"></div>

7 is set for the element this would be directly equal to its

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4 or

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5.

The returned value can be thought of as the union of the rectangles returned by

div
# example {
  width: 400px;
  height: 200px;
  padding: 20px;
  margin: 50px auto;
  background: purple;
}
body {
  padding-bottom: 1000px;
}
p {
  margin: 0;
}

0 for the element, i.e., the CSS border-boxes associated with the element.

Empty border-boxes are completely ignored. If all the element's border-boxes are empty, then a rectangle is returned with a

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4 and

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 of zero and where the top and left are the top-left of the border-box for the first CSS box (in content order) for the element.

The amount of scrolling that has been done of the viewport area (or any other scrollable element) is taken into account when computing the bounding rectangle. This means that the rectangle's boundary edges (top,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

0,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

1, left) change their values every time the scrolling position changes (because their values are relative to the viewport and not absolute).

If you need the bounding rectangle relative to the top-left corner of the document, just add the current scrolling position to the top and left properties (these can be obtained using

function update() {
  const container = document.getElementById("controls");
  const elem = document.getElementById("example");
  const rect = elem.getBoundingClientRect();
  container.innerHTML = "";
  for (const key in rect) {
    if (typeof rect[key] !== "function") {
      let para = document.createElement("p");
      para.textContent = `${key} : ${rect[key]}`;
      container.appendChild(para);
    }
  }
}
document.addEventListener("scroll", update);
update();

1 and

function update() {
  const container = document.getElementById("controls");
  const elem = document.getElementById("example");
  const rect = elem.getBoundingClientRect();
  container.innerHTML = "";
  for (const key in rect) {
    if (typeof rect[key] !== "function") {
      let para = document.createElement("p");
      para.textContent = `${key} : ${rect[key]}`;
      container.appendChild(para);
    }
  }
}
document.addEventListener("scroll", update);
update();

to get a bounding rectangle which is independent from the current scrolling position.

This simple example retrieves the DOMRect object representing the bounding client rect of a simple

function update() {
  const container = document.getElementById("controls");
  const elem = document.getElementById("example");
  const rect = elem.getBoundingClientRect();
  container.innerHTML = "";
  for (const key in rect) {
    if (typeof rect[key] !== "function") {
      let para = document.createElement("p");
      para.textContent = `${key} : ${rect[key]}`;
      container.appendChild(para);
    }
  }
}
document.addEventListener("scroll", update);
update();

4 element, and prints out its properties below it.

div {
  width: 400px;
  height: 200px;
  padding: 20px;
  margin: 50px auto;
  background: purple;
}

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

Notice how the

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4/

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 are equal to its

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

4/

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

5 +

<div id="example"></div>
<div id="controls"></div>

1.

Also note how the values of

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

2/left,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

3/top,

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

0, and

let elem = document.querySelector("div");
let rect = elem.getBoundingClientRect();
for (const key in rect) {
  if (typeof rect[key] !== "function") {
    let para = document.createElement("p");
    para.textContent = `${key} : ${rect[key]}`;
    document.body.appendChild(para);
  }
}

1 are equal to the absolute distance from the relevant edge of the viewport to that side of the element, in each case.

How to get the top value of an element in JavaScript?

Using the Style top Property We can set or return the top position of an element using the JavaScript DOM style top property.

How do you calculate top height?

Example of Calculating Maximum Height Using Method A A projectile is launched with a velocity of 10 meters per second at an angle of thirty degrees above the horizontal. Calculate the maximum height of the projectile. Step 2: Use the equation h = v 0 y 2 2 g to calculate the maximum height of the projectile.