Category: JavaScript Answers

Sometimes, we want to change text node value with JavaScript.

In this article, we’ll look at how to change text node value with JavaScript.

How to change text node value with JavaScript?

To change text node value with JavaScript, we can set the nodeValue property.

For instance, we write

node.nodeValue = "new value";

to set the text node‘s nodeValue to a string.

Setting nodeValue will only set the value of the text node and not affect descending nodes.

Conclusion

To change text node value with JavaScript, we can set the nodeValue property.

Sometimes, we want to move all HTML element children to another parent using JavaScript.

In this article, we’ll look at how to move all HTML element children to another parent using JavaScript.

How to move all HTML element children to another parent using JavaScript?

To move all HTML element children to another parent using JavaScript, we can use the appendChild method.

For instance, we write

const setParent = (el, newParent) => {
  newParent.appendChild(el);
};

const l = document.getElementById("old-parent").childNodes.length;
const a = document.getElementById("old-parent");
const b = document.getElementById("new-parent");
for (let i = l; i >= 0; i--) {
  setParent(a.childNodes[i], b);
}

to define the setParent function to new el as a child of newParent.

Then we select the old parent and assign it to a and select the new parent and assign it to b.

Next we use a for loop to loop through a‘s childNodes and move them to b with setParent.

We loop through the childNodes backward so that the order of the child nodes left in a won’t be affected by the loop.

Conclusion

To move all HTML element children to another parent using JavaScript, we can use the appendChild method.

Sometimes, we want to get width and height of SVG element with JavaScript.

In this article, we’ll look at how to get width and height of SVG element with JavaScript.

How to get width and height of SVG element with JavaScript?

To get width and height of SVG element with JavaScript, we can use the getBoundingClientRect method.

For instance, we write

const el = document.getElementById("yourElement");
const rect = el.getBoundingClientRect();

console.log(rect.width);
console.log(rect.height);

to call getElementById to get the element.

Then we call getBoundingClientRect to return an object with the width and height of the element.

Conclusion

To get width and height of SVG element with JavaScript, we can use the getBoundingClientRect method.

Sometimes, we want to use scrollIntoView with a fixed position header with JavaScript.

In this article, we’ll look at how to use scrollIntoView with a fixed position header with JavaScript.

How to use scrollIntoView with a fixed position header with JavaScript?

To use scrollIntoView with a fixed position header with JavaScript, we can call scroll to scroll to the element at the given position.

For instance, we write

const node = document.getElementById("foo");
const yourHeight = 200;

node.scrollIntoView(true);

const scrolledY = window.scrollY;

if (scrolledY) {
  window.scroll(0, scrolledY - yourHeight);
}

to select the element we want to scroll to with getElementById.

Then we call node.scrollIntoView to scroll to the element.

Next, we call window.scrollto to scroll to scrolledY - yourHeight to scroll to the given position.

Conclusion

To use scrollIntoView with a fixed position header with JavaScript, we can call scroll to scroll to the element at the given position.

Sometimes, we want to test the type of a DOM element in JavaScript.

In this article, we’ll look at how to test the type of a DOM element in JavaScript.

How to test the type of a DOM element in JavaScript?

To test the type of a DOM element in JavaScript, we can check the nodeName property of the element.

For instance, we write

if (element.nodeName === "A") {
  //...
} else if (element.nodeName === "TD") {
  //...
}

to check if element is an a element with

element.nodeName === "A"

And we check if element is a td element with

element.nodeName === "TD"

Conclusion

To test the type of a DOM element in JavaScript, we can check the nodeName property of the element.