Guide to creating a versatile script that adjusts height in JavaScript

Question

Guide to creating a versatile script that adjusts height in JavaScript

If you want to adjust the height of an element using JavaScript, you can do something like this:

function changeHeight(elementId) {
    document.getElementById(elementId).style.height = "200px";
}
<button type="button" onClick="changeHeight('chartdiv');"> Click Me! </button>

However, if you have multiple elements with the same id and buttons assigned to them, clicking on one button will still affect all elements. Is there a way to create a more general method that can be applied to any element?

javascript html css web

Answer 1

Answer №1

It is crucial for IDs to be unique. Avoid having multiple elements sharing the same ID.

If you find yourself needing to modify various elements, consider passing arguments to your function:

function adjustSize(selector, size) {
    let item = document.querySelector(selector);
    if (item) {
        item.style.height = size;
    }
}

adjustSize('#chartdiv', '200px');
adjustSize('#otherElement', '500px');

Answer 2

It is crucial for IDs to be unique. Avoid having multiple elements sharing the same ID.

If you find yourself needing to modify various elements, consider passing arguments to your function:

function adjustSize(selector, size) {
    let item = document.querySelector(selector);
    if (item) {
        item.style.height = size;
    }
}

adjustSize('#chartdiv', '200px');
adjustSize('#otherElement', '500px');

Answer 3

Answer №2

Identification is crucially unique as it serves as the distinct identifier for an element. While multiple elements can bear the same class name, you have to remember this fact:

document.getElementsByClassName("class_name")[0].style.height = "200px";

The usage of document.getElementsByClassName("class_name") fetches an array containing all the elements with that specific class name in chronological order - in other words, to target the first occurrence of that class, you need to refer to the 0th element and so forth.

Remember: It's a cardinal sin to reuse an id. Don't do it!

Answer 4

Identification is crucially unique as it serves as the distinct identifier for an element. While multiple elements can bear the same class name, you have to remember this fact:

document.getElementsByClassName("class_name")[0].style.height = "200px";

The usage of document.getElementsByClassName("class_name") fetches an array containing all the elements with that specific class name in chronological order - in other words, to target the first occurrence of that class, you need to refer to the 0th element and so forth.

Remember: It's a cardinal sin to reuse an id. Don't do it!

Guide to creating a versatile script that adjusts height in JavaScript

Answer №1

Answer №2

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