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Bring it on!

Resize Observer

<pc-resize-observer>

0.1.0

experimental

The Resize Observer component offers a thin, declarative interface to the ResizeObserver API.

The resize observer will report changes to the dimensions of the elements it wraps through the pc-resize event. When emitted, a collection of ResizeObserverEntry objects will be attached to event.detail that contains the target element and information about its dimensions.

<div class="resize-observer-overview">
    <pc-resize-observer>
        <span>Resize this box and watch the console ➡️</span>
    </pc-resize-observer>
</div>

<script>
    const container = document.querySelector(
        ".resize-observer-overview",
    );
    const resizeObserver =
        container.querySelector("pc-resize-observer");

    resizeObserver.addEventListener("pc-resize", (event) => {
        console.log(event.detail);
    });
</script>

<style>
    .resize-observer-overview {
        display: flex;
        align-items: center;
        justify-content: center;
        padding-block: var(--pc-spacing-xxxl);
        padding-inline: var(--pc-spacing-xxl);
        border: var(--pc-border-width-m) dashed
            var(--pc-color-neutral-border-normal);
        border-radius: var(--pc-border-radius-l);
        overflow: auto;
    }
</style>

Code

Edit

Properties#

Name	Description	Reflects	Default
`disabled`	Disables the resize observer. Type: `boolean`		`false`
`updateComplete`	A read‐only promise that resolves when the component has finished updating.		‐

Learn more about attributes and properties.

Slots#

Name	Description
(default)	One or more elements to watch for resizing.

Learn more about using slots.

Events#

Name	Description	Event detail
`pc-resize`	Emitted when the element is resized.	`{ entries: ResizeObserverEntry[] }`

Learn more about events.

Importing#

If you’re using the autoloader or the standard loader, you can skip this section. But if you’re cherry picking, you can use any of the following snippets to import this component.

CDN (script tag)

CDN (import)

npm (import)

To manually import this component from the CDN, copy this code snippet and paste it in your HTML.

<script type="module" src="https://cdn.jsdelivr.net/npm/placer-toolkit@1.0.0-alpha.1/cdn/components/resize-observer/resize-observer.js"></script>

To manually import this component from the CDN, copy this code snippet and paste it in your JavaScript file.

import "https://cdn.jsdelivr.net/npm/placer-toolkit@1.0.0-alpha.1/cdn/components/resize-observer/resize-observer.js";

To manually import this component from npm, copy this code snippet and paste it in your JavaScript file.

import "placer-toolkit/dist/components/resize-observer/resize-observer.js";