@morev/equal-heights

JavaScript plugin to make elements the same height across different containers.
In fact, this is a crutch, but it's necessary until we get CSS Subgrid ready.

If you can use CSS Subgrid - use it.
This plugin tries to do literally the same, but, of course, is less performant than browsers can do.

Plugin is written in pure JavaScript, so it can be called "framework agnostic".
There is already a version for Vue 2 and 3 done via directives.

Table of contents

• Installation
  • Using yarn
  • Using npm
  • Using pnpm
• Usage
• Options
• Methods
• Vue module
  • Global registration
  • Local registration
  • Example

Installation

Using yarn

yarn add @morev/equal-heights

Using npm

npm install @morev/equal-heights

Using pnpm

pnpm add @morev/equal-heights

Usage

import { EqualHeights } from '@morev/equal-heights';

const equalHeights = new EqualHeights({
  /* custom options for all groups of elements (optional) */
});

equalHeights.add([
  { selector: '.some-selector', options: { /* custom options for this group of elements (optional) */ } },
  { selector: '.another-selector' },
]);

Options

byRows

Whether only the elements in the same row should have equal height, instead of all the elements in stack.

// Default: true
export type OptionByRows = boolean;

isEnabled

A function to test whether the elements should have the equal height. Accepts the window object as the argument.
Returns a value that coerces to true to set equal height, or to false otherwise.

// Default: () => true
export type OptionIsEnabled = (window: Window) => boolean;

isDisabled

A function to test whether the elements should not have the equal height. Accepts the window object as the argument.
Returns a value that coerces to true to unset equal height, or to false otherwise.

// Default: () => false
export type OptionIsDisabled = (window: Window) => boolean;

resizeObserver

Whether to observe resizing of the elements using the ResizeObserver.

// Default: true
export type OptionResizeObserver = boolean;

mutationObserver

Whether to observe adding/removing of the elements using the MutationObserver.

// Default: true
export type OptionMutationObserver = boolean;

parent

Common parent element of a given elements.

// Default: document.body
export type OptionMutationObserver = HTMLElement;

Methods

add

Adds a new group(s) of elements and (optionally) its specific options.

Parameters:

Name	Type	Description
input*	string|string[]|object|object[]	Elements selector, an object structured of { selector: string, options?: object }, or an array of such objects.

Returns:

EqualHeights - The class instance.

Example:

import { EqualHeights } from '@morev/equal-heights';

const equalHeights = new EqualHeights();

equalHeights.add('.selector-one');
equalHeights.add({ selector: '.selector-two', options: { /* custom options (optional) */ } });
equalHeights.add([
  { selector: '.selector-three', options: { /* custom options (optional) */ } },
  { selector: '.selector-four' },
]);

remove

Removes the elements from the stack.

Parameters:

Name	Type	Description
selector*	string	Selector of the elements being de-registered.
parent	HTMLElement|undefined	Common parent element.

Returns:

EqualHeights - The class instance.

Example:

import { EqualHeights } from '@morev/equal-heights';

const equalHeights = new EqualHeights();

equalHeights.add([
  { selector: '.some-selector', options: { parent: document.querySelector('.parent-selector') } },
  { selector: '.another-selector' },
]);

// ...

equalHeights.remove('.some-selector', document.querySelector('.parent-selector'));
// only the `.another-selector` elements are being processed now

update

Returns:

EqualHeights - The class instance.

Example:

import { EqualHeights } from '@morev/equal-heights';

const equalHeights = new EqualHeights();

equalHeights.add([
  { selector: '.some-selector' },
  { selector: '.another-selector' },
]);

// ...

equalHeights.update(); // manually update all the registered elements sizes

reset

Restores the initial state of all the registered elements and removes it from the stack.

Returns:

EqualHeights - The class instance.

Example:

import { EqualHeights } from '@morev/equal-heights';

const equalHeights = new EqualHeights();

equalHeights.add([
  { selector: '.some-selector' },
  { selector: '.another-selector' },
]);

// ...

equalHeights.reset(); // there are no elements being processed now

Vue module

The Vue module (2 and 3 both) distributes in the same package and avaliable via a named export called /vue.

In fact, there are three exports: /vue, /vue2 and /vue3, and main /vue export is dynamical - it mapped to version of Vue used in your project.

Underhood, it utilized the postinstall npm hook.
After installing the package, the script will start to check the installed Vue version and redirect the exports to based on the local Vue version.
If no Vue installation is found, the script will install the version for Vue 3 as default.

It feels pretty robust, but if you're worried about, prefer an explicit named import according to the version you're using.

There are also CLI to switch mapping of main export:
yarn equal-heights-vue-version <version>, where <version> is "2" of "3"

😥 I got an error "This dependency was not found"

For environments that can't resolve exports field (such as Nuxt 2) just replace import with direct path to file:

import { plugin as EqualHeights } from '@morev/equal-heights/dist/vue.cjs';

Global registration

Vue 2

import Vue from 'vue';
import { plugin as EqualHeights } from '@morev/equal-heights/vue';

Vue.use(EqualHeights);

Vue 3

import { createApp } from 'vue';
import { plugin as EqualHeights } from '@morev/equal-heights/vue';

const app = createApp(App);
app.use(EqualHeights);

Local registration

<template>
  <ul class="list" v-equal-heights="'.item-title'">
    // ...
  </ul>
</template>

<script>
  import { directive as equalHeights } from '@morev/equal-heights/vue';

  export default {
    name: 'some-component',
    directives: { equalHeights },
    // ...
  }
</script>

---

Examples

Single selector

<template>
  <ul v-equal-heights="'.item-tags'">
    <li v-for="item in items" :key="item.id">
      <div class="item-tags">...</div>
      <img class="item-image" src="..." alt="Product image" />
      <div class="item-title">...</div>
    </li>
  </ul>
</template>

---

Multiple selectors

<template>
  <ul v-equal-heights="['.item-tags', '.item-title']">
    <li v-for="item in items" :key="item.id">
      <div class="item-tags">...</div>
      <img class="item-image" src="..." alt="Product image" />
      <div class="item-title">...</div>
    </li>
  </ul>
</template>

---

Custom options

<template>
  <ul
    v-equal-heights="{
      selector: '.item-tags', // May also be an array of strings
      options: {
        isEnabled: (window) => window.innerWidth >= 768,
      }
    }"
  >
    <li v-for="item in items" :key="item.id">
      <div class="item-tags">...</div>
      <img class="item-image" src="..." alt="Product image" />
      <div class="item-title">...</div>
    </li>
  </ul>
</template>

---

Multiple groups with custom options

<template>
  <ul
    v-equal-heights="[
      {
        selector: '.item-tags', // May also be an array of strings
        options: {
          isEnabled: (window) => window.innerWidth >= 768,
        }
      },
      {
        selector: '.item-title', // May also be an array of strings
        options: {
          isEnabled: (window) => isAligned && window.innerWidth >= 360,
        }
      }
    ]"
  >
    <li v-for="item in items" :key="item.id">
      <div class="item-tags">...</div>
      <img class="item-image" src="..." alt="Product image" />
      <div class="item-title">...</div>
    </li>
  </ul>
</template>