vue-element-query

VueJS mixin plugin for creating element size queries in components.

How does this library function under the hood?

This plugin uses the ResizeObserver API to observe element sizing changes. As ResizeObserver is not widely supported yet, we make use of this ponyfill to provide this API across non-supporting browsers.

How is this different than the other libraries out there?

This plugin gives each component it's own sizing queries and active breakpoint state. Other libraries use the window size to determine breakpoints. This is less powerful because each component should be able to define it's own behaviour without being aware of the components around it. And that's exactly what this plugin brings to you.

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Table of contents

• Installation
• Usage
• Example
• Contributing
• License

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Installation

Using NPM

npm install vue-element-query --save

Using Yarn

yarn add vue-element-query

VueJS

Import the plugin and register it with the current Vue instance.

import Vue from "vue";
import VueElementQuery from "vue-element-query";

Vue.use(VueElementQuery);

This will make the mixin available for use in every component you register under this Vue instance.

Usage

Basic

The breakpoint queries passed in the eq.breakpoints option will have their active state exposed on the $eq object.

Any combination of the following queries can be combined to create a breakpoint:

• minWidth
• maxWidth
• minHeight
• maxHeight

A breakpoint will only be active when all of it's queries match.

<template>
  <div>
    <h1>I'm a title that is always rendered.</h1>
    <h2 v-if="$eq.medium">Only visible when my component has a medium size.</h2>
    <h3 v-if="$eq.medium || $eq.large">Visible on either medium or large size.</h3>
    <h4 :class="{'very-tiny': $eq.small}">I get a special class when my component is small.</h4>
  </div>
</template>

<script>
export default {
  eq: {
    breakpoints: {
      small: { maxWidth: 499 },
      medium: { minWidth: 500, maxWidth: 1199 },
      large: { minWidth: 1200 },
      potato: { minHeight: 123, maxHeight: 1234 }
      ...
    }
  }
};
</script>

Watching component size changes

A listener can be set on the breakpoint states, to watch them get (de-)activated. This way you can trigger additional actions if needed on separate component sizes.

export default {
  eq: {
    breakpoints: {
      small: { maxWidth: 499 },
      medium: { minWidth: 500, maxWidth: 1199 },
      large: { minWidth: 1200 }
    }
  },
  watch: {
    "$eq.small": function(newState) {
      if (newState) console.log("small breakpoint activated");
      if (!newState) console.log("small breakpoint de-activated");
    },
    "$eq.medium": function(newState) {
      if (newState) console.log("medium breakpoint activated");
      if (!newState) console.log("medium breakpoint de-activated");
    },
    "$eq.large": function(newState) {
      if (newState) console.log("large breakpoint activated");
      if (!newState) console.log("large breakpoint de-activated");
    }
  }
};

Waiting for ready state

Since v3.1.0 of this package, an additional property $eq.ready has been added. This can be useful in cases where you want to render a fallback-component, without explicitly defining a breakpoint for it:

<template>
  <div id="app">
    <component1 v-if="$eq.medium" />
    <component2 v-else />
  </div>
</template>

If the medium sized breakpoint is supposed to be active, without an $eq.ready wrapper <component2 /> would render briefly until $eq is properly initialized, which may cause unwanted behaviour. In that case, you can wait for $eq to be properly set up:

<template>
  <div id="app">
    <template v-if="$eq.ready">
      <component1 v-if="$eq.medium" />
      <component2 v-else />
    </template>
  </div>
</template>

<script>
import Component1 from "@/components/Component1";
import Component2 from "@/components/Component2";

export default {
  name: "App",
  eq: {
    breakpoints: {
      medium: { minWidth: 500 },
    },
  },
  components: {
    Component1,
    Component2,
  },
};
</script>

Example

A small example (mainly used for development and testing purposes) can be found inside the example folder

Browser support

10+	65+	59+	52+	10+

For a complete list of browsers, check the browserlist query.

Note: other browsers than the ones listed might (and probably will) work as well. Please refrain from opening issues for functionalities that are not working in these browsers.

Contributing

Feel free to provide feedback, open issues or create pull-requests to this repository.

License

vue-element-query is MIT licensed.