Svelte-easy-popover NPM

Introduction

An easy-to-use popover component for Svelte 3 with out-of-the-box functionality.

This component is very flexible, while providing a lot of out-of-the-box functionality:

Built in click, hover, and focus events to trigger showing the popover
Simple, slot-driven design of the popover. No need to call special Javascript functions. Allows you to add your own transitions and styling to the popover within the normal style-block and transition directive.
Flexible. The isOpen parameter lets you build the interaction exactly how you'd wish
Extensible. This component uses Popper underneath, and exposes the popperOptions to you.

Install

npm install svelte-easy-popover

Usage

This is an example of an easy popover with a transition, placed above the button, spaced 10px away.

<script>
    import Popover from 'svelte-easy-popover';

    let referenceElement;
</script>

<button bind:this={referenceElement}>Open popover</button>
<Popover
  triggerEvents={["hover", "focus"]}
  {referenceElement}
  placement="top"
  spaceAway={10}
>
    <div
        class="popover-contents"
        transition:fade={{ duration: 250 }}
    >
        I'm a popover!
    </div>
</Popover>

<style>
    .popover-contents {
        border: 1px solid black;
        border-radius: 4px;
        padding: 8px;
    }
</style>

View the argument documentation to view more detailed information on how to use the component, or view the examples for different ways to use it.

Popper

Underneath, this component is using Popper. Please read their documentation for more details, but in general you shouldn't require knowing anything about Popper to get started.

Listening for state changes

If you use the triggerEvents property, it's not always obvious when the popover is open or closed. If you need to modify other state when opened or closed, you can freely use the on:change event, which is dispatched. It provides a simple way to keep track of the actual popover state if so desired.

    import Popover from 'svelte-easy-popover';

    let referenceElement;
    let isPopoverOpen;
</script>

<button bind:this={referenceElement}>Popover is {isPopoverOpen ? "Opened" : "Closed"}</button>
<Popover
  triggerEvents={["hover", "focus"]}
  {referenceElement}
  placement="top"
  spaceAway={10}
  on:change={({ detail: { isOpen }}) => isPopoverOpen = isOpen}
>
    <div transition:fade={{ duration: 250 }}>
        I'm a popover!
    </div>
</Popover>