VueCharge

A collection of renderless Vue 2 components that supercharges your existing components!

What are renderless components?

A renderless component is a component that doesn't render any of its own HTML. Instead it only manages state and behavior, exposing a single scoped slot that gives the parent/consumer complete control over what should actually be rendered. - Adam Wathan

If you're new to the concept of renderless components and want to learn more about it, I highly recommend reading Adam Wathan's Renderless Components in Vuejs as he does a fantastic job explaining the concept with some code examples.

TLDR: Renderless components abstracts UI state management, so you never have to write this.loading = true or this.showDialog = false again. See examples below.

Important Note

This library is currently still in alpha. There is likely to be breaking change in updates.

Features

• No dependencies
• Ensure UI logics stay within the <template> tag.

Installation

npm i vue-charge

or

yarn add vue-charge

Usage

Register globally:

import Vue from 'vue'
import VueCharge from 'vue-charge'

Vue.use(VueCharge)

or

import { VcAsync } from 'vue-charge'

export default {
    components: {
        VcAsync
    }
}

Component Documentation

VcAsync

VcAsync is a component to help you manage rendering affected asynchronous Javscript. Please note that there are 2 ways of using VcAsync, either only using default slot or using the promise states. Example below.

Props

Name	Type	Default	Description
promise	Function	required	Function that returns a Promise
default	String	'pending'	Default starting state when the component is created. With the default set to 'pending', the component will automatically execute the promise function upon mount. If you prefer to trigger the promise manually, you should set the default state to 'idle'.

Events

Name	Value
pending	undefined
resolved	response returned by resolvation of promise
rejected	error returned by the rejection of promise

Slot Scopes

Scope	Description
state	Current state of the promise. Possible values: 'idle', 'pending', 'resolved', 'rejected'
execute	Executes the promise function.
reset	Resets the state to 'idle'
response	Response returned by resolvation of promise
error	Error returned by the rejection of promise

Example 1 (Default Slot)

If the default slot is used, the other slots will not be rendered.

<template>
    <vc-async :promise="handleSubmit" default="idle">
        <template v-slot:default="{ execute, state }">
            <form @submit.prevent="execute">
                <button type="submit" :disabled="state === 'pending'">
                    Save
                </button>
            </form>
        </template>
    </vc-async>
</template>

<script>
    export default {
        methods: {
            handleSubmit() {
                return axios.post('https://...')
            }
        }
    }
</script>

Example 2 (Promise States)

<template>
    <vc-async :promise="fetchCoffee" default="idle">
        <template v-slot:idle="{ execute }">
            <button @click="execute">Show me cats!</button>
        </template>

        <template v-slot:pending>
            <div>Loading...</div>
        </template>

        <template v-slot:resolved="{ execute, response }">
            <div>
                <button @click="execute">Retry</button>

                <div v-if="response">
                    <div v-for="cat in response.data" :key="cat.id">
                        <img :src="cat.url" />
                    </div>
                </div>
            </div>
        </template>

        <template v-slot:rejected="{ error, execute }">
            <div>
                <button @click="execute">Retry</button>
                <div v-text="error.response">Rejected</div>
            </div>
        </template>
    </vc-async>
</template>

<script>
    export default {
        methods: {
            fetchCoffee() {
                return axios.get('https://example.com/cats.json')
            }
        }
    }
</script>

---

VcMultiScreen

VcMultiScreen ensures you only render 1 of few possible screens in the same DOM hierarchy. For example, a dialog that displays either a login or sign up form. This can also be used for multi-part forms.

Props

Name	Type	Default	Description
screens	Array	required	Array of screen names. E.g. ['login', 'sign-up']. Defaults to the first item in the array.

Events

Name	Value
transition	Name of the screen the component is transitioning into

Slot Scopes

Scope	Description
screen	Name of current active screen
transition	Function to transition into another screen. Requires you to pass in the screen name that you want to transition into.

Example

<template>
    <vc-multi-screen :screens="['login', 'sign-up']">
        <template v-slot:login="{ transition }">
            <button @click="transition('sign-up')">Register now</button>
        </template>

        <template v-slot:sign-up="{ transition }">
            <button @click="transition('login')">
                I already have an account
            </button>
        </template>
    </vc-multi-screen>
</template>

---

VcResetable

VcResetable provides you a key which you can update anytime to force a component re-render. For example, after submitting a Contact Us form, you may want to reset the form state. Changing the key re-creates and remount the form component in a fresh state.

Slot Scopes

Scope	Description
key	A key
reset	Function to transition into another screen. Requires you to pass in the screen name that you want to transition into.

Example

<template>
    <vc-resetable>
        <template v-slot:default="{ key, reset }">
            <contact-us-form :key="key" @submit.prevent="reset">
            </contact-us-form>
        </template>
    </vc-resetable>
</template>

Extra Note

By default all VueCharge only add functionalities to your components and does not add any wrapper HTMLElement to the DOM tree. You can imagine VueCharge components behaving like so:

<template>
    <slot></slot>
</template>

For this reason, you still have to abide by Vue's convention of only pass in 1 root node. However, if you prefer that VueCharge components be rendered as part of the DOM tree, all components come with a wrap prop, which you can use to specify your desired HTML tag.

Default

<vc-resetable>
    <div>My text</div>
</vc-resetable>

<!-- This will output -->
<div>My text</div>

<vc-resetable>
    <div>My text</div>
    <div>More text</div>
</vc-resetable>

<!-- This will result in error -->

With wrap prop

<!-- With wrap prop -->
<vc-resetable wrap="div">
    <div>My text</div>
    <div>More text</div>
</vc-resetable>

<!-- This will output -->
<div>
    <div>My text</div>
    <div>More text</div>
</div>