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æternity æpp Components

Overview

The æternity æpp components are meant to provide æpp developers with reusable Vue.js components that adhere to our styleguide.

The github repository is here.

Note: this repository is currently in active development and things might break / change in the future but we will be adhering to the Semantic Versioning.

Documentation

Full documentation can be found at components.aepps.com

Installation & Usage

Install the æternity æpp components via npm

npm install @aeternity/aepp-components

Import the æternity æpp components and Vue.js (for vue-cli this happens in /main.js:

import Vue from 'vue'
import Components, { AeButton } from '@aeternity/aepp-components'

Method 1: global registration of all components

Vue.use(Components)

Method 2: global registration of single components

Vue.use(Components.AeButton)

// or
Vue.component('ae-button', AeButton)

Method 3: local registration of single components

new Vue({
  components: {
    AeButton
  }
})

Global registration (Method 1 & 2) will make the æternity æpp components available throughout your app, local registration (Method 3) will have to be declared in each relevant section of your app.

Here's an example of a component usage:

<template>
  <div id="app">
    <ae-button @click="buttonPress()">My Button</ae-button>
  </div>
</template>

There's also a helper mixin / directives and filters available for handy utilities.

Mixins

import { mixins } from '@aeternity/aepp-components'

export default {
  /* … */
  mixins: [mixins.events],
}

Directives

import { directives } from '@aeternity/aepp-components'

export default {
  /* … */
  directives: { removeSpacesOnCopy: directives.removeSpacesOnCopy },
}

Filters

import { filters } from '@aeternity/aepp-components'

export default {
  /* … */
  mixins: [filters.example],
}

Contributing

Contributions to the collection are welcome! If you wrote a cool component that adheres to our style guide and you think someone else could reuse it please fork this project and send us a pull request 💪 (Please note: This guide is as much for us as for you)

Things to Keep in Mind for Submissions

• Could your component be useful to others? Ask yourself if it isn't too specific and narrow to your own use case.
• Check out the styleguide! Keeping the components in sync visually will make for a more unified æpp user experience.
• Follow Vue.js's Tips & Best Practices. Especially so that all states are handled via props, logic is kept to a minimum & communication takes place via events
• Give it a descriptive name with "ae" as a prefix (ie. aeAddressInput)

New Component Submission Guidlines

Component Purpose

The purpose of the component should be as wide as possible. Avoid to make components that only work in a specific context. Sure, sometimes you can not avoid that a <ae-menu-entry> needs to be used inside of a <ae-menu>. Pause for a thought and ask yourself, if the component could be refactored to be of more use in different contexts. Think about, if the component is not too specific to your application? Does it need a new name maybe? Can it be split into multiple components? Or is it actually just a variant of a existing one?

Component Name

Name it after what users will see, not what it represent in your application.

good example

<ae-label>Category 1</ae-label>

bad example

<ae-category>Category 1</ae-category>

Some developer might want to use the same visual element to display tags or online statuses. So she would end up writing <ae-category>Label 1</ae-category> or <ae-category>Offline</ae-category>🤦🏻‍♀️

Component file name and location

Put the files in a kebab-case directory inside src/components like src/components/ae-component-name/. Create a .vue file with the same name (ie. ae-component-name.vue) that includes template, script and style. Please bundle the scss and javascript code within the component file a single vue component. Tests can go in an external file named ae-components.test.js.

aepp-components
└── src
    └── components
        └── ae-component-name
            ├── ae-component-name.md
            ├── ae-component-name.test.js
            └── ae-component-name.vue

Component name property

Give the component a name property

export default {
  name: 'ae-component-name',
  props: {
    /* … */
  }
  /* … */
}

Component complexity

Components should be simple, function and isolated from other components. Make them focus on a few simple things. Provide reasonable defaults that make use of simple functionality. Expand complex features with props.

Try to avoid complex props objects, rather split your data into multiple props.

Components should also not be too simple. No one needs a <ae-paragraph> if it doesn't provide more value than a simple <p>.

Component dependency

Your component should be as dumb as possible. Complex data should always be passed via prop. Don't assume there will be a router or store.

Every developer wants to be in charge of his own data and state management, let them!

Don't rely on external resources (CDN content or APIs).

Components that rely on external resources can not be used offline or in a local intranet. Developers also cannot choose if and when an application 'goes online' and exposes data.

Sometimes there might be a good reason for exceptions. If you provide a component that has to be tightly coupled to an API because of the intrinsic nature of the component, it might be ok. But first ask yourself if it's possible to use the component with any external data source via prop.

Component composability

Reuse other components inside your component. Design yours, so that other components can reuse it and create richer compositions.

e.g:

good example

<template>
  <div class="ae-banner" :class="cssClass">
    <content>
      <!-- @slot Banner content -->
      <slot />
    </content>
    <!-- @slot Banner button -->
    <slot name="button">
      <ae-button :type="type" invert  @click="close" >
        <ae-icon slot="icon" :type="type" name="close"/>
      </ae-button>
    </slot>
  </div>
</template>

ae-banner is using a composition of aeButton and aeIcon to represent a close-button.

Component colors

Use colors from @import "src/styles/variables/"; folder. æternity is moving fast and the CI is being updated regularly. All components should use the same colors. 🤡

Component margins

The wrapping main element of a component must not have margin or any kind or other properties that control position/offset relative to a parent element or component. Otherwise it will be painful to position your component in other apps.

If you'd adjust the margin later, it would probably break layouts in other applications as developers position relative to your margins. 😱

Component css-classes

Give the wrapping main element a classname that corresponds to the component name ae-progress-indicator -> .ae-progress-indicator,

Add all modifier classes (that represent type, state or similar things) of the component to the main wrapping element. Modifiers should start with an underscore _ Defaults should always be included.

good example

<template>
  <div class="ae-progress-indicator _size_large _type_round _in-progress_true">
    <div class="progress-icon"></div>
    <div class="progress-label">{{ label }}</div>
  </div>
</template>

<style lang="scss">
.ae-progress-indicator {
  /* … */
  .progress-icon { /* … */ }
  .progress-label { /* … */ }
}
.ae-progress-indicator._in-progress_true { /* … */ }
.ae-progress-indicator._in-progress_false { /* … */ }

.ae-progress-indicator._size_large {
  .progress-icon { /* … */ }
  .progress-label { /* … */ }
}
.ae-progress-indicator._type_round {
  .progress-icon { /* … */ }
  .progress-label { /* … */ }
}
</style>

bad example

<template>
  <div class='ae-progress-indicator'>
    <div class='progress-icon round'></div>
    <div class='progress-label size-large'>{{ label }}</div>
  </div>
</template>

<style>
/* does red mean `in-progress`?, not clear */
.ae-progress-indicator {
  background-color: red;
}

/* bad class naming, */
.ae-progress-indicator.not-in-progress {
  // overwriting 'default' (in progress) style
  background-color: blue;
}

/* not clear whether `round` is a type or state.
parent components can not query type of .ae-progress-indicator (e.g. `.xyz > .ae-progress-indicator.type_round { … }`) */
.ae-progress-indicator .progress-icon.round {
  /* … */
}
</style>

Component using Child components

Don't interfere with the styling of internals of child components. Better pass props to children and expand functionality in these components directly. Your component will be less prone to break on changes in the children. Maintainers can see the intention isolated in the component.

bad example

.ae-my-component .ae-button .ae-icon svg {
  fill: green;
}

You don't know if the tagname or classname of a internal property in a component will change in the future. Maintainers also have no means to find out if somebody is relying on a specific tag/class.

Add Documentation

• We use Vue Styleguidist to generate documentation from well formatted and commented code.
• Their usage documentation can be found here
• Documentation begins within a markdown file with the same name as the component (ie. aeComponentName.md)
• Props should be described as thoroughly as possible, define the type and provide useful default values
• Make that markdown file include a usage example like seen here
• You can test the documentation by running npm run styleguide

How to use components in your æpp: Examples

Below is example code.

main.js

import Vue from 'vue'
import App from './App.vue'
import Components from '@aeternity/aepp-components'

Vue.use(Components)

new Vue({
  el: '#app',
  render: h => h(App)
})

App.vue

<template>
  <ae-main id="app">
    <!-- add components here -->
  </ae-main>
</template>

<script>
import { AeMain, mixins } from '@aeternity/aepp-components'

export default {
  name: 'app',
  mixins: [mixins.events], 
  components: {
    AeMain
  },
  data () {
    return {
      showModal: false,
      identity: {
        balance: '1337210000000000000', // wei as string, int or BN
        address: '0x1234567890987654321'
      }
    }
  },
 
  methods: {
    buttonPress (what) {
      console.log("button pressed", what)
    }
  }
}
</script>

<style>
  div.example {
    margin-bottom: 40px;
  }
</style>

Further documentation on the components can be found at our style guide page.