vue-lever

What's Lever?

Lever is a very important block in minecraft. It only has two state, one is true(emit energy), the other is false. I love lever, it's simple, but powerful.

What it can do

In vue, how to manage true/false variable is a troublesome thing.

here is a example. Sometimes, you need to maintain a loading state. Set true for it when function called and set false for it when async action done or wrong. The code looks like:

new Vue({
    data() {
        return { loading: false }
    }
    methods: {
        asyncAction() {
            this.loading = true
            this.$http.doing() // return a promise
                .then(() => this.loading = false)
                .catch(() => this.loading = false))
        }
    }
})

You have to change state manually. I think it so troublesome. So I write vue-lever to manage this state.

Usage

Install

# npm < 5
npm install vue-lever -S
# npm > 5
npm install vue-lever
# or
yarn add vue-lever

Prepare

// use as a plugin
import Lever from 'vue-lever'
import Vue from 'vue'

Vue.use(Lever)

How to use

Decorator

It's very simple, use it as Decorator, for example

import Lever from 'vue-lever'
// import others

new Vue({
    methods: {
        @Lever.Lever('loading')
        asyncAction() {
            return this.$http.doing() // return a promise
        }
    }
})

all variable would store in this.levers

such as this.levers.loading, you can use levers.loading in template to replace loading

Remember: function is better to return a promise, if function don't return promise, the loading would been set true and immediate been set false again.

And Lever decorator only add state manage in function. This means whatever origin function return, the decorated function would return as same as origin function.

If you want to use Decorator, please make sure you enabled babel transform of decorator.

Manually

If you don't like Decorator or you want to more flexible control. You can use this.$lever function to control variable manually

// new Vue... {
    asyncAction() {
        this.$lever('loading', true) // or this.$lever.t('loading')
        // do something
        this.$lever('loading', false) // or this.$lever.f('loading')
    }
// }

And there have this.$lever.t and this.$lever.f as a alias for this.$lever

Global Option

No Global option

Instance Option

You can pass levers which type is Object to vue constructor for init variable

const vm = new Vue({
    levers: {
        loading: true,
        used: false,
    }
})
// assert.true(vm.levers.loading)
// assert.false(vm.levers.used)
 
// Instance API
$lever: {
    (name: String, value: Boolean) => void
    enabled: (name: String) => void
    t: (name: String) => void
    disable: (name: String) => void
    f: (name: String) => void
}

And levers also can be a array with string, all default false

Thank you

If you have any question or suggestion, please new issues.