<template>
  <div>
    <a v-if="isPartA">partA</a>
    <a v-else>no data</a>
    <button v-on:click="toggle">toggle</button>
    <input @keydown.enter="onkeydown">
  </div>
</template>

<script>
  export default {
    data () {
      return {
        isPartA: true
      }
    },
    methods: {
      toggle () {
        this.isPartA = !this.isPartA
      },
      onkeydown () {
        console.log(‘on key down‘)
      }
    }
  }
</script>

<style>
  html {
    height: 100%;
  }
</style>

<template>
  <div>
    {{ hello }}
    <button @click="emitMyEvent">emit</button>
  </div>
</template>

<script>
  export default {
    data () {
      return {
        hello: ‘i am component hello‘
      }
    },
    methods: {
      emitMyEvent () {
        this.$emit(‘my-event‘, this.hello)
      }
    }
  }
</script>

<style scoped>/**/
h1 {
  height: 100px;
}
</style>

<template>
  <div>
    <a v-if="isPartA">partA</a>
    <a v-else>no data</a>
    <button v-on:click="toggle">toggle</button>
    <input @keydown.enter="onkeydown">
    <comH @my-event="onComhMyEvent"></comH>
  </div>
</template>

<script>
  import comH from ‘./components/hello.vue‘
  export default {
    components: {
      comH
    },
    data () {
      return {
        isPartA: true
      }
    },
    methods: {
      toggle () {
        this.isPartA = !this.isPartA
      },
      onkeydown () {
        console.log(‘on key down‘)
      },
      onComhMyEvent (parmformA) {
        console.log(‘onComhMyEvent‘ + parmformA)
      }
    }
  }
</script>

<style>
  html {
    height: 100%;
  }
</style>