VueJS 将属性绑定到 App.vue 中的组件

Question

I am using VueJS via VUE CLI and have a component called Icon.vue. This component has a variable which should be set by the App.vue file. How can i achieve this?

This is my App.vue file:

<template>
  <div id="app">
    <Icon iconUrl="../assets/img/plant-icon-1.svg" iconAlt="Blume"/>
  </div>
</template>

<script>
  import Icon from './components/Icon.vue'

  export default {
    name: 'app',
    components: {
      Icon
    }
  }
</script>

and there's my Icon.vue file:

<template>
  <div class="container iconBar">
    <div class="row">
      <div class="col text-center py-5">
        <img :src="{ iconUrl }" :alt="{ iconAlt }">
      </div>
    </div>
  </div>
</template>

What am i missing? Nothing is generated in the frontend. It's just empty.

---

UPDATE

As suggested i edited my Icon.vue like this. But still NO output. In the frontend i get an empty image and an [object Object] output in the alt-Tag

<template>
  <div class="container iconBar">
    <div class="row">
      <div class="col text-center py-5">
        <img :src="{ iconUrl }" :alt="{ iconAlt }">
      </div>
    </div>
  </div>
</template>

<script>
  export default {
    props: {
      iconUrl: {
        type: String,
        required: true
      },
      iconAlt: {
        type: String,
        required: true
      }
    }
  }
</script>

---

UPDATE 2

Now it works. The fault was that i called an object and not the string. Therefore you have to write

        <img :src="iconUrl" :alt="iconAlt">

instead of

        <img :src="{ iconUrl }" :alt="{ iconAlt }">

Thanks everyone!

Answer 1

Add a prop to the Icon component, like so:

<template>
  <div class="container iconBar">
    <div class="row">
      <div class="col text-center py-5">
        <img :src="iconUrl" :alt="iconAlt">
      </div>
    </div>
  </div>
</template>

<script>
export default {
  props: ['iconUrl', 'iconAlt']
}
</script>

take a look at the documentation: https://v2.vuejs.org/v2/guide/components-props.html

You could also add validation to it to ensure it's supplied and is a string:

<script>
export default {
  props: {
    iconUrl: {
      type: String,
      required: true
    }
  }
}
</script>

Answer 2

In your Icon.vue file, add your props.

<template>
  <div class="container iconBar">
    <div class="row">
      <div class="col text-center py-5">
        <img :src="{ iconUrl }" :alt="{ iconAlt }">
      </div>
    </div>
  </div>
</template>

<script>
    export default {
        props: ['iconUrl', 'iconAlt'],
    }
</script>

Answer 3

Consider not using camelcase convention to call props in your component instead use kebab-case like this:

 Vue.component('icon-component', { props: ['iconName', 'iconAlt'], data () { return { iconUrl: '../assets/img/' + this.iconName + '.svg' } }, template: ` <div class="container iconBar"> <div class="row"> <div class="col text-center py-5"> <img :src="iconUrl" :alt="iconAlt"> <p>icon url path: {{ iconUrl }}</p> </div> </div> </div> `, }) new Vue({ el: "#app" })

 <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script> <div id="app"> <icon-component icon-name="plant-icon-1" icon-alt="Blume" /> </div>