Pass data to vue component

Question

i'm learning Vue.js right now, but i have a little problem on understanding a quite easy task ( maybe my idea of programming is too old ).
i've created a little component with this code.

<template>
    <div class="tabSelectorRoot">
        <ul>
            <li v-for="(element,index) in elements" v-on:click="changeSelected(index)">
                <a :class="{ 'selected': activeIndex === index }" :data-value="element.value"> {{ element.text }}</a>
            </li>
        </ul>
        <div class="indicator"></div>
    </div>
</template>

<script>
    export default {
        name: "TabSelectorComponent",
        data () {
            return {
                activeIndex : 0,
                elements: [
                    { 'text':'Images', 'value': 'immagini','selected':true},
                    { 'text':'WallArts', 'value': 'wallart'}
                ]
            }
        },
        created: function () {
        },
        methods: {
            'changeSelected' : function( index,evt) {
                if ( index == this.activeIndex) { return; }
                this.activeIndex = index;
                document.querySelector('.indicator').style.left= 90 * index +'px';
                this.$emit('tabSelector:nameChanged',)
            }
        }
    }
</script>

and this is the root

<template>
  <div id="app">
    <tab-selector-component></tab-selector-component>
  </div>
</template>

<script>
import TabSelectorComponent from "./TabSelectorComponent";
export default {
    name: 'app',
    components: {TabSelectorComponent},
    data () {
        return {
            msg: 'Welcome to Your Vue.js App'
        }
    },
    'mounted' : function() {
        console.log(this)
        //EventManager.eventify(this,window.eventManager);
        /*this.register('tabSelector:changeValue',function(el){
            console.log(el);
        });*/
    }
}
</script>

All of this renders in something like this

I'd like to reuse the component by varying the number of objects inside the list but i cannot understand how to accomplish this simple task

Pass in the elements array as a prop of the TabSelectorComponent. vuejs.org/v2/guide/components-props.html — Bert
– Bert, Commented Oct 25, 2018 at 12:51
@Bert you are right, thanks. Can you reply to the question instead of comment it so i can mark as accepted ? — Tiziano
– Tiziano, Commented Oct 25, 2018 at 13:32

tony19 · Accepted Answer · 2022-07-16 00:29:44Z

1

The basic way to communicate between components in Vue is using properties and events. In your case, what you would want to do is add an elements property to your TabSelectorComponent that is set by the parent.

TabSelectorComponent

export default {
  name: "TabSelectorComponent",
  props: ["elements"],
  data () {
    return {
      activeIndex : 0
    }
  },
  ...
}

In your parent:

<tab-selector-component :elements="elementArray"></tab-selector-component>

This is covered in the documentation here.

edited Jul 16, 2022 at 0:29

tony19

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answered Oct 25, 2018 at 13:40

Bert

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1 Comment

a--m Over a year ago

I've added to data just to be clear that the array is no longer needed there. Please review if it matches your intentions.

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