Vue js. Recursive component ruins my life

Question

I wanted to create a tree view from an XML file, and I did this. However, when I decided to make it more flexible I encountered some problems.

Here are my components:

Vue.component('elname', {
  props: ['text'],
  template: '<span>{{ text }}</span>'
})


Vue.component('recursive', {
  props: ['d', 'liname', 'openclose'],
  template: '#recursive',
  data: function() {
    return {
      seen: true
    }
  }
  }
)

and the Vue object looks like this:

var appp = new Vue({
  el: '#here',
  data: function(){
    return {
      friends: '',
    }
  },
  beforeMount() {
    parser = new DOMParser();
    var response = "<scope><friend><name>Alex</name><hobbies><h>music</h><h>salsa</h></hobbies></friend><friend><name>Natasha</name><hobbies><h>hiking</h></hobbies></friend></scope>";
    xml = parser.parseFromString(response, 'text/xml');
    children = xml.getElementsByTagName('scope')[0];
    this.friends = children;
  }
})

I have this variable seen in recursive component

Vue.component('recursive', {
  props: ['d', 'liname', 'openclose'],
  template: '#recursive',
  data: function() {
    return {
      seen: true // <-- here it is
    }
  }
  }
)

It must change its value @click event to hide a nested list (please, see the JSfiddle), but when it changes it updates its value IN SEVERAL components.

How to make its value be updated only in a particular component?

Here is a template:

<div id="here">
  <recursive :d="friends" openclose="[-]"></recursive>
</div>

<template id="recursive">
  <div>
    <ul v-if="d.children.length != 0">
      <li v-for="n in d.childNodes" @click="seen = !seen">
        <elname :text="n.tagName"></elname>
        {{ openclose }}
        {{seen}} <!-- it is just for testing purposes to illustrate how seen var changes -->
        <recursive :d="n" openclose="[-]"></recursive>
      </li>
    </ul>
    <ul v-else>
      <elname :text="d.textContent"></elname>
    </ul>
  </div>
</template>

Answer 1

You have two issues:

1. You need to use click.stop so that the click event doesn't propagate to parents
2. You need a component inside your recursive to handle the toggling

Vue.component('elname', {
  props: ['text'],
  template: '<span>{{ text }}</span>'
});

Vue.component('recursive', {
  props: ['d', 'openclose'],
  template: '#recursive',
  components: {
    toggler: {
      data() {
        return {
          seen: true
        }
      },
      methods: {
        toggle() {
          this.seen = !this.seen;
        }
      }
    }
  }
});

var appp = new Vue({
  el: '#here',
  data: function() {
    return {
      friends: '',
    }
  },
  beforeMount() {
    parser = new DOMParser();
    var response = "<scope><friend><name>Alex</name><hobbies><h>music</h><h>salsa</h></hobbies></friend><friend><name>Natasha</name><hobbies><h>hiking</h></hobbies></friend></scope>";
    xml = parser.parseFromString(response, 'text/xml');
    children = xml.getElementsByTagName('scope')[0];
    this.friends = children;
  }
})

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.4/vue.min.js" integrity="sha256-Ab5a6BPGk8Sg3mpdlsHzH6khPkniIWsvEuz8Fv/s9X8=" crossorigin="anonymous"></script>

<div id="here">
  <recursive :d="friends" openclose="[-]"></recursive>
</div>

<template id="recursive">
  <div>
    <ul v-if="d.children.length != 0">
      <li is="toggler" v-for="n in d.childNodes" inline-template>
        <div @click.stop="toggle">
          <elname :text="n.tagName"></elname>
          {{ openclose }}
          <recursive v-if="seen" :d="n" openclose="[-]"></recursive>
        </div>
      </li>
    </ul>
    <ul v-else>
      <elname :text="d.textContent"></elname>
    </ul>
  </div>
</template>