Vue.js pass function as prop and make child call it with data

Normally, the click event handler will receive the event as its first argument, but you can use bind to tell the function what to use for its this and first argument(s):

:clicked="clicked.bind(null, post)

Updated answer: However, it might be more straightforward (and it is more Vue-standard) to have the child emit an event and have the parent handle it.

let Post = Vue.extend({
  template: `
      <div>
        <button @click="clicked">Click me</button>
      </div>
    `,
  methods: {
    clicked() {
      this.$emit('clicked');
    }
  }
});

let PostsFeed = Vue.extend({
  data: function() {
    return {
      posts: [1, 2, 3]
    }
  },
  template: `
      <div>
        <post v-for="post in posts" @clicked="clicked(post)" />
      </div>
    `,
  methods: {
    clicked(id) {
      alert(id);
    }
  },
  components: {
    post: Post
  }
});

new Vue({
  el: 'body',
  components: {
    'post-feed': PostsFeed
  }
});

<script src="//cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.min.js"></script>
<post-feed></post-feed>

Using Vue 2 and expanding on @Roy J's code above, I created a method in the child component (Post) that calls the prop function and sends back a data object as part of the callback. I also passed in the post as a prop and used its ID value in the callback.

Back in the Posts component (parent), I modified the clicked function by referencing the event and getting the ID property that way.

Check out the working Fiddle here

And this is the code:

let Post = Vue.extend({
  props: {
    onClicked: Function,
    post: Object
  },
  template: `
      <div>
        <button @click="clicked">Click me</button>
      </div>
    `,
  methods: {
    clicked() {
        this.onClicked({
        id: this.post.id
      });
    }
  }
});

let PostsFeed = Vue.extend({
  data: function() {
    return {
      posts: [
        {id: 1, title: 'Roadtrip', content: 'Awesome content goes here'},
        {id: 2, title: 'Cool post', content: 'Awesome content goes here'},
        {id: 3, title: 'Motorcycle', content: 'Awesome content goes here'},
      ]
    }
  },
  template: `
      <div>
        <post v-for="post in posts" :post="post" :onClicked="clicked" />
      </div>
    `,
  methods: {
    clicked(event) {
      alert(event.id);
    }
  },
  components: {
    post: Post
  }
});

new Vue({
  el: '#app',
  components: {
    'post-feed': PostsFeed
  }
});

And this is the HTML

<div id="app">
    <post-feed></post-feed>
</div>