Vue.js set data outside component

Question

I've got a component and I would like to set a data item outside the component.

How would I do this with a directive?

I was thinking about something like this:

Vue.directive('init', {
    bind: function(el, binding, vnode) {
        vnode.context[binding.arg] = binding.value;
    }
});

But it's not working:

 Vue.directive('init', { bind: function(el, binding, vnode) { vnode.context[binding.arg] = binding.value; } }); Vue.component('test', { template: '<p>{{date}}</p>', data() { return { date: "" } } }); new Vue({ el: '#app' }) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.1/vue.js"></script> <div id="app"> <test v-init:date="'2017-07-20 09:11:42'"></test> </div> 

Any Idea how I would get this to work?

--edit--

I don't want to use props for this! I've lots and lots of fields.

Answer 1

This should work.

 Vue.directive('init', { bind: function(el, binding, vnode) { let component = el.__vue__ component[binding.arg] = binding.value } }); Vue.component('test', { template: '<p>{{date}}</p>', data() { return { date: "" } } }) new Vue({ el: '#app' }) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.1/vue.js"></script> <div id="app"> <test v-init:date="'2017-07-20 09:11:42'"></test> </div> 

Answer 2

You can refer to a component's data using $data .

 Vue.directive('init', { bind: function(el, binding, vnode) { vnode.context[binding.arg] = binding.value; } }); Vue.directive('initData', { bind: function(el, binding, vnode) { vnode.context.$data[binding.arg] = binding.value; } }); new Vue({ el: '#app', data: { ciudad: '' }, components: { cityInput: { data() { return { ciudad: '' } } } } }) 

 <script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.3.4/vue.min.js"></script> <div id="app"> <input v-model="ciudad" v-init:ciudad="'Madrid'"> {{ciudad}} <city-input inline-template> <div> <input v-model="ciudad" v-init-data:ciudad="'Lisbon'"> {{ciudad}} </div> </city-input> </div> 

Answer 3

If I understood you correctly you should be using props for passing the data to your components. As a matter of fact you can use only one variable (either date or initDate), the usage is the same.

Vue.component('test', {
  template: '<p>{{date}}</p>',
  props:['initDate'],
  data() {
    return {
            date: ""
    }
  }
});

new Vue({
  el: '#app'
});

And then in html you use it like this:

<div id="app">
  <test :initDate="2017-07-20 09:11:42"></test>
</div>