Unable to retrieve a state property within a Vue template

Embarking on my Vue journey, I've been immersing myself in online videos to grasp the essence of this framework. One intriguing observation that has piqued my curiosity is the difference in behavior when I switch from a template to a render function inside the Counter object.

I'm left wondering - why exactly does this alteration have such an impact?

-----Excerpt from HTML----

<div id="app">
  <counter></counter>
  <counter></counter>
  <counter></counter>
  <button @click="inc">increment</button>
</div>

------Within the Script Tag------

const state = new Vue({
 data: {
    count: 0
 },
  methods: {
    inc() {
        this.count++;
    }
  }
});

const Counter = {
    template: `<div>{{state.count}}</div>`
}

new Vue({
  el: '#app',
  components: {
    Counter
  },
  methods: {
    inc() {
        state.inc();
    }
  }
})

Making a slight adjustment by transitioning the template inside Counter to the following code snippet yields successful results:

render: h => h('div', state.count)

Answer №1

state is a Vue instance, meaning that variables within the data property can be accessed as properties in state. For example: state.count, or this.count internally within the state instance.

Since state.count is valid, it can be accessed anywhere below the initialization of state.

Therefore,

render: h => h('div', state.count)
is considered valid.

When accessing properties in the template, they must be internal properties of the Vue instance or component, or properties of this in Count.

This means that the template in the Counter component will translate into the corresponding render function:

render(h) {
    return h('div', this.state.count)
}

The expression {{state.count}} does not refer to the variable state.count, but rather a property of the Counter component - this.state.count.

To demonstrate (although not recommended for real projects), here is how you can make state.count valid in the Counter template:

const Counter = {
    template: `<div>{{state.count}}</div>`,
    data: () => ({
        state: {
            count: state.count
        }
    })
}

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