What is the specific order in which Vue.js components are created using the Created() method

When two components are loaded into a third component, what dictates the sequence in which the lifecycle methods for each component will execute?

Main Component

<template>
   <div>
        <component-a />
        <component-b />
   </div>
</template>

<script>
import ComponentA from './ComponentA.vue';
import ComponentB from './ComponentB.vue';

export default {
    components: {
       ComponentA,
       ComponentB
    }
}
</script>

ComponentA

<script>
export default {
   created() {
      console.log('Executed first');
   }
}
</script>

ComponentB

<script>
export default {
   created() {
      console.log('Executed second');
   }
}
</script>

Answer №1

It seems that relying on the ordering of components is not guaranteed in Vue. Ideally, sibling components should avoid direct communication with each other to minimize dependencies.

During rendering, Vue attempts to reuse child components from previous renders. The VNode matching algorithm considers various factors when pairing old nodes with new ones. Components for existing nodes will not have their created hook called again.

In the case of a fresh render without any existing components...

You can debug how the code handles this by using debugger statements instead of standard console logging. By pausing in the debugger, you can trace through the call stack to observe how components are created.

Currently, it seems that Vue processes children in the order they appear in the children array of the VNode. The createChild method loops through the array of children passed to it, retrieved from vnode.children via createElm.

Based on this logic, the created hooks for components should be called in the order they appear in the template, as long as there are no slots involved.

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