Understanding the variance between the created and mounted events in Vue.js

Question

Understanding the variance between the created and mounted events in Vue.js

According to Vue.js documentation, the created and mounted events are described as follows:

created

The created event is called synchronously after the instance is created. By this point, the instance has completed setting up data observation, computed properties, methods, and watch/event callbacks. However, the mounting phase has not started yet, and the $el property will not be available.

mounted

The mounted event is triggered after the instance has been mounted, with el being replaced by vm.$el. When the root instance is mounted to an in-document element, vm.$el will also be in-document when mounted is called.

This event is not invoked during server-side rendering.

While I grasp the concept in theory, I have 2 inquiries regarding practical application:

Are there any scenarios where using created is preferable to mounted?
In real-life coding situations, what are some practical uses of the created event?

javascript vue.js

Answer 1

Answer №1

initiated() : once the processing of the settings is complete, you can access reactive information properties and modify them if desired. At this point, the DOM has not yet been mounted or added. Therefore, no DOM manipulation can be done here.

displayed(): triggered after the DOM has been rendered or mounted. Now you have access to the DOM elements and are able to perform DOM manipulations, such as retrieving the innerHTML:

console.log(element.innerHTML)

Here are your queries:

In which scenario would you choose to use initiated instead of displayed?

The initiated event is typically used for fetching data from a backend API and setting it to data properties. In situations where the mounted hook is unavailable in SSR, tasks like data retrieval should be handled within the initiated hook only.

What practical uses does the initiated event serve in real-world coding scenarios?

One common application is fetching initial required data (e.g., JSON) from an external API and assigning it to reactive data properties:

data:{
    myJson : null,
    errors: null
},
initiated(){
    //pseudo code
    database.retrieve().then((res) => {
        this.myJson = res.data;
    }).catch((err) => {
        this.errors = err;
    });
}

Answer 2

initiated() : once the processing of the settings is complete, you can access reactive information properties and modify them if desired. At this point, the DOM has not yet been mounted or added. Therefore, no DOM manipulation can be done here.

displayed(): triggered after the DOM has been rendered or mounted. Now you have access to the DOM elements and are able to perform DOM manipulations, such as retrieving the innerHTML:

console.log(element.innerHTML)

Here are your queries:

In which scenario would you choose to use initiated instead of displayed?

The initiated event is typically used for fetching data from a backend API and setting it to data properties. In situations where the mounted hook is unavailable in SSR, tasks like data retrieval should be handled within the initiated hook only.

What practical uses does the initiated event serve in real-world coding scenarios?

One common application is fetching initial required data (e.g., JSON) from an external API and assigning it to reactive data properties:

data:{
    myJson : null,
    errors: null
},
initiated(){
    //pseudo code
    database.retrieve().then((res) => {
        this.myJson = res.data;
    }).catch((err) => {
        this.errors = err;
    });
}

Answer 3

Answer №2

When using the created() hook, keep in mind that any data manipulation done in the browser may not be immediately reflected in the DOM before it is mounted. Simply put, there might be a delay in seeing the manipulated data in the browser's view of the DOM.

The mounted() hook comes into play after the DOM has been fully mounted or rendered, giving you access to the DOM elements and the ability to make further manipulations. It is best utilized when you need to interact with the DOM right before or after the initial rendering process.

Answer 4

When using the created() hook, keep in mind that any data manipulation done in the browser may not be immediately reflected in the DOM before it is mounted. Simply put, there might be a delay in seeing the manipulated data in the browser's view of the DOM.

The mounted() hook comes into play after the DOM has been fully mounted or rendered, giving you access to the DOM elements and the ability to make further manipulations. It is best utilized when you need to interact with the DOM right before or after the initial rendering process.

Understanding the variance between the created and mounted events in Vue.js

Answer №1

Answer №2

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