Tips on preventing the need for a placeholder Vue data structure at the start-up phase

Question

Tips on preventing the need for a placeholder Vue data structure at the start-up phase

Within my Vue-powered HTML, I came across the line:

<span>Last updated on {{incident.LastUpdate[0].date}}</span>

In the Vue instance, I have declared the data as:

data: {
    incident: {}
}

During the execution, the incident is asynchronously loaded. However, upon the initial page load, I encounter:

[Vue warn]: Error in render: "TypeError: Cannot read property '0' of undefined"
(...)
TypeError: Cannot read property '0' of undefined

This error is expected as the contents of incident are not available immediately. It gets resolved once the data is loaded. While I could ignore this error, I wanted to address it by preloading incident with fabricated data:

data: {
        incident: {
            LastUpdate: [
                {
                    date: null
                }
            ]
        },
    },

Although this fix eliminates the error, I find it to be an inelegant solution. It could also pose challenges if more data needs to be initialized.

My query: What is the recommended approach to handle this issue in Vue? Is using dummy data like my fix acceptable?

javascript vue.js

Answer 1

Answer №1

Initialize an empty array in your code. This will make it easier for fellow developers to grasp the data structure from the start.
Strive to keep your Markup as logic-less as possible. Utilize Computed methods to fetch the initial value, along with error handling.

Check out the following code snippet:

<template>
    <div>
        Last updated on {{lastUpdatedTime}}
    </div>
</template>
<script>
export default {
    data(){
        return {
            incident: {
                lastUpdate:[]
            }
        }
    },
    computed: {
        lastUpdatedTime () {
            if (this.incident.LastUpdate.length === 0) return '' // think about a default please :)
            return this.incident.LastUpdate[0].date
        }
    }

}
</script>

Answer 2

Initialize an empty array in your code. This will make it easier for fellow developers to grasp the data structure from the start.
Strive to keep your Markup as logic-less as possible. Utilize Computed methods to fetch the initial value, along with error handling.

Check out the following code snippet:

<template>
    <div>
        Last updated on {{lastUpdatedTime}}
    </div>
</template>
<script>
export default {
    data(){
        return {
            incident: {
                lastUpdate:[]
            }
        }
    },
    computed: {
        lastUpdatedTime () {
            if (this.incident.LastUpdate.length === 0) return '' // think about a default please :)
            return this.incident.LastUpdate[0].date
        }
    }

}
</script>

Tips on preventing the need for a placeholder Vue data structure at the start-up phase

Answer №1

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