Utilizing Vue alongside Laravel by passing null values as props

Question

Utilizing Vue alongside Laravel by passing null values as props

Is it permissible to provide a null prop? I have created a main component that accepts the user prop.

<div id="app">
    <master :user="{{ $user }}"></master>
</div>

The prop is declared as follows:

props   : {
    user: {
        type: Object
    }
},

Within the controller, I am passing the user variable only if the user is authenticated, otherwise I am passing null:

public function index()
{
    $user = Auth::check() ? Auth::user() : null;
    return view('master', compact('user'));
}

I am encountering an error message stating

The value for a v-bind expression cannot be empty

. I have attempted to resolve this issue by removing the colon to avoid binding and also explicitly specifying that the prop is not mandatory, but neither of those solutions has worked.

Is there a way to address this problem so that I can pass a null or empty object to Vue?

javascript laravel vue.js vuejs2 vue-router

Answer 1

Answer №1

In JavaScript, null is considered to be of type object. However, Vue's prop check does not treat null as an object, as explained here.

If $user is null, {{ $user }} will be converted to nothing, resulting in:

<master :user=""></master>

This will display an empty string.

You can either omit specifying the type entirely, like this:

props: ['user'],

Or if you prefer, specify the type as a string or Object:

props: {
    user: {
        type: [Object, String]
    }
},

Alternatively, you can create an empty object if $user is null:

<master :user="{{ $user ?? '{}' }}"></master>

Answer 2

In JavaScript, null is considered to be of type object. However, Vue's prop check does not treat null as an object, as explained here.

If $user is null, {{ $user }} will be converted to nothing, resulting in:

<master :user=""></master>

This will display an empty string.

You can either omit specifying the type entirely, like this:

props: ['user'],

Or if you prefer, specify the type as a string or Object:

props: {
    user: {
        type: [Object, String]
    }
},

Alternatively, you can create an empty object if $user is null:

<master :user="{{ $user ?? '{}' }}"></master>

Answer 3

Answer №2

While the provided solution offers a way to achieve the desired outcome, I believe it can be easily done by leveraging the PHP Null Coalescing Operator along with VUE Multiple Prop Types

Here is an example:

The VUE component's prop is updated to accept both the Object and null types

props: {
    user: {
        type: [Object, null]
    }
},

Then in the blade file

<div id="app">
    <master :user="{{ Auth::user() ?? 'null' }}"></master>
</div>

Answer 4

While the provided solution offers a way to achieve the desired outcome, I believe it can be easily done by leveraging the PHP Null Coalescing Operator along with VUE Multiple Prop Types

Here is an example:

The VUE component's prop is updated to accept both the Object and null types

props: {
    user: {
        type: [Object, null]
    }
},

Then in the blade file

<div id="app">
    <master :user="{{ Auth::user() ?? 'null' }}"></master>
</div>

Answer 5

Answer №3

One approach is to set null as the default value, which is a common practice for many developers.

props: {
    user: {
        type: Object,
        default: null,
    }
},

However, one drawback of this method is that once the user object transitions from null to an actual object, it cannot revert back to null.

To address this issue, some developers opt to use an empty object as the default value when they need to reset the object entirely.

props: {
    user: {
        type: Object,
        default: () => {},
    }
},

Answer 6

One approach is to set null as the default value, which is a common practice for many developers.

props: {
    user: {
        type: Object,
        default: null,
    }
},

However, one drawback of this method is that once the user object transitions from null to an actual object, it cannot revert back to null.

To address this issue, some developers opt to use an empty object as the default value when they need to reset the object entirely.

props: {
    user: {
        type: Object,
        default: () => {},
    }
},

Utilizing Vue alongside Laravel by passing null values as props

Answer №1

Answer №2

Answer №3

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