Creating a Vue2 modal within a v-for loop to display a dynamic

Question

Creating a Vue2 modal within a v-for loop to display a dynamic

Recently, I've been working on implementing a vue2 modal following the instructions provided in the official Vue documentation at https://v2.vuejs.org/v2/examples/modal.html.

The code snippet I have been using looks something like this:

<tbody v-if="fields.length">
    <tr v-for="(item, index) in fields">
        <td>@{{ item.name }}</td>
        <td><input type="checkbox" id="checkbox" v-model="item.active"></td>
        <td>
            <button id="show-modal" @click="showModal = true">Show Modal</button>
        </td>
    </tr>
    <modal :item="item" v-if="showModal" @close="showModal = false">
        <h3 slot="header">Hello World</h3>
    </modal>
</tbody>


Vue.component('modal', {
    template: '#modal-template',
    data: function() {
        return {
            item: ''
        }
    }
});

Even though the button triggers the modal successfully, I encountered a warning stating that

Property or method "item" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option.

. Additionally, upon inspecting the modal component using Vue dev tools, the value of item remains as an empty string '', indicating that it is not being populated by the :item binding as expected.

Could someone guide me on the correct approach to pass the item object into the modal so it can be utilized within the window?

javascript laravel vue.js vuejs2

Answer 1

Answer №1

When passing the variable item from a parent component to a child component, you should avoid using data and instead use props!

Vue.component('modal', {
    template: '#modal-template',
    props: ['item'],
    data: function() {
        return {

        }
    }
});

Answer 2

When passing the variable item from a parent component to a child component, you should avoid using data and instead use props!

Vue.component('modal', {
    template: '#modal-template',
    props: ['item'],
    data: function() {
        return {

        }
    }
});

Answer 3

Answer №2

Two important factors to consider:

It is crucial to reference the item in the data object as a prop for the component rather than directly. For example, use props: ['item'].
The modal should be within the loop's scope, which currently ends at the closing </tr> tag. To achieve this, modify the click action to trigger a method that takes the item and assigns it to a variable passed in like a prop. This approach involves changing from showModal = true to openModal(item). Then create a method that sets the required values. Here is an example:
```
openModal(item) {
  this.showModal = true;
  this.modalItem = item;
}

...

data: () => {
  modalItem: null
  ...
}
```

Answer 4

Two important factors to consider:

It is crucial to reference the item in the data object as a prop for the component rather than directly. For example, use props: ['item'].
The modal should be within the loop's scope, which currently ends at the closing </tr> tag. To achieve this, modify the click action to trigger a method that takes the item and assigns it to a variable passed in like a prop. This approach involves changing from showModal = true to openModal(item). Then create a method that sets the required values. Here is an example:
```
openModal(item) {
  this.showModal = true;
  this.modalItem = item;
}

...

data: () => {
  modalItem: null
  ...
}
```

Creating a Vue2 modal within a v-for loop to display a dynamic

Answer №1

Answer №2

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