Transmitting Django Information to Vue Component

Currently, I am utilizing Django as a backend and attempting to pass some data into a Vue table component that I have created. I followed this informative tutorial to set it up. The Vue component displays correctly when using webpack. My approach involves setting the data to a JavaScript constant and then passing it into the component. However, the data does not seem to be flowing through as expected. Below is the structure of my scripts:

index.html

{% block content %}
<script>
  const gridData = {{json_data|safe}};
  console.log(gridData)
</script>

    <div id="app">
        <table_component
        v-bind:tableData=this.gridData
        >
        </table_component>

    </div>  
{% end block %}

myComponent.vue script section

export default {
  name: 'table_component',
    props: {
    tableData: Array
  },
  data() {
      return {

      }
  },
  components: {
    Grid,
    ButtonModal
  },
  created(){
    console.log(this.tableData)
  },
}

Upon checking the console, no data appears. It simply displays undefined.

view.py

class CurrentClassroomView(LoginRequiredMixin, CreateView):
    template_name = 'home/index.html'

    def get(self, request, *args, **kwargs):
        db_data = list(myData.objects.all().values())
        my_json_data = json.dumps(db_data)
        return render(request, self.template_name, {'json_data':my_json_data})  

I encountered an error in the console regarding prop naming conventions which caused confusion since I passed the props with uppercase letters but they appeared in lowercase. Any assistance on resolving this issue would be highly appreciated. Thank you!

Answer №1

Binding gridData to a Vue component may not work due to different contexts between the data and the component. In Vue components, you can only access data defined within the Vue instance. Additionally, using {{json_data|safe}} can be a security risk for XSS-type attacks.

However, there is a simple and secure way to pass data from Django to a Vue component. By utilizing the json_script filter, we can load the data in Vue's mounted hook.

In views.py, simply pass the list to the template without needing to use json.dumps():

class CurrentClassroomView(LoginRequiredMixin, CreateView):
    template_name = 'home/index.html'

    def get(self, request, *args, **kwargs):
        db_data = list(myData.objects.all().values())
        return render(request, self.template_name, {'json_data':db_data}) 

In index.html, utilize the json_script template tag to create a JSON format of the json_data variable:

{% block content %}
{{ json_data|json_script:"json_data" }}

<div id="app">
    <table_component></table_component>
</div>  
{% end block %}

This will generate a <script> block with the data, like this:

<script id="json_data" type="application/json">{"hello": "world"}</script>

Lastly, in myComponent.vue, we decode the JSON data and set it in the mounted hook:

export default {
  data() {
      return {
          tableData
      }
  },
  components: {
    Grid,
    ButtonModal
  },
  mounted() {
    this.tableData = JSON.parse(document.getElementById('json_data').textContent)
  },
}

Answer №2

One way to seamlessly pass Django's server-side props into a child component is by structuring the setup as follows:

{% extends "ExpenseTracker/layout.html" %}
{% load static %}

{% block content %}
<div id="transactionlabeling_view"
>
 <transactions-table 
 :cached_items = "{{transactions}}"
 :account_types = "{{account_types}}"
 ></transactions-table>
</div>
{% endblock content %}

This code snippet showcases a Vue component that mounts on "#transactionlabeling_view". Within this component, the child component transactions-table is imported and the server-side props from Django view ({{transactions}} & {{account_types}}) are passed on as props (:cached_items & :account_types):

props:{
    cached_items:null,
    account_types:null
},

It's worth noting that there is no need to JSON.parse these props as Vue handles that for you. However, it is recommended to use JSON.dump on {{transactions}} & {{account_types}} before passing them as context in the HTML. This approach has been tested with vue 3.2.6 and Django 4.1.6, with Vue conveniently installed within Django.

Answer №3

For those working with Vue 3 and SFC syntax, utilizing the .provide() method (found within createApp()) is an effective way to handle this task. Within the Django template, pass your variables from the template via Django context.

In my approach, I incorporate a hidden and disabled <input element inside the div where the app will be loaded. While I cannot confirm if this is considered best practice, it does offer an added layer of security in my opinion...

The aspect that stands out to me the most about this method is how the mounted component takes over the data-provider DOM element (the hidden input)!

<!-- This excerpt is from the Django template file -->
<!-- vue_component_block.html -->
<div name="vue-component-mount-point">
  <input
    disabled
    type="hidden"
    data-url="{{ url_from_django_context }}"
    data-text="{{ link_text_from_django_context }}"
  />
</div>
<!-- The TS/JS bundle should also be included somewhere after the above template content -->
<script src="path/to/your/dist/folder/my_compiled_script.js"></script>
// A TypeScript file compiled into the Django app
import { createApp } from "vue";
import MyLinkComponent from "./MyLinkComponent.vue";

const mountPoints: [HTMLElement] = document.querySelectorAll('[name="vue-component-mount-point"]')

mountPoints.forEach((mountPoint: HTMLElement) => {
  const children: HTMLCollection = mountPoint.children
  const dataInput: HTMLElement = children[0] as HTMLInputElement
  const dataset: Object = dataInput.dataset
  createApp(MyLinkComponent)
    .provide('dataset', dataset)
    .mount(mountPoint);
})

Subsequently, within the component's .vue file, inject() comes into play to retrieve the data from the provider (utilizing the same dataset key).

<template>
  <MyLinkComponent
    :href="dataset['url']"
  >{{ dataset['text'] }}</MyLinkComponent>
</template>

<script setup lang="ts">
import { inject } from 'vue'
const dataset = inject('dataset')
</script>

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