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Vue Answers

How to assign object to model with Vue Vuetify v-autocomplete?

To assign an object to a model with v-autocomplete in Vue.js with Vuetify, you typically use the item-value and item-text properties to specify which properties of the objects in your items array should be used for the model’s value and text display. Here’s an example:

<template>
  <v-autocomplete
    v-model="selectedItem"
    :items="items"
    item-value="id"
    item-text="name"
    label="Select Item"
    return-object
  ></v-autocomplete>
</template>

<script>
export default {
  data() {
    return {
      selectedItem: null,
      items: [
        { id: 1, name: 'Item 1' },
        { id: 2, name: 'Item 2' },
        { id: 3, name: 'Item 3' }
      ]
    };
  }
};
</script>

In this example we have v-model="selectedItem" binds the selected object to the selectedItem data property.

:items="items" specifies the array of items to choose from.

item-value="id" indicates that the id property of each item object should be used as the model value.

item-text="name" specifies that the name property of each item object should be displayed as the text in the autocomplete dropdown.

return-object indicates that the v-model will return the selected object instead of just the value.

With this setup, when the user selects an item from the autocomplete dropdown, selectedItem will be assigned the corresponding object from the items array.

We can then access the selected object through selectedItem in your Vue component.

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Vue Answers

How to apply multiple conditional classes in Vue.js?

In Vue.js, we can apply multiple conditional classes to an element using either the object syntax or array syntax within the v-bind:class directive.

To do this we can do the following:

Using Object Syntax:

<template>
  <div :class="{ 'class1': condition1, 'class2': condition2, 'class3': condition3 }">
    <!-- Content -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      condition1: true,
      condition2: false,
      condition3: true
    };
  }
};
</script>

In this example, the classes class1, class2, and class3 are conditionally applied based on the values of condition1, condition2, and condition3.

Using Array Syntax:

<template>
  <div :class="[condition1 ? 'class1' : '', condition2 ? 'class2' : '', condition3 ? 'class3' : '']">
    <!-- Content -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      condition1: true,
      condition2: false,
      condition3: true
    };
  }
};
</script>

In this example, each class is conditionally added to the array if its respective condition evaluates to true.

Dynamic Classes with Computed Properties:

Alternatively, we can use computed properties to determine the classes dynamically based on certain conditions:

<template>
  <div :class="computedClasses">
    <!-- Content -->
  </div>
</template>

<script>
export default {
  computed: {
    computedClasses() {
      return {
        'class1': this.condition1,
        'class2': this.condition2,
        'class3': this.condition3
      };
    },
    data() {
      return {
        condition1: true,
        condition2: false,
        condition3: true
      };
    }
  }
};
</script>

In this approach, the computedClasses computed property returns an object with the class names as keys and the conditions as values.

Choose the method that best fits our use case and preference. Each method is effective for applying multiple conditional classes in Vue.js.

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Vue Answers

How to pass props to Vue root instance via attributes on element the app is mounted on?

In Vue.js, you can pass props to the root Vue instance using HTML attributes on the element where the app is mounted.

This can be achieved using the propsData option when creating the Vue instance.

To do this we write

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Pass Props to Vue Root Instance</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>
<body>
  <div id="app" app-title="Hello from Parent"></div>

  <script>
    // Define the child component
    Vue.component('child-component', {
      template: '<div>{{ propFromParent }}</div>',
      props: ['propFromParent']
    });

    // Create the Vue instance
    new Vue({
      el: '#app',
      // Access attributes passed to the element where the app is mounted
      propsData: {
        // Access the attribute 'app-title' and pass its value as a prop to the root instance
        titleProp: document.getElementById('app').getAttribute('app-title')
      },
      template: '<child-component :prop-from-parent="titleProp"></child-component>'
    });
  </script>
</body>
</html>

In this example, we have an HTML element with the ID app, which is where our Vue app will be mounted.

We define a child component child-component, which receives a prop called propFromParent.

In the Vue instance, we use the propsData option to pass props to the root instance.

We access the value of the app-title attribute using document.getElementById('app').getAttribute('app-title').

We then use this value as a prop (titleProp) in the template of the root instance, and pass it down to the child component as prop-from-parent.

Now, the value of the app-title attribute is passed as a prop to the child component.

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Vue Answers

How to fix TypeError: this.getOptions is not a function with Vue.js?

The error TypeError: this.getOptions is not a function typically occurs when we are trying to call a method or access a property that doesn’t exist on the current object. To fix this error in a Vue.js context, weshould check the following:

1. Check the Context

Ensure that we’re calling getOptions from the correct context. If we expect getOptions to be a method of our Vue component, make sure it’s defined within the component’s methods object.

export default {
  methods: {
    getOptions() {
      // Our implementation
    }
  }
};

2. Check Spelling and Capitalization

Ensure that we’re using the correct spelling and capitalization when calling getOptions. JavaScript is case-sensitive, so getOptions is different from getoptions.

3. Check Scope

Make sure that the method getOptions is defined within the appropriate scope and is accessible where it’s being called. If getOptions is defined in a different file or module, ensure that it’s imported correctly.

4. Check Vue Instance

If we’re using this.getOptions inside a Vue component method, ensure that getOptions is not a method defined on the Vue instance itself (this).

5. Check for Typos in Property Access

Ensure that we’re not trying to access getOptions on an incorrect object or property.

If we’re still encountering the error after checking these points, please provide more context or code examples, and I can offer more specific guidance.

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Vue Answers

How to remove hashbang #! from URL with Vue.js?

To remove the hashbang (#!) from the URL in a Vue.js application, we can use the HTML5 history mode provided by Vue Router.

1. Enable HTML5 History Mode in Vue Router

In our Vue Router configuration (usually in router/index.js), set the mode option to 'history':

import Vue from "vue";
import Router from "vue-router";

Vue.use(Router);

export default new Router({
  mode: "history",
  routes: [
    // We routes here
  ],
});

By setting the mode to 'history', Vue Router will use the HTML5 history API to manipulate the browser’s history stack, allowing we to use clean URLs without the hashbang.

2. Configure Server for History Mode

When using history mode, we need to ensure that our server is configured to handle requests to non-existent URLs by serving the main index.html file.

This is because, without the hashbang, URLs that correspond to routes in our Vue app may not exist on the server.

For example, in a Vue CLI project with Vue Router, we typically add a catch-all route in our server configuration to serve the index.html file for all routes:

// Express.js example
const express = require("express");
const path = require("path");

const app = express();

// Serve static files
app.use(express.static(path.join(__dirname, "dist")));

// Handle all other routes
app.get("*", (req, res) => {
  res.sendFile(path.join(__dirname, "dist", "index.html"));
});

// Start the server
const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

3. Build Our Vue App

Once we’ve configured Vue Router and our server, build our Vue.js application. If we’re using Vue CLI, we can run:

npm run build

This will create a production build of our app in the dist directory.

With these steps, our Vue.js application should now use clean URLs without the hashbang (#!).

However, ensure that our server is properly configured to handle routes when using HTML5 history mode.