How to automatically choose the first option in a v-for loop in Vue.js

Question

How to automatically choose the first option in a v-for loop in Vue.js

I have a loop that creates a dropdown menu from an array:

 <select class="form-control" v-model="compare_version" >
            <option
              v-for="(version, index) in allVersions"
              v-bind:value="index"
              v-bind:key="version.versionid"
              :selected="version.versionid === 0"
            >{{ version.versionid }}</option>
          </select>

My goal is to set the first value of the dropdown as the default.

The options are showing up but the first one is not being selected by default.

Can anyone spot the mistake in my code? Your help would be much appreciated!

javascript vue.js v-for

Answer 1

Answer №1

To set the default value as 0 for compare_version, you can do so within the data() function while binding the index from the iterating list as the captured value in the model. The use of v-model will handle this process efficiently.

Furthermore, it is advisable to remove the :selected binding when keeping in mind that the captured value from the select tag corresponds to the index of the list.

var vm = new Vue({
  el: "#vue-instance",
  data: {
    compare_version: 0,
    allVersions: [
      {versionId: 'A'},
      {versionId: 'B'},
      {versionId: 'C'}
    ]
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
 <!DOCTYPE html>
<html>
<body>
<div id="vue-instance">
<select v-model="compare_version">
    <option v-for="(x,index) in allVersions"
            v-bind:value="index"
            v-bind:key="x.text">{{x.versionId}}</option>
  </select>
  <span>Selected: {{ compare_version }}</span>
</div>
</body>
</html>

Answer 2

To set the default value as 0 for compare_version, you can do so within the data() function while binding the index from the iterating list as the captured value in the model. The use of v-model will handle this process efficiently.

Furthermore, it is advisable to remove the :selected binding when keeping in mind that the captured value from the select tag corresponds to the index of the list.

var vm = new Vue({
  el: "#vue-instance",
  data: {
    compare_version: 0,
    allVersions: [
      {versionId: 'A'},
      {versionId: 'B'},
      {versionId: 'C'}
    ]
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
 <!DOCTYPE html>
<html>
<body>
<div id="vue-instance">
<select v-model="compare_version">
    <option v-for="(x,index) in allVersions"
            v-bind:value="index"
            v-bind:key="x.text">{{x.versionId}}</option>
  </select>
  <span>Selected: {{ compare_version }}</span>
</div>
</body>
</html>

How to automatically choose the first option in a v-for loop in Vue.js

Answer №1

Similar questions

Can coveralls/codecov be utilized on a local machine?

What is causing the lack of updated data on the components when navigating to a different page? (Vue.JS 2)

Choose a node from descendants based on its attribute

Columns that can be resized in a right-to-left (

Converting JSON data to HTML using Handlebars

Utilize Function to Gain Access to React Context

Encountering an unrecognized error on Windows when attempting to execute a child process with regex return

Angular.js - index template fails to execute controller, but other templates work flawlessly

Waiting for all API queries in VueJS is important to ensure that all data has been

Using single quotation marks in Javascript

Defining a property of an object within a Vue Class

What is the best way to export two functions from a server-side module in JavaScript?

Using ElectronJS requires the usage of the import keyword to load ES Modules

To properly render an HTML file before loading a JavaScript file, express.static fails to serve the HTML file

Attempting to show different fields depending on the chosen option

Divergence in results: discrepancy found in the outputs of nodejs crypto module and tweetnacl.js

What is the best way to save and retain cache data for an audio file?

A guide on converting nested arrays within a JSON file into a table format in Google Sheets (possibly leveraging Javascript?)

Dynamic tooltips with jQuery: enhancing user experience through mouseover and

Optimizing load behavior in React using Node.js Express and SQL operations