How to Select First Option by Default in Vue.js Dynamic Select Dropdowns

Learn how to set a default option in Vue.js using v-model for dynamic select dropdowns. This article breaks down the solution step by step!
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This video is based on the question https://stackoverflow.com/q/66883141/ asked by the user 'madameFerry' ( https://stackoverflow.com/u/696906/ ) and on the answer https://stackoverflow.com/a/66884148/ provided by the user 'Dev Catalin' ( https://stackoverflow.com/u/4690525/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Select First Option by Default in Vue.js Dynamic Select Dropdowns

When working with Vue.js, you might encounter a situation where you want to display a default option in a dynamic select dropdown. A common question that arises is: how can you effectively set the first option to say, "Choose your location," while ensuring that the user's selection is properly managed with v-model?

In this guide, we'll explore the issue and provide a clear, step-by-step solution that will allow you to set a default option in your select dropdown.

Understanding the Problem

A parent component contains a child component with a select dropdown where the first option ("Choose your location...") does not appear when using v-model. The reason for this is that v-model binds the select's value to a prop, preventing the default option from being displayed properly.

To fix this, we need to adjust our approach while ensuring that we maintain best practices in Vue.js development.

Step-by-Step Solution

To set a default option in your Vue.js select dropdown, follow these organized steps:

1. Modify the Data Method

Start by adding a new variable called selectedSegmentLocation in your child component's data method. This variable will handle the selected option and should have a default value that allows the default option to be visible.

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2. Update the Template

Next, modify the template where the select dropdown is defined. Ensure that the default "Choose your location..." option has both a value attribute and the selected property:

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3. Adjust the v-model Binding

Now, update the v-model in the select element to bind it to the new selectedSegmentLocation variable. This ensures that the select dropdown's bound value can be manipulated without altering the prop directly.

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4. Update the Method for Selection

Ensure that your selection method emits the new variable when an option is selected. This is crucial for keeping the parent component aware of the user's choice.

[[See Video to Reveal this Text or Code Snippet]]

5. Utilize Parent Prop in the Created Hook (Optional)

If you still want to use the passed prop (segmentLocation) as a default value, employ it in the component’s created() hook. However, remember to keep "NOT_SELECTED" as the default to display the placeholder option.

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6. Implement a Watcher for Dynamic Updates

Lastly, if you need to enable changes from the parent, implement a watcher to watch the segmentLocation prop:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the steps outlined above, you can successfully display a default option in your Vue.js select dropdown while leveraging v-model. Not only does this provide a better user experience, but it also ensures that your components adhere to Vue.js best practices.

Go ahead and implement these changes in your Vue.js applications, and you'll find that handling dynamic select dropdowns becomes much more straightforward. Happy coding!

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