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Learn how to effectively manage default values in Vue.js input fields with v-model. This guide provides a detailed solution to prevent default values from appearing in your input fields while still allowing dynamic calculations.
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This video is based on the question https://stackoverflow.com/q/68271562/ asked by the user 'Dave Melia' ( https://stackoverflow.com/u/2363215/ ) and on the answer https://stackoverflow.com/a/68271679/ provided by the user 'Boussadjra Brahim' ( https://stackoverflow.com/u/8172857/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Hide Default Value with v-model and Input Fields in Vue.js

When developing applications using Vue.js, you may encounter situations where you want to avoid showing default values in input fields. For instance, having an input field that displays 0 as a default can be misleading or annoying for users, as they have to delete this value before entering their desired input. In this post, we will explore how to manage default values in input fields bound with v-model to provide a better user experience.

Understanding the Problem

In Vue.js, when you bind an input field to a data property using v-model, the input will display the current value of that property. When initializing your data properties with 0, the input field will show this value by default. This can create confusion when a user wants to input a new value because they must first erase the 0.

Consider the following code snippet, where we have three input fields for different material costs:

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

Although we want to conveniently set initial values for calculations, we don't want them to appear as 0 in the text fields.

The Solution

To solve this issue, we can use computed properties instead of methods to calculate the total cost dynamically. Here's a step-by-step breakdown of the solution:

Step 1: Update Data Structure

Instead of showing 0 directly in the input fields, we can initialize these variables to empty strings. This approach avoids showing any default numeric values until the user types something.

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

Step 2: Use Computed Properties for Calculating Total Cost

By using computed properties, we can embed logic that ensures any empty inputs will be treated as 0 during calculations. Here's how we define the totalCost computed property:

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

Step 3: Updated Input Fields

Make sure to replace the input fields' configurations to accommodate the changes in data. You might want to change the type from "text" to "number" for better input validation:

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

Step 4: Final Implementation

Putting it all together, here's how the complete Vue instance looks:

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

Conclusion

By following these steps, you can eliminate the display of default 0 values in input fields using Vue.js, making the interface cleaner and more user-friendly. Using computed properties allows for dynamic calculations without the hassle of managing NaN values. This approach not only enhances user experience but also keeps your code clean and maintainable.

If you have any further questions or need more help with Vue.js, feel free to leave a comment below!