Скачать или смотреть How to Access the default Content Slot in a Vue Component

Learn how to utilize Vue.js to retrieve the `default` content slot in a component for dynamic data manipulation, such as doubling a number.
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This video is based on the question https://stackoverflow.com/q/64324239/ asked by the user 'nowox' ( https://stackoverflow.com/u/2612235/ ) and on the answer https://stackoverflow.com/a/64324353/ 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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Accessing the default Content Slot in Vue Components

Vue.js is a progressive JavaScript framework that allows developers to create dynamic user interfaces with ease. One of the powerful features of Vue is its component system, which allows for reusability and organization of code. However, a common question among developers is how to access the default content slot sent to a Vue component. In this guide, we will explore this concept by building a simple component that doubles a number passed as content through a default slot. Let's dive into the problem and the solution step by step.

The Problem

In Vue, components can receive data through properties, but sometimes, you might want to send data as content, specifically as a slot. For example, consider a scenario where you want to display a number and its double. The challenge is to access that number directly from the slot content instead of passing it as a property. How can we achieve this efficiently in Vue.js?

The Solution

To access the default slot content in a Vue component, you can use the this.$slots property. Below, we break down the steps you'll need to follow to create a simple component that fulfills this requirement.

Step 1: Create the Component

First, let's create a Vue component called twice. This component will take a number from the slot, double it, and display both the original and the doubled value.

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Step 2: Utilize the Component in Your Vue Instance

Now, you will use the twice component in your Vue instance. Make sure to include the Vue.js library in your HTML, and then create the instance with your component, as follows:

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Step 3: Breakdown of the Code

Template: The component's template uses a <slot> to render the content passed into it. It also displays the doubled value using {{ value }}.

Computed Property: The value computed property parses the text content of the default slot (accessed via this.$slots.default[0].text), converts it to an integer, and multiplies it by 2.

Mounted Hook: The mounted lifecycle hook logs the slot content to the console, demonstrating that you can access the slot’s content as soon as the component is mounted.

Step 4: Rendering the Component

When you render <twice>21</twice>, the output will display the original number and its double:

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Conclusion

By following these steps, you have successfully learned how to access the default content slot in a Vue component to retrieve dynamic data. This technique can be particularly useful for building flexible and reusable components. With the power of Vue.js, you can enhance your web applications by utilizing slots effectively.

Feel free to experiment with different inputs in the <twice> component to see how it dynamically calculates and displays the results. Happy coding!