Slots vue js
Understanding scoped slots in Vue.js
You will see that the state of each is preserved, and are different from one another: We also won't have any useful syntax highlighting within that string. For example, a component child with a scoped slot might look like the following. It's easy to explain what slots do, but it's hard to explain exactly why they are useful without using the term 'composability' , so I will give you a use case. Inside the v-for loop, item is an alias to the current list item. Thankfully, in the vuejs world, there's a much cleaner solution:
Getting Your Head Around Vue.js Scoped Slots
Scoped slots are a useful feature of Vue. The only problem is they're difficult to understand! Trying to get your head around the interweaving of parent and child scopes is like solving a tough math equation.
A good approach when you can't understand something easily is to try put it to use in solving a problem. In this article, I'll demonstrate how I used scoped slots to build a reusable list component. You can see the finished product in this Codepen. The special feature is that you can customize how the list items are rendered in every usage of the component.
Let's tackle the simplest use case first, and get my-list to render just one list of things: Generalizing my-list Now we want to make my-list versatile enough to render any kind of list. The second test case will be a list of colors, including a small swatch to show what the color looks like. To do this, we'll have to abstract any data specific to the shapes list. Since the items in our lists may be structured differently, we'll give my-list a slot so the parent can define how any particular list will display.
Superficial Components What we've just created works fine, but is not great code. But we've had to abstract all the logic for rendering the list into the parent. The component does little more than wrap the list with some presentational markup. Given that there's still repeated code in both declarations of the component i. Scoped Slots To allow us to do this, we'll use a scoped slot instead of a regular slot.
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Many of them are used a lot especially by UI libraries. So what does this strange set of words actually mean? Vue documentation says that A scoped slot is a special type of slot that functions as a reusable template that can be passed data to instead of already-rendered-elements. The sentence above kind of explains what scoped slots do, but it might be a bit too technical especially for beginners. To better understand what scoped slots are and why they are powerful, we will start by exploring slots first.
Slot example To put it simply a slot can be seen as a: A placeholder for content. An empty space that you want to fill in with some content Some missing lines of code that you want to add later on easily. Some usages for slots usually are: As stated above, the slot our Button component is simply an empty space that can be filled with whatever markup we want.
If you come from a react background, this is similar to props. They allow even more customization and might be useful in various scenarios. A scoped slot can be also seen as a placeholder for content but which can pass some contextual information from the component Some usages for scoped slots usually are: Generic lists Selects, autocomplete, components with exposed inner implementation details.
We will start with a generic list example: First, we created a List. This is not very different from our previous Button example. There is a subtle difference which transforms a simple slot into a scoped slot in the example above. The difference is in the: You can pass pretty much any and how many attributes you need or like.
In our case the item contains all the necessary properties we need. The snippet above is the use of our List. You can notice that again there is a subtle difference in our implementation compared to our previous simple slot example. You can see that link in the image below: The row naming for our scoped-slot is arbitrary and can be anything you like.
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