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You’re browsing the documentation for v2.x and earlier. For v3.x, click here.
This page assumes you’ve already read the Components Basics. Read that first if you are new to components.
In 2.6.0, we introduced a new unified syntax (the v-slot directive) for named and scoped slots. It replaces the slot and slot-scope attributes, which are now deprecated, but have not been removed and are still documented here. The rationale for introducing the new syntax is described in this RFC.
Slot Content
Vue implements a content distribution API inspired by the Web Components spec draft, using the <slot> element to serve as distribution outlets for content.
This allows you to compose components like this:
Then in the template for <navigation-link>, you might have:
When the component renders, <slot></slot> will be replaced by “Your Profile”. Slots can contain any template code, including HTML:
Or even other components:
If <navigation-link>‘s template did not contain a <slot> element, any content provided between its opening and closing tag would be discarded.
Compilation Scope
When you want to use data inside a slot, such as in:
That slot has access to the same instance properties (i.e. the same “scope”) as the rest of the template. The slot does not have access to <navigation-link>‘s scope. For example, trying to access url would not work:
As a rule, remember that:
Everything in the parent template is compiled in parent scope; everything in the child template is compiled in the child scope.
Fallback Content
There are cases when it’s useful to specify fallback (i.e. default) content for a slot, to be rendered only when no content is provided. For example, in a <submit-button> component:
We might want the text “Submit” to be rendered inside the <button> most of the time. To make “Submit” the fallback content, we can place it in between the <slot> tags:
Now when we use <submit-button> in a parent component, providing no content for the slot:
will render the fallback content, “Submit”:
But if we provide content:
Then the provided content will be rendered instead:
Named Slots
Updated in 2.6.0+. See here for the deprecated syntax using the slot attribute.
There are times when it’s useful to have multiple slots. For example, in a <base-layout> component with the following template:
For these cases, the <slot> element has a special attribute, name, which can be used to define additional slots:
A <slot> outlet without name implicitly has the name “default”.
To provide content to named slots, we can use the v-slot directive on a <template>, providing the name of the slot as v-slot‘s argument:
Now everything inside the <template> elements will be passed to the corresponding slots. Any content not wrapped in a <template> using v-slot is assumed to be for the default slot.
However, you can still wrap default slot content in a <template> if you wish to be explicit:
Either way, the rendered HTML will be:
Note that v-slot can only be added to a <template> (with one exception), unlike the deprecated slot attribute.
Scoped Slots
Updated in 2.6.0+. See here for the deprecated syntax using the slot-scope attribute.
Sometimes, it’s useful for slot content to have access to data only available in the child component. For example, imagine a <current-user> component with the following template:
We might want to replace this fallback content to display the user’s first name, instead of last, like this:
That won’t work, however, because only the <current-user> component has access to the user and the content we’re providing is rendered in the parent.
To make user available to the slot content in the parent, we can bind user as an attribute to the <slot> element:
Attributes bound to a <slot> element are called slot props. Now, in the parent scope, we can use v-slot with a value to define a name for the slot props we’ve been provided:
In this example, we’ve chosen to name the object containing all our slot props slotProps, but you can use any name you like.
Abbreviated Syntax for Lone Default Slots
In cases like above, when only the default slot is provided content, the component’s tags can be used as the slot’s template. This allows us to use v-slot directly on the component:
This can be shortened even further. Just as non-specified content is assumed to be for the default slot, v-slot without an argument is assumed to refer to the default slot:
Note that the abbreviated syntax for default slot cannot be mixed with named slots, as it would lead to scope ambiguity:
Whenever there are multiple slots, use the full <template> based syntax for all slots:
Destructuring Slot Props
Difference Between T Slot And V Slot
Internally, scoped slots work by wrapping your slot content in a function passed a single argument:
That means the value of v-slot can actually accept any valid JavaScript expression that can appear in the argument position of a function definition. So in supported environments (single-file components or modern browsers), you can also use ES2015 destructuring to pull out specific slot props, like so:
This can make the template much cleaner, especially when the slot provides many props. It also opens other possibilities, such as renaming props, e.g. user to person:
You can even define fallbacks, to be used in case a slot prop is undefined:
Dynamic Slot Names
New in 2.6.0+
Dynamic directive arguments also work on v-slot, allowing the definition of dynamic slot names:
Named Slots Shorthand
New in 2.6.0+
Similar to v-on and v-bind, v-slot also has a shorthand, replacing everything before the argument (v-slot:) with the special symbol #. For example, v-slot:header can be rewritten as #header:
However, just as with other directives, the shorthand is only available when an argument is provided. That means the following syntax is invalid:
Instead, you must always specify the name of the slot if you wish to use the shorthand:
Other Examples
Slot props allow us to turn slots into reusable templates that can render different content based on input props. This is most useful when you are designing a reusable component that encapsulates data logic while allowing the consuming parent component to customize part of its layout.
For example, we are implementing a <todo-list> component that contains the layout and filtering logic for a list:
Instead of hard-coding the content for each todo, we can let the parent component take control by making every todo a slot, then binding todo as a slot prop:
Now when we use the <todo-list> component, we can optionally define an alternative <template> for todo items, but with access to data from the child:
However, even this barely scratches the surface of what scoped slots are capable of. For real-life, powerful examples of scoped slot usage, we recommend browsing libraries such as Vue Virtual Scroller, Vue Promised, and Portal Vue.
Deprecated Syntax
The v-slot directive was introduced in Vue 2.6.0, offering an improved, alternative API to the still-supported slot and slot-scope attributes. The full rationale for introducing v-slot is described in this RFC. The slot and slot-scope attributes will continue to be supported in all future 2.x releases, but are officially deprecated and will eventually be removed in Vue 3.
Named Slots with the slot Attribute
Deprecated in 2.6.0+. See here for the new, recommended syntax.
To pass content to named slots from the parent, use the special slot attribute on <template> (using the <base-layout> component described here as example):
Or, the slot attribute can also be used directly on a normal element:
There can still be one unnamed slot, which is the default slot that serves as a catch-all for any unmatched content. In both examples above, the rendered HTML would be:
Scoped Slots with the slot-scope Attribute
Deprecated in 2.6.0+. See here for the new, recommended syntax.
To receive props passed to a slot, the parent component can use <template> with the slot-scope attribute (using the <slot-example> described here as example):
Here, slot-scope declares the received props object as the slotProps variable, and makes it available inside the <template> scope. You can name slotProps anything you like similar to naming function arguments in JavaScript.
Here slot='default' can be omitted as it is implied:
The slot-scope attribute can also be used directly on a non-<template> element (including components):
The value of slot-scope can accept any valid JavaScript expression that can appear in the argument position of a function definition. This means in supported environments (single-file components or modern browsers) you can also use ES2015 destructuring in the expression, like so:
Using the <todo-list> described here as an example, here’s the equivalent usage using slot-scope:
- Metric T Slot Aluminum Profiles
V Slot Rail
- Connectors
- Fasteners
- Accessories
- Frame to Floor
- Panel Accessories
- CarboSix Carbon Fiber
With T-Slot Aluminum, you get more value than you ever would with welded steel. Need flexibility? You've got it with t-slot aluminum. Need Versatility? Extruded aluminum has that too. Strong in the hot or the cold, corrosion resistant, extruded aluminum has everything you need to get a project done quickly and efficiently. No need to paint or weld unlike steel parts. Get whatever you need built fast and strong with our metric series profiles of extruded aluminum framing.
The T-slot Extruded Aluminum Advantage
For thousands of years humans have been fabricating useful, pleasing furnishings and other structures for the home and workplace out of an impressive range of materials, including straw, mud, stone, wood, brick, iron, steel, and other metals of various sorts. But it is only within the last hundred years or so that aluminum the most abundant metal in the Earth's crust has been utilized in an ever-increasing number of day-to-day applications. Partly this is because a cost-effective process for extracting aluminum from bauxite ore was not perfected until about 1920.
So there is one great advantage of employing aluminum for structural design purposes: it is plentiful. Its other advantageous properties include strength, lightness, formability, high ductility, and excellent corrosion-resistance. The innate utilitarian value of those properties is vastly magnified when the metal is formed into T-slot aluminum extrusions.
In a nutshell, T-slot aluminum forms the basis of a framing system for creating three-dimensional structural assemblies made with a variety of extruded and fabricated aluminum parts. With this system, each length of extruded aluminum contains one or more T-shaped indentations, or slots, into which various attachments (with ends also shaped like a 'T'?) conveniently fit and can slide up and down as needed. This allows you to interconnect other T-slotted aluminum parts into even the most complex configurations without having to clamp and weld them together as you would have to do with steel components.
Here are a few of the key advantages of adopting T-slot aluminum solutions to meet your structural design needs.
Strength
True, steel is harder and 'stronger.' But by the same token, aluminum is among the lightest of metals used for modern engineering purposes, with a molecular density one-third that of steel. As a result, it possesses a strength-to-weight ratio that is actually superior to that of steel . Contrary to what you might think, extruded aluminum is strong enough to handle most structural design and assembly applications.
Once you factor in the inconvenience of moving and positioning heavy pieces of steel not to mention the added labor cost of welding or riveting them together, drilling and tapping holes for mounting bolts, and then cleaning, prepping, priming, and painting the surface of the metal then T-slot aluminum becomes an increasingly attractive option if you are seeking cost-effective structural framing solutions.
Durability
If it's tough enough for trucks, military combat vehicles, and commercial airliners, then rest assured that aluminum is tough enough for more prosaic, everyday purposes. One key aspect of this durability is its resistance to rusting. Rust is to steel as rot is to wood. Unlike steel, for all intents and purposes aluminum doesn't rust at all. A microscopic layer of oxide (which is responsible for the silvery-gray color of anodized aluminum) naturally forms on the surface of the metal and prevents that from happening. You don't even have to prime and paint it in order to protect it! If any of your project's aluminum extrusions or other parts never rust, then you'll never have to replace them saving you money and down-time in the long run.
Versatility
Finally, one of the most important advantages to using T-slot aluminum extrusions and accessories is that, unlike permanently welded steel, the system is modular by design i.e., it is easily changeable. You can connect, position, and fasten together the aluminum profiles however you'd like, using the appropriate fasteners , connectors , and desired accessories . Later on, as needed, you can then adjust and rearrange them in any configuration you like.
The most common type of aluminum fastener used to fasten parts together is the T-nut: just drop it into the T-slot and then twist it into a locked position. That is so much easier than welding!
But where the real magic happens is in the versatility of our aluminum connectors. Just a partial list would include:
- quick connectors
- T-connectors
- tilt connectors
- milling connectors
- bolt connectors
- cube connectors
- angle connectors
- slotted gussets
- corner brackets
Once you've put the finishing touches on the assembly with end caps, casters, cable blocks, machining jigs, tool hangers, cabinet siding, doors, or any of a number of other accessories that we carry, you're good to go!
For maximum versatility for both both our international and domestic customers, be aware that our T-slot aluminum extrusions come in both metric profiles and inch profiles .
From carts to aquarium stands , from shelves to enclosures , and from ergonomic workbenches to eye-catching signs , Framing Tech T-slot aluminum extrusion systems are designed, machined, and assembled for versatility—and they are built to last.
T-Slot Aluminum FAQs
What is T-slot Aluminum Extrusion?
T-slot aluminum extrusion is a structural fabrication material that utilizes an engineered cross-sectional profile that is both strong and versatile in its use.
Will T-slot Aluminum Extrusion corrode?
Our aluminum extrusion is non-corrosive. This is mostly due to the clear anodized finish that comes standard on all of our extrusion, but also due in part to aluminums natural ability to oxidize. The oxidation process creates a secondary layer of protection from corrosion, similar to how copper will patina.
Is T-slot Aluminum Extrusion considered a “Green” material?
Yes! Due to excellent recycling practices most of the aluminum ever produced is still in use today. In fact, aluminum is 100% recyclable and of the most common materials recycled aluminum is the ONLY material that is infinitely recyclable. It is also much lighter than glass and steel per cubic inch, and has a much smaller carbon footprint during fabrication, processing, and shipping.
Why choose aluminum extrusion over steel?
The main advantages are that aluminum extrusion is more versatile, modular, easier to work with, and costs less than steel. Building with aluminum extrusion is as simple as inserting a connector into the t-slot and tightening it into place with standard hand tools. No need to clamp, weld or paint aluminum extrusion. T-slot aluminum extrusion makes it easy to re-locate pieces or add onto your current structure at any time.
What is aluminum extrusion used for?
Currently, T-slot aluminum extrusion is widely used in automation, material handling, safety guarding, manufacturing and laboratory applications. However, many people are adopting t-slot aluminum extrusion for use in a wide variety of projects. Some have even built their own machines such as 3D Printers and CNC machines using our aluminum extrusion.
What is a T-slot, and how do I use it?
A T-slot is what we call the channel that runs the length of our aluminum extrusion shapes. The T-slots are designed to a specific depth and width depending on the material. The T-slot is used mostly for mounting and fastening a wide variety of accessories and panels to the aluminum extrusion. Often, panels will be inserted into the T-slot to quickly create a wall or enclosure.