• V-slot Append Outer
• V-slot Append
• Quasar V-slot Append
• Vuetify V-slot Append

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This how-to guide shows you how to deploy your app to Azure App Service from a Git repository on your local computer.

Prerequisites

To follow the steps in this how-to guide:

• If you don't have an Azure subscription, create a free account before you begin.

• Install Git.

• Have a local Git repository with code you want to deploy. To download a sample repository, run the following command in your local terminal window:

• Use Azure Cloud Shell using the Bash environment.

• If you prefer, install the Azure CLI to run CLI reference commands.

  • If you're using a local installation, sign in to the Azure CLI by using the az login command. To finish the authentication process, follow the steps displayed in your terminal. For additional sign-in options, see Sign in with the Azure CLI.

  • When you're prompted, install Azure CLI extensions on first use. For more information about extensions, see Use extensions with the Azure CLI.

  • Run az version to find the version and dependent libraries that are installed. To upgrade to the latest version, run az upgrade.

Prepare your repository

To get automatic builds from Azure App Service Kudu build server, make sure that your repository root has the correct files in your project.

To customize your deployment, include a .deployment file in the repository root. For more information, see Customize deployments and Custom deployment script.

Note

If you develop in Visual Studio, let Visual Studio create a repository for you. The project is immediately ready to be deployed by using Git.

Deploy with Kudu build server

The easiest way to enable local Git deployment for your app with the Kudu App Service build server is to use Azure Cloud Shell.

Configure a deployment user

FTP and local Git can deploy to an Azure web app by using a deployment user. Once you configure your deployment user, you can use it for all your Azure deployments. Your account-level deployment username and password are different from your Azure subscription credentials.

To configure the deployment user, run the az webapp deployment user set command in Azure Cloud Shell. Replace <username> and <password> with a deployment user username and password.

• The username must be unique within Azure, and for local Git pushes, must not contain the ‘@’ symbol.
• The password must be at least eight characters long, with two of the following three elements: letters, numbers, and symbols.

The JSON output shows the password as null. If you get a 'Conflict'. Details: 409 error, change the username. If you get a 'Bad Request'. Details: 400 error, use a stronger password.

Record your username and password to use to deploy your web apps.

Get the deployment URL

To get the URL to enable local Git deployment for an existing app, run az webapp deployment source config-local-git in the Cloud Shell. Replace <app-name> and <group-name> with the names of your app and its Azure resource group.

Note

If you are using a linux app-service-plan, you need to add this parameter: --runtime python 3.7

Or, to create a new Git-enabled app, run az webapp create in the Cloud Shell with the --deployment-local-git parameter. Replace <app-name>, <group-name>, and <plan-name> with the names for your new Git app, its Azure resource group, and its Azure App Service plan.

Either command returns a URL like: https://<deployment-username>@<app-name>.scm.azurewebsites.net/<app-name>.git. Use this URL to deploy your app in the next step.

Instead of using this account-level URL, you can also enable local Git by using app-level credentials. Azure App Service automatically generates these credentials for every app.

Get the app credentials by running the following command in the Cloud Shell. Replace <app-name> and <group-name> with your app's name and Azure resource group name.

Use the URL that returns to deploy your app in the next step.

Deploy the web app

1. Open a local terminal window to your local Git repository, and add an Azure remote. In the following command, replace <url> with the deployment user-specific URL or app-specific URL you got from the previous step.

2. Push to the Azure remote with git push azure main.

3. In the Git Credential Manager window, enter your deployment user password, not your Azure sign-in password.

4. Review the output. You may see runtime-specific automation, such as MSBuild for ASP.NET, npm install for Node.js, and pip install for Python.

5. Browse to your app in the Azure portal to verify that the content is deployed.

Deploy with Azure Pipelines builds

If your account has the necessary permissions, you can set up Azure Pipelines (Preview) to enable local Git deployment for your app.

• Your Azure account must have permissions to write to Azure Active Directory and create a service.

• Your Azure account must have the Owner role in your Azure subscription.

• You must be an administrator in the Azure DevOps project you want to use.

To enable local Git deployment for your app with Azure Pipelines (Preview):

1. In the Azure portal, search for and select App Services.

2. Select your Azure App Service app and select Deployment Center in the left menu.

3. On the Deployment Center page, select Local Git, and then select Continue.

4. On the Build provider page, select Azure Pipelines (Preview), and then select Continue.

5. On the Configure page, configure a new Azure DevOps organization, or specify an existing organization, and then select Continue.

   Note

   If your existing Azure DevOps organization isn't listed, you may need to link it to your Azure subscription. For more information, see Define your CD release pipeline.

6. Depending on your App Service plan pricing tier, you may see a Deploy to staging page. Choose whether to enable deployment slots, and then select Continue.

7. On the Summary page, review the settings, and then select Finish.

8. When the Azure Pipeline is ready, copy the Git repository URL from the Deployment Center page to use in the next step.

9. In your local terminal window, add an Azure remote to your local Git repository. In the command, replace <url> with the URL of the Git repository that you got from the previous step.

10. Push to the Azure remote with git push azure main.

11. On the Git Credential Manager page, sign in with your visualstudio.com username. For other authentication methods, see Azure DevOps Services authentication overview.

12. Once deployment is finished, view the build progress at https://<azure_devops_account>.visualstudio.com/<project_name>/_build, and the deployment progress at https://<azure_devops_account>.visualstudio.com/<project_name>/_release.

13. Browse to your app in the Azure portal to verify that the content is deployed.

What happens to my app during deployment?

All the officially supported deployment methods make changes to the files in the /home/site/wwwroot folder of your app. These files are used to run your app. Therefore, the deployment can fail because of locked files. The app may also behave unpredictably during deployment, because not all the files updated at the same time. This is undesirable for a customer-facing app. There are a few different ways to avoid these issues:

• Run your app from the ZIP package directly without unpacking it.
• Stop your app or enable offline mode for your app during deployment. For more information, see Deal with locked files during deployment.
• Deploy to a staging slot with auto swap enabled.

Troubleshoot deployment

You may see the following common error messages when you use Git to publish to an App Service app in Azure:

Additional resources

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:

V-slot Append Outer

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

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:

V-slot Append

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:

Quasar V-slot Append

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:

Vuetify V-slot Append