The editor provides a ton of commands to programmatically add or change content or alter the selection. If you want to build your own editor you definitely want to learn more about them.
All available commands are accessible through an editor instance. Let’s say you want to make text bold when a user clicks on a button. That’s how that would look like:
While that’s perfectly fine and does make the selected bold, you’d likely want to chain multiple commands in one run. Let’s have a look at how that works.
Most commands can be combined to one call. That’s shorter than separate function calls in most cases. Here is an example to make the selected text bold:
In the example above two different commands are executed at once. When a user clicks on a button outside of the content, the editor isn’t in focus anymore. That’s why you probably want to add a `.focus()` call to most of your commands. It brings back the focus to the editor, so the user can continue to type.
All chained commands are kind of queued up. They are combined to one single transaction. That means, the content is only updated once, also the `update` event is only triggered once.
By default Prosemirror **does not support chaining** which means that you need to update the positions between chained commands via [**Transaction mapping**](https://prosemirror.net/docs/ref/#transform.Mapping).
:::
For example you want to chain a **delete** and **insert** command in one chain, you need to keep track of the position inside your chain commands. Here is an example:
```js
// here we add two custom commands to the editor to demonstrate transaction mapping between two transaction steps
addCommands() {
return {
delete: () => ({ tr }) => {
const { $from, $to } = tr.selection
// here we use tr.mapping.map to map the position between transaction steps
const from = tr.mapping.map($from.pos)
const to = tr.mapping.map($to.pos)
tr.delete(from, to)
return true
},
insert: (content: string) => ({ tr }) => {
const { $from } = tr.selection
// here we use tr.mapping.map to map the position between transaction steps
const pos = tr.mapping.map($from.pos)
tr.insertText(content, pos)
return true
},
}
}
```
Now you can do the following without `insert` inserting the content into the wrong position:
When chaining a command, the transaction is held back. If you want to chain commands inside your custom commands, you’ll need to use said transaction and add to it. Here is how you would do that:
In some cases, it’s helpful to put some more logic in a command. That’s why you can execute commands in commands. I know, that sounds crazy, but let’s look at an example:
Sometimes, you don’t want to actually run the commands, but only know if it would be possible to run commands, for example to show or hide buttons in a menu. That’s what we added `.can()` for. Everything coming after this method will be executed, without applying the changes to the document:
For some of your own commands, you probably want to work with the raw [transaction](/api/introduction). To make them work with `.can()` you should check if the transaction should be dispatched. Here is how you can create a simple `.insertText()` command:
If you want to run a list of commands, but want only the first successful command to be applied, you can do this with the `.first()` method. This method runs one command after the other and stops at the first which returns `true`.
For example, the backspace key tries to undo an input rule first. If that was successful, it stops there. If no input rule has been applied and thus can’t be reverted, it runs the next command and deletes the selection, if there is one. Here is the simplified example:
All extensions can add additional commands (and most do), check out the specific [documentation for the provided nodes](/api/nodes), [marks](/api/marks), and [extensions](/api/extensions) to learn more about those. And of course, you can [add your custom extensions](/guide/custom-extensions) with custom commands aswell.
But how do you write those commands? There’s a little bit to learn about that.
:::pro Oops, this is work in progress
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