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# API Reference
### Application
- [XTerminal](#xterminal) extends [XEventEmitter](#xeventemitter)
- [XTerminal.version](#xterminal-version)
- [XTerminal.XEventEmitter](#xterminal-xeventemitter)
- [term.mount()](#term-mount)
- [term.dispose()](#term-dispose)
### Input
- [term.focus()](#term-focus)
- [term.blur()](#term-blur)
- [term.pause()](#term-pause)
- [term.resume()](#term-resume)
- [term.setInput()](#term-setinput)
- [term.clearInput()](#term-clearinput)
- [term.setCompleter()](#term-setcompleter)
### Output
- [XTerminal.escapeHTML()](#xterminal-escapehtml)
- [term.write()](#term-write)
- [term.writeln()](#term-writeln)
- [term.writeSafe()](#term-writesafe)
- [term.writelnSafe()](#term-writelnsafe)
- [term.clear()](#term-clear)
- [term.clearLast()](#term-clearlast)
### History
- [term.history](#term-history)
- [term.clearHistory()](#term-clearhistory)
---
## XEventEmitter
Event emitter
- **Type**
```ts
// Event Identifier
type IEventName = string | symbol;
// Event Listener
type IEventListener = (...args: unknown[]) => void;
type IEventHandler = (ev: IEventName, listener: IEventListener) => void;
interface IEventEmitter {
on: IEventHandler;
once: IEventHandler;
off: IEventHandler;
emit(ev: IEventName, ...args: unknown[]): void;
}
```
- **Details**
**Methods**
`on`: Appends a event listener to the specified event
`once`: Appends a **one-time** event listener to the specified event
`off`: Removes an event listener from the specified event
`emit`: Triggers an event with arguments if any
- **See also:** [Guide - Events](../guide/events.md)
## XTerminal
Creates a terminal instance
- **Type**
```ts
interface XTerminal {
// ...
}
interface TerminalOptions {
target: HTMLElement | string;
}
class Terminal extends XEventEmitter implements XTerminal {
constructor(options: TerminalOptions);
}
```
- **Details**
The constructor takes one argument, `options` containing the `target` element reference.
If the `target` element is provided, the [term.mount()](#term-mount) method is called automatically.
- **Example**
```js
import XTerminal from 'xterminal';
const term = new XTerminal({/* options */});
```
- **See also:** [Guide - Creating a Terminal](../guide/initialization.md#creating-your-first-terminal)
## XTerminal.version
The version number
- **Type**
```ts
interface XTerminal {
readonly version: string;
}
```
- **Details**
This is a static property that stores the version used. It is important when reporting bugs or issues.
- **Example**
```js
import XTerminal from 'xterminal';
console.log(XTerminal.version);
```
## XTerminal.XEventEmitter
The event emitter class
- **Type**
Same as [XEventEmitter](#xeventemitter).
- **Details**
This is a static property (class) that can be used to create independent instances of the event emitter
- **Example**
```js
const emitter = new XTerminal.XEventEmitter();
```
## XTerminal.escapeHTML()
Escapes user input so it can be safely rendered as HTML text.
- **Type**
```ts
interface XTerminal {
static escapeHTML(data?: string): string;
}
```
- **Details**
It preserves all characters by converting them to HTML entities where needed.
This is **recommended** for use on user input or any arbitrary data.
- **Example**
```js
XTerminal.escapeHTML("<b>hello</b>");
// => &lt;b&gt;hello&lt;/b&gt;
```
- **See also:** [Guide - Safe Output](../guide/output.md#safe-output)
## term.mount()
Mounts the terminal instance structure to the specified DOM element.
- **Type**
```ts
interface XTerminal {
mount(target: HTMLElement | string): void;
}
```
- **Details**
It takes one argument that must be an actual DOM element or a CSS selector. The element's `innerHTML` is cleared first and then the terminal structure is rendered.
If no argument is passed, it throws an error and nothing is rendered.
The `term.mount()` method should only be called once for each terminal instance only if the `target` element option in the [constructor](#xterminal) is not provided.
- **Example**
```js
import XTerminal from 'xterminal';
const term = new XTerminal();
term.mount('#app');
```
or mount to an actual DOM element directly:
```js
term.mount(
document.getElementById('app')
);
```
- **See also:** [Guide - Creating a Terminal](../guide/initialization.md#creating-your-first-terminal)
## term.dispose()
Gracefully close the terminal instance.
- **Type**
```ts
interface XTerminal {
dispose(): void;
}
```
- **Details**
This detaches all event listeners, unmounts the terminal from the DOM and clears the backing functionality of the terminal.
_The terminal should not be used again once disposed._
- **Example**
Dispose on window unload event
```js
window.onunload = () => term.dispose();
```
- **See also:** [Guide - Disposal](../guide/disposal.md)
## term.focus()
Focus the terminal input component - ready for input.
- **Type**
```ts
interface XTerminal {
focus(): void;
}
```
- **Details**
This method takes no argument. It focuses the underlying input component of the terminal.
Clicking or tapping in the terminal also invokes the method.
- **Example**
After mounting the terminal instance
```js
term.focus();
```
## term.blur()
Blurs the terminal input component.
- **Type**
```ts
interface XTerminal {
blur(): void;
}
```
- **Details**
This method blurs the input component of the terminal.
- **Example**
```js
term.blur();
```
## term.pause()
Deactivate the terminal input component.
- **Type**
```ts
interface XTerminal {
pause(): void;
}
```
- **Details**
This method will stop events and input from being written to the terminal but rather input will be buffered.
**NB:** It is used in conjuction with [term.resume()](#term-resume).
- **Example**
Prevent a user from sending input (non-interactive mode)
```js
term.pause();
```
- **See also:** [Guide - Pause & Resume](../guide/prompt.md#pause-resume)
## term.resume()
Activate the terminal input component
- **Type**
```ts
interface XTerminal {
resume(): void;
}
```
- **Details**
This method will enable events dispatch and user input if they were deactivate using [term.pause()](#term-pause).
- **Example**
Pause the terminal until user input is required
```js
term.pause();
// ...
// do something
// ...
term.resume();
```
- **See also:** [Guide - Pause & Resume](../guide/prompt.md#pause-resume)
## term.setInput()
Sets the value of the terminal input buffer
- **Type**
```ts
interface XTerminal {
setInput(value: string): void;
}
```
- **Details**
This method will set/modify the contents of the input buffer.
- **Example**
Presetting some input when the terminal is loaded or resumed
```js
term.setInput("echo 'Hello World'");
```
- **See also:** [Guide - Set & Clear](../guide/prompt.md#set-clear)
## term.clearInput()
Clears the terminal input buffer
- **Type**
```ts
interface XTerminal {
clearInput(): void;
}
```
- **Details**
This method will empty/clear the contents of the input buffer.
- **Example**
Clearing the input buffer when the terminal [resumes](#term-resume)
```js
term.clearInput();
```
- **See also:** [Guide - Set & Clear](../guide/prompt.md#set-clear)
## term.setCompleter()
Sets the autocomplete function that is invoked on Tab key.
- **Type**
```ts
interface XTerminal {
setCompleter(fn: (data: string) => string): void;
}
```
- **Details**
This method take one argument that is a function which takes a string parameter and returns a string.
The autocomplete functionality depends highly on the completer function `fn`.
The `fn` parameter should return a better match for the input data string.
- **Example**
```js
term.setCompleter(data => {
const options = ['.help', '.clear', '.exit'];
return options.filter(s => s.startsWith(data))[0] || '';
});
```
- **See also:** [Guide - Autocomplete](../guide/autocomplete.md)
## term.write()
Write data to the terminal.
- **Type**
```ts
interface XTerminal {
write(data: string | number, callback?: () => void): void;
}
```
- **Details**
`data`: The data to write to the terminal
`callback`: Optional function invoked on successful write
- **Example**
```js
term.write('John: Hello ');
term.write('from the Eastside', () => console.log('Done!'));
```
- **See also:** [Guide - Output](../guide/output.md#output)
## term.writeln()
Write data to the terminal, followed by a break line character (\n).
- **Type**
```ts
interface XTerminal {
writeln(data: string | number, callback?: () => void): void;
}
```
- **Details**
`data`: The data to write to the terminal
`callback`: Optional function invoked on successful write
- **Example**
```js
term.writeln('Hello World!');
term.writeln('Welcome!', () => console.log('Done!'));
```
- **See also:** [Guide - Output](../guide/output.md#output)
## term.writeSafe()
Securely write data to the terminal.
- **Type**
```ts
interface XTerminal {
writeSafe(data: string | number, callback?: () => void): void;
}
```
- **Details**
`data`: The data to write to the terminal
`callback`: Optional function invoked on successful write
- **Example**
```js
term.writeSafe('<h1>hello</h1>');
// &lt;h1&gt;hello&lt;/h1&gt;
```
- **See also:** [Guide - Output](../guide/output.md#output)
## term.writelnSafe()
Securely write data to the terminal, followed by a break line character (\n).
- **Type**
```ts
interface XTerminal {
writelnSafe(data: string | number, callback?: () => void): void;
}
```
- **Details**
`data`: The data to write to the terminal
`callback`: Optional function invoked on successful write
- **Example**
```js
term.writelnSafe('<h1>hello</h1>');
// &lt;h1&gt;hello&lt;/h1&gt;<br/>
```
- **See also:** [Guide - Output](../guide/output.md#output)
## term.clear()
Clear the entire terminal.
- **Type**
```ts
interface XTerminal {
clear(): void;
}
```
- **Details**
When invoked, the entire terminal output is cleared.
This method also triggers the `clear` event.
- **Example**
Clear on CTRL+L using [keypress](../guide/events.md#default-events) event
```js
term.on('keypress', e => {
if (e.key == 'l' && e.ctrlKey) {
term.clear();
}
});
```
- **See also:** [Guide - Example using events](../guide/events.md#example)
- **See also:** [Guide - Output](../guide/output.md#clear-screen)
## term.clearLast()
Remove the element containing the previous output.
- **Type**
```ts
interface XTerminal {
clearLast(): void;
}
```
- **Details**
This is like the undo for only one write operation.
- **Example**
Greet with `Hello World` and replace it with `Hello Dev` after 5 seconds
```js
term.writeln('Hello World!');
setTimeout(() => {
term.clearLast();
term.write('Hello Dev!');
}, 5000);
```
- **See also:** [Guide - Output](../guide/output.md#clear-last-output)
## term.history
Access the history stack.
- **Type**
```ts
interface XTerminal {
history: string[];
}
```
- **Details**
Manages an array of entries in the history stack.
- **Example**
Log the history whenever a new entry is added
```js
term.on('data', () => console.log(term.history));
```
- **See also:** [History](../guide/history.md)
## term.clearHistory()
Clear the entire history stack.
- **Type**
```ts
interface XTerminal {
clearHistory(): void;
}
```
- **Details**
It take no argument as its sole role is to clear the entire local history of inputs which are accessible iteratively using `ArrowUp` and `ArrowDown` keys.
- **Example**
Clear history on `CTRL+H` using [keypress](../guide/events.md#default-events) event
```js
term.on('keypress', e => {
if (e.ctrlKey && e.key == 'h') {
term.clearHistory();
}
});
```
- **See also:** [History](../guide/history.md)