import {
  Story,
  Meta,
  html,
} from '@open-wc/demoing-storybook';

import { ajax } from '../src/ajax.js';
import { AjaxClass } from '../src/AjaxClass.js';

<Meta title="Others/Ajax" parameters={{ component: 'lion-ajax' }} />

# Ajax

`lion-ajax` is the global manager for handling all ajax requests.
It is a promise based system for fetching data, based on <a href="https://github.com/axios/axios" target="_blank">
axios</a>

<Story name="Default">
  {html`
    <button
      @click=${() => {
        ajax
          .get('./packages/ajax/stories/data.json')
          .then(response => {
            console.log(response.data);
          })
          .catch(error => {
            console.log(error);
          });
      }}
    >
      Execute Request to Action Logger
    </button>
  `}
</Story>

```js
ajax.get('./packages/ajax/stories/data.json').then(response => console.log(response.data));
```

## Features

- only JS functions, no (unnecessarily expensive) web components
- supports GET, POST, PUT, DELETE, REQUEST, PATCH and HEAD methods
- can be used with or without XSRF token

## How to use

### Installation

```sh
npm i --save @lion/ajax
```

```js
import { ajax, AjaxClass } from '@lion/ajax';
```

## Cancelable Request

It is possible to make an Ajax request cancelable, and then call `cancel()` to make the request provide a custom error once fired.

<Story name="Cancelable">
  {html`
    <button
      @click=${() => {
        const myAjax = AjaxClass.getNewInstance({ cancelable: true });
        requestAnimationFrame(() => {
          myAjax.cancel('too slow');
        });
        myAjax
          .get('./packages/ajax/stories/data.json')
          .then(response => {
            console.log(response.data);
          })
          .catch(error => {
            console.log(error);
          });
      }}
    >
      Execute Request to Action Logger
    </button>
  `}
</Story>

```js
const myAjax = AjaxClass.getNewInstance({ cancelable: true });

requestAnimationFrame(() => {
  myAjax.cancel('too slow');
});

myAjax
  .get('./packages/ajax/stories/data.json')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.log(error);
  });
```

## Cancel concurrent requests

You can cancel concurrent requests with the `cancelPreviousOnNewRequest` option.

<Story name="Cancel Previous on New Request">
  {html`
    <button
      @click=${() => {
        const myAjax = AjaxClass.getNewInstance({ cancelPreviousOnNewRequest: true });
        myAjax
          .get('./packages/ajax/stories/data.json')
          .then(response => {
            console.log(response.data);
          })
          .catch(error => {
            console.log(error.message);
          });
        myAjax
          .get('./packages/ajax/stories/data.json')
          .then(response => {
            console.log(response.data);
          })
          .catch(error => {
            console.log(error.message);
          });
      }}
    >
      Execute Both Requests to Action Logger
    </button>
  `}
</Story>

```js
const myAjax = AjaxClass.getNewInstance({ cancelPreviousOnNewRequest: true });

myAjax
  .get('./packages/ajax/stories/data.json')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.log(error.message);
  });

myAjax
  .get('./packages/ajax/stories/data.json')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.log(error.message);
  });
```

## Considerations

Due to a <a href="https://github.com/axios/axios/issues/385" target="_blank"> bug in axios</a> options may leak in to other instances.
So please avoid setting global options in axios. Interceptors have no issues.

## Future plans

- Eventually we want to remove axios and replace it with <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API" target="_blank">
Fetch</a>
- This wrapper exist to prevent this switch from causing breaking changes for our users
