# Components Reference

Portal.js supports many components that can help you build amazing data portals similar to [this](https://catalog-portal-js.vercel.app/) and [this](https://portal-js.vercel.app/). 

In this section, we'll cover all supported components in depth, and help you understand their use as well as the expected properties. 

Components are grouped under the following sections:
* [UI](https://github.com/datopian/portal.js/tree/main/src/components/ui): Components like Nav bar, Footer, e.t.c 
* [Dataset](https://github.com/datopian/portal.js/tree/main/src/components/dataset): Components used for displaying a Frictionless dataset and resources
* [Search](https://github.com/datopian/portal.js/tree/main/src/components/search): Components used for building a search interface for datasets
* [Blog](https://github.com/datopian/portal.js/tree/main/src/components/blog): Components for building a simple blog for datasets
* [Views](https://github.com/datopian/portal.js/tree/main/src/components/views): Components like charts, tables, maps for generating data views
* [Misc](https://github.com/datopian/portal.js/tree/main/src/components/misc): Miscellaneos components like errors, custom links, etc used for extra design. 

### UI Components

In the UI we group all components that can be used for building generic page sections. These are components for building sections like the Navigation bar, Footer, Side pane, Recent datasets, e.t.c.  

#### [Nav Component](https://github.com/datopian/portal.js/blob/main/src/components/ui/Nav.js)

To build a navigation bar, you can use the `Nav` component as demonstrated below:

```javascript
import { Nav } from 'portal'

export default function Home(){

 const navMenu = [{ title: 'Blog', path: '/blog' },
                 { title: 'Search', path: '/search' }]
 
 return (
   <>
    <Nav logo="/images/logo.png" navMenu={navMenu}/>
    ...
   </>
 
 )
}
```

#### Nav Component Prop Types

Nav component accepts two properties:
* **logo**: A string to an image path. Can be relative or absolute.
* **navMenu**: An array of objects with title and path. E.g : [{ title: 'Blog', path: '/blog' },{ title: 'Search', path: '/search' }]


#### [Recent Component](https://github.com/datopian/portal.js/blob/main/src/components/ui/Recent.js)

The `Recent` component is used to display a list of recent [datasets](#Dataset) in the home page. This useful if you want to display the most recent dataset users have interacted with in your home page. 
To build a recent dataset section, you can use the `Recent` component as demonstrated below:

```javascript
import { Recent } from 'portal'

export default function Home() {

  const datasets = [
    {
      organization: {
        name: "Org1",
        title: "This is the first org",
        description: "A description of the organization 1"
      },
      title: "Data package title",
      name: "dataset1",
      description: "description of data package",
      resources: [],
    },
    {
      organization: {
        name: "Org2",
        title: "This is the second org",
        description: "A description of the organization 2"
      },
      title: "Data package title",
      name: "dataset2",
      description: "description of data package",
      resources: [],
    },
  ]

  return (
    <div>
      {/* Use Recent component */}
      <Recent datasets={datasets} />
    </div>
  )
}

```

Note: The `Recent` component is hyperlinked with the dataset name of the organization and the dataset name in the following format: 

> `/@<org name>/<dataset name>`

For instance, using the example dataset above, the first component will be link to page:

> `/@org1/dataset1`

and the second will be linked to:

> `/@org2/dataset2` 

This is useful to know when generating dynamic pages for each dataset. 

#### Recent Component Prop Types

The `Recent` component accepts the following properties:
* **datasets**: An array of [datasets](#Dataset)

### Dataset Components

The dataset component groups together components that can be used for building a dataset UI. These includes components for displaying info about a dataset, resources in a dataset as well as dataset ReadMe.

#### [KeyInfo Component](https://github.com/datopian/portal.js/blob/main/src/components/dataset/KeyInfo.js)

The `KeyInfo` components displays key properties like the number of resources, size, format, licences of in a dataset in tabular form. See example in the `Key Info` section [here](https://portal-js.vercel.app/). To use it, you can import the `KeyInfo` component as demonstrated below:
```javascript
import { KeyInfo } from 'portal'

export default function Home() {

  const datapackage = {
    "name": "finance-vix",
    "title": "VIX - CBOE Volatility Index",
    "homepage": "http://www.cboe.com/micro/VIX/",
    "version": "0.1.0",
    "license": "PDDL-1.0",
    "sources": [
      {
        "title": "CBOE VIX Page",
        "name": "CBOE VIX Page",
        "web": "http://www.cboe.com/micro/vix/historical.aspx"
      }
    ],
    "resources": [
      {
        "name": "vix-daily",
        "path": "vix-daily.csv",
        "format": "csv",
        "size": 20982,
        "mediatype": "text/csv",
      }
    ]
  }

  return (
    <div>
      {/* Use KeyInfo component */}
      <KeyInfo descriptor={datapackage} resources={datapackage.resources} />
    </div>
  )
}

```

#### KeyInfo Component Prop Types

KeyInfo component accepts two properties:
* **descriptor**: A [Frictionless data package descriptor](https://specs.frictionlessdata.io/data-package/#descriptor)
* **resources**: An [Frictionless data package resource](https://specs.frictionlessdata.io/data-resource/#introduction)


#### [ResourceInfo Component](https://github.com/datopian/portal.js/blob/main/src/components/dataset/ResourceInfo.js)

The `ResourceInfo` components displays key properties like the name, size, format, modification dates, as well as a download link in a resource object. See an example of a `ResourceInfo` component in the `Data Files` section [here](https://portal-js.vercel.app/).

You can import and use the`ResourceInfo` component as demonstrated below:
```javascript
import { ResourceInfo } from 'portal'

export default function Home() {

  const resources = [
    {
      "name": "vix-daily",
      "path": "vix-daily.csv",
      "format": "csv",
      "size": 20982,
      "mediatype": "text/csv",
    },
    {
      "name": "vix-daily 2",
      "path": "vix-daily2.csv",
      "format": "csv",
      "size": 2082,
      "mediatype": "text/csv",
    }
  ]

  return (
    <div>
      {/* Use Recent component */}
      <ResourceInfo resources={resources} />
    </div>
  )
}
```

#### ResourceInfo Component Prop Types

ResourceInfo component accepts a single property:
* **resources**: An [Frictionless data package resource](https://specs.frictionlessdata.io/data-resource/#introduction)


#### [ReadMe Component](https://github.com/datopian/portal.js/blob/main/src/components/dataset/Readme.js)

The `ReadMe` component is used for displaying a compiled dataset Readme in a readable format. See example in the `README` section [here](https://portal-js.vercel.app/).

> Note: By compiled ReadMe, we mean ReadMe that has been converted to plain string using a package like [remark](https://www.npmjs.com/package/remark).

You can import and use the`ReadMe` component as demonstrated below:
```javascript
import { ReadMe } from 'portal'
import remark from 'remark'
import html from 'remark-html'
import { useEffect, useState } from 'react'


const readMeMarkdown = `
    CBOE Volatility Index (VIX) time-series dataset including daily open, close,
    high and low. The CBOE Volatility Index (VIX) is a key measure of market
    expectations of near-term volatility conveyed by S&P 500 stock index option
    prices introduced in 1993.

    ## Data

    From the [VIX FAQ][faq]:

    > In 1993, the Chicago Board Options Exchange® (CBOE®) introduced the CBOE
    > Volatility Index®, VIX®, and it quickly became the benchmark for stock market
    > volatility. It is widely followed and has been cited in hundreds of news
    > articles in the Wall Street Journal, Barron's and other leading financial
    > publications. Since volatility often signifies financial turmoil, VIX is
    > often referred to as the "investor fear gauge".

    [faq]: http://www.cboe.com/micro/vix/faq.aspx

    ## License

    No obvious statement on [historical data page][historical]. Given size and
    factual nature of the data and its source from a US company would imagine this
    was public domain and as such have licensed the Data Package under the Public
    Domain Dedication and License (PDDL).

    [historical]: http://www.cboe.com/micro/vix/historical.aspx
`

export default function Home() {
  const [readMe, setreadMe] = useState("")

  useEffect(() => {
    async function processReadMe() {
      const processed = await remark()
        .use(html)
        .process(readMeMarkdown)
      setreadMe(processed.toString())
    }
    processReadMe()
  }, [])

  return (
    <div>
      <ReadMe readme={readMe} />
    </div>
  )
}

```

#### ReadMe Component Prop Types

The `ReadMe` component accepts a single property:
* **readme**: A string of a compiled ReadMe in html format. 

### [View Components](https://github.com/datopian/portal.js/tree/main/src/components/views)

View components is a set of components that can be used for displaying dataset views like charts, tables, maps, e.t.c. 

#### [Chart Component](https://github.com/datopian/portal.js/blob/main/src/components/views/Chart.js)

The `Chart` components exposes different chart components like Plotly Chart, Vega charts, which can be used for showing graphs. See example in the `Graph` section [here](https://portal-js.vercel.app/). 
To use a chart component, you need to compile and pass a view spec as props to the chart component. 
Each Chart type have their specific spec, as explained in this [doc](https://specs.frictionlessdata.io/views/#graph-spec).

In the example below, we assume there's a compiled Plotly spec:

```javascript
import { PlotlyChart } from 'portal'

export default function Home({plotlySpec}) {

  return (
    < div >
      <PlotlyChart spec={plotlySpec} />
    </div>
  )
}

```
> Note: You can compile views using the [datapackage-render](https://github.com/datopian/datapackage-views-js) library, as demonstrated in [this example](https://github.com/datopian/portal.js/blob/main/examples/dataset-frictionless/lib/utils.js).


#### Chart Component Prop Types

KeyInfo component accepts two properties:
* **spec**: A compiled view spec depending on the chart type. 

#### [Table Component](https://github.com/datopian/portal.js/blob/main/examples/dataset-frictionless/components/Table.js)

The `Table` component is used for displaying dataset resources as a tabular grid. See example in the `Data Preview` section [here](https://portal-js.vercel.app/). 
To use a Table component, you have to pass an array of data and columns as demonstrated below:

```javascript
import { Table } from 'portal' //import Table component

export default function Home() {

  const columns = [
    { field: 'id', headerName: 'ID' },
    { field: 'firstName', headerName: 'First name' },
    { field: 'lastName', headerName: 'Last name' },
    { field: 'age', headerName: 'Age' }
  ];

  const data = [
    { id: 1, lastName: 'Snow', firstName: 'Jon', age: 35 },
    { id: 2, lastName: 'Lannister', firstName: 'Cersei', age: 42 },
    { id: 3, lastName: 'Lannister', firstName: 'Jaime', age: 45 },
    { id: 4, lastName: 'Stark', firstName: 'Arya', age: 16 },
    { id: 7, lastName: 'Clifford', firstName: 'Ferrara', age: 44 },
    { id: 8, lastName: 'Frances', firstName: 'Rossini', age: 36 },
    { id: 9, lastName: 'Roxie', firstName: 'Harvey', age: 65 },
  ];

  return (
    <Table data={data} columns={columns} />
  )
}

```
> Note: Under the hood, Table component uses the [DataGrid Material UI table](https://material-ui.com/components/data-grid/), and as such all supported params in data and columns are supported. 


#### Table Component Prop Types

Table component accepts two properties:
* **data**: An array of column names with properties: e.g [{field: "col1", headerName: "col1"}, {field: "col2", headerName: "col2"}]
* **columns**: An array of data objects e.g. [ {col1: 1, col2: 2}, {col1: 5, col2: 7} ]


### [Search Components](https://github.com/datopian/portal.js/tree/main/src/components/search)

Search components groups together components that can be used for creating a search interface. This includes search forms, search item as well as search result list. 

#### [Form Component](https://github.com/datopian/portal.js/blob/main/src/components/search/Form.js)

The search`Form` component is a simple search input and submit button. See example of a search form [here](https://catalog-portal-js.vercel.app/search). 

The search `form` requires a submit handler (`handleSubmit`). This handler function receives the search term, and handles actual search. 

In the example below, we demonstrate how to use the `Form` component.

```javascript
import { Form } from 'portal'

export default function Home() {

  const handleSearchSubmit = (searchQuery) => {
    // Write your custom code to perform search in db
    console.log(searchQuery);
  }

  return (
    <Form
      handleSubmit={handleSearchSubmit} />
  )
}
```

#### Form Component Prop Types

The `Form` component accepts a single property:
* **handleSubmit**: A function that receives the search text, and can be customize to perform the actual search. 

#### [Item Component](https://github.com/datopian/portal.js/blob/main/src/components/search/Item.js)

The search`Item` component can be used to display a single search result. 

In the example below, we demonstrate how to use the `Item` component.

```javascript
import { Item } from 'portal'

export default function Home() {
  const datapackage = {
    "name": "finance-vix",
    "title": "VIX - CBOE Volatility Index",
    "homepage": "http://www.cboe.com/micro/VIX/",
    "version": "0.1.0",
    "description": "This is a test organization description",
    "resources": [
      {
        "name": "vix-daily",
        "path": "vix-daily.csv",
        "format": "csv",
        "size": 20982,
        "mediatype": "text/csv",
      }
    ]
  }

  return (
    <Item dataset={datapackage} />
  )
}
```

#### Item Component Prop Types

The `Item` component accepts a single property:
* **dataset**: A [Frictionless data package descriptor](https://specs.frictionlessdata.io/data-package/#descriptor)


#### [ItemTotal Component](https://github.com/datopian/portal.js/blob/main/src/components/search/Item.js)

The search`ItemTotal` is a simple component for displaying the total search result 

In the example below, we demonstrate how to use the `ItemTotal` component.

```javascript
import { ItemTotal } from 'portal'

export default function Home() {
  //do some custom search to get results
  const search = (text) => {
    return [{ name: "data1" }, { name: "data2" }]
  }
  //get the total result count
  const searchTotal = search("some text").length

  return (
    <ItemTotal count={searchTotal} />
  )
}
```

#### ItemTotal Component Prop Types

The `ItemTotal` component accepts a single property:
* **count**: An integer of the total number of results. 


### [Blog Components](https://github.com/datopian/portal.js/tree/main/src/components/blog)

These are group of components for building a portal blog. See example of portal blog [here](https://catalog-portal-js.vercel.app/blog)

#### [PostList Components](https://github.com/datopian/portal.js/tree/main/src/components/misc)

The `PostList` component is used to display a list of blog posts with the title and a short excerpts from the content.

In the example below, we demonstrate how to use the `PostList` component.

```javascript
import { PostList } from 'portal'

export default function Home() {

  const posts = [
    { title: "Blog post 1", excerpt: "This is the first blog excerpts in this list." },
    { title: "Blog post 2", excerpt: "This is the second blog excerpts in this list." },
    { title: "Blog post 3", excerpt: "This is the third blog excerpts in this list." },
  ]
  return (
    <PostList posts={posts} />
  )
}
```

#### PostList Component Prop Types

The `PostList` component accepts a single property:
* **posts**: An array of post list objects with the following properties:
    ```javascript
    [
        { 
          title: "The title of the blog post",
          excerpt: "A short excerpt from the post content",
        },
    ]
    ```

#### [Post Components](https://github.com/datopian/portal.js/tree/main/src/components/misc)

The `Post` component is used to display a blog post. See an example of a blog post [here](https://catalog-portal-js.vercel.app/blog/nyt-pa-platformen-opdateringsfrekvens-og-andres-data)

In the example below, we demonstrate how to use the `Post` component.

```javascript
import { Post } from 'portal'
import * as dayjs from 'dayjs' //For converting UTC time to relative format
import relativeTime from 'dayjs/plugin/relativeTime'

dayjs.extend(relativeTime)

export default function Home() {

  const post = {
    title: "This is a sample blog post",
    content: `<h1>A simple header</h1>
    The PostList component is used to display a list of blog posts
              with the title and a short excerpts from the content.
              In the example below, we demonstrate how to use the PostList component.`,
    createdAt: dayjs().to(dayjs(1620649596902)),
    featuredImage: "https://pixabay.com/get/ge9a766d1f7b5fe0eccbf0f439501a2cf2b191997290e7ab15e6a402574acc2fdba48a82d278dca3547030e0202b7906d_640.jpg"
  }

  return (
    <Post post={post} />
  )
}
```

#### Post Component Prop Types

The `Post` component accepts a single property:
* **post**: An object with the following properties:
```javascript
  {
    title: <The title of the blog post>
    content: <The body of the blog post. Can be plain text or html>
    createdAt: <The utc date when the post was last modified>
    featuredImage: < Url/relative url to post cover image>
  }
```


### [Misc Components](https://github.com/datopian/portal.js/tree/main/src/components/misc)

These are group of miscellaneous/extra components for extending your portal. They include components like Errors, custom links, etc.

#### [Error Component](https://github.com/datopian/portal.js/blob/main/src/components/misc/Error.js)

The `Error` component is used to display a custom error message.

In the example below, we demonstrate how to use the `Error` component.

```javascript
import { Error } from 'portal'

export default function Home() {

  return (
    <Error message="An error occured when loading the file!" />
  )
}
```

#### Error Component Prop Types

The `Error` component accepts a single property:
* **message**: A string with the error message to display. 
    
    
#### [Custom Component](https://github.com/datopian/portal.js/blob/main/src/components/misc/Error.js)

The `CustomLink` component is used to create a link with a consistent style to other portal components. 

In the example below, we demonstrate how to use the `CustomLink` component.

```javascript
import { CustomLink } from 'portal'

export default function Home() {

  return (
    <CustomLink url="/blog" title="Goto Blog" />
  )
}
```

#### CustomLink Component Prop Types

The `CustomLink` component accepts the following properties:

* **url**: A string. The relative or absolute url of the link. 
* **title**: A string. The title of the link

