GeoDistanceDropdown

GeoDistanceDropdown creates a location search based dropdown UI component that is connected to a database field. It is used for distance based filtering.

Example uses:

• finding restaurants in walking distance from your location.
• discovering things to do near a landmark.

Usage

Basic Usage

<ReactiveBase
  mapLibraries={['places']} // required
>
  <GeoDistanceDropdown
    componentId="LocationUI"
    dataField="location"
    data={[
      { distance: 20, label: '< 20 miles' },
      { distance: 50, label: '< 50 miles' },
      { distance: 100, label: '< 100 miles' },
    ]}
  />
</ReactiveBase>

Usage With All Props

<ReactiveBase
  mapLibraries={['places']} // required
>
  <GeoDistanceDropdown
    componentId="locationUI"
    dataField="location"
    title="Location Dropdown Selector"
    data={
      [
        { "distance": 20, "label": "< 20 miles" },
        { "distance": 50, "label": "< 50 miles" },
        { "distance": 100, "label": "< 100 miles" },
      ]
    }
    defaultValue={{
      location: "London, UK"
      label: "< 100 miles"
    }}
    countries={["uk"]}
    placeholder="Select a distance range.."
    unit="mi"
    autoLocation={true}
    showFilter={true}
    filterLabel="Location"
    URLParams={false}
    render={({ loading, error, data, handleChange, downshiftProps }) => {
        if (loading) {
          return <div>Fetching Results.</div>;
        }
        if (error) {
          return <div>Something went wrong! Error details {JSON.stringify(error)}</div>;
        }
        if(downshiftProps.isOpen === false){
          return null;
        }
        return data.map(item => (
          <div onClick={() => handleChange(item)} key={item.label}>
            <span>{item.label}</span>
            <span>{item.distance}</span>
          </div>
        ));
      }
    }
    // use either renderItem OR render prop
    renderItem={(label, isSelected) => (
      <div>
          <span style={{
              marginLeft: 5, color: isSelected ? 'red' : 'dodgerblue'
          }}>
              {label}
          </span>
      </div>
    )}
    onData={
      (prop) => {
        const {value, error} = prop;
        // do something
      }
    }
  />
</ReactiveBase>

Props

componentId

unique identifier of the component, can be referenced in other components' react prop.

dataField

data field to be connected to the component's UI view.

nestedField

use to set the nested mapping field that allows arrays of objects to be indexed in a way that they can be queried independently of each other. Applicable only when dataField is a part of nested type.

data

collection of UI labels with associated distance value.

title

title of the component to be shown in the UI.

defaultValue

pre-select values of the search query with label and location keys.

placeholder

set the placeholder to show in the location search box, useful when no option is defaultValue.

value

controls the current value of the component. It sets the item from the list & also sets the location (on mount and on update). Use this prop in conjunction with onChange function.

onChange

is a callback function which accepts component's current value as a parameter. It is called when you are using the value prop and the component's value changes. This prop is used to implement the controlled component behavior.

showIcon

whether to display a search or custom icon in the input box. Defaults to true.

iconPosition

sets the position of the search icon. Can be left or right. Defaults to right.

icon

displays a custom search icon instead of the default 🔍

unit

unit for distance measurement, uses mi (for miles) by default. Distance units can be specified from the following:

autoLocation

when enabled, preset the user's current location in the location search box. Defaults to true.

showFilter

show as filter when a value is selected in a global selected filters view. Defaults to true.

filterLabel

An optional label to display for the component in the global selected filters view. This is only applicable if showFilter is enabled. Default value used here is componentId.

URLParams

enable creating a URL query string parameter based on the selected value from the dropdown. This is useful for sharing URLs with the component state. Defaults to false.

countries

restricts predictions to specified country (ISO 3166-1 Alpha-2 country code, case insensitive). For example, 'us', 'in', or 'au'. You can provide an array of up to five country code strings.

serviceOptions

allows to add more options to AutoCompletionRequest, available from Google Places library

renderItem

customize the rendered list via a function which receives the item label, count & isSelected and expects a JSX or String back. For example:

renderItem={(label, isSelected) => (
    <div>
        <span style={{
            marginLeft: 5, color: isSelected ? 'red' : 'dodgerblue'
        }}>
            {label}
        </span>
    </div>
)}

render

an alternative callback function to renderItem, where user can define how to render the view based on all the data changes.
It accepts an object with these properties:

• loading: boolean

indicates that the query is still in progress

• error: object

An object containing the error info

• data: array

An array of results obtained from the applied query.

• rawData object

An object of raw response as-is from elasticsearch query.

• value: array

current selected value.

• handleChange: function

A callback function can be used to mark the list value as selected.

• downshiftProps: object

provides all the control props from downshift which can be used to bind list items with click/mouse events. Read more about it here.

  <GeoDistanceDropdown
    render={({ loading, error, data, handleChange, downshiftProps }) => {
      if (loading) {
        return <div>Fetching Results.</div>;
      }
      if (error) {
        return <div>Something went wrong! Error details {JSON.stringify(error)}</div>;
      }
      if(downshiftProps.isOpen === false){
        return null;
      }
      return data.map(item => (
        <div onClick={() => handleChange(item)} key={item.label}>
          <span>{item.label}</span>
          <span>{item.distance}</span>
        </div>
      ));
    }}
  />

Or you can also use render function as children

<GeoDistanceDropdown>
        {
            ({
                loading,
                error,
                data,
                value,
                handleChange,
                downshiftProps
            }) => (
                // return UI to be rendered
            )
        }
</GeoDistanceDropdown>

onData

gets triggered after data changes, which returns an object with these properties: value & error.

  onData={
    (prop) => {
      const {value, error} = prop;
      // do something
    }
  }

Demo

Styles

GeoDistanceDropdown component supports innerClass prop with the following keys:

• title
• input
• list
• select
• icon
• count

Read more about it here.

Extending

GeoDistanceDropdown component can be extended to

1. customize the look and feel with className, style,
2. update the underlying DB query with customQuery,
3. connect with external interfaces using beforeValueChange, onValueChange and onQueryChange.
4. specify how options should be filtered or updated using react prop.
5. add the following synthetic events to the underlying input element:
   • onBlur
   • onFocus
   • onKeyPress
   • onKeyDown
   • onKeyUp
   • autoFocus

<GeoDistanceDropdown
  // ...
  className="custom-class"
  style={{"paddingBottom": "10px"}}
  customQuery={
    function(location, distance, props) {
      return {
        // query in the format of Elasticsearch Query DSL
        geo_distance: {
          distance: distance + props.unit,
          location_dataField: location
        }
      }
    }
  }
  beforeValueChange={
    function(value) {
      // called before the value is set
      // returns a promise
      return new Promise((resolve, reject) => {
        // update state or component props
        resolve()
        // or reject()
      })
    }
  }
  onValueChange={
    function(value) {
      console.log("current value: ", value)
      // set the state
      // use the value with other js code
    }
  }
  onQueryChange={
    function(prevQuery, nextQuery) {
      // use the query with other js code
      console.log('prevQuery', prevQuery);
      console.log('nextQuery', nextQuery);
    }
  }
/>

className

CSS class to be injected on the component container.

style

CSS styles to be applied to the GeoDistanceDropdown component.

customQuery

takes location, distance and props as parameters and returns the data query to be applied to the component, as defined in Elasticsearch Query DSL.
Note: customQuery is called on value changes in the GeoDistanceDropdown component as long as the component is a part of react dependency of at least one other component.

beforeValueChange

is a callback function which accepts component's future value as a parameter and returns a promise. It is called every time before a component's value changes. The promise, if and when resolved, triggers the execution of the component's query and if rejected, kills the query execution. This method can act as a gatekeeper for query execution, since it only executes the query after the provided promise has been resolved.

onValueChange

is a callback function which accepts component's current value as a parameter. It is called every time the component's value changes. This prop is handy in cases where you want to generate a side-effect on value selection. For example: You want to show a pop-up modal with the valid discount coupon code when a user searches within a specific location area.

onQueryChange

is a callback function which accepts component's prevQuery and nextQuery as parameters. It is called everytime the component's query changes. This prop is handy in cases where you want to generate a side-effect whenever the component's query would change.

react

specify dependent components to reactively update GeoDistanceDropdown's options. Read more about it here.

• key String one of and, or, not defines the combining clause.
  • and clause implies that the results will be filtered by matches from all of the associated component states.
  • or clause implies that the results will be filtered by matches from at least one of the associated component states.
  • not clause implies that the results will be filtered by an inverse match of the associated component states.
• value String or Array or Object
  • String is used for specifying a single component by its componentId.
  • Array is used for specifying multiple components by their componentId.
  • Object is used for nesting other key clauses.

Examples

GeoDistance Dropdown with all the default props