How does it work?

SearchComponent component represents a search component that can be used to build different kinds of search components. It uses the SearchComponent class from SearchBase to integrate the UI components with Elasticsearch. Some of the use-cases are:

  • a category filter component,
  • a search bar component,
  • a price range component,
  • a location filter component,
  • a component to render the search results etc.

Props

Configure appbase.io environment

The below props are only needed if you're not using the SearchComponent component under SearchBase provider. These props can also be used to override the global environment defined in the SearchBase component.

  • index string [Required] Refers to an index of the Elasticsearch cluster.

    Note: Multiple indexes can be connected to by specifying comma-separated index names.

  • url string [Required] URL for the Elasticsearch cluster

  • credentials string [Required] Basic Auth credentials if required for authentication purposes. It should be a string of the format username:password. If you are using an appbase.io cluster, you will find credentials under the Security > API credentials section of the appbase.io dashboard. If you are not using an appbase.io cluster, credentials may not be necessary - although having open access to your Elasticsearch cluster is not recommended.

  • appbaseConfig Object allows you to customize the analytics experience when appbase.io is used as a backend. It accepts an object which has the following properties:

    • recordAnalytics boolean allows recording search analytics (and click analytics) when set to true and appbase.io is used as a backend. Defaults to false.
    • enableQueryRules boolean If false, then appbase.io will not apply the query rules on the search requests. Defaults to true.
    • userId string It allows you to define the user id to be used to record the appbase.io analytics. Defaults to the client's IP address.
    • customEvents Object It allows you to set the custom events which can be used to build your own analytics on top of appbase.io analytics. Further, these events can be used to filter the analytics stats from the appbase.io dashboard.
    • enableTelemetry Boolean When set to false, disable the telemetry. Defaults to true.

To configure the ReactiveSearch API

The following properties can be used to configure the appbase.io ReactiveSearch API:

  • id string [Required] unique identifier of the component, can be referenced in other components' react prop.

  • type string This property represents the type of the query which is defaults to search, valid values are search, term, range & geo. You can read more here.

  • dataField string | Array<string | DataField> index field(s) to be connected to the component’s UI view. SearchBox accepts an Array in addition to string, which is useful for searching across multiple fields with or without field weights.
    Field weights allow weighted search for the index fields. A higher number implies a higher relevance weight for the corresponding field in the search results.
    You can define the dataField property as an array of objects of the DataField type to set the field weights.
    The DataField type has the following shape:

    type DataField = {
        field: string;
        weight: number;
    };
    
  • value any Represents the value for a particular query type. Depending on the query type, the value format would differ. You can refer to the different value formats over here.

  • queryFormat string Sets the query format, can be or or and. Defaults to or.

    • or returns all the results matching any of the search query text's parameters. For example, searching for "bat man" with or will return all the results matching either "bat" or "man".
    • On the other hand with and, only results matching both "bat" and "man" will be returned. It returns the results matching all of the search query text's parameters.
  • react Object react prop is useful for components whose data view should reactively update when on or more dependent components change their states, e.g. a component to display the results can depend on the search component to filter the results.

    • 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 id.
      • Array is used for specifying multiple components by their id.
      • Object is used for nesting other key clauses.

An example of a react clause where all three clauses are used and values are Object, Array and string.

<SearchComponent
    id="result-component"
    dataField={["original_title", "original_title.search"]}
    react={{
        and: {
            or: ['CityComp', 'TopicComp'],
            not: 'BlacklistComp',
        },
    }}
/>

Here, we are specifying that the results should update whenever one of the blacklist items is not present and simultaneously any one of the city or topics matches.

  • size number Number of suggestions and results to fetch per request.

  • from number To define from which page to start the results, it is important to implement pagination.

  • includeFields Array<string> fields to be included in search results.

  • excludeFields Array<string> fields to be excluded in search results.

  • sortBy string sort the results by either asc or desc order.

  • aggregationField string [optional] One of the most important use-cases this enables is showing DISTINCT results (useful when you are dealing with sessions, events, and logs type data). It utilizes composite aggregations which are newly introduced in ES v6 and offer vast performance benefits over a traditional terms aggregation. You can read more about it over here. You can use aggregationData using onAggregationData callback or subscriber.

<SearchComponent
    id="search-component"
    dataField={["original_title", "original_title.search"]}
    aggregationField="original_title.keyword"
    onAggregationData={(next, prev) => {}}
/>
  • aggregationSize To set the number of buckets to be returned by aggregations.

    Note: This is a new feature and only available for appbase versions >= 7.41.0.

  • highlight boolean [optional] whether highlighting should be enabled in the returned results.

  • highlightField string or Array [optional] when highlighting is enabled, this prop allows specifying the fields which should be returned with the matching highlights. When not specified, it defaults to applying highlights on the field(s) specified in the dataField prop.

  • customHighlight Object [optional] It can be used to set the custom highlight settings. You can read the Elasticsearch docs for the highlight options at here.

  • categoryField string [optional] Data field which has the category values mapped.

  • categoryValue string [optional] This is the selected category value. It is used for informing the search result.

  • nestedField string set the nested field path that allows an array of objects to be indexed in a way that can be queried independently of each other. Applicable only when dataField's mapping is of nested type.

  • fuzziness string | number Set a maximum edit distance on the search parameters, which can be 0, 1, 2, or "AUTO". This is useful for showing the correct results for an incorrect search parameter by taking the fuzziness into account. For example, with a substitution of one character, the fox can become a box. Read more about it in the elastic search docs

  • enableSynonyms: boolean This property can be used to control (enable/disable) the synonyms behavior for a particular query. Defaults to true, if set to false then fields having .synonyms suffix will not affect the query.

  • searchOperators boolean Defaults to false. If set to true, then you can use special characters in the search query to enable the advanced search.
    Read more about it here.

  • queryString boolean [optional] Defaults to false. If set to true than it allows you to create a complex search that includes wildcard characters, searches across multiple fields, and more. Read more about it here.

  • pagination: boolean This property allows you to implement the pagination for term type of queries. If pagination is set to true then appbase will use the composite aggregations of Elasticsearch instead of terms aggregations.

  • after: Object This property can be used to implement the pagination for aggregations. We use the composite aggregations of Elasticsearch to execute the aggregations' query, the response of composite aggregations includes a key named after_key which can be used to fetch the next set of aggregations for the same query. You can read more about the pagination for composite aggregations at here.

    You need to define the after property in the next request to retrieve the next set of aggregations.

  • showMissing: boolean Defaults to false. When set to true then it also retrieves the aggregations for missing fields.

  • missingLabel: string Defaults to N/A. It allows you to specify a custom label to show when showMissing is set to true.

  • includeNullValues: boolean If you have sparse data or documents or items not having the value in the specified field or mapping, then this prop enables you to show that data.

  • interval: number To set the histogram bar interval, applicable when aggregations value is set to ["histogram"]. Defaults to Math.ceil((range.end - range.start) / 100) || 1.

  • aggregations: Array It helps you to utilize the built-in aggregations for range type of queries directly, valid values are:

  • max: to retrieve the maximum value for a dataField,

  • min: to retrieve the minimum value for a dataField,

  • histogram: to retrieve the histogram aggregations for a particular interval

  • selectAllLabel: string This property allows you to add a new property in the list with a particular value in such a way that when selected i.e value is similar/contains to that label(selectAllLabel) then term query will make sure that the field exists in the results.

  • distinctField String [optional] This prop returns only the distinct value documents for the specified field. It is equivalent to the DISTINCT clause in SQL. It internally uses the collapse feature of Elasticsearch. You can read more about it over here.

  • distinctFieldConfig Object [optional] This prop allows specifying additional options to the distinctField prop. Using the allowed DSL, one can specify how to return K distinct values (default value of K=1), sort them by a specific order, or return a second level of distinct values. distinctFieldConfig object corresponds to the inner_hits key's DSL. You can read more about it over here.

<SearchComponent
    ....
    distinctField="authors.keyword"
    distinctFieldConfig={{
        inner_hits: {
            name: 'most_recent',
            size: 5,
            sort: [{ timestamp: 'asc' }],
        },
        max_concurrent_group_searches: 4,
    }}
/>

To customize the AutoSuggestions

  • enablePopularSuggestions boolean [optional] Defaults to false. When enabled, it can be useful to curate search suggestions based on actual search queries that your users are making. Read more about it over here.

  • showDistinctSuggestions boolean [optional] Show 1 suggestion per document. If set to false multiple suggestions may show up for the same document as the searched value might appear in multiple fields of the same document, this is true only if you have configured multiple fields in dataField prop. Defaults to true.

    Example if you have showDistinctSuggestions is set to false and have the following configurations

    // Your document:
    {
        "name": "Warn",
        "address": "Washington"
    }
    // SearchComponent:
    dataField=['name', 'address']
    // Search Query:
    "wa"
    

    Then there will be 2 suggestions from the same document as we have the search term present in both the fields specified in dataField.

    Warn
    Washington
    

Callbacks for change events

  • onValueChange Function 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 for a product in a SearchBox.

  • onError Function gets triggered in case of an error while fetching results

  • onResults Function can be used to listen for the results changes

  • onQueryChange Function 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.

  • onAggregationData Function can be used to listen for the aggregationData property changes

    • data: Array<Object> contains the parsed aggregations
    • raw: Object Response returned by ES composite aggs query in the raw form.
    • rawData: Object An object of raw response as-is from elasticsearch query.
    • afterKey: Object If the number of composite buckets is too high (or unknown) to be returned in a single response use the afterKey parameter to retrieve the next
  • onRequestStatusChange Function can be used to listen for the request status changes

  • onMicStatusChange Function can be used to listen for the mic status changes

To customize the query execution

  • headers Object set custom headers to be sent with each server request as key/value pairs. For example:
<SearchComponent
    id="search-component"
    dataField={["original_title", "original_title.search"]}
    headers={{
        secret: 'searchbase-is-awesome',
    }}
/>
  • transformRequest (requestOptions: Object) => Promise<Object> Enables transformation of network request before execution. This function will give you the request object as the param and expect an updated request in return, for execution.
    For example, we will add the credentials property in the request using transformRequest.
<SearchComponent
    id="search-component"
    dataField={["original_title", "original_title.search"]}
    transformRequest= {request =>
        Promise.resolve({
            ...request,
            credentials: include,
        })
    }
/>
  • transformResponse (response: any) => Promise<any> Enables transformation of search network response before rendering them. It is an asynchronous function which will accept an Elasticsearch response object as param and is expected to return an updated response as the return value.
    For example:
<SearchComponent
    id="search-component"
    dataField={["original_title", "original_title.search"]}
    transformResponse={async elasticsearchResponse => {
        const ids = elasticsearchResponse.hits.hits.map(item => item._id);
        const extraInformation = await getExtraInformation(ids);
        const hits = elasticsearchResponse.hits.hits.map(item => {
            const extraInformationItem = extraInformation.find(
                otherItem => otherItem._id === item._id,
            );
            return {
                ...item,
                ...extraInformationItem,
            };
        });

        return {
            ...elasticsearchResponse,
            hits: {
                ...elasticsearchResponse.hits,
                hits,
            },
        };
    }}
/>

Note

transformResponse function is expected to return data in the following structure.

    {
        // Elasticsearch hits response
        hits: {
            hits: [...],
            total: 100
        },
        // Elasticsearch aggregations response
        aggregations: {

        }
        took: 1
    }
  • defaultQuery: (component: SearchComponent) => Object is a callback function that takes the SearchComponent instance as parameter and returns the data query to be applied to the source component, as defined in Elasticsearch Query DSL, which doesn't get leaked to other components. In simple words, defaultQuery is used with data-driven components to impact their own data. It is meant to modify the default query which is used by a component to render the UI.

    Some of the valid use-cases are:

    • To modify the query to render the suggestions or results in search type of components.
    • To modify the aggregations in term type of components.

    For example, in a term type of component showing a list of cities, you may only want to render cities belonging to India.

<SearchComponent
    id="city-component"
    type="term"
    dataField={["city"]}
    defaultQuery={() => (
        {
            query: {
                terms: {
                    country: ['India'],
                },
            },
        }
    )}
/>
  • customQuery: (component: SearchComponent) => Object takes SearchComponent instance as parameter and returns the query to be applied to the dependent components by react prop, as defined in Elasticsearch Query DSL.

    For example, the following example has two components search-component(to render the suggestions) and result-component(to render the results). The result-component depends on the search-component to update the results based on the selected suggestion. The search-component has the customQuery prop defined that will not affect the query for suggestions(that is how customQuery is different from defaultQuery) but it'll affect the query for result-component because of the react dependency on search-component.

<SearchBase
    index="gitxplore-app"
    url="https://@arc-cluster-appbase-demo-6pjy6z.searchbase.io"
    credentials="a03a1cb71321:75b6603d-9456-4a5a-af6b-a487b309eb61"
/>
    <SearchComponent
        id="search-component"
        dataField={["original_title", "original_title.search"]}
        customQuery={
            () => ({
                timeout: '1s',
                query: {
                    match_phrase_prefix: {
                        fieldName: {
                            query: 'hello world',
                            max_expansions: 10,
                        },
                    },
                },
            })
        }
    />
    <SearchComponent
        id="result-component"
        dataField="original_title"
        react={{
            and: ['search-component']
        }}
    />

Miscellaneous

  • beforeValueChange Function 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. For example:
<SearchComponent
    id="search-component"
    dataField={["original_title", "original_title.search"]}
    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()
            });
        }
    }
/>
  • URLParams Boolean enable creating a URL query string param based on the search query value. This is useful for sharing URLs with the component state. Defaults to false.

  • subscribeTo Array<string> lets you subscribe to various SearchComponent properties to render UI (or to create a side-effect) based on changes to the properties.
    These are the properties that can be subscribed to:

    • results
    • aggregationData
    • requestStatus
    • error
    • value
    • query
    • micStatus
    • dataField
    • size
    • from
    • fuzziness
    • includeFields
    • excludeFields
    • sortBy
    • react
    • defaultQuery
    • customQuery

      Render UI

      You can use the render prop (or child) as function to render your custom UI. The following properties are available in the render function.

Getters

  • loading: boolean indicates that the query is still in progress.

  • error: Object An object containing the error info.

  • results Results It is an object which contains the following details of suggestions query response.

    • data: Array<Object> contains the (promoted data + parsed hits)
    • raw: Object Response returned by ES query in the raw form.
    • numberOfResults: number Total number of results found
    • time: number Total time taken by request (in ms)
    • hidden: number Total number of hidden results found
    • promoted: number Total number of promoted results found
    • promotedData: Array<Object> An array of promoted results obtained from the applied query.
    • customData: Object An object of custom data obtained from the ReactiveSearch API.
    • rawData: Object An object of raw response as-is from elasticsearch query.
  • suggestions () => Array<Object> This method can be used to get the parsed suggestions from the results. If enablePopularSuggestions property is set to true then the popular suggestions will get appended at the top with a top-level property named _popular_suggestion as true. The suggestion object will have the following shape:

{
    label: string;
    value: string;
    source: Object;
}
  • aggregationData Aggregations It is an object which contains the following details of aggregations query response.

    • data: Array<Object> contains the parsed aggregations
    • raw: Object Response returned by ES composite aggs query in the raw form.
    • rawData: Object An object of raw response as-is from elasticsearch query.
    • afterKey: Object If the number of composite buckets is too high (or unknown) to be returned in a single response use the afterKey parameter to retrieve the next results. This property will only be present for composite aggregations.
  • value any Represents the current value of the component

  • query Object The last query that has been executed by the component

  • micStatus MicStatusField Returns the current status of the mic. Can be INACTIVE, ACTIVE or DENIED

  • micActive boolean Returns true if mic is active

  • micInactive boolean Returns true if mic is inactive

  • micDenied boolean Returns true if it doesn't have access to the mic

  • micInstance Object Returns the current mic instance. Can be used to set mic language and other properties of mic

  • id string as defined in props

  • react Object react as defined in props

  • queryFormat string as defined in props

  • dataField string | Array<string | DataField> as defined in props

  • categoryField string as defined in props

  • categoryValue string represents the current value of the selected category

  • nestedField string as defined in props

  • from number represents the current state of the from value. This property is useful to implement pagination.

  • size number represents the current state of the size of results to be returned by query

  • sortBy string current state of the sortBy value

  • aggregationField string as defined in props

  • includeFields Array<string> represents the current value of includeFields property

  • excludeFields represents the current value of excludeFields property

  • fuzziness string|number represents the current value of fuzziness property

  • searchOperators boolean as defined in props

  • highlight boolean as defined in props

  • highlightField string|Array<string> as defined in props

  • customHighlight Object as defined in props

  • enableSynonyms boolean as defined in props

  • queryString string as defined in props

  • enablePopularSuggestions boolean as defined in props

  • showDistinctSuggestions boolean as defined in props

  • defaultQuery represents the current value of defaultQuery property

  • customQuery represents the current value of customQuery property

  • requestStatus represents the current state of the request, can have values as INACTIVE, PENDING or ERROR.

  • appbaseConfig Object as defined in props

  • queryId string to get the query id returned by appbase.io search to track the analytics

Setters

Note: All of the methods accept options as the second parameter which has the following shape:

{
    triggerDefaultQuery?: boolean, // defaults to `true`
    triggerCustomQuery?: boolean, // defaults to `false`
    stateChanges?: boolean // defaults to `true`
};
  • triggerDefaultQuery true executes the query for a particular component
  • triggerCustomQuery true executes the query for the dependent components (dependencies defined in the react property)
  • stateChanges true invokes the subscribed functions to subscribeToStateChanges method, i.e trigger the re-render after making changes

The following methods can be used to set or update the properties in the search state:

  • setValue ( value: any, options?: Options ) => void can be used to set the value property

  • setSize ( size: number, options?: Options ) => void can be used to set the size property

  • setFrom ( from: number, options?: Options ) => void can be used to set the from property. Useful to implement pagination.

  • setFuzziness ( fuzziness: string|number, options?: Options ) => void can be used to set the fuzziness property.

  • setIncludeFields ( includeFields: Array<string>, options?: Options ) => void can be used to set the includeFields property.

  • setExcludeFields ( excludeFields: Array<string>, options?: Options ) => void can be used to set the excludeFields property.

  • setSortBy ( sortBy: string, options?: Options ) => void can be used to set the sortBy` property.

  • setReact ( react: Object, options?: Options ) => void can be used to set the react property.

  • setDefaultQuery ( defaultQuery: function, options?: Options ) => void can be used to set the defaultQuery property.

  • setCustomQuery ( customQuery: function, options?: Options ) => void can be used to set the customQuery property.

  • handleMicClick (micOptions: Object, options: Options): Promise<any> can be used to handle the custom voice search implementation

  • setDataField ( dataField: string | Array<string | DataField>, options?: Options ) => void

Methods to trigger queries programmatically

Note: All of the methods accept options as the second parameter which has the following shape:

{
    stateChanges?: boolean // defaults to `true`
};
  • stateChanges true invokes the subscribed functions to subscribeToStateChanges method, i.e trigger the re-render after making changes

The following methods can be used to execute the component's queries programmatically.

  • triggerDefaultQuery (options): Promise<any> can be used to trigger the customQuery programmatically
  • triggerCustomQuery (options): Promise<any> can be used to trigger the defaultQuery programmatically

Methods to subscribe to state changes

  • subscribeToStateChanges function can be used to subscribe to the changes for the properties. Read more at here.
  • unsubscribeToStateChanges function can be used to unsubscribe to the changes for the properties. Read more at here.

Record Analytics

  • recordClick function enables recording click analytics of a search request. Please check the usage at here.
  • recordConversions function enables recording conversions of a search request. Please check the usage at here.