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Showing content from https://developers.arcgis.com/documentation/mapping-and-location-services/geocoding/autosuggest/ below:

Autosuggest | Documentation | Esri Developer

Suggestions displayed as characters using a widget and the geocoding service.

Autosuggest, also known as autocomplete, is the process of using incomplete text to search for place names and addresses. For example, you can search for "New Y", "Dodgers S", and "Cali" to get a list of suggested place names that match.

You can use autosuggest to build applications that:

• Autocomplete addresses and places as you type.
• Provide a list of suggestions for incomplete address and place names.
• Refine place names and addresses to improve geocoding accuracy.

You can get address and place name suggestions by making an HTTP request to the geocoding service suggest operation or by using client APIs. Specify the address or place name text, and optionally, additional parameters to refine the search.

You can provide text for a partial place name or a partial address to get search results. Typically 2-3 characters are needed to start searching.

To refine the search and improve accuracy, you can provide additional information such as the location, search extent, category, and country code.

The geocoding service parses the text and uses all of the parameters provided to return a set of suggestions. Each suggestion contains text (address or place name), isCollection (single distinct place or multiple with the same name or category), and magicKey (search identifier) properties.

To get the complete address and location for a suggestion, you must make an additional request to the findAddressCandidates operation using the information from the suggestion.

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https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer/suggest?text={partialText}&f=json&token=<ACCESS_TOKEN>

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https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer/suggest?text={partialText}&f=json&token=<ACCESS_TOKEN>

To get an access token for this operation, go to Get started.

Additional parameters: Refine the search by using parameters such as location, searchExtent, category, and countryCode.

For more information about the request, parameters, and valid input values, see the Geocoding service REST API documentation.

Run the request in Postman .

This example finds suggestions for the string New Y. To find the actual address and location for a suggestion, you have to pass each text and magicKey value to the geocoding service. Most APIs provide a LocatorTask to access the service.

1. Reference the geocoding service.

2. Set the text to search for.

3. Set the API key.

The response is a set of suggestions (max of 5) containing the text and magicKey properties. Use these properties to search for the complete address with a location.

Suggestions displayed as characters using a widget and the geocoding service.

To get an access token, go to Security and Authentication > Get started.

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        const geocodingServiceUrl =
          "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer"

        const params = {
          text: "New Y", // Suggestion text
        }

        locator
          .suggestLocations(geocodingServiceUrl, params)
          .then((response) => {
            // Show a list of the suggestions
            response.forEach((suggestion) => {
              showSuggestion(suggestion.text, suggestion.magicKey)
            })
            // When a suggestion is selected, geocode to find its location
            select.addEventListener("calciteSelectChange", (event) => {
              const text = event.target.innerHTML
              const magicKey = event.target.value
              geocodeSuggestion(text, magicKey)
            })
          })

cURL cURL HTTP

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curl https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer/suggest \
-d 'f=pjson' \
-d 'text=New Y' \
-d 'token=<ACCESS_TOKEN>'

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{
  "suggestions": [
    {
      "text": "New York, NY, USA",
      "magicKey": "dHA9MCNsb2M9NzUwOTc4OCNsbmc9MzMjcGw9MjcxNjU1MyNsYnM9MTQ6MjM4MTIyMzc=",
      "isCollection": false
    },
    {
      "text": "New York, USA",
      "magicKey": "dHA9MCNsb2M9NzMxOTEwOCNsbmc9MzMjcGw9MjU5OTMyMyNsYnM9MTQ6MjM4MTIyMzc=",
      "isCollection": false
    },
    {

Search for an address with autosuggest using the geocoding service.

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