dataSources

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dataSources Configuration

The dataSources section of main.js is where you enter APIs where you will get data and related records for an address.

The parameters for any data source include:

parameter	description or example
id	an id for the data source
type	one of the 4 data source types
url	the url endpoint
options	an object for adding details for the ajax call

|options|an object for adding details for the ajax call|

There are different kinds of dataSource retrievals:

• http-get
• http-get-nearby
• esri
• esri-nearby

For instance, Office of Property Assessment (OPA) data for the City of Philadelphia can be accessed through the API with the URL 'https://data.phila.gov/resource/w7rb-qrn8.json'. To make an 'ajax' call to this URL, you can create a dataSource (which you could call 'opa'), and give it a 'type' of 'http-get' (the generic type for a general 'ajax' call), and a 'url' of the URL above.

Further details about options for each type of dataSource retrieval are documented in the individual pages linked above.

Example:

dataSources: {
  // each source has a unique key, e.g. `opa`
  opa: {
    // the type of call to make
    type: 'http-get',
    // the base url of the api
    url: 'https://data.phila.gov/resource/w7rb-qrn8.json',
    // all options
    options: {
      // query string parameters to be added to the url
      params: {
        // each param is mapped to a function that gets passed the current
        // address feature. use attributes from this feature to form data queries.
        // in this case, a param of `?parcel_number=<opa_account_num>` will be
        // appended to the url.
        parcel_number: function (feature) { return feature.properties.opa_account_num; }
        },
      // a callback that unpacks the desired record(s) from the api. this
      // data will be kept in state and made available in the topic panel.
      success: function (data) {
        return data[0];
      }
    }
  }
},