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WATTS for Single Page Applications and Client Side Variations

If you are using WATTS with a Single-Page Application, you can use an API call to request WATTS data. By default, the SiteSpect SPA SDK pings SiteSpect asynchronously (using /__ssobj/asmt_update) when a change is applied to update assignment data. This ping also updates the counted state for a visit if the Client-Side Factor is set to Count User when Triggered. By default, the ping returns an empty body and a 204, but it can be used to return updated assignment and WATTS variables.

To configure this call, you can define the WATTS macros in a JSON structure for the AJAX response as follows:

  1. Select SiteConfigurationSite Settings.
  2. Select the Features tab.
  3. Scroll down until you see Client-Side WATTS Template. Use this text area to define your WATTS macros.

A callback function is called with the data in the response so that a data layer on the page can be updated with an updated assignment. The callback function name is defined via ss_dom_var.setAsmtCallback; we recommend that you define this function in the WATTS Site Variation.

An example of the WATTS JSON Structure in Site Features


How a rewrite of ss_dom_var.setAsmtCallback would look


If the callback function is not defined, the data from the response can be accessed from SS.getAsmtData().

The reference to ss_watts variable assumes that it has been defined at the window scope, Most clients declare this within the head tag like

<script>var ss_watts="__SS_LISTCAMPAIGNCOUNTED{__SS_TCID__:__SS_VGID__}{,}__";</script></head>

This declaration is generally referred to as the WATTS Site Variation noted above.