In CartoDB (https://carto.com/)'s popup CustomHTML, can I use some logic like "If..then", "loop" or so?

I want to use it for usecase something like below:

  • Avoiding representation if attributes are null.
  • Showing all images if image url list is given.

Would you give me the information for such function in CustomHTML?

1 Answer 1


CARTO infowindows use Mustache templates to display the values of each point in the infowindows. You would need to go to the HTML version of the infowindow and write:

<h4>c_distri</h4> {{#c_distri}} <p>{{c_distri}}</p> {{/c_distri}} {{^c_distri}} <p>No value</p> {{/c_distri}}

  • For the example I'm using a random column named c_distri.

This is "telling" to CARTO:

1- If there is a value (not nulls or empty cells) in the column named c_distri, display the values of the column within HTML paragraph tags.

{{#c_distri}} <p>{{c_distri}}</p> {{/c_distri}} 2- If there is no value (nulls or empty cells) in the column named c_distri, display the message "No value" within HTML paragraph tags.

{{^c_distri}} <p>No value</p> {{/c_distri}}

The complete HTML code for the infowindow could be this one:

<div class="cartodb-popup v2">
  <a href="#close" class="cartodb-popup-close-button close">x</a>
  <div class="cartodb-popup-content-wrapper">
    <div class="cartodb-popup-content">

            <p>No value</p>

  <div class="cartodb-popup-tip-container"></div>

You can find detailed information about Mustache.js templates here.

  • Thank you!! That is exactly I want to have. But how can I access latitude/longitude of POI in template?
    – kochizufan
    Oct 6, 2016 at 12:51
  • I tried {{lat}} {{latitude}} {{the_geom.0}} {{the_geom.lat}} {{the_geom.latitude}} or so, but not works..
    – kochizufan
    Oct 6, 2016 at 13:50
  • it is not possible to display the coordinates from the_geom column in the infowindow. You could create a new column called" longitude" or "latitude" and populate it with the values from the longitude and latitude values from the_geom column. You could use SQL with the ST_X() and ST_Y() functions to extract the longitude and latitude values from the_geom column
    – oriolbx
    Oct 6, 2016 at 13:55
  • Thank you, I can extract them by SQL : SELECT *, ST_X(the_geom) as lng, ST_Y(the_geom) as lat FROM table_name
    – kochizufan
    Oct 6, 2016 at 14:31
  • yes or you could also create the new columns and then use a SQL UPDATE operation to populate those columns. For example: UPDATE tableName SET newColumn = ST_X(the_geom)
    – oriolbx
    Oct 6, 2016 at 14:33

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