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How to design conditional drop-down select lists in your interactive prototypes

Build conditional drop down lists in your interactive prototypes with the help of conditions.

With this tutorial you will learn how to change the content of a drop-down select list according to which value the user has selected in another one.

drop down

1) In a new mobile prototype, drag two select list widgets to the canvas.

2) Select the first select list and go to Properties (or right-click on it). Click on “Edit values” to edit its values.

Edit properties of your select list in your UI prototypes

3) Delete the default values  and in their place type names of countries. Click OK.

Edit values in select list in your UI prototype

4) Select the first select list, go to the Events tab and click on ‘Add event’.

5) Click on the first list and add an ‘On change’ + ‘Set Value’ event. Then add the names of one of the country’s cities as fixed values. Click OK.

Add events to the select list in your UI prototype

6) In the events tab, click on “Add Condition“. In the condition builder, drag the drop-down with the names of the countries to the first dotted box. Then drag the “=” function located in the General functions tab. Finally, double click on the second dotted box and enter “USA”.

Add an expression to a select list event in your UI prototype

7) Click OK. In the Events tab, you will see the description of the event you have just built.

We have indicated that the three US cities should only be displayed if the USA is clicked on in the other drop-down list

By clicking on the text “Else add condition”, you can define the other cases just as you did with the first one.

Click on Simulate to verify that each time you change a value in the Country drop-down, the right cities are loaded in the other drop-down list.

Next tutorial >  Simulate an advanced slideshow in your interactive prototypes


  1. Jordan

    October 5, 2015 at 7:14 pm

    Can you add more than 3 values to your lists?

    • Danielle Schneider

      October 6, 2015 at 4:02 am

      Yes – you can add as many values as you would like.