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It’s now possible to create dynamic questions, where child questions appear and disappear based on the selection made in the parent question and you can do this without writing any code.

undefinedundefined The implementation of dynamic questions takes advantage of Lightning Flow’s new ability, as of Spring ’18, to insert lightning components into flow screens. Using this, we’ve built a lightning component that produces dynamic questions upon request, and packaged it so that you can use it without touching code. Here are the steps to using a dynamic question in your Flow

  1. Make sure it’s installed in your org (and that your org is running Spring ’18 Salesforce)
  2. Create your Parent Question
  3. Configure your “Yes” child questions and your “No” child questions
  4. Setup some output variables to hold the user’s answers

Add a Dynamic Question to a Flow Screen

  1. Create a new flow and drag a screen element to the canvas.
  2. From the Add a Field tab, drag a Lightning Component field onto the design area.

 3. Link your lightning component field to the Dynamic Question lightning component.

Define your Parent Question

Your parent question must be a Yes/No question. It will appear as a radio button field. Specify the text for your parent question by adding the Parent Question Text attribute on the Inputs tab.

Specify Your “Yes” Child Questions and your “No” Child Questions

If you want one or more child questions to appear when the user clicks “Yes” on the parent question, define them by adding a “Dynamic “Yes” Fields” attribute to the Inputs tab.

For the value, list the child fields you want in the order you want them to appear under the parent question. Use shortcut tags to specify the fields you want and separate them with spaces. This string, for example:

cb1 tf1 rb3

will cause a checkbox to appear, followed by a text field and a radio button.

Each dynamic question can use up to 16 child elements, split between the “Yes” children and the “No” children. The 16 available elements are:

Tag Field Type tf1 text field tf2 text field tf3 text field tf4 text field cb1 checkbox field cb2 checkbox field cb3 checkbox field cb4 checkbox field rb1 radio button group field rb2 radio button group field rb3 radio button group field rb4 radio button group field lb1 drop-down list box field lb2 drop-down list box field lb3 drop-down list box field lb4 drop-down list box field

Configure Your Child Fields

You configure these fields by adding additional attributes to the Input tab of the dynamic question. Note that these are not configurable by and have no relationship to any fields created the traditional way in Cloud Flow Designer.

For every field you add, you need to add the corresponding label attribute and provide a label.

Radio button groups and Listbox groups additionally require you to provide information on the choices that those controls should present to the user. These are set in attributes called Options Input String fields. Here you need to provide a string that encodes all of the label information and also specify the name of the variable that will store the choice selected by the user. Here’s an example of the format:

“I’m the label for the first radio button choice”:”first”, “I’m the second radio button. Pick me instead!”: “second”

Set Default Values

You can set default values for the following elements:

ParentQuestion: this must be a STRING ‘yes’ or ‘no’.

RadioButtonGroup, TextField, ListBox: set in Flow to a string value or a string variable

Checkbox : set in Flow to a boolean value

Map Your User Output Data

Once the user has encountered your dynamic question and filled out or selected choices in the various fields, you’ll want to capture those answers and use them downstream in your flow. Do this on the Output tab by adding the appropriate Output Value attributes and mapping them to flow variables.

Troubleshooting

If you get this error message:A component error has occured :Uncaught Action failed: c:dynamicQuestionFSC$controller$init [Cannot read property ‘replace’ of undefined]Callback failed: serviceComponent://ui.interaction.runtime.components.controllers.FlowRuntimeController/ACTION$runInterviewmarkup://c:dynamicQuestionFSCFunction : “eval”

…the error is likely a misconfiguration of your Option Input Strings. They’re tricky. Look at the example above and make sure your quote marks, commas, and colons are all matched up properly.

Resources

Watch the video

Want to suggest an improvement or report a bug? Do that here. (https://github.com/alexed1/LightningFlowComponents/issues)

 Know a little javascript and want to add some improvements? Pull requests are welcome.