Getting Started with JMWE for Jira Cloud

How to validate field changes

When a user edits an issue, validate field value input - if it's wrong, show the message and roll back to the previous value

2M 30S

If important issue updates occur outside of status changes, you cannot validate field entries using workflow Validators. That's where our powerful Event-based Actions come in. It offers a collection of triggers that will kick off one or more of JMWE's post functions to automate processes outside of workflows. One of its triggers - Issue Field Value Change - will trigger an action when an issue field value changes.


For your convenience, the steps from the above video have been outlined below

When a user edits an issue, validate the field value input

Here is how to validate input when a user changes a field, and display an in-app message when the input doesn't follow the required format to alert the user. Even better - automatically revert to the previous value.

  • Go to Event-based Actions in the JMWE App administration.
  • Click on "New event-based action" to create this automation.
  • Give it a name, such as "Check value of man hours."
  • In the Event trigger, select "Issue Field Value Changed."
  • In Fields to monitor, select "Man hours" field to watch for changes and to validate.
  • Optional: Select any one or more Projects to apply this to. Leave blank if this applies to all projects globally.
  • Optional: You can also select issue types to which this action will apply.
  • In the Scope section, add conditional execution by checking "Only apply to issues that match a Nunjucks condition."
  • In the "Nunjucks condition" field, navigate to and expand the "Issue Fields" tab, select "Man hours" in the field dropdown.
  • Referred to the field either by Name or ID, click on it to select and insert the proper field - issue.fields["Man hours"] - into the value section. We suggest using field IDs instead of names in case the name is edited in the future.
  • In the "Nunjucks condition" section, add >10 (to represent "greater than 10") after the name or ID of the field.
  • Press "Add post function." We'll configure a post function to display an "error" message to users if the field value entered is greater than 10.
  • Add "Display Message to User" post-function.
  • Input information you want to appear to users if the "Man hours" field entry is greater than 10.
  • Optional: select message type "Warning" and check "Automatically close message."
  • Save the post function.
  • Again, "Add post function". We'll configure a post function to roll back the field to the previous value.
  • Select the "Set field value" post function, and configure it.
  • Select Field "Man hours."
  • Type the following Nunjucks expression into the Value field (this will set the previous field value; you can find all these snippets of code in our documentation):
{{issue | fieldHistory( "Man hours" ) | last | field("from_string")}}
  • Press "Save" to save the post function.
  • Press "Save" to save the Event-based Action.
  • All done.

See it all in action in the video above.

Last updated: 2023-02-01

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