Q&A

• OS: Windows 10
• Browser: Edge, Chrome, Firefox
• Version: 86.x (Chrome), 82.x (Firefox)
• Method of installation: dist assets
• Swagger-UI version: 3.32.5, and Swagger Editor - Online
• Swagger/OpenAPI version: OpenAPI 3.0

Consider the below OpenAPI definition:

openapi: 3.0.1
info:
  title: Test Documentation
  version: 0.0.1-SNAPSHOT
servers:
- url: http://localhost:8080
paths:
  /endpoint:
    get:
      tags:
      - My Tag
      summary: Some GET request
      operationId: myoperation
      parameters:
      - name: parameter1
        in: query
        description: Dummy parameter
        content:
          application/json:
            schema:
              type: array
              items:
                type: string
                default: Active
                enum:
                - Active
                - Suspended
                - Deleted
              enum:
              - Active
              - Suspended
              - Deleted
      responses:
        "204":
          description: No content
          content:
            application/json: {}

Describe the bug you're encountering

The output is expected as shown below

The bug occurs when the below process is followed

1. Load the Swagger UI
2. Click on the Try it out
3. Click on Execute

Now, if your Network's tab is open in the browser developer tools, it's observed that there's no request initiated yet the Loading keeps running infinitely.

But if any one of the option is selected as shown below (and optionally immediately de-selected such that the screen looks like the previous one, as if the option was never selected)

and then the Execute button is hit, the request is actually made and also shows up in the Network monitor tab with a response being generated.

Expected behavior

The request should be initiated irrespective of the fact that an option is selected or not (provided it's not a required field).

Suggested Enhancement

It'll be a good idea to consider the default value from the OpenAPI spec and have the target value automatically selected.