How to get Swagger UI's Parameter to be Dropdown menu instead of Text Input

Question

I am using swagger to display my RESTApi, one parameter of an API takes string as input and convert it to enum value. Is there any way to display a drop-down menu on the Swagger UI instead of having a text input field so that users can only select the string values within the enum value.

Answer 1

you can display dropdown using following code of swagger. You have to use enum. e.g. if you want to take gender as input then there can be three possible values

• male, female, other

-name: "gender"
          in: "query"
          type: "string"
          enum: [ "male", "female", "other"]
          description: "Enter user gender here."
          required: true

Answer 2

The key is to use allowableValues in the @ApiParam annotation.

The demo showing the result:

http://petstore.swagger.io/#!/pet/findPetsByStatus

Check out pet/findByStatus, it's not a dropdown but input is limited in the multi-select box.

Answer 3

You can directly use enum instead of String parameter as a API parameter.

@RequestMapping(value = "/test", method = RequestMethod.POST)
public void test(EnumTest enum) {
    // body
}

EnumTest.java

public enum EnumTest {

    One("One"),
    Two("Two");

    private String str;

    EnumTest(String str){
       this.str = str;
    }

    public String getStr() {
       return str;
    }

}