René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Weirdness when setting multiple-choice input options dynamically","articleBody":"From [a Zulip topic](https://imagesc.zulipchat.com/#narrow/stream/327236-ImageJ/topic/ChoiceWidget.20with.20listBox.20style.20doesn't.20work.20with.20setChoices) by @emilmelnikov:\r\n\r\n\u003cblockquote\u003e\r\n\r\nIn the following example, target should be a dropdown list populated with values derived from other inputs when they change, but target renders as a normal text field.\r\n\r\n```java\r\npublic class SampleCommand extends DynamicCommand {\r\n    @Parameter(label = \"Input\", callback = \"inputChanged\")\r\n    String input;\r\n\r\n    @Parameter(label = \"Target\", style = \"listBox\")\r\n    String target;\r\n\r\n    void inputChanged() {\r\n        MutableModuleItem\u003cString\u003e item = getInfo().getMutableInput(\"target\", String.class);\r\n        item.setChoices(Arrays.asList(\"one\", \"two\", \"three\"));\r\n    }\r\n}\r\n```\r\n\r\nIt works when choices = {\" \"} is passed to `@Parameter` with `listBox`. Note the single space: passing an empty string results in `NullPointerException`.\r\n\r\n\u003c/blockquote\u003e\r\n","author":{"url":"https://github.com/ctrueden","@type":"Person","name":"ctrueden"},"datePublished":"2023-09-11T19:23:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/470/scijava-common/issues/470"}