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# jQuery UI API - .uniqueId() ## Category (#) | (#) ## Usage **Description:** Generates and applies a unique ID to the set of matched elements. **Returns:** (http://api.jquery.com/Types/#jQuery) **Added in version:** 1.9 .uniqueId() This method does not accept any arguments. Many widgets require elements to have unique IDs. `.uniqueId()` checks if an element has an ID; if it does not, it generates one and sets it as the element's ID. It is safe to call `.uniqueId()` without first checking if the element has an ID. When a widget needs to be cleaned up after use, if the ID was added via `.uniqueId()`, the `.removeUniqueId()` method will remove the ID from the element. If the ID was not added via `.uniqueId()`, it will have no effect. `.removeUniqueId()` can distinguish IDs because those generated by `.uniqueId()` are prefixed with `"ui-id-"`.