I want the id number of particular element like switch/toggle. To do database update based on the id number i want it.
Look in the properties panel for that element.
https://support.wix.com/en/article/corvid-working-with-the-properties-panel#targetText=If%20you%20are%20not%20already,bar,%20and%20selecting%20Properties%20Panel.
If you are talking about getting certain button values, then that all depends on what user input you are using on your page etc.
https://support.wix.com/en/article/about-your-database-collection-fields
https://support.wix.com/en/article/field-type-support-and-limitations-in-the-data-manager
https://support.wix.com/en/article/about-user-input-elements
https://support.wix.com/en/article/adding-and-setting-up-a-checkbox
https://support.wix.com/en/article/adding-and-setting-up-radio-buttons
https://support.wix.com/en/article/adding-and-setting-up-a-switch-element
https://www.wix.com/corvid/reference/$w.Checkbox.html
https://www.wix.com/corvid/reference/$w.CheckboxGroup.html
https://www.wix.com/corvid/reference/$w.RadioButtonGroup.html
https://www.wix.com/corvid/reference/$w.Switch.html