Function createChildIfNotExist

createChildIfNotExist(element: null | HTMLElement, tagName: string, className: string): void
Creates a child HTML element if it does not exist and adds it as child to the given element
Parameters
- element: null | HTMLElement
  
  the parent element
- tagName: string
  
  the tag name for the new child - e.g. div
- className: string
  
  a css class name for the new child
Returns void
- Defined in bgis/util/dom.ts:22

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