/**
* @module webgis4u/ol/util/getMapChildElementByClassName
*/
/**
* @typedef GetMapChildElementByClassNameOptions
* @type {object}
* @property {ol.Map} map The map
* @property {string} className The class name
*/
/**
* Retruns an element selected by its class name
* @param {GetMapChildElementByClassNameOptions} options The options
*
* @returns {HTMLElement|null} The first HTML element that fits the class selector or null
*/
export function getMapChildElementByClassName(options) {
const { map, className } = options;
if (!map) { return null; }
const mapElement = map.getTargetElement();
const elementsInMapDOM = mapElement.getElementsByClassName(className);
if (elementsInMapDOM.length < 1) { return null; }
return elementsInMapDOM[0];
}