one selection tag automatically chosen

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import wixData from 'wix-data';

let dbField = "title"; //<---- change here the DATABASE-FIELD you want to use


$w.onReady(function() {
	let filter=wixData.filter();
	let mySelectecIndex =[0]; //<--- sets the selectionTag'S index to the first value
	$w("#mySelectedTags").selectedIndices=mySelectecIndex; //<--- 
	
	$w('#dataset1').onReady(()=> {
		$w('#selectionTags1').onChange(()=>{
			let selectedTags = $w('#selectionTags1').value; //<-- sets new value
			
			//function for ONE-SELECTION-ONLY.....
			for(var i=0; i<selectedTags.length-1; i++){
				if(selectedTags.length>1){
					selectedTags.shift();	
				}
				if(i===selectedTags.length-1){
					$w('#selectionTags1').value=[];
					$w('#selectionTags1').value=selectedTags;
			 		filter=filter.hasSome(dbField, selectedTags[0];
					$w('#dataset1').setFilter(filter);
			}
		}); 		
	});
 });