Google Map with several markers are not displayed

Hello,
In laravel 5.8 app I add Google Map with several markers and I have empty block and no errors in console
and no map acttually is visible
In function with code:

frontendTimeline.prototype.initEventsListingMap = function () {

    console.log("this_mapEvents::")
    console.log( this_mapEvents )

    $("#div_map_wrapper").css("display","block")

    var map = new google.maps.Map(document.getElementById('div_map'), {
        zoom: 12,
        mapTypeControlOptions: {...

Code (JavaScript):

Google Map with several markers are not displayed

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