发现当谷歌的地方自动完成返回零结果(Find when google places autocomp

2019-09-17 01:24发布

我用的是谷歌的地方自动完成对地方的建议。 现在,这就是我想要的:当不是在谷歌的数据库的位置,用户类型,即谷歌返回零分的结果,我需要能够捕捉到的零个结果的事件,并触发我的custome自动完成。

如何找到当谷歌将返回结果为零? autocomplete.getPlace()将返回一个状态,如果有任何结果,但是这是place_changed事件,仅当用户从下拉列表中建议解雇内。 如何使之成为place_changed事件外面工作?

这是我用的,请给在此基础上建议的代码:

autocomplete = new google.maps.places.Autocomplete(input,options);
google.maps.event.addListener(autocomplete, 'place_changed', function() {
   var place = autocomplete.getPlace();
   document.getElementById('place_name').value = place.name;
   document.getElementById('location_lat').value = place.geometry.location.lat();
   document.getElementById('location_lon').value = place.geometry.location.lng();
   document.getElementById('location_add').value = place.formatted_address;
   $('#locationInput').attr('title', place.formatted_address);
});

Answer 1:

发现一招,

AutoComplete触发了keyup输入节点,那么事件:

隐藏结果通过下拉列表display: none; 如果没有结果

要么

显示结果下拉列表中有明确display风格,如果有结果

你可以得到下拉列表document.getElementsByClassName('pac-container')[0]本机)或$('.pac-container') (jQuery的)

所以刚才设置的display下拉列表中,以“块”然后跟踪其检测结果状态。

从修改一个简单的示例谷歌官方样片 :

<!DOCTYPE html>
<html>
    <head>
        <title>Google Maps JavaScript API v3 Example: Places Autocomplete</title>
        <script src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"
            type="text/javascript"></script>

        <style type="text/css">
            body {
                font-family: sans-serif;
                font-size: 14px;
            }
            #map_canvas {
                height: 400px;
                width: 600px;
                margin-top: 0.6em;
            }
        </style>

        <script type="text/javascript">
            var ns = {}; // a name space
            ns.checktimes = 0; // a couter of check times
            // the check function
            // @param dropdown: the drop-down list of Places.AutoComplete
            // @param msg: the div to show message
            ns._doCheck = function (dropdown, msg) {
                if (dropdown.style.display == '') {
                    msg.innerHTML = 'has results? true';
                    ns.checkTimer = null;
                }
                else if (dropdown.style.display == 'none') {
                    msg.innerHTML = 'has results? false';
                    ns.checkTimer = null;
                } else if (ns.checktimes < 20) { // check at most 10 seconds
                    ns.checktimes++;
                    ns.checkTimer = setTimeout(function () {
                        ns._doCheck(dropdown, msg);
                    }, 500);
                }
            }
            function initialize() {
                var mapOptions = {
                    center: new google.maps.LatLng(-33.8688, 151.2195),
                    zoom: 13,
                    mapTypeId: google.maps.MapTypeId.ROADMAP
                };
            var map = new google.maps.Map(document.getElementById('map_canvas'),
                mapOptions);

            var input = document.getElementById('searchTextField');
            var autocomplete = new google.maps.places.Autocomplete(input);

            autocomplete.bindTo('bounds', map);

            var infowindow = new google.maps.InfoWindow();
            var marker = new google.maps.Marker({
                map: map
            });

            google.maps.event.addListener(autocomplete, 'place_changed', function() {
                infowindow.close();
                var place = autocomplete.getPlace();
            if (place.geometry.viewport) {
                map.fitBounds(place.geometry.viewport);
            } else {
                map.setCenter(place.geometry.location);
                map.setZoom(17);  // Why 17? Because it looks good.
            }

            var image = new google.maps.MarkerImage(
                place.icon,
                new google.maps.Size(71, 71),
                new google.maps.Point(0, 0),
                new google.maps.Point(17, 34),
                new google.maps.Size(35, 35));
            marker.setIcon(image);
            marker.setPosition(place.geometry.location);

            var address = '';
            if (place.address_components) {
                address = [(place.address_components[0] &&
                place.address_components[0].short_name || ''),
                (place.address_components[1] &&
                place.address_components[1].short_name || ''),
                (place.address_components[2] &&
                place.address_components[2].short_name || '')
                ].join(' ');
            }

            infowindow.setContent('<div><strong>' + place.name + '</strong><br>' + address);
            infowindow.open(map, marker);
            // update stored value
            ns.oldValue = document.getElementById('searchTextField').value;
        });

        // Sets a listener on a radio button to change the filter type on Places
        // Autocomplete.
        function setupClickListener(id, types) {
            var radioButton = document.getElementById(id);
            google.maps.event.addDomListener(radioButton, 'click', function() {
            autocomplete.setTypes(types);
            });
        }

        setupClickListener('changetype-all', []);
        setupClickListener('changetype-establishment', ['establishment']);
        setupClickListener('changetype-geocode', ['geocode']);
        }

        // to check whether responsee and has results
        function startCheck () {
            // the input node
            var inp = document.getElementById('searchTextField'),
                value = inp.value; // value of input node
            if (value && ns.oldValue != value) { // has value and changed, start check
                // drop-down list and message div
                var dropdown = document.getElementsByClassName('pac-container')[0],
                    msg = document.getElementById('msg');
                // trick! change style to display='block'
                dropdown.style.display = 'block';
                // update stored value
                ns.oldValue = value;
                // initiate checktimes
                ns.checktimes = 0;
                // clear previous timer if exists
                if (ns.checkTimer)
                    clearTimeout (ns.checkTimer);
                ns.checkTimer = setTimeout(function () {
                    ns._doCheck(dropdown, msg);
                }, 500);
            }
        }
        google.maps.event.addDomListener(window, 'load', initialize);
    </script>
    </head>
    <body>
        <div>
            <div id="msg">has results? </div>
            <input id="searchTextField" type="text" size="50" onkeyup="startCheck();">
            <input type="radio" name="type" id="changetype-all" checked="checked">
            <label for="changetype-all">All</label>

            <input type="radio" name="type" id="changetype-establishment">
            <label for="changetype-establishment">Establishments</label>

            <input type="radio" name="type" id="changetype-geocode">
            <label for="changetype-geocode">Geocodes</lable>
        </div>
        <div id="map_canvas"></div>
    </body>
</html>


Answer 2:

我觉得您的情况可能会比谷歌返回零个结果不同。 一个在你的问题的假设,即place_changed事件“时[中]用户从下拉列表中建议仅触发,”是不正确的。 从google.maps.places.Autocomplete事件文档place_changed

当可供用户选择一个地方组PlaceResult此事件被触发。 如果用户输入不是由控制建议并按下回车键地点的名称,一个place_changed事件将被解雇,其中包含name属性的用户输入,未使用指定的其他属性。

否则,谷歌应该返回你的结果,因为用户已经选择了在自动完成的下拉选项的结果之一。 如果用户直接进入不是什么推动你的情况下,不应该为结果为零检查只是涉及检查一个,一些或子集google.maps.places.PlaceResult属性,如:

  • 的: address_components数组google.maps.GeocoderAddressComponent小号
  • id
  • name
  • reference
  • types字符串数组(例如[ politicallocality ]或[ restaurantestablishment ])


Answer 3:

你可以得到这样的结果也是如此。 预测是什么谷歌地图回报阵列。

const displaySuggestions = (predictions, status) => {
      if (status !== google.maps.places.PlacesServiceStatus.OK) {
        if (status === 'ZERO_RESULTS') {
          alert('zero results found')
        }
        return;
      }
    };
    // you can create autocompleteService as variable outside the function as well
    const autocompleteService = new google.maps.places.AutocompleteService();
    // input is string of what user types 
    autocompleteService.getPlacePredictions({ input: input, types: ['address'] }, displaySuggestions);


文章来源: Find when google places autocomplete returns zero results