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;
$('#locationInput').attr('title', place.formatted_address);
});
发现一招,
AutoComplete
触发了keyup
输入节点,那么事件:
隐藏结果通过下拉列表display: none;
如果没有结果
要么
显示结果下拉列表中有明确display
风格,如果有结果
你可以得到下拉列表document.getElementsByClassName('pac-container')[0]
本机)或$('.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>
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
类事件文档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
- 该
types
字符串数组(例如[ political
, locality
]或[ restaurant
, establishment
])
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);