限制预输入结果 [英] Limit typeahead results
问题描述
我正在使用 angular-ui typeahead 指令连接到 Google Maps API 并检索地址数组.通常，当我需要限制可见结果的数量时，我会执行以下操作:
I'm using the angular-ui typeahead directive to connect to the Google Maps API and retrieve an array of addresses. Normally when I need to limit the amount of results visible I do something like:
<input typeahead="eye for eye in array | filter:$viewValue | limitTo:10">
这很完美，结果被限制为 10.但是，当我尝试对异步结果做同样的事情时，它不起作用.它会给出比我在 limitTo 中指定的更多的结果.
That works perfectly and the results are limited to 10. However, when I try to do the same thing with asynchronous results, it doesn't work. It will give more results than I specified in the limitTo.
我在下面做错了什么吗?
Am I doing something incorrectly below?
HTML:
<input ng-model="asyncSelected" typeahead="address for address in getLocation($viewValue) | limitTo:1" typeahead-loading="loadingLocations">
JavaScript:
JavaScript:
$scope.getLocation = function(val) {
return $http.get('http://maps.googleapis.com/maps/api/geocode/json', {
params: {
address: val
}
}).then(function(res){
var addresses = [];
angular.forEach(res.data.results, function(item){
addresses.push(item.formatted_address);
});
return addresses;
});
};
目前我正在做以下解决方法，我只是好奇为什么简单的 limitTo 不起作用.
Currently i'm doing the following to workaround, i'm just curious why a simple limitTo doesn't work.
$scope.getLocation = function(val) {
return $http.get('http://maps.googleapis.com/maps/api/geocode/json', {
params: {
address: val
}
}).then(function(res){
var addresses = [];
var resultNumber = res.data.results.length > 5 ? 5 : res.data.results.length;
for(var i = 0; i < resultNumber; i++){
var obj = res.data.results[i];
var addr = obj.formatted_address;
addresses.push(addr);
}
return addresses;
});
};
推荐答案
typeahead 似乎不支持 promise.因此，最好将其绑定到一个集合，然后在收到来自 google 的响应时更新该集合.您可能想要考虑去抖动强硬，现在对输入的每个字母都进行请求.
typeahead doesn't seem to support promises. So it's better to just bind it to a collection, and then update that collection when you get a response from google. You might want to think about debouncing tough, now a request is done for every letter typed.
请注意，您也不再需要过滤器，因为过滤器已经由谷歌服务器端完成.
Note that you also don't need the filter anymore, because the filter is already being done by google sever side.
http://plnkr.co/edit/agwEDjZvbq7ixS8El3mu?p=preview
var app = angular.module('app',['ui.bootstrap']);
app.controller('Ctrl', ['$scope','$http', function($scope,$http){
$scope.locations = [];
$scope.$watch('asyncSelected', function(val) {
$http.get('http://maps.googleapis.com/maps/api/geocode/json', {
params: {
address: val
}
}).then(function(res){
$scope.locations.length = 0;
angular.forEach(res.data.results, function(item){
$scope.locations.push(item.formatted_address);
});
});
});
}]);
<head>
<link data-require="bootstrap-css@~3.1.1" data-semver="3.2.0" rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" />
<script data-require="angular.js@*" data-semver="1.3.0-beta.5" src="https://code.angularjs.org/1.3.0-beta.5/angular.js"></script>
<script data-require="ui-bootstrap@*" data-semver="0.11.0" src="http://angular-ui.github.io/bootstrap/ui-bootstrap-tpls-0.11.0.min.js"></script>
<script data-require="jquery@*" data-semver="2.1.1" src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script data-require="bootstrap@*" data-semver="3.1.1" src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="style.css" />
<script src="script.js"></script>
</head>
<body ng-app="app" ng-controller="Ctrl">
<input type="text" ng-model="asyncSelected" placeholder="Address" typeahead="address for address in locations | limitTo:1" typeahead-loading="loadingLocations" class="form-control">
</body>
</html>
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