AngularUI-Bootstrap 的 Typeahead 无法读取 `undefined` 的 `length` 属性 [英] AngularUI-Bootstrap's Typeahead Can't Read `length` Property of `undefined`
问题描述
当我尝试使用承诺从 AngularUI-Bootstrap 获取预先输入的值时出现以下错误.
I am getting the following error when I attempt to get a typeahead values from AngularUI-Bootstrap, using a promise.
TypeError: Cannot read property 'length' of undefined
at http://localhost:8000/static/js/ui-bootstrap-tpls-0.6.0.min.js:1:37982
at i (http://localhost:8000/static/js/angular.min.js:79:437)
at i (http://localhost:8000/static/js/angular.min.js:79:437)
at http://localhost:8000/static/js/angular.min.js:80:485
at Object.e.$eval (http://localhost:8000/static/js/angular.min.js:92:272)
at Object.e.$digest (http://localhost:8000/static/js/angular.min.js:90:142)
at Object.e.$apply (http://localhost:8000/static/js/angular.min.js:92:431)
at HTMLInputElement.Va.i (http://localhost:8000/static/js/angular.min.js:120:156)
at HTMLInputElement.x.event.dispatch (http://localhost:8000/static/js/jquery-1.10.2.min.js:5:14129)
at HTMLInputElement.v.handle (http://localhost:8000/static/js/jquery-1.10.2.min.js:5:10866)
我的 HTML 标签是:
My HTML tag is:
<input type="text" class="form-control" id="guestName" ng-model="name" typeahead="name for name in getTypeaheadValues($viewValue)">
使用我的 getTypeaheadValues
函数执行以下操作:
With my getTypeaheadValues
function doing the following:
$scope.getTypeaheadValues = function($viewValue)
{
// return ['1','2','3','4'];
$http({
method: 'GET',
url: 'api/v1/person?name__icontains=' + $viewValue
}).error(function ($data) {
console.log("failed to fetch typeahead data");
}).success(function ($data) {
var output = [];
$data.objects.forEach(function (person)
{
output.push(person.name);
});
console.log(output);
return output;
});
}
我不明白 AngularUI-Bootstrap 抱怨什么未定义.如果我删除最顶部 return
上的注释,则值显示正常.success
中的 console.log
输出也返回我期望在数组中的所有值.
I do not understand what AngularUI-Bootstrap is complaining about as being undefined. If I remove the comment on the top-most return
the values show up fine. The console.log
output in the success
also return all the values I'm expecting in an array.
我遗漏了什么会导致 AngularUI-Bootstrap 看不到返回的数组?
What am I missing that would cause AngularUI-Bootstrap not see the returned array?
推荐答案
这个问题有两个方面.
首先是我没有返回 promise 事件($http
调用).缺少 return 语句(正如@tobo 指出的那样)是直接导致错误的原因.不过,我需要返回承诺,而不是数组.
The first is that I was not returning the promise event (the $http
call). The lack of a return statement (as @tobo points out) is what was causing the error directly. I needed to be returning the promise though, not the array.
第二个是我需要使用 .then
而不是 .success
来让 AngularUI-Bootstrap 获取结果.
The second is that I need to be using .then
rather than .success
for AngularUI-Bootstrap to pick up the results.
我遇到了以下问题:如何通过 $http 将 angular-ui 的预先输入与服务器绑定以进行服务器端优化?
将我的函数调用更新为以下内容:
Which updated my function call to the below:
$scope.getTypeaheadValues = function($viewValue)
{
return $http({
method: 'GET',
url: 'api/v1/person?name__icontains=' + $viewValue
}).then(function ($response) {
var output = [];
console.log($data);
$response.data.objects.forEach(function (person)
{
output.push(person.name);
});
console.log(output);
return output;
});
}
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