如何解决提前振颤
使用typeahead软件包时,我没有得到期望的结果。
当前不良行为:
-
当我点击文本字段时,我什至在开始输入之前都会立即看到所有建议的列表(超过26,000条)
-
当我开始输入内容时,建议列表不会调整(例如,如果我输入“ a”,则会显示建议的完整列表,并且列表不会过滤为仅显示以“ a”开头的建议
所需结果:
我的相关代码:
import 'package:Flutter/material.dart';
import 'package:Flutter_typeahead/Flutter_typeahead.dart';
import '../providers/analysis_route_provider.dart';
class AutoCompleteTextfieldTwo extends StatefulWidget {
@override
_AutoCompleteTextfieldTwoState createState() =>
_AutoCompleteTextfieldTwoState();
}
class _AutoCompleteTextfieldTwoState extends State<AutoCompleteTextfieldTwo> {
final TextEditingController _controller = TextEditingController();
@override
Widget build(BuildContext context) {
return TypeAheadField(
hideOnEmpty: true,textFieldConfiguration: TextFieldConfiguration(
style: TextStyle(
color: Colors.white,),autofocus: false,controller: this._controller,keyboardType: TextInputType.text,enabled: true,focusNode: FocusNode(),decoration: Inputdecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(20),borderSide: BorderSide(
width: 2,color: Colors.blue,hintText: 'Type in company name or ticker symbol',hintStyle: TextStyle(
color: Colors.grey,getImmediateSuggestions: true,hideOnError: true,suggestionsCallback: (pattern) async {
return await AnalysisRouteProvider.getCompaniesForTextfield2(pattern);
},itemBuilder: (context,itemData) {
return ListTile(
title: Text(itemData['name'].toString()),subtitle: Text(itemData['symbol'].toString()),);
},onSuggestionSelected: (suggestion) {
print('selected');
FocusNode().unfocus();
this._controller.text = suggestion['name'].toString();
_controller.clear();
},);
}
}
Http请求:
static Future getCompaniesForTextfield2(String query) async {
var url = *url with api key here*;
http.Response response = await http.get(url,headers: {
'Content-Type': 'application/json',});
var jsonData = json.decode(response.body);
return jsonData;
}
JSON代码段(从API实际返回的对象超过26,000个):
[ {
"symbol" : "SPY","name" : "SPDR S&P 500","price" : 326.7,"exchange" : "NYSE Arca"
},{
"symbol" : "CMCSA","name" : "Comcast Corp","price" : 41.98,"exchange" : "Nasdaq Global Select"
},{
"symbol" : "KMI","name" : "Kinder Morgan Inc","price" : 11.83,"exchange" : "New York Stock Exchange"
}]
我也确定这部分信息是相关的。当前,当我调试并点击typeahead文本字段时,我在调试控制台中得到以下信息:
W/IInputConnectionWrapper(13704): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper(13704): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(13704): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper(13704): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(13704): endBatchEdit on inactive InputConnection
解决方法
我认为您应该在getImadiateSugetions
上设置false
,以禁止在Tap上显示建议列表。
关于第二个问题,您没有得到建议,我认为问题出在json中,
您使用的是json.decode,它将对[]
中的所有json进行解码以列出列表,如果在{}
中的map中对其进行解码,那么我想您应该做的是:
suggestionsCallback: (pattern) async {
var list = await AnalysisRouteProvider.getCompaniesForTextfield2(pattern);
return list[0];
},
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