[英]error in perform searching using cloud firestore in flutter
我在获取搜索结果时遇到问题。 我在Cloud firestore
有一些数据,我想对该数据执行搜索。 这是数据的屏幕截图,但是当我搜索时,我无法获取任何数据。
这是代码...
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:reminder/searchservice.dart';
class MySearchPage extends StatefulWidget {
@override
_MySearchPageState createState() => new _MySearchPageState();
}
class _MySearchPageState extends State<MySearchPage> {
var queryResultSet = [];
var tempSearchStore = [];
initiateSearch(value) {
if (value.length == 0) {
setState(() {
queryResultSet = [];
tempSearchStore = [];
});
}
var capitalizedValue =
value.substring(0, 1).toUpperCase() + value.substring(1);
if (queryResultSet.length == 0 && value.length == 1) {
SearchService().searchByName(value).then((QuerySnapshot docs) {
for (int i = 0; i < docs.documents.length; ++i) {
queryResultSet.add(docs.documents[i].data);
}
});
} else {
tempSearchStore = [];
queryResultSet.forEach((element) {
if (element['email'].startsWith(capitalizedValue)) {
setState(() {
tempSearchStore.add(element);
});
}
});
}
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: Text('Search Here'),
),
body: ListView(children: <Widget>[
Padding(
padding: const EdgeInsets.all(10.0),
child: TextField(
onChanged: (val) {
initiateSearch(val);
},
decoration: InputDecoration(
prefixIcon: IconButton(
color: Colors.black,
icon: Icon(Icons.arrow_back),
iconSize: 20.0,
onPressed: () {
Navigator.of(context).pop();
},
),
contentPadding: EdgeInsets.only(left: 25.0),
hintText: 'Search by Email',
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(4.0))),
),
),
SizedBox(height: 10.0),
GridView.count(
padding: EdgeInsets.only(left: 10.0, right: 10.0),
crossAxisCount: 2,
crossAxisSpacing: 4.0,
mainAxisSpacing: 4.0,
primary: false,
shrinkWrap: true,
children: tempSearchStore.map((element) {
return buildResultCard(element);
}).toList())
]));
}
}
Widget buildResultCard(data) {
return Card(
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
elevation: 2.0,
child: Container(
child: Center(
child: Text(data['email'],
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.black,
fontSize: 20.0,
),
)
)
)
);
}
这是服务代码...
import 'package:cloud_firestore/cloud_firestore.dart';
class SearchService {
searchByName(String searchField) {
return Firestore.instance
.collection('task')
.where('title',
isEqualTo: searchField.substring(0, 1).toUpperCase())
.getDocuments();
}
}
我猜你的错误是在.where
子句中。
这是一个非常有线的情况
.where('title', isEqualTo: searchField.substring(0, 1).toUpperCase())
并且仅当标题的首字母与您搜索的第一个字母相对应时,它才匹配。 所以我敢打赌,您的docs.documents.lenght
为0。
仔细阅读Cluod Firestore 查询部分。
.where('title', isGreaterThan: searchField)
for (int i = 0; i < docs.documents.length; ++i) { //TODO: do more sofisticated filtering here }
task field
并使用您自己预先构建的“搜索字符串”填充此值,并以基本Cloud Firestore查询应返回所需内容的方式进行填充。
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