Folder Name Updated

CRUD_TASK/create_data.dart

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+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:flutter/material.dart';
+
+class CreateData extends StatefulWidget {
+  const CreateData({ Key? key }) : super(key: key);
+
+  @override
+  _CreateDataState createState() => _CreateDataState();
+}
+
+class _CreateDataState extends State<CreateData> {
+
+  TextEditingController nameController = TextEditingController();
+  TextEditingController emailController = TextEditingController();
+  TextEditingController grController = TextEditingController();
+
+  createData(){     
+    DocumentReference documentReference = FirebaseFirestore.instance.collection('data').doc(grController.text);
+    Map<String, String> fields = {
+      "GR": grController.text,
+      "NAME": nameController.text,
+      "EMAIL": emailController.text
+    };
+    documentReference.set(fields);    
+  }
+
+  String error = "";
+  Future<bool> checkDoc() async {
+    var collectionRef = FirebaseFirestore.instance.collection('data');
+    var doc = await collectionRef.doc(grController.text).get();
+    if(doc.exists)
+    {
+      setState(() {
+        error = "GR Already Exist";
+      });
+    }
+    else{
+      setState(() {
+        error = "";
+      });
+    }
+    return doc.exists;    
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text("CREATE DATA"),
+      ),
+      body: Container(
+        margin: const EdgeInsets.all(30),
+        child: Column(
+          children: [
+            TextFormField(
+              controller: grController,
+              onEditingComplete: checkDoc,
+              decoration:  InputDecoration(
+                errorText: error,
+                hintText: "GR",
+                border: const OutlineInputBorder(),            
+              ),
+              style: const TextStyle(fontSize: 20),
+            ),
+            const SizedBox(height: 30),
+              TextFormField(
+              controller: nameController,
+              decoration: const InputDecoration(
+                hintText: "Name",
+                border: OutlineInputBorder(),            
+              ),
+              style: const TextStyle(fontSize: 20),
+            ),
+            const SizedBox(height: 30),
+             TextFormField(
+              controller: emailController,
+              decoration: const InputDecoration(
+                hintText: "Email",
+                border: OutlineInputBorder(),            
+              ),
+              style: const TextStyle(fontSize: 20),
+            ),
+            const SizedBox(height: 20),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                error.isEmpty ? MaterialButton(
+                child: const Text("CREATE", style: TextStyle(fontSize: 15)),                
+                onPressed: ()=>{
+                  createData()
+                },
+                color: Colors.blue,
+                ) : const Text(" "),               
+                const SizedBox(width: 50,),
+                MaterialButton(
+                child: const Text("CLEAR", style: TextStyle(fontSize: 15,)),                
+                onPressed: ()=>{
+                  nameController.clear(),
+                  emailController.clear(),
+                  grController.clear()
+                },
+                color: Colors.red,
+                ),
+              ],
+            )
+          ],
+        )
+      ),
+    );
+  }
+}

CRUD_TASK/delete_date.dart

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+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:flutter/material.dart';
+
+class DeleteData extends StatefulWidget {
+  const DeleteData({ Key? key }) : super(key: key);
+
+  @override
+  _DeleteDataState createState() => _DeleteDataState();
+}
+
+class _DeleteDataState extends State<DeleteData> {
+
+  TextEditingController grController = TextEditingController();
+
+  deleteData(){
+    DocumentReference documentReference = FirebaseFirestore.instance.collection('data').doc(grController.text);
+    documentReference.delete();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text("DELTE DATA"),
+      ),
+      body: Container(
+        margin: const EdgeInsets.all(30),
+        child: Column(
+          children: [
+            TextFormField(
+              controller: grController,
+              decoration: const InputDecoration(
+                hintText: "GR",
+                border: OutlineInputBorder(),            
+              ),
+              style: const TextStyle(fontSize: 20),
+            ),
+            MaterialButton(
+                child: const Text("DELETE", style: TextStyle(fontSize: 15,)),                
+                onPressed: ()=>{
+                  deleteData()                             
+                },
+                color: Colors.red,
+                ),
+          ]
+
+          )
+            )      
+    );
+  }
+}

CRUD_TASK/generated_plugin_registrant.dart

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+//
+// Generated file. Do not edit.
+//
+
+// ignore_for_file: directives_ordering
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:cloud_firestore_web/cloud_firestore_web.dart';
+import 'package:firebase_core_web/firebase_core_web.dart';
+
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+
+// ignore: public_member_api_docs
+void registerPlugins(Registrar registrar) {
+  FirebaseFirestoreWeb.registerWith(registrar);
+  FirebaseCoreWeb.registerWith(registrar);
+  registrar.registerMessageHandler();
+}

CRUD_TASK/main.dart

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+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:crud_task/delete_date.dart';
+import 'package:crud_task/read_data.dart';
+import 'package:crud_task/update_data.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'package:flutter/material.dart';
+import 'create_data.dart';
+
+
+void main() {
+  runApp(const MyApp());
+  Firebase.initializeApp();
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      theme: ThemeData(  
+        primarySwatch: Colors.blue,
+      ),
+      home: const MyHomePage(),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({Key? key}) : super(key: key);
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  static const title = "CRUD";
+
+  deleteData() async {
+     CollectionReference collectionReference = FirebaseFirestore.instance.collection('data');
+     QuerySnapshot querySnapshot = await collectionReference.get();
+     querySnapshot.docs[1].reference.delete();
+  }
+
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+        home: Scaffold(
+          appBar: AppBar(
+            title: const Text(title),
+          ),          
+          body: Column(
+            children:  [
+              Center(
+                child: Container(
+                  margin: const EdgeInsets.all(20.0),
+                  child: const Text("FIRESTORE CRUD OPS", style: TextStyle(fontSize: 30.0),
+                )),                  
+              ),
+              MaterialButton(
+                child: const Text("CREATE DATA", style: TextStyle(fontSize: 15)),
+                height: 50,
+                minWidth: 200,
+                color: Colors.grey,
+                onPressed: () => {
+                  Navigator.push(context, MaterialPageRoute(builder: (context)=>const CreateData()))              
+                }
+                ),
+                const SizedBox(height: 30,),
+                MaterialButton(
+                child: const Text("READ DATA", style: TextStyle(fontSize: 15)),
+                height: 50,
+                minWidth: 200,
+                color: Colors.grey,
+                onPressed: ()=>{
+                  Navigator.push(context, MaterialPageRoute(builder: (context)=>const ReadData()))                              
+                }
+                ),
+                const SizedBox(height: 30,),
+                MaterialButton(
+                child: const Text("UPDATE DATA", style: TextStyle(fontSize: 15)),
+                height: 50,
+                minWidth: 200,
+                color: Colors.grey,
+                onPressed: ()=>{
+                  Navigator.push(context, MaterialPageRoute(builder: (context)=>const UpdateData()))
+                }
+                ),
+                const SizedBox(height: 30,),
+                MaterialButton(
+                child: const Text("DELETE DATA", style: TextStyle(fontSize: 15)),
+                height: 50,
+                minWidth: 200,
+                color: Colors.grey,
+                onPressed: ()=>{
+                  Navigator.push(context, MaterialPageRoute(builder: (context)=>const DeleteData()))
+                }
+                ),
+            ],            
+          ),
+        ),      
+    );
+  }
+}

CRUD_TASK/read_data.dart

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+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:flutter/material.dart';
+
+
+class ReadData extends StatefulWidget {
+  const ReadData({ Key? key }) : super(key: key);
+
+  @override
+  _ReadDataState createState() => _ReadDataState();
+}
+
+class Data{
+  @required late String name;
+  @required late String email;
+}
+
+class _ReadDataState extends State<ReadData> {
+
+  var mylist = [];
+  final Stream<QuerySnapshot> data = FirebaseFirestore.instance.collection('data').snapshots();
+
+  @override
+  Widget build(BuildContext context) {          
+    return Scaffold(
+
+      appBar: AppBar(
+        title: const Text("READ DATA"),
+      ),
+      body: StreamBuilder<QuerySnapshot>(
+        stream: data,
+        builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
+          if(snapshot.connectionState==ConnectionState.waiting)
+          {
+            return const Text("Loading");
+          }
+          final info = snapshot.requireData;
+          return ListView.builder(
+            itemCount: info.size,
+            itemBuilder: (context, index) {
+              return Card(
+                child: Padding(
+                  padding: const EdgeInsets.all(15),
+                  child: Column(                    
+                    children: [
+                      Text(info.docs[index]['GR']),
+                      Text(info.docs[index]['NAME']),
+                      Text(info.docs[index]['EMAIL'])
+                    ],
+                  ),
+                   ),
+              );
+          });
+        }
+        )
+    );
+  }
+}