我觉得这是非常基本的东西，听起来应该是这样。但我无法在网上找到这个。设置很简单：
我有一个变量foo = 1，现在我想做的就是将其发送到我的app.py。我知道我需要AJAX，所以我也在那里。我认为我需要做的事情是这样的：
js ：
$(function() {
$('#btn').click(function() {
var answer = 1
$.ajax({
url: '/checkAnswer',
data: answer,
type: 'GET',
success: function(data) {
console.log(data);
},
error: function(error) {
console.log(error);
}
});
});
});
py ：
@app.route('/checkAnswer', methods=['GET', 'POST'])
def checkAnswer():
try:
answer = request.data
if answer == 1:
return 'ham'
else:
return answer
except Exception as e:
return 'foo bar'
答案 0 :(得分：1)
最好在您传输数据时使用import 'package:flutter/material.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
home: new ExampleWidget(),
);
}
}
/// Opens an [AlertDialog] showing what the user typed.
class ExampleWidget extends StatefulWidget {
ExampleWidget({Key key}) : super(key: key);
@override
_ExampleWidgetState createState() => new _ExampleWidgetState();
}
/// State for [ExampleWidget] widgets.
class _ExampleWidgetState extends State<ExampleWidget> {
final TextEditingController _controller = new TextEditingController();
@override
Widget build(BuildContext context) {
return new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new TextField(
controller: _controller,
decoration: new InputDecoration(
hintText: 'Type something',
),
),
new RaisedButton(
onPressed: () {
showDialog(
context: context,
child: new AlertDialog(
title: new Text('What you typed'),
content: new Text(_controller.text),
),
);
},
child: new Text('DONE'),
),
],
);
}
}
代替Launching lib/main.dart on Android SDK built for x86 in debug mode...
Built build/app/outputs/apk/app-debug.apk (21.5MB).
I/flutter ( 5187): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 5187): The following assertion was thrown building InputDecorator(decoration: InputDecoration(hintText:
I/flutter ( 5187): "Type something"); baseStyle: null; isFocused: false; isEmpty: true; dirty):
I/flutter ( 5187): No Material widget found.
I/flutter ( 5187): InputDecorator widgets require a Material widget ancestor.
I/flutter ( 5187): In material design, most widgets are conceptually "printed" on a sheet of material. In Flutter's
I/flutter ( 5187): material library, that material is represented by the Material widget. It is the Material widget
I/flutter ( 5187): that renders ink splashes, for instance. Because of this, many material library widgets require that
I/flutter ( 5187): there be a Material widget in the tree above them.
I/flutter ( 5187): To introduce a Material widget, you can either directly include one, or use a widget that contains
I/flutter ( 5187): Material itself, such as a Card, Dialog, Drawer, or Scaffold.
I/flutter ( 5187): The specific widget that could not find a Material ancestor was:
I/flutter ( 5187): InputDecorator(decoration: InputDecoration(hintText: "Type something"); baseStyle: null;
I/flutter ( 5187): isFocused: false; isEmpty: true)
I/flutter ( 5187): The ownership chain for the affected widget is:
I/flutter ( 5187): InputDecorator ← AnimatedBuilder ← Listener ← _GestureSemantics ← RawGestureDetector ←
I/flutter ( 5187): GestureDetector ← TextField ← Column ← ExampleWidget ← _ModalScopeStatus ← ⋯
I/flutter ( 5187):
I/flutter ( 5187): When the exception was thrown, this was the stack:
I/flutter ( 5187): #0 debugCheckHasMaterial.<anonymous closure> (package:flutter/src/material/debug.dart:26)
I/flutter ( 5187): #2 debugCheckHasMaterial (package:flutter/src/material/debug.dart:23)
I/flutter ( 5187): #3 InputDecorator.build (package:flutter/src/material/input_decorator.dart:334)
... <output omitted>
I/flutter ( 5187): (elided one frame from class _AssertionError)
I/flutter ( 5187): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter ( 5187): Another exception was thrown: No Material widget found.
。此外，POST和GET promises通常更清晰，更有用的回调。
js：
donepy：
fail行$(function() {
$('#btn').click(function() {
var answer = 1
$.ajax({
url: '/checkAnswer',
data: {
answer: answer
},
type: 'POST'
}).done(function(data) {
console.log(data);
}).fail(function(error) {
console.log(error);
});
});
是最好的情况。但是，在过去使用@app.route('/checkAnswer', methods=['POST'])
def checkAnswer():
try:
answer = request.form['answer'] if 'answer' in request.form else None
if answer == 1:
return 'ham'
else:
return answer
except Exception as e:
return 'foo bar'
发布数据时，我必须这样做以获取数据：
request.form['answer']因此，我建议发送JSON：
JS：
ajax吡啶：
answer = request.form.getlist('answer')[0]
注意：在ajax请求中设置内容类型很重要，好像没有设置$(function() {
$('#btn').click(function() {
var answer = 1
$.ajax({
url: '/checkAnswer',
data: JSON.stringify({'answer': answer}),
type: 'POST',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
}).done(function(data) {
console.log(data);
}).fail(function(error) {
console.log(error);
});
});
returns None。