flutter-web利用dart js 库发起http request

初学flutter,初学前端,尝试在dart中直接使用HttpClient时,直接报出Platform not supported,查资料发现他还不支持浏览器。 通过查阅资料发现可以借助axios 与 dart:js 之间的互相调用来实现。目前还不清楚有没有其它更好的方式。实例代码:

main.dart:

import 'package:flutter/material.dart';
import 'dart:js';

void callJS(){
  context['console'].callMethod('log', ['开始调用']);
  JsObject(context['getDartCall'], ['http://*****.com','{ID: 1234 , Name: "Hunter"}']);
}

void jsCallBack(resData){
  //结果回调
  print(resData);
}

void main() {
  //定义回调方法
  context['jsCallBack'] = jsCallBack;
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return new MaterialApp(
        home: new MyHomePage(),
      );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  

  @override
  Widget build(BuildContext context) {
    var spacer = new SizedBox(height: 32.0);

    return new Scaffold(
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new Text('Dart 与 JS 互相调用实例'),
            new Text('发起调用'),
            spacer,
            new RaisedButton(
              onPressed: (){
                callJS();
              },
              child: new Text('发起调用'),
            ),
          ],
        ),
      ),
    );
  }
}

 在web下的index.html里面需要引入对应的js

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="description" content="A new Flutter project.">

  <!-- iOS meta tags & icons -->
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="sharebook">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="shortcut icon" type="image/png" href="favicon.png"/>

  <title>sharebook</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>
  <!-- This script installs service_worker.js to provide PWA functionality to
       application. For more information, see:
       https://developers.google.com/web/fundamentals/primers/service-workers -->
  <script src="https://cdn.bootcss.com/axios/0.18.0/axios.min.js" type="application/javascript"></script>
  <script>
    if ('serviceWorker' in navigator) {
      window.addEventListener('load', function () {
        navigator.serviceWorker.register('flutter_service_worker.js');
      });
    }
    
    function getDartCall(reqUrl, arg){
        resResult = '';
        axios({
            method: 'get',
            url: reqUrl,
            params: arg
        })
        .then(function(response) {
            resResult = response.data;
            jsCallBack(resResult);
        }).catch(function(erroe){
          //请求失败回调
          jsCallBack(erroe);
        });
    }
  </script>
  <script src="main.dart.js" type="application/javascript"></script>
</body>
</html>

 

posted @ 2020-06-14 10:55  modentime  阅读(92)  评论(0编辑  收藏