如何在 Flutter WebView 中将数据发布到 URL

Question

我想将一些数据发布到 Flutter WebView 中的 URL 主体。那么，我该怎么做呢？

Answer 1

webview_flutter目前没有发送 post 请求的方法。\n但是，您可以尝试我的flutter_inappwebview插件。它支持POST请求！

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使用当前最新版本5.0.5+3的flutter_inappwebview插件的一个简单示例是：

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var postData = Uint8List.fromList(utf8.encode("firstname=Foo&lastname=Bar"));\ncontroller.postUrl(url: Uri.parse("https://example.com/my-post-endpoint"), postData: postData);\n

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其中postData是格式中请求的正文x-www-form-urlencoded。

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例如，如果您有 PHP 服务器，则可以像平常一样访问firstname\xc2\xa0and值，即和。lastname$_POST[\'firstname\']$_POST[\'lastname\']

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您还可以使用初始 POST 请求来初始化InAppWebView\xc2\xa0widget，如下所示：

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child: InAppWebView(\n  initialUrlRequest: URLRequest(\n    url: Uri.parse("https://example.com/my-post-endpoint"),\n    method: \'POST\',\n    body: Uint8List.fromList(utf8.encode("firstname=Foo&lastname=Bar")),\n    headers: {\n      \'Content-Type\': \'application/x-www-form-urlencoded\'\n    }\n  ),\n  onWebViewCreated: (controller) {\n    \n  },\n),\n

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Answer 2

您可以在Flutter官方WebView上运行JS功能::

1-JS POST请求示例

**
 * sends a request to the specified url from a form. this will change the window location.
 * @param {string} path the path to send the post request to
 * @param {object} params the parameters to add to the url
 * @param {string} [method=post] the method to use on the form
 */

function post(path, params, method='post') {

  // The rest of this code assumes you are not using a library.
  // It can be made less verbose if you use one.
  const form = document.createElement('form');
  form.method = method;
  form.action = path;

  for (const key in params) {
    if (params.hasOwnProperty(key)) {
      const hiddenField = document.createElement('input');
      hiddenField.type = 'hidden';
      hiddenField.name = key;
      hiddenField.value = params[key];

      form.appendChild(hiddenField);
    }
  }

  document.body.appendChild(form);
  form.submit();
}

2-在 Flutter 中将 JS 函数转换为字符串并调用

final String postUrl="'https://jsonplaceholder.typicode.com/posts'";
final String postParam= "{name: 'Johnny Bravo'}";
final String requestMethod= "'post'";

final  String jsFunc="function post(path, params, method='post') {"+
    "const form = document.createElement('form');"+
    "form.method = method;"+
    "form.action = path;"+
    "for (const key in params) {"+
    "if (params.hasOwnProperty(key)) {"+
    "const hiddenField = document.createElement('input');"+
    "hiddenField.type = 'hidden';"+
    "hiddenField.name = key;"+
    "hiddenField.value = params[key];"+
    "form.appendChild(hiddenField);}}document.body.appendChild(form);form.submit();}"+
    "post($postUrl, $postParam, method=$requestMethod)";

3-在WebView中运行JS代码

return FutureBuilder<WebViewController>(
    future: _controller.future,
    builder: (BuildContext context,
        AsyncSnapshot<WebViewController> controller) {
      if (controller.hasData) {
        return FloatingActionButton(
          onPressed: () async {
            controller.data!.evaluateJavascript(jsFunc);
          },
          child: const Icon(Icons.call_received),
        );
      }
      return Container();
    });