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【已解决】ReactJS中警告:Form submission canceled because the form is not connected

ReactJS crifan 602浏览 0评论

折腾:

【已解决】ReactJS中页面跳转后显示nginx 404 Not Found

期间,Chrome中出现警告:

Form submission canceled because the form is not connected :4000/xxx_web/main:1

然后页面没有发生导航

而与此对应的是:

Safari中,没有这个提示,然后页面就发生导航了,跳转新页面:

http://localhost:4000/xxx_web/main?

然后加载资源失败,所以404了。

Form submission canceled because the form is not connected

javascript – Getting Error “Form submission canceled because the form is not connected” – Stack Overflow

和Ajax不一样,Form表单的提交,会导致页面(移动)刷新

有人提到了:

event.preventDefault();

但是此处没用。我试过了。

javascript – How to fix the error “Form submission canceled because the form is not connected” in the latest browser versions (IE, Mozilla and Chrome) – Stack Overflow

Chrome报表单提交错误,Form submission canceled because the form is not connected

Form submission canceled because the form is not connected · Issue #2679 · erikras/redux-form

改为:type=‘button’

Form submission canceled because the form is not connected · Issue #4934 · vuejs/vue

此处去试试:

把<form>改为<div>

以及把其中的

<button type=“submit”

改为:

<button type=“button”onClick={this.submitLogin}

即:

          <div>
            <div className=”form-group has-feedback”>
              <input type=”text” className=”form-control” placeholder=”账号” />
              <span className=”glyphicon glyphicon-envelope form-control-feedback”></span>
            </div>
            <div className=”form-group has-feedback”>
              <input type=”password” className=”form-control” placeholder=”密码” />
              <span className=”glyphicon glyphicon-lock form-control-feedback”></span>
            </div>
            <div className=”row”>
              <div className=”col-xs-12″>
                <button type=’button’ onClick={this.submitLogin} className=”btn btn-primary btn-block btn-flat”>登录</button>
              </div>
            </div>
            <br />
            <a href=”https://shimo.im/doc/xxx” target=’_blank’>
              <p className=”xxx_help”>xxx帮助</p>
            </a>
          </div>

结果

就没了对应的警告了:

然后再去看看:

Safari中,页面会不会跳转

以及:

form的submit一定会导致页面跳转?

至少是Safari中,一定会导致页面跳转?

还真的是,解决了Chrome中的form的警告,Safari中页面就不会跳转了:

但此处对于Chrome中的警告提示有个细节没搞懂:

别人提到了是Chrome 56版本有这个问题,

但是我此处已经是:

Chrome 60版本的了,不应该还有这个警告提示啊?

去看别人提到的:

HTML Standard

Issue 2416033002: Fixed the behaviour of form submit to match the standard: no submit is taken place when the form is… – Code Review

-》

Issue 2416033002: Fixed the behaviour of form submit to match the standard: no submit is taken place when the form is… – Code Review

-》

third_party/WebKit/Source/core/html/HTMLFormElement.cpp – Issue 2416033002: Fixed the behaviour of form submit to match the standard: no submit is taken place when the form is… – Code Review

+  // https://html.spec.whatwg.org/multipage/forms.html#form-submission-algorithm
+  // 2. If form document is not connected, has no associated browsing context,
+  // or its active sandboxing flag set has its sandboxed forms browsing
+  // context flag set, then abort these steps without doing anything.
+  if (!isConnected()) {
+    document().addConsoleMessage(ConsoleMessage::create(
+        JSMessageSource, WarningMessageLevel,
+        “Form submission canceled because the form is not connected”));
+    return;
+  }

-》

基本明白了:

Chrome 56之前应该是没有这个提示的。

Chrome 56之后,修复了,符合了HTML的规范,对于没有connected的form,会增加对应的提示,就是此处的:

Form submission canceled because the form is not connected

-》所以此处的提示,是符合HTML规范的做法。

然后此处再去把代码改为:

还是用React的方式的form:<form onSubmit

然后在form的submilt中,加上e.preventDefault();

其中button的type是submit

结果也是可以:

消除form的警告

且可以正常跳转页面的:

Safari中也可以正常跳转页面和无警告:

再继续去研究form的submit导致Safari页面跳转的事情

HTML Standard

没有完全看懂,但是好像是:

会根据情况去触发get或post

-》从而就是导致页面刷新了。

-》也想起来了,之前form参数还是加上了:method=‘post’的设置的。

应该就是这个意思。

-》而之前的preventDefault的就是放置浏览器收到form的get或post请求的。

-》从而避免了页面刷新。

DOM Standard

<a>, <area>, <link>, and <form> behavior · Issue #2615 · whatwg/html

Form submission: Should check connected twice · Issue #2708 · whatwg/html

form表单提交

细说 Form (表单) – Fish Li – 博客园

“<form action=”Handler1.ashx” method=”post” >”

form表单提交的几种方法 – itmyhome的专栏 – CSDN博客

6种form表单提交方式-很全了_AnyReport

HTML <form> 标签

由form表单来说说前后台数据之间的交互

总之就是,点击type为submit后,就会出现调用接口

接口可以用form的action指定,类型可以为type的get或post

【总结】

所以,此处为了消除警告,且可以正常跳转页面的话,至少有2类写法:

1.把form换成div,且记得把form中的button的type(不要设置为submit了,而是)改为其他的,比如”button”,然后给button加上onClick事件,实现表单的提交

-》这样的好处是不用担心form的警告和影响了,但是破坏了表单的原意,和后序可能的方便的表单验证。

相关代码:

  submitLogin(e){
    //TODO: call API to login
    console.log(‘Login submitLogin’);
    // e.preventDefault();
    stopEventPropgation(e);
    console.log(e);
    let jumpToPath = ‘/xxx_web/main’;
    this.props.history.push(jumpToPath);
  }
  render() {
    console.log(`Login render`);
    let loginBodyClass = ‘hold-transition login-page’;
    // <form onSubmit={this.submitLogin}>
    // <div onClick={this.submitLogin}>
    
    // <a className=”xxx_help” href=”https://shimo.im/doc/xxx”>xxx帮助</a>
    // <button type=”submit” className=”btn btn-primary btn-block btn-flat”>登录</button>
    
    return (
 …
        <div className=”login-box-body”>
          <p className=”login-box-msg”>请登录</p>
          <div>
            …
            <div className=”row”>
              <div className=”col-xs-12″>
                <button type=’button’ onClick={this.submitLogin} className=”btn btn-primary btn-block btn-flat”>登录</button>
              </div>
            </div>
          </div>
        </div>
    );
  }

2.保留form,且用<form onSubmit={xxx}>,内部的button的type是submit,但是要在form的submit函数中,加上:e.preventDefault(),用于阻止事件继续传递(给浏览器),则Chrome就不会报警告了,Safari也不会跳转页面了。

-》保留了form,是比较符合标准的做法。

相关代码:

  submitLogin(e){
    //TODO: call API to login
    console.log(‘Login submitLogin’);
    e.preventDefault();
    stopEventPropgation(e);
    console.log(e);
    let jumpToPath = ‘/xxx_web/main’;
    this.props.history.push(jumpToPath);
  }
  render() {
    console.log(`Login render`);
    let loginBodyClass = ‘hold-transition login-page’;
    // <form onSubmit={this.submitLogin}>
    // <div onClick={this.submitLogin}>
    
    // <a className=”xxx_help” href=”https://shimo.im/doc/xxx”>xxx帮助</a>
    // <button type=’button’ onClick={this.submitLogin} className=”btn btn-primary btn-block btn-flat”>登录</button>
    
    return (
        <div className=”login-box-body”>
          <p className=”login-box-msg”>请登录</p>
          <form onSubmit={this.submitLogin}>
            …
            <div className=”row”>
              <div className=”col-xs-12″>
                <button type=”submit” className=”btn btn-primary btn-block btn-flat”>登录</button>
              </div>
            </div>
          </form>
        </div>
      </div>
    );
  }

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