Question

我正在尝试运行React教程中提供的示例代码：

https://facebook.github.io/react/docs/tutorial.html

我已下载示例代码并将其放入我的MAMP安装的htdocs文件夹中。

我将“http://localhost:3000/public/”放入浏览器，标题“评论”和两个表单字段和一个帖子按钮出现，但没有评论。我假设json文件中的两个注释应该出现。

我的目录结构与git项目相同，主网页文件夹中包含php和json文件，公共文件夹中包含html，css和javascript文件。

example.js在第34行抛出此错误

找不到

/ api / comments error

我认为它可能与我本地计算机上的ajax调用有关但我已将示例上传到远程服务器并且我收到同样的错误。

jquery.min.js也在第4行抛出错误：

http://localhost:3000/api/comments?_=1456333607052 404（未找到）

但我假设它是因为example.js引起的上游错误

我错过了什么吗？

这是我的index.html

    <!DOCTYPE html>
    <html>
      <head>
        <meta charset="utf-8">
        <title>React Tutorial</title>
        <!-- Not present in the tutorial. Just for basic styling. -->
        <link rel="stylesheet" href="css/base.css" />
        <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.7/react-dom.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.6.15/browser.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/0.3.5/marked.min.js"></script>
      </head>
      <body>
        <div id="content"></div>
        <script type="text/babel" src="scripts/example.js"></script>
        <script type="text/babel">
          // To get started with this tutorial running your own code, simply remove
          // the script tag loading scripts/example.js and start writing code here.
        </script>
      </body>
    </html>

这是我的example.js

/**
 * This file provided by Facebook is for non-commercial testing and evaluation
 * purposes only. Facebook reserves all rights not expressly granted.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

var Comment = React.createClass({
  rawMarkup: function() {
    var rawMarkup = marked(this.props.children.toString(), {sanitize: true});
    return { __html: rawMarkup };
  },

  render: function() {
    return (
      <div className="comment">
        <h2 className="commentAuthor">
          {this.props.author}
        </h2>
        <span dangerouslySetInnerHTML={this.rawMarkup()} />
      </div>
    );
  }
});

var CommentBox = React.createClass({
  loadCommentsFromServer: function() {
    $.ajax({
      url: this.props.url,
      dataType: 'json',
      cache: false,
      success: function(data) {
        this.setState({data: data});
      }.bind(this),
      error: function(xhr, status, err) {
        console.error(this.props.url, status, err.toString());
      }.bind(this)
    });
  },
  handleCommentSubmit: function(comment) {
    var comments = this.state.data;
    // Optimistically set an id on the new comment. It will be replaced by an
    // id generated by the server. In a production application you would likely
    // not use Date.now() for this and would have a more robust system in place.
    comment.id = Date.now();
    var newComments = comments.concat([comment]);
    this.setState({data: newComments});
    $.ajax({
      url: this.props.url,
      dataType: 'json',
      type: 'POST',
      data: comment,
      success: function(data) {
        this.setState({data: data});
      }.bind(this),
      error: function(xhr, status, err) {
        this.setState({data: comments});
        console.error(this.props.url, status, err.toString());
      }.bind(this)
    });
  },
  getInitialState: function() {
    return {data: []};
  },
  componentDidMount: function() {
    this.loadCommentsFromServer();
    setInterval(this.loadCommentsFromServer, this.props.pollInterval);
  },
  render: function() {
    return (
      <div className="commentBox">
        <h1>Comments</h1>
        <CommentList data={this.state.data} />
        <CommentForm onCommentSubmit={this.handleCommentSubmit} />
      </div>
    );
  }
});

var CommentList = React.createClass({
  render: function() {
    var commentNodes = this.props.data.map(function(comment) {
      return (
        <Comment author={comment.author} key={comment.id}>
          {comment.text}
        </Comment>
      );
    });
    return (
      <div className="commentList">
        {commentNodes}
      </div>
    );
  }
});

var CommentForm = React.createClass({
  getInitialState: function() {
    return {author: '', text: ''};
  },
  handleAuthorChange: function(e) {
    this.setState({author: e.target.value});
  },
  handleTextChange: function(e) {
    this.setState({text: e.target.value});
  },
  handleSubmit: function(e) {
    e.preventDefault();
    var author = this.state.author.trim();
    var text = this.state.text.trim();
    if (!text || !author) {
      return;
    }
    this.props.onCommentSubmit({author: author, text: text});
    this.setState({author: '', text: ''});
  },
  render: function() {
    return (
      <form className="commentForm" onSubmit={this.handleSubmit}>
        <input
          type="text"
          placeholder="Your name"
          value={this.state.author}
          onChange={this.handleAuthorChange}
        />
        <input
          type="text"
          placeholder="Say something..."
          value={this.state.text}
          onChange={this.handleTextChange}
        />
        <input type="submit" value="Post" />
      </form>
    );
  }
});

ReactDOM.render(
  <CommentBox url="/api/comments" pollInterval={2000} />,
  document.getElementById('content')
);

Answer 1

提供的示例服务器（请参阅本教程的README.md）具有配置路由“/ api / comments”URL，您的独立服务器将不会配置该URL。将其添加到您的服务器，或者更简单，只使用其中一个示例服务器脚本。

Answer 2

您需要阅读教程代码所包含的README文件。您需要运行其服务器实现以提供/ api / comments端点。

在example.js中引发错误的反应教程示例：42

2 个答案: