将json文件从php连接到ReactJs

Question

请帮帮我。我有一个在php中生成的json文件。我需要通过ajax将文件传输到组件React js。但出了点问题。控制台在json中写入错误，但json是自动生成的。谢谢！

我的代码reactjs：

/*var data = [
{type: 1, tempFrom: "+5", tempTo: "+8"},
{type: 2, tempFrom: "+5", tempTo: "+8"},
{type: 3, tempFrom: "+5", tempTo: "+8"},
{type: 4, tempFrom: "+5", tempTo: "+8"}
];*/


var WeatherItem = React.createClass({
 render: function() {
  return (
   <div className="weatherItem">
    <h2 className="weatherCity">
     {this.props.city}
    </h2>
    {this.props.children}
  </div>
  );
 }
});

var WeatherBox = React.createClass({
 getInitialState: function() {
  return {data: []};
 },
componentDidMount: 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)
});
},
render: function() {
 return (
  <div className="wetherBox">
  <h1> Weather</h1>
  <WeatherForm />
  <WeatherList data={this.state.data} />
  </div>
  );
 }
 });

 var WeatherList = React.createClass({
  render: function() {
   var weatherNodes = this.props.data.map(function(weatherItem){
    return (
     <WeatherItem city = {weatherItem.city} key = {weatherItem.id}>
     {weatherItem.text}</WeatherItem>
    );
  });
  return (
   <div className="weatherList">
    {weatherNodes}
   </div>
  );
 }
});

var WeatherForm = React.createClass({
 render: function() {
  return (
  <div className="weatherForm">
   Hello, world! I am a WeatherForm.
  </div>
  );
}
});

ReactDOM.render(
<WeatherBox url="weather.php" />,
document.getElementById('content')
);

PHP：

<?php
$city = $_POST["city_id"];

$data_file = 'https://export.yandex.ru/bar/reginfo.xml?region='.$city.'.xml';   // загружаем файл прогноза погоды для выбранного города
$xml = simplexml_load_file($data_file); // загружаем xml файл через simple_xml

foreach($xml->weather->day as $day){

  foreach($day->day_part as $day_part):
   $img = strval($day_part->{'image-v2'});
   $tempFrom = strval($day_part->temperature_from);
  $tempTo = strval($day_part->temperature_to);

  $attrs = $day_part->attributes();
  $type= strval($attrs['type']);

  echo json_encode(array("type"=>$type, "src"=>$img, "tempFrom"=>$tempFrom, "tempTo"=>$tempTo));

  endforeach;
}

Answer 1

尝试在回复中添加标头以指示JSON内容，按数组回显结果将不是有效的JSON，以这种方式重构代码：

<?php

$city = $_POST["city_id"];

$data_file = 'https://export.yandex.ru/bar/reginfo.xml?region='.$city.'.xml';   // загружаем файл прогноза погоды для выбранного города
$xml = simplexml_load_file($data_file); // загружаем xml файл через simple_xml

$result = array();

foreach($xml->weather->day as $day){

  foreach($day->day_part as $day_part):
   $img = strval($day_part->{'image-v2'});
   $tempFrom = strval($day_part->temperature_from);
  $tempTo = strval($day_part->temperature_to);

  $attrs = $day_part->attributes();
  $type= strval($attrs['type']);
  $result[] = array("type"=>$type, "src"=>$img, "tempFrom"=>$tempFrom, "tempTo"=>$tempTo);

  endforeach;
}

header('Content-Type: application/json');
echo json_encode($result);