我该如何迭代JSON阵列

Question

我正在从URL加载以下JSON文件：

{
    "Airports": [
      {
        "listing": "East 34th Street Heliport",
        "iata": "TSS",
        "type": "heliport",
        "size": "tiny"
      },
      {
        "listing": "Blaine Municipal Airport",
        "iata": "BWS",
        "type": "closed",
        "size": "small"
      },
      {
        "listing": "Toronto City Airport",
        "iata": "YTZ",
        "type": "airport",
        "size": "medium"      
      },
      {
        "listing": "Amsterdam Airport Schiphol",
    "iata": "AMS",
        "type": "airport",
        "size": "large"      
       },
      {
        "listing": "Detroit County Airport",
        "iata": "DTW",
        "type": "airport",
        "size": "large"
      }
    ]
}

我想通过机场数组，并在DOM上显示所有关键名称和值。我使用jQuery Mobile在.each((循环中这样做：

    if(pageID == "page1"){
        var pageTitle="Error";
        //temp var to hold collapsible HTML 
        var colItem="";
        $.ajax({
        url:"some_url",
        method:"GET",
        cache:false,
        dataType:"json",
        success:function(data){
            pageTitle = (Object.keys(data)[0]).toUpperCase();

            $(data.Airports).each(function(index,value){                   
                //build all the needed collapsibles
                colItem += 
                        "<div data-role='collapsible'><h2>" 
                        + value.listing + 
                        "</h2> <p>" 
                        + + 
                        "</p> <p>" 
                        + + 
                        "</p> <p>" 
                        + + 
                        "</p></div>";
            });
        }            
    });

是否可以在不引用诸如我使用value的工作之类的关键值的情况下进行此操作。清单，而是像数组一样迭代它，以这种方式获取所有值。

我正在寻找与此类似的最终结果：

 East 34th Street Heliport
iata       TSS
type       heliport
size       tiny

Answer 1

您可以这样做。动态创建HTML字符串，然后将其添加到主HTML页面：

var jsonData = {
    "Airports": [
      {
        "listing": "East 34th Street Heliport",
        "iata": "TSS",
        "type": "heliport",
        "size": "tiny"
      },
      {
        "listing": "Blaine Municipal Airport",
        "iata": "BWS",
        "type": "closed",
        "size": "small"
      },
      {
        "listing": "Toronto City Airport",
        "iata": "YTZ",
        "type": "airport",
        "size": "medium"      
      },
      {
        "listing": "Amsterdam Airport Schiphol",
    "iata": "AMS",
        "type": "airport",
        "size": "large"      
       },
      {
        "listing": "Detroit County Airport",
        "iata": "DTW",
        "type": "airport",
        "size": "large"
      }
    ]
};
var nHTML = '';
jsonData.Airports.forEach(function(airport){
  var paragraph = '';
  paragraph+='<p>iata:   '+airport.iata+'</p>' + 
             '<p>type:   '+airport.type+'</p>' +
             '<p>size:   '+airport.size+'</p>';
  var colItem = '<div data-role="collapsible">' +airport.listing+ '<h2></h2>'+paragraph+'</div>';
  nHTML+=colItem;
});
$('#container').html(nHTML);

#container div{
  margin: 7px;
  background: grey;
  padding: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id='container'></div>

Answer 2

这是您如何做的非常简单的JSfiddle：

https://jsfiddle.net/8euuoccf/

var jsonData = {
  "Airports": [{
      "listing": "East 34th Street Heliport",
      "iata": "TSS",
      "type": "heliport",
      "size": "tiny"
    },
    {
      "listing": "Blaine Municipal Airport",
      "iata": "BWS",
      "type": "closed",
      "size": "small"
    },
    {
      "listing": "Toronto City Airport",
      "iata": "YTZ",
      "type": "airport",
      "size": "medium"
    },
    {
      "listing": "Amsterdam Airport Schiphol",
      "iata": "AMS",
      "type": "airport",
      "size": "large"
    },
    {
      "listing": "Detroit County Airport",
      "iata": "DTW",
      "type": "airport",
      "size": "large"
    }
  ]
};
$(document).ready(function() {
    // Iterate over each airport
    jsonData.Airports.forEach(airport => {
      colItem = `<div data-role='collapsible'><h2>${airport.listing}</h2>`;
      // Iterate over each airport key
      Object.keys(airport).forEach(key => {
        colItem += `<p>${key}: ${airport[key]}</p>`;
      });
      colItem += '</div>';
      // Finally, append it to body
      var html = $.parseHTML(colItem);
      $('body').append(colItem);
    });
});

有几种迭代对象键/值的方法。Object.entries()是另一种选择，但请记住，IE不支持它。在此示例中，我使用了Object.keys()，然后访问相应的值。如果您想要DOM中的另一种格式(例如表(，请使用key和airport[key]，并将其附加并添加。