javascript - 排序时保留JSON数组

我有两个来自外部网站的JSON数组。我对两个数组进行排序和合并，对其进行解码，然后按ID从高到低对它们进行排序。

当前，当单击选项“字母”时，将?sort=alphabetical添加到URL的末尾，并且当页面完成重新加载后，JSON数组将再次被解码和合并。

这不是我想要的结果:我不希望单击该选项时再次解码和合并JSON数组-我只是希望将已解码和合并的JSON数组按字母顺序排序。

数组:

$homepage = array();

$homepage[]= '{
   "info":{
      "collection":[
         {
            "Name":"Charlie",
            "ID":"7"
         },
         {
            "Name":"Emma",
            "ID":"9"
         }
      ]
   }
}';

$homepage[] = '{
   "info":{
      "collection":[
         {
            "Name":"Bob",
            "ID":"5"
         }
      ]
   }
}';

排序:

$data = array();
foreach ($homepage as $homepage2) {
    $tmp=json_decode($homepage2, false);
    $data = array_merge($data,$tmp->info->collection);
}

if(!empty($_GET['sort']) && $_GET['sort'] == 'alphabetical') {
    usort($data, function ($a, $b) {
        return strcmp($a->Name, $b->Name);
    });
}else{
    usort($data, function ($a, $b) {
        return $b->ID - $a->ID;
    });
}

echo'
<select onchange="location.href = this.value;">
    <option value="example.php?sort=alphabetical">Alphabetical</option>
</select>
';

foreach($data as $key) {
    echo'
    <a href="test.com">
    <p>'.$key->ID.'</p>
    <p>'.$key->Name.'</p>
    </a>
    ';
}

最佳答案

您可以使用JavaScript进行点击排序，而仅使用PHP将JSON传递给它。

提供了要显示列表的HTML结构后，我更新了此答案，将div元素用于记录，将p元素用于字段。

我们可以用两个按钮替换select列表，以选择排序顺序。

这是PHP代码:

<?php

$homepage = array();

$homepage[]= '{
   "info":{
      "collection":[
         {
            "Name":"Charlie",
            "ID":"13"
         },
         {
            "Name":"Emma",
            "ID":"9"
         }
      ]
   }
}';

$homepage[] = '{
   "info":{
      "collection":[
         {
            "Name":"Bob",
            "ID":"10"
         }
      ]
   }
}';

$data = array();
foreach ($homepage as $homepage2) {
    $tmp=json_decode($homepage2, false);
    $data = array_merge($data,$tmp->info->collection);
}

?>

<div id="container"></div>

<button id="sort1">Alphabetical</button>
<button id="sort2">High to Low</button>

<script>
    var collection = <?=json_encode($data)?>;

    function populate(compareFunc) {
        collection.sort(compareFunc);
        var container = document.getElementById('container');
        container.innerHTML = '';
        collection.forEach(function (key) {
            var div = document.createElement("div");
            div.className = "inventory";
            var span = document.createElement("span");
            span.textContent = key.ID;
            div.appendChild(span);
            span = document.createElement("span");
            span.textContent = key.Name;
            div.appendChild(span);
            container.appendChild(div);
        });
    }

    var populateById = populate.bind(null, function (a, b) {
        return a.ID - b.ID;
    });

    var populateByName = populate.bind(null, function (a, b) {
        return a.Name.localeCompare(b.Name);
    });

    document.getElementById("sort1").addEventListener('click', populateByName);
    document.getElementById("sort2").addEventListener('click', populateById);
    document.addEventListener('DOMContentLoaded', populateById);

</script>

对于示例数据，这将产生以下JavaScript/HTML，您可以在此处进行测试:

var collection = [{"Name":"Charlie","ID":"13"},{"Name":"Emma","ID":"9"},{"Name":"Bob","ID":"10"}];

function populate(compareFunc) {
    collection.sort(compareFunc);
    var container = document.getElementById('container');
    container.innerHTML = '';
    collection.forEach(function (key) {
        var div = document.createElement("div");
        div.className = "inventory";
        var span = document.createElement("span");
        span.textContent = key.ID;
        div.appendChild(span);
        span = document.createElement("span");
        span.textContent = key.Name;
        div.appendChild(span);
        container.appendChild(div);
    });
}

var populateById = populate.bind(null, function (a, b) {
    return a.ID - b.ID;
});

var populateByName = populate.bind(null, function (a, b) {
    return a.Name.localeCompare(b.Name);
});

document.getElementById("sort1").addEventListener('click', populateByName);
document.getElementById("sort2").addEventListener('click', populateById);
document.addEventListener('DOMContentLoaded', populateById);

span { margin-left: 5px }
div.inventory { border-bottom: 1px solid gray }

<div id="container"></div>

<button id="sort1">Alphabetical</button>
<button id="sort2">High to Low</button>

请注意，我给这三个项目提供的ID值与您的问题中的ID值不同，因为否则ID和Name的排序顺序将相同。

使用表格:替代

有很多不错的JavaScript库，它们提供了更多的功能来表示数据集。这是将jQuery与DataTables结合使用的示例:

var collection = [{"Name":"Charlie","ID":"13"},{"Name":"Emma","ID":"9"},{"Name":"Bob","ID":"5"}];

function populate() {
  var tbody = $('#collection>tbody');
  collection.forEach(function (key) {
    var row = $('<tr>');
    row.append($('<td>').text(key.ID));
    row.append($('<td>').text(key.Name));
    tbody.append(row);
  });
}

$(document).ready(function(){
  populate();
  $('#collection').DataTable();
});

<script src="http://code.jquery.com/jquery-1.12.3.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.12/css/jquery.dataTables.min.css">
<script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>

<table id="collection">
    <thead>
        <tr><th>ID</th><th>Name</th></tr>
    </thead>
    <tbody/>
</table>

实际代码甚至比不带基本表的纯JavaScript解决方案小(不包括所包含的库)。但这有上下排序，过滤，分页，漂亮的样式...