Question

我正在尝试构建一个使用PHP生成的JSON的应用程序，然后使用JavaScript进行管理。

目前它没有按预期工作，我不确定原因。

代码片段：

$(document).ready(function(){

      var projects = <?= $json; ?>;
      $(window).bind('hashchange', function(){

         var potential = window.location.hash.substring(1);

         $.each(projects, function(i,project){

            if (project.permalink == potential)
            {
               alert(project.title);
               $('#title').text(project.title);
               $('#agency').text(project.agency);
            }
            else
            {
               alert('potential: ' + potential + '. project.permalink: ' + project.permalink);
            }
        });
      });
   });

因此，在更改URL的散列部分后，我会检查永久链接是否列在我拥有的JSON块中。（固定值）。警报说project.permalink未定义。

PHP变量$ json是使用PHP数组和json_encode（）函数创建的。

JSON在这里：

   var projects = [{"hand-made-cards":{"id":"3","title":"Hand Made Cards","type":"","description":"","website_url":"http:\/\/northumberlhand-made.co.uk","agency":"-","permalink":"hand-made-cards","position":"1","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:42:14","datetime_updated":"2012-06-03 17:44:37","datetime_deleted":"0000-00-00 00:00:00","rel_id":"13"}},{"olive-design":{"id":"2","title":"Olive Design","type":"","description":"Olive Design website description. What happened here?","website_url":"http:\/\/olive-design.co.uk","agency":"Gardiner Richardson","permalink":"olive-design","position":"2","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:41:31","datetime_updated":"2012-06-03 17:43:50","datetime_deleted":"0000-00-00 00:00:00","rel_id":"14"}},{"riba-microsite":{"id":"1","title":"RIBA Microsite","type":"","description":"Some info abou the RIBA MS.","website_url":"http:\/\/ram.grtest.com","agency":"Gardiner Richardson","permalink":"riba-microsite","position":"3","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:40:55","datetime_updated":"2012-06-03 17:43:29","datetime_deleted":"0000-00-00 00:00:00","rel_id":"15"}}];

更新的JSON在这里，建议我删除了包装每个对象的附加对象：

  var projects = [[{"id":"3","title":"Hand Made Cards","type":"","description":"","website_url":"http:\/\/northumberlhand-made.co.uk","agency":"-","permalink":"hand-made-cards","position":"1","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:42:14","datetime_updated":"2012-06-03 17:44:37","datetime_deleted":"0000-00-00 00:00:00","rel_id":"13"}],[{"id":"2","title":"Olive Design","type":"","description":"Olive Design website description. What happened here?","website_url":"http:\/\/olive-design.co.uk","agency":"Gardiner Richardson","permalink":"olive-design","position":"2","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:41:31","datetime_updated":"2012-06-03 17:43:50","datetime_deleted":"0000-00-00 00:00:00","rel_id":"14"}],[{"id":"1","title":"RIBA Microsite","type":"","description":"Some info abou the RIBA MS.","website_url":"http:\/\/ram.grtest.com","agency":"Gardiner Richardson","permalink":"riba-microsite","position":"3","added_by":"1","updated_by":"1","deleted_by":"0","published":"1","deleted":"0","datetime_added":"2012-06-03 16:40:55","datetime_updated":"2012-06-03 17:43:29","datetime_deleted":"0000-00-00 00:00:00","rel_id":"15"}]];

Answer 1

你的JSON实际上有一个额外的级别没有多大意义：每个项目都包含在一个额外的对象中（为了清楚起见，重新缩进JSON）：

[
    {
        "hand-made-cards": {
            "id":"3",
            "title":"Hand Made Cards",
            "type":"",
            "description":"",
            "website_url":"http:\/\/northumberlhand-made.co.uk",
            "agency":"-",
            "permalink":"hand-made-cards",
            "position":"1",
            "added_by":"1",
            "updated_by":"1",
            "deleted_by":"0",
            "published":"1",
            "deleted":"0",
            "datetime_added":"2012-06-03 16:42:14",
            "datetime_updated":"2012-06-03 17:44:37",
            "datetime_deleted":"0000-00-00 00:00:00",
            "rel_id":"13"
        }
    },

    {
        "olive-design": {
            "id":"2",
            "title":"Olive Design",
            "type":"",
            "description":"Olive Design website description. What happened here?",
            "website_url":"http:\/\/olive-design.co.uk",
            "agency":"Gardiner Richardson",
            "permalink":"olive-design",
            "position":"2",
            "added_by":"1",
            "updated_by":"1",
            "deleted_by":"0",
            "published":"1",
            "deleted":"0",
            "datetime_added":"2012-06-03 16:41:31",
            "datetime_updated":"2012-06-03 17:43:50",
            "datetime_deleted":"0000-00-00 00:00:00",
            "rel_id":"14"
        }
    },
    ... (snip) ...

我的猜测是你的PHP代码中生成的JSON不正确，需要更改它以在JSON数组的顶层生成每个项目，而不是包含在其他对象中。

Answer 2

查看您的JSON数据。你有一个对象列表......

[{"hand-made-cards":{key:val,...}}, 
 {"olive-design":{key:val,...}}];

您确实希望{key:val,...}成为列表projects的成员。目前，您有一个对象列表，其中每个对象都有一个键：值对。您可以通过执行project.hand-made-cards.permalink或project.olive-design.permalink来引用正确的值，但这可能不是您想要做的。

Answer 3

根据你的例子json：projects [0] [“hand-made-cars”]。定义了永久链接，但当你在项目中执行每个时，你就“循环”在数组上（其中有0）在我的例子中），你可能想要循环遍历项目[0]，或者似乎更好地修复json，并且不要在哈希中添加数组，所以它看起来像：

projects = {"hand-made-cars":{...}, "other-cars": {...}}

此外，如果你的$ json是json_encode的输出，那么看一下http://php.net/manual/en/function.json-encode.php，你就会看到第二个参数。您可能想要使用JSON_FORCE_OBJECT。

JSON参数获取

3 个答案: