如何显示从 Ajax 请求发回的数组。使用 Yii2

Question

我已经发送了一个 ajax 请求，然后它会查询数据库并发回我想要的。但是，当它返回到我的页面时，我仍然坚持实际显示它。

$.ajax({
    url: '<?php echo \Yii::$app->getUrlManager()->createUrl('cases/ajax') ?>',
    type: 'POST',
    data: { firstcategory: firstcategory },
    success: function(data) {
        for (var key in data) {
            var value = data[key];
            alert(value);
            document.write(value);
        }   
    }
});

如您所见，我正在尝试显示该值，但它返回的是一个数组。

这是从 ajax 请求发回的内容：

Array
(
[0] => app\models\Subcategory Object
    (
        [_attributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 1
                [name] => ADJUDICATION ON BEHALF OF OR AGAINST AN INSOLVENT PARTY
                [parent_id] => 2
            )

        [_oldAttributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 1
                [name] => ADJUDICATION ON BEHALF OF OR AGAINST AN INSOLVENT PARTY
                [parent_id] => 2
            )

        [_related:yii\db\BaseActiveRecord:private] => Array
            (
            )

        [_errors:yii\base\Model:private] => 
        [_validators:yii\base\Model:private] => 
        [_scenario:yii\base\Model:private] => default
        [_events:yii\base\Component:private] => Array
            (
            )

        [_behaviors:yii\base\Component:private] => Array
            (
            )

    )

[1] => app\models\Subcategory Object
    (
        [_attributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 2
                [name] => THE EXISTENCE OF A CONTRACT
                [parent_id] => 3
            )

        [_oldAttributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 2
                [name] => THE EXISTENCE OF A CONTRACT
                [parent_id] => 3
            )

        [_related:yii\db\BaseActiveRecord:private] => Array
            (
            )

        [_errors:yii\base\Model:private] => 
        [_validators:yii\base\Model:private] => 
        [_scenario:yii\base\Model:private] => default
        [_events:yii\base\Component:private] => Array
            (
            )

        [_behaviors:yii\base\Component:private] => Array
            (
            )

    )

[2] => app\models\Subcategory Object
    (
        [_attributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 3
                [name] => THE MEANING OF CONSTRUCTION CONTRACT
                [parent_id] => 3
            )

        [_oldAttributes:yii\db\BaseActiveRecord:private] => Array
            (
                [subcategory_id] => 3
                [name] => THE MEANING OF CONSTRUCTION CONTRACT
                [parent_id] => 3
            )

        [_related:yii\db\BaseActiveRecord:private] => Array
            (
            )

        [_errors:yii\base\Model:private] => 
        [_validators:yii\base\Model:private] => 
        [_scenario:yii\base\Model:private] => default
        [_events:yii\base\Component:private] => Array
            (
            )

        [_behaviors:yii\base\Component:private] => Array
            (
            )

    )
  )

好的，现在我要显示的只是这部分的数据：

[subcategory_id] => 1
[name] => ADJUDICATION ON BEHALF OF OR AGAINST AN INSOLVENT PARTY
[parent_id] => 2

当我收到变量 "data" 中返回的数据时，如何在 javascript 中实现此目的？

感谢您能给我的任何帮助

---

编辑:

这是我的控制器：

public function actionAjax() {
    if(isset($_POST['firstcategory'])) {
        $firstcategory = $_POST['firstcategory'];
        $subcategory = Subcategory::find()->all();
    } else {
        $firstcategory = "Ajax failed";
    }

    print_r($subcategory);
    exit;

    return \yii\helpers\Json::encode($subcategory);
}

---

第二次编辑:

我收到这个json

[
    {
        "subcategory_id": "1",
        "name": "ADJUDICATION ON BEHALF OF OR AGAINST AN INSOLVENT PARTY",
        "parent_id": "2"
    },
    {
        "subcategory_id": "2",
        "name": "THE EXISTENCE OF A CONTRACT",
        "parent_id": "3"
    },
    {
        "subcategory_id": "3",
        "name": "THE MEANING OF CONSTRUCTION CONTRACT",
        "parent_id": "3"
    },
    {
        "subcategory_id": "4",
        "name": "THE MEANING OF CONSTRUCTION OPERATIONS",
        "parent_id": "3"
    },
    {
        "subcategory_id": "5",
        "name": "EXCLUDED CONSTRUCTION OPERATIONS",
        "parent_id": "3"
    },
    {
        "subcategory_id": "6",
        "name": "EXCLUDED AGREEMENTS",
        "parent_id": "3"
    }
]

现在在我看来，我正在尝试解析它，但我不确定

success: function(data) {
    obj = JSON.parse(data);
    document.write(obj.subcategory_id);
}

这不起作用？

Answer 1

更改此行

$subcategory = Subcategory::find()->all();

至

$subcategory = Subcategory::find()->asArray()->all();

这将以数组格式给出结果集，然后您可以将其作为 json.

传递

然后在 ajax 成功后，解析 Json 结果。

var result = $.parseJSON(data);

for(var i=0; i<result.length; i++){
    alert(result[i].subcategory_id);
}