javascript - jQuery DataTables Scroller Ajax 没有被第二次调用

Question

我正在使用 DataTables jQuery 插件。我在使用 Scroller plugin 时遇到问题。当滚动到达容器末尾时，它不会加载更多数据。

在 jQuery 中初始化:

 $("#data-table").dataTable({
    "bLengthChange": false,
    "paging": false,
    "scrollCollapse": true,
    "searching": false,
    "serverSide": true,
    "ordering": false,
    "ajax": {
        "url": CONST_WEB_SERVICE_URL + "GetData",
        "type": "POST"

    },
    "scroller": {
        "loadingIndicator": true,
        "trace": true
    },

    "deferRender": true,
    "dom": "lfrtipS",
    "scrollY": "400px"
   });

我的 .NET 网络服务 在 DataTables 首次读取时返回此 JSON 数据:

{
"draw": 1,
"data": [{
    "id": 1.0,
    "name": "88354b7e-c150-4985-b596-113fb3f9f591",
    "rating": 40.0,
    "votes": 1
}, {
    "id": 2.0,
    "name": "82f5243d-b68c-4306-a83b-7c5178661bab",
    "rating": 40.0,
    "votes": 2
}, {
    "id": 3.0,
    "name": "591c23cb-2ad6-472f-b347-96411bd7ca13",
    "rating": 40.0,
    "votes": 3
}, {
    "id": 4.0,
    "name": "cd7eed2e-f175-40c6-86ef-1ef26fdffe62",
    "rating": 40.0,
    "votes": 4
}, {
    "id": 5.0,
    "name": "46717542-a68a-48f9-92c7-21fbe94bbee6",
    "rating": 40.0,
    "votes": 5
}, {
    "id": 6.0,
    "name": "d73561ac-5885-4fc3-b9ed-2c672298c5e6",
    "rating": 40.0,
    "votes": 6
}, {
    "id": 7.0,
    "name": "6c18c250-c8e2-4e66-bb63-d13112cbbb4d",
    "rating": 40.0,
    "votes": 7
}, {
    "id": 8.0,
    "name": "3fefb6f7-a35b-44fe-b1be-7dc6cfe59f69",
    "rating": 40.0,
    "votes": 8
}, {
    "id": 9.0,
    "name": "7ba7d370-1250-4349-8228-4997b1c9d309",
    "rating": 40.0,
    "votes": 9
}, {
    "id": 10.0,
    "name": "56c15c4b-7617-4519-bfbe-aa82d78fd352",
    "rating": 40.0,
    "votes": 10
}, {
    "id": 11.0,
    "name": "7c2f49dc-9dad-4521-8a08-707ec60da31f",
    "rating": 40.0,
    "votes": 11
}, {
    "id": 12.0,
    "name": "2ca7d4dd-d1df-47dd-8001-e32e0fad0105",
    "rating": 40.0,
    "votes": 12
}, {
    "id": 13.0,
    "name": "7ccd94f1-63d7-4d39-8c75-940a3c687b52",
    "rating": 40.0,
    "votes": 13
}, {
    "id": 14.0,
    "name": "b3c24654-d27b-497d-bd75-fb3b1f675262",
    "rating": 40.0,
    "votes": 14
}, {
    "id": 15.0,
    "name": "68d28801-87c1-4f19-a96e-55b6a33fe609",
    "rating": 40.0,
    "votes": 15
}, {
    "id": 16.0,
    "name": "51c880c5-eb5d-41c2-8c07-960097d0f687",
    "rating": 40.0,
    "votes": 16
}, {
    "id": 17.0,
    "name": "518fd582-131e-47a2-ae8d-418650433c24",
    "rating": 40.0,
    "votes": 17
}, {
    "id": 18.0,
    "name": "6f9f132c-c70b-4a79-8316-c833003ff615",
    "rating": 40.0,
    "votes": 18
}, {
    "id": 19.0,
    "name": "bf189639-2e7a-49b3-86c7-5b6a2210635d",
    "rating": 40.0,
    "votes": 19
}, {
    "id": 20.0,
    "name": "035940bc-ab81-488d-9853-cab963841508",
    "rating": 40.0,
    "votes": 20
}, {
    "id": 21.0,
    "name": "1cb3b0a2-d03b-4792-b5a7-00cc1aeca33a",
    "rating": 40.0,
    "votes": 21
}, {
    "id": 22.0,
    "name": "7934e41d-759f-4903-97df-5f0c15547c43",
    "rating": 40.0,
    "votes": 22
}, {
    "id": 23.0,
    "name": "e2fe8827-0c02-49ee-9069-65f3349a2086",
    "rating": 40.0,
    "votes": 23
}, {
    "id": 24.0,
    "name": "0822288b-5df3-4aba-82fa-0a302eff5411",
    "rating": 40.0,
    "votes": 24
}, {
    "id": 25.0,
    "name": "e2b0f808-d0f7-4a80-bd06-4f34c63dcce6",
    "rating": 40.0,
    "votes": 25
}, {
    "id": 26.0,
    "name": "7fe22ed9-7629-4f23-8901-f5d328800c21",
    "rating": 40.0,
    "votes": 26
}, {
    "id": 27.0,
    "name": "18364942-bbbb-4c86-a310-5e256337c40d",
    "rating": 40.0,
    "votes": 27
}, {
    "id": 28.0,
    "name": "433e904f-bf1c-4375-bbf3-b8f78c337efa",
    "rating": 40.0,
    "votes": 28
}, {
    "id": 29.0,
    "name": "e55fe861-87d8-4377-91c7-914da0419fee",
    "rating": 40.0,
    "votes": 29
}, {
    "id": 30.0,
    "name": "30be927f-8584-47a5-be66-b4df8b4075e8",
    "rating": 40.0,
    "votes": 30
}, {
    "id": 31.0,
    "name": "8baaad43-7d1b-4abb-97c9-a81ba5e37dee",
    "rating": 40.0,
    "votes": 31
}, {
    "id": 32.0,
    "name": "00f4014f-cc81-47d4-bd12-af9b8c565b50",
    "rating": 40.0,
    "votes": 32
}, {
    "id": 33.0,
    "name": "225b4461-8740-45be-a094-9e747f9a7b07",
    "rating": 40.0,
    "votes": 33
}, {
    "id": 34.0,
    "name": "0e178b0f-35ec-40dc-850e-5cf84ff0bfbd",
    "rating": 40.0,
    "votes": 34
}, {
    "id": 35.0,
    "name": "e95c0aee-e525-4de0-addc-7b77a73df158",
    "rating": 40.0,
    "votes": 35
}, {
    "id": 36.0,
    "name": "0c3a2eab-307b-44fe-bcba-ce299cf734cf",
    "rating": 40.0,
    "votes": 36
}, {
    "id": 37.0,
    "name": "b0b0f894-c953-4560-8d6e-d13ce88541fb",
    "rating": 40.0,
    "votes": 37
}, {
    "id": 38.0,
    "name": "ebfb8188-fa1c-44e8-af98-ea254de85ab9",
    "rating": 40.0,
    "votes": 38
}, {
    "id": 39.0,
    "name": "1e726187-8214-4b44-926b-611e9fcb7f93",
    "rating": 40.0,
    "votes": 39
}, {
    "id": 40.0,
    "name": "cf298d6c-3858-4645-9ea5-a628d8335ce9",
    "rating": 40.0,
    "votes": 40
}, {
    "id": 41.0,
    "name": "3ce51eda-eff3-490a-94a5-09ae0ef4f6e0",
    "rating": 40.0,
    "votes": 41
}, {
    "id": 42.0,
    "name": "c0d5b03a-aecb-4a00-b9c9-b1febd4e6262",
    "rating": 40.0,
    "votes": 42
}, {
    "id": 43.0,
    "name": "6434056c-f682-40b3-a5c7-4a1bbfc45a6c",
    "rating": 40.0,
    "votes": 43
}, {
    "id": 44.0,
    "name": "b8e3adec-f9c4-424c-a09d-aee6563c251e",
    "rating": 40.0,
    "votes": 44
}, {
    "id": 45.0,
    "name": "666cea59-850c-45df-949f-4285d0ee9aa7",
    "rating": 40.0,
    "votes": 45
}, {
    "id": 46.0,
    "name": "d570807f-1aa8-44b8-8221-188cb550a743",
    "rating": 40.0,
    "votes": 46
}, {
    "id": 47.0,
    "name": "64b2353d-bea4-4fcc-b8cd-5dc5c897ac29",
    "rating": 40.0,
    "votes": 47
}, {
    "id": 48.0,
    "name": "c8082be2-92e0-4e26-9c66-0a487ed084a8",
    "rating": 40.0,
    "votes": 48
}, {
    "id": 49.0,
    "name": "4e4a1a01-aac0-41c0-934e-4fa1086cb82b",
    "rating": 40.0,
    "votes": 49
}, {
    "id": 50.0,
    "name": "b194d213-bdf9-4973-8264-f3a156ab5910",
    "rating": 40.0,
    "votes": 50
}],
"recordsTotal": 5000000,
"recordsFiltered": 5000000
}

我通过测试代码生成了这个结果。

DataTables读取recordsTotal，应该知道还有更多的数据需要读取。 数据正确显示在表格中，按照指定在 200 像素的容器中，但是当我滚动到末尾时，它不会启动对服务器的另一个 ajax 调用以检索更多数据。

为了让 Scroller 插件持续从服务器读取数据，我需要做哪些更改？

我尝试使用 paging: true 但没有成功。我在控制台中没有收到任何错误。

当我注释掉 bLengthChange 和 paging 时，分页有效，但滚动到底部不会启动对服务器的另一次调用以获取第二页。

Answer 1

您的初始化代码和数据存在一些潜在问题:

• 即使您在 JSON 响应中使用对象，也没有可用的列数据定义 (columns.data)。
• 如果您不使用分页 (p) 和长度更改控件 (l)，则不应在 dom 参数中指定它们。
• 数据格式正确，但要确保返回请求中给定的相同 draw 值和 length 参数中请求的记录数(参见 full list of request parameters) .

我认为正确的代码应该是这样的:

$("#data-table").dataTable({
    "scrollCollapse": true,
    "serverSide": true,
    "ordering": false,
    "searching": false,
    "ajax": {
        "url": CONST_WEB_SERVICE_URL + "GetData",
        "type": "POST"
    },
    "scroller": {
        "loadingIndicator": true
    },
    "deferRender": true,
    "dom": "rtiS",
    "scrollY": "400px",
    "columns": [
        {"data": "id"}, 
        {"data": "name"}, 
        {"data": 'rating'}, 
        {"data": 'votes'}
    ]
 });

示例见 this JSFiddle。我使用不同的 AJAX 函数只是为了模拟服务器端处理。