javascript 如何在 Ajax 请求中发送当前页码
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How to send current page number in Ajax request
提问by Narendra
I am using jQuery DataTable to display huge amount of data in a table. I am getting data page wise on Ajax request like this:
我正在使用 jQuery DataTable 在表格中显示大量数据。我在 Ajax 请求上获取数据页面，如下所示：
var pageNo = 1;
$('#propertyTable').dataTable( {
"processing": true,
"serverSide": true,
"ajax": "${contextPath}/admin/getNextPageData/"+pageNo+"/"+10,
"columns": [
{ "data": "propertyId" },
{ "data": "propertyname" },
{ "data": "propertyType" },
{ "data": "hotProperties" },
{ "data": "address" },
{ "data": "state" },
{ "data": "beds" },
{ "data": "city" },
{ "data": "zipCode" }
],
"fnDrawCallback": function () {
pageNo = this.fnPagingInfo().iPage+1;
alert(pageNo); // this alerts correct page
}
} );
and here is the spring controller:
这是弹簧控制器：
@RequestMapping(value="/getNextPageData/{pageNo}/{propertyPerPage}")
public @ResponseBody PropertyDatatableDto getNextPageData(@PathVariable Integer pageNo, @PathVariable Integer propertyPerPage) {
System.out.println("called");
System.out.println(pageNo); // this always prints 1, what i need is current pageNo here
PropertyDatatableDto datatableDto = new PropertyDatatableDto();
//datatableDto.setDraw(1);
datatableDto.setRecordsTotal(100);
datatableDto.setRecordsFiltered(100);
datatableDto.setData(adminService.getAllPropertyList());
return datatableDto;
}
The problem is that when I change page in table it alerts correct pageNoon page (in JavaScript), but in spring controller I am always getting the initial value assigned to the variable pageNoand not the current page number.
问题是，当我更改表格中的页面时，它会pageNo在页面上发出正确警报（在 JavaScript 中），但在 spring 控制器中，我总是得到分配给变量的初始值，pageNo而不是当前页码。
How do I pass pageNodynamically to spring controller? Any help is appreciated.
如何pageNo动态传递给弹簧控制器？任何帮助表示赞赏。
Edit:
编辑：
I updated JavaScript like this:
我像这样更新了 JavaScript：
var oSettings = $('#propertyTable').dataTable().fnSettings();
var currentPageIndex = Math.ceil(oSettings._iDisplayStart / oSettings._iDisplayLength) + 1;
$('#propertyTable').dataTable({
"processing": true,
"serverSide": true,
"ajax": "${contextPath}/admin/getNextPageData/"+currentPageIndex+"/"+10,
"columns": [
{ "data": "propertyId" },
{ "data": "propertyname" },
{ "data": "propertyType" },
{ "data": "hotProperties" },
{ "data": "address" },
{ "data": "state" },
{ "data": "beds" },
{ "data": "city" },
{ "data": "zipCode" }
]
});
But it's giving me an error:
但它给了我一个错误：
DataTables warning: table id=propertyTable - Cannot reinitialise DataTable.
DataTables 警告：table id=propertyTable - 无法重新初始化 DataTable。
回答by Gyrocode.com
DataTables already sends parameters startand lengthin the request that you can use to calculate page number, see Server-side processing.
DataTables 已经发送了参数，start并且length在您可以用来计算页码的请求中，请参阅服务器端处理。
If you still need to have the URL structure with the page number, you can use the code below:
如果你仍然需要有页码的 URL 结构，你可以使用下面的代码：
"ajax": {
"data": function(){
var info = $('#propertyTable').DataTable().page.info();
$('#propertyTable').DataTable().ajax.url(
"${contextPath}/admin/getNextPageData/"+(info.page + 1)+"/"+10
);
}
},
回答by SSA
"Untested" Edit: Added "retrieve": true in options to retrieve the table instance (v1.10), checked if table exists. Changed fnSettings to setting() for datatable v1.10.
“未测试”编辑：在检索表实例（v1.10）的选项中添加了“检索”：true，检查表是否存在。将数据表 v1.10 的 fnSettings 更改为 setting()。
You can try to read from the datatable settings and then from settings read _iDisplayStartand _iDisplayLength, then calculate current page index as follows:
您可以尝试从数据表设置中读取，然后从设置中读取_iDisplayStart和_iDisplayLength，然后按如下方式计算当前页面索引：
var currentPageIndex = 1;
//Is datatable already initialized?
if ( $.fn.DataTable.isDataTable( '#propertyTable' ) ) {
//Get the current settings and calculate current page index
var oSettings = $('#propertyTable').dataTable({"retrieve": true}).settings();
currentPageIndex = Math.ceil(oSettings._iDisplayStart / oSettings._iDisplayLength) + 1;
}
then in ajax call pass currentPageIndex:
然后在ajax调用中传递currentPageIndex：
"ajax": "${contextPath}/admin/getNextPageData/"+currentPageIndex +"/"+10,
