Page length datatable

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Page length datatable

lengthMenuOption (Type) (Default) (Example) 50 1 2 3 $$('#example').DataTable( { "pageLength": 50 } ); Options lengthChangeOption lengthMenuOption pagingOption API page()API ()API page.len()API Since: DataTables 1.10Change the initial page length (number of rows per page). DescriptionNumber of rows to display on a single page when using pagination. If lengthChange is feature enabled (it is by default) then the end user will be able to override the value set here to a custom setting using a pop-up menu (see lengthMenu). TypeThis option can be given in the following type(s): Default ExampleShow 50 records per page: $('#example').dataTable( { "pageLength": 50 } );RelatedThe following options are directly related and may also be useful in your application development.APIpage()()page.len()OptionslengthChangelengthMenupaging I'm trying to add pageLength to my datatables with ajax implementation but when I try to see the results, it returns a lot on the table instead of slicing the data for each page. Please see my code below. JS $('table.dataTableAjax').DataTable({ "processing": true, "serverSide": true, "paging": true, "pageLength": 50, "ajax": "..." }); I also tried the code below but still not working fine. "lengthMenu": [[10, 25, 50, -1], [10, 25, 50, "All"]] Example Data From Server Side { "data":[ { "name": "Bob" }, { "name": "Billy" } ] } In my server side, I'm throwing about 500+ data rows. So the current result is it returns all the 500+ table rows instead of 50 table rows each page. Answer It might be that you configured the serverSide property as "true" in the datatable configuration. If you enable it, the server should be responsible for limiting the number of rows that need to be sent. You can try disabling the serverSide option and see. $('table.dataTableAjax').DataTable({ "processing": true, "serverSide": false, "paging": true, "pageLength": 50, "ajax": "..." }); DataTables has a large number of initialization options, which make it very flexible to customize the table. You can write these options in a list in R, and datatable() will automatically convert them to JSON as needed by DataTables. The DT package modified the default behavior of DataTables in these aspects: The table is not ordered by default (DataTables orders a table by its first column by default); Ordered columns are not highlighted by default (the DataTables option orderClasses is changed from TRUE to FALSE); Numeric columns are always aligned to the right, since it rarely makes sense for numbers to be aligned to the left; The option autoWidth is set to FALSE by default, so that DataTables does not calculate and put hard-coded width values on the table columns; One known issue with autoWidth = FALSE is that the width option for columns will not work, so if you want to configure widths for columns, you have to use autoWidth = TRUE, e.g. datatable(..., options = list( autoWidth = TRUE, columnDefs = list(list(width = '200px', targets = c(1, 3))) )) When using the server-side processing mode, the option processing = TRUE is set as the default to show the processing indicator (DataTables' default is always FALSE); The option searchDelay is set to 1000 (1 second) by default; We can pass initialization options to datatable() via the options argument. For example, we center the 5th column in the table below1, and customize the length menu: datatable(head(iris, 20), options = list( columnDefs = list(list(className = 'dt-center', targets = 5)), pageLength = 5, lengthMenu = c(5, 10, 15, 20) )) The target column index is 5 but we actually centered the 6th column: the first column is row names, and the rest of columns are the iris data. The JavaScript index of the 6th column is 5. See the section "Display Row Names" for more details. # when rownames = FALSE, use 4 as the index of the Species column datatable(head(iris, 20), rownames = FALSE, options = list( columnDefs = list(list(className = 'dt-center', targets = 4)), pageLength = 5, lengthMenu = c(5, 10, 15, 20) )) When there are some options that you want to set for multiple tables produced from the same R session, you can use the global option named DT.options. For example: options(DT.options = list(pageLength = 5, language = list(search = 'Filter:'))) We can use the order option to specify how we want to order the rows. For example, we sort the table by columns 2 (ascending) and 4 (descending): datatable(head(mtcars, 30), options = list( order = list(list(2, 'asc'), list(4, 'desc')) )) By default, the table has these DOM elements: the length menu, the search box, the table, the information summary, and the pagination control. You can choose to display a subset of these elements using the dom option. Here are some examples: # only display the table, and nothing else datatable(head(iris), options = list(dom = 't')) # the filtering box and the table datatable(head(iris), options = list(dom = 'ft')) We can also customize the callbacks in DataTables options. For example, we use the initComplete callback function in options to change the background color of the table header to black after the initialization: datatable(head(iris, 20), options = list( initComplete = JS( "function(settings, json) {", "$(this.api().table().header()).css({'background-color': '#000', 'color': '#fff'});", "}") )) The function JS() tells R that this element is not an ordinary character vector, but literal JavaScript code, which will be evaluated in the web browser. We need this special function because there is no way to encode a JavaScript function in R (using jsonlite) and decode it in the browser. We can define a custom rendering function for particular columns in the option columnDefs. For example, we abbreviate character strings that are wider than 6 characters using the first 6 characters plus an ellipsis (...), and the full character string will be displayed as a tooltip when you mouse over the cell2: datatable(iris[c(1:20, 51:60, 101:120), ], options = list(columnDefs = list(list( targets = 5, render = JS( "function(data, type, row, meta) {", "return type === 'display' && data.length > 6 ?", "'' + data.substr(0, 6) + '...' : data;", "}") ))), callback = JS('table.page(3).draw(false);')) We used the callback argument in datatable() above, to navigate to the 4th page after the table is created. The index 3 in table.page(3) means the 4th page. Similarly, we can define how to render data in the rows using the rowCallback option. In the following example, we display some big numbers, format the 3rd column as currency, and order by this column: m = as.data.frame(matrix(round(rnorm(100, 1e5, 1e6)), 20)) datatable(m, options = list( rowCallback = JS( "function(row, data) {", "var num = '$' + data[3].toString().replace(/\\B(?=(\\d{3})+(?!\\d))/g, ',');", "$('td:eq(3)', row).html(num);", "}") ), callback = JS("table.order([3, 'asc']).draw();")) You need to learn JavaScript regular expressions to understand the above callback function. Basically, it means to add a comma after every 3 decimals, and add a prefix $ to the number. You should know data[2] means the 3rd element in the row now. Since it is common for users to format numbers in the data columns, we have provided a few simple helper functions (e.g. formatCurrency()) in this package to do these tasks in a much easier way, so you do not have to write the JavaScript code by yourself. When we enable the locker service, then the select box is not populating with the options i.e. no option is visible and its not there in dom as well 2 In this tutorial, we learn about How to set page length datatables. Setting options in page length select box jQuery datatables.

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