CRM-18286 - Use localStorage to remember datatable page length

js/Common.js

@@ -729,13 +729,18 @@ if (!CRM.vars) CRM.vars = {};
 
   $.fn.crmAjaxTable = function() {
     return $(this).each(function() {
-      //Declare the defaults for DataTables
+      // Recall pageLength for this table
+      var pageLength = 25;
+      if ($(this).data('ajax') && localStorage && localStorage['dataTablePageLength:' + $(this).data('ajax')]) {
+        pageLength = localStorage['dataTablePageLength:' + $(this).data('ajax')];
+      }
+      // Declare the defaults for DataTables
       var defaults = {
         "processing": true,
         "serverSide": true,
         "aaSorting": [],
         "dom": '<"crm-datatable-pager-top"lfp>rt<"crm-datatable-pager-bottom"ip>',
-        "pageLength": 25,
+        "pageLength": pageLength,
         "drawCallback": function(settings) {
           //Add data attributes to cells
           $('thead th', settings.nTable).each( function( index ) {
@@ -755,6 +760,12 @@ if (!CRM.vars) CRM.vars = {};
       };
       //Include any table specific data
       var settings = $.extend(true, defaults, $(this).data('table'));
+      // Remember pageLength
+      $(this).on('length.dt', function(e, settings, len) {
+        if (settings.ajax && localStorage) {
+          localStorage['dataTablePageLength:' + settings.ajax] = len;
+        }
+      });
       //Make the DataTables call
       $(this).DataTable(settings);
     });