fix(datagrid): prevent useless calls to row-loader

packages/oui-datagrid/src/datagrid.controller.js

@@ -119,7 +119,10 @@ export default class DatagridController {
         if (!angular.equals(this.previousRows, this.rows)) {
             this.previousRows = angular.copy(this.rows);
 
-            if (this.rows && this.paging) {
+            // Prevent recall this if there is no page change.
+            // this.paging.preventLoadingRows is true if there has been no page
+            // or page size change since last call.
+            if (this.rows && this.paging && !this.paging.preventLoadingRows) {
                 this.refreshData(() => this.paging.setRows(this.rows));
             }
         }

packages/oui-datagrid/src/paging/datagrid-local-paging.js

@@ -6,7 +6,6 @@ export default class DatagridLocalPaging extends DatagridPagingAbstract {
 
         this.rows = rows;
         this.rowLoader = rowLoader;
-
         this.totalCount = rows ? rows.length : 0;
     }
 
@@ -28,7 +27,15 @@ export default class DatagridLocalPaging extends DatagridPagingAbstract {
             }
         })
             .then(result => {
-                this.loadRowsData(result.data);
+                this.preventLoadingRows = true;
+                this.loadRowsData(result.data)
+                    .finally(() => {
+                        // Delay the change of the value to prevent $doCheck of DatagridController
+                        // calling refreshData for the last update.
+                        this.$timeout(() => {
+                            this.preventLoadingRows = false;
+                        });
+                    });
                 this.totalCount = result.meta.totalCount;
 
                 return result;

packages/oui-datagrid/src/paging/datagrid-paging-abstract.js

@@ -9,7 +9,10 @@ export default class DatagridPagingAbstract {
         this.rowLoader = rowLoader;
 
         this.$q = pagingService.$q;
+        this.$timeout = pagingService.$timeout;
         this.orderByFilter = pagingService.orderByFilter;
+
+        this.preventLoadingRows = false;
     }
 
     setOffset (offset) {
@@ -69,10 +72,10 @@ export default class DatagridPagingAbstract {
 
     loadRowsData (rows) {
         if (!this.rowLoader) {
-            return;
+            return this.$q.when();
         }
 
-        rows.forEach(row => this.loadRowData(row));
+        return this.$q.all(rows.map(row => this.loadRowData(row)));
     }
 
     loadRowData (row) {
@@ -83,9 +86,13 @@ export default class DatagridPagingAbstract {
                     delete row.$promise;
                 });
 
+            return row.$promise;
+
             // TODO: Find a way to forward those error to datagrid
             /* .catch(this.handleError.bind(this)) */
         }
+
+        return this.$q.when();
     }
 
     /**

packages/oui-datagrid/src/paging/datagrid-paging.service.js

@@ -2,10 +2,11 @@ import DatagridLocalPaging from "./datagrid-local-paging";
 import DatagridRemotePaging from "./datagrid-remote-paging";
 
 export default class {
-    constructor ($q, orderByFilter) {
+    constructor ($q, $timeout, orderByFilter) {
         "ngInject";
 
         this.$q = $q;
+        this.$timeout = $timeout;
         this.orderByFilter = orderByFilter;
     }