Allowed ability to set default sort_by/order on listings

- improved performance of listings (less refresh of items)
- fixed sorting issue where the order would not be reversed

assets/js/src/listing/header.jsx

@@ -1,98 +1,91 @@
-define([
-    'react',
-    'classnames',
-    'mailpoet'
-  ], function(
-    React,
-    classNames,
-    MailPoet
-  ) {
-
-  var ListingHeader = React.createClass({
-    handleSelectItems: function() {
-      return this.props.onSelectItems(
-        this.refs.toggle.checked
-      );
-    },
-    render: function() {
-      var columns = this.props.columns.map(function(column, index) {
-        column.is_primary = (index === 0);
-        column.sorted = (this.props.sort_by === column.name)
-          ? this.props.sort_order
-          : 'desc';
-        return (
-          <ListingColumn
-            onSort={this.props.onSort}
-            sort_by={this.props.sort_by}
-            key={ 'column-' + index }
-            column={column} />
-        );
-      }.bind(this));
-
-      var checkbox = false;
-
-      if(this.props.is_selectable === true) {
-        checkbox = (
-          <th
-            className="manage-column column-cb check-column">
-            <label className="screen-reader-text">
-              {MailPoet.I18n.t('selectAll')}
-            </label>
-            <input
-              type="checkbox"
-              name="select_all"
-              ref="toggle"
-              checked={ this.props.selection }
-              onChange={ this.handleSelectItems } />
-          </th>
-        );
-      }
+import MailPoet from 'mailpoet'
+import React from 'react'
+import classNames from 'classnames'
 
+const ListingHeader = React.createClass({
+  handleSelectItems: function() {
+    return this.props.onSelectItems(
+      this.refs.toggle.checked
+    );
+  },
+  render: function() {
+    const columns = this.props.columns.map(function(column, index) {
+      column.is_primary = (index === 0);
+      column.sorted = (this.props.sort_by === column.name)
+        ? this.props.sort_order
+        : 'desc';
       return (
-        <tr>
-          {checkbox}
-          {columns}
-        </tr>
+        <ListingColumn
+          onSort={this.props.onSort}
+          sort_by={this.props.sort_by}
+          key={ 'column-' + index }
+          column={column} />
       );
-    }
-  });
+    }.bind(this));
 
-  var ListingColumn = React.createClass({
-    handleSort: function() {
-      var sort_by = this.props.column.name,
-          sort_order = (this.props.column.sorted === 'asc') ? 'desc' : 'asc';
-      this.props.onSort(sort_by, sort_order);
-    },
-    render: function() {
-      var classes = classNames(
-        'manage-column',
-        { 'column-primary': this.props.column.is_primary },
-        { 'sortable': this.props.column.sortable },
-        this.props.column.sorted,
-        { 'sorted': (this.props.sort_by === this.props.column.name) }
-      );
-      var label;
+    let checkbox;
 
-      if(this.props.column.sortable === true) {
-        label = (
-          <a onClick={this.handleSort}>
-            <span>{ this.props.column.label }</span>
-            <span className="sorting-indicator"></span>
-          </a>
-        );
-      } else {
-        label = this.props.column.label;
-      }
-      return (
+    if(this.props.is_selectable === true) {
+      checkbox = (
         <th
-          className={ classes }
-          id={this.props.column.name }
-          scope="col"
-          width={ this.props.column.width || null }
-        >{label}</th>
+          className="manage-column column-cb check-column">
+          <label className="screen-reader-text">
+            {MailPoet.I18n.t('selectAll')}
+          </label>
+          <input
+            type="checkbox"
+            name="select_all"
+            ref="toggle"
+            checked={ this.props.selection }
+            onChange={ this.handleSelectItems } />
+        </th>
       );
     }
-  });
 
-  return ListingHeader;
+    return (
+      <tr>
+        {checkbox}
+        {columns}
+      </tr>
+    );
+  }
 });
+
+const ListingColumn = React.createClass({
+  handleSort: function() {
+    const sort_by = this.props.column.name;
+    const sort_order = (this.props.column.sorted === 'asc') ? 'desc' : 'asc';
+    this.props.onSort(sort_by, sort_order);
+  },
+  render: function() {
+    const classes = classNames(
+      'manage-column',
+      { 'column-primary': this.props.column.is_primary },
+      { 'sortable': this.props.column.sortable },
+      this.props.column.sorted,
+      { 'sorted': (this.props.sort_by === this.props.column.name) }
+    );
+    let label;
+
+    if(this.props.column.sortable === true) {
+      label = (
+        <a onClick={ this.handleSort }>
+          <span>{ this.props.column.label }</span>
+          <span className="sorting-indicator"></span>
+        </a>
+      );
+    } else {
+      label = this.props.column.label;
+    }
+    return (
+      <th
+        className={ classes }
+        id={this.props.column.name }
+        scope="col"
+        width={ this.props.column.width || null }
+      >{label}</th>
+    );
+  }
+});
+
+module.exports = ListingHeader;

assets/js/src/segments/list.jsx

@@ -244,6 +244,8 @@ const SegmentList = React.createClass({
           columns={ columns }
           bulk_actions={ bulk_actions }
           item_actions={ item_actions }
+          sort_by="name"
+          sort_order="asc"
         />
       </div>
     );

lib/Listing/Handler.php

@@ -27,8 +27,8 @@ class Handler {
       // searching
       'search' => (isset($data['search']) ? $data['search'] : null),
       // sorting
-      'sort_by' => (isset($data['sort_by']) ? $data['sort_by'] : 'id'),
-      'sort_order' => (isset($data['sort_order']) ? $data['sort_order'] : 'asc'),
+      'sort_by' => (!empty($data['sort_by']) ? $data['sort_by'] : 'id'),
+      'sort_order' => (!empty($data['sort_order']) ? $data['sort_order'] : 'asc'),
       // grouping
       'group' => (isset($data['group']) ? $data['group'] : null),
       // filters