After

$content = elgg_view('core/river/filter', array('selector' => $selector));

Add this

elgg_push_context('widgets');

$widgets = elgg_get_widgets(elgg_get_page_owner_entity()->getGUID(), "dashboard");

elgg_pop_context();

$myparams = array(
        'num_columns' => 2,
        'show_access' => true,
        'exact_match' => true,
        'show_add_widgets' => false,
    );

if(elgg_is_admin_logged_in()) {
$myparams .= array(
        'show_add_widgets' => true,
    );
}

$widgets = elgg_view_layout('widgets', $myparams);

$body = elgg_view_layout('one_column', array('content' => $widgets));

 

$params = array(
        'title' => $title,
        'content' =>  $body .$composer . $content . $activity,
        //'sidebar' => $sidebar,
        //'filter_context' => $page_filter,
        'class' => 'elgg-river-layout',
);


elgg_set_page_owner_guid(1);
$content = elgg_view_layout('two_sidebar', $params);

echo elgg_view_page($title, $content);

Thanks RvR, but there's another problem.

Before I edit the code: the "Add widget" button only appears for admin, not for all user. The widget appears but it doesn't work, nothing in content.

After I edit the code: the "Add widget" button appears, widget appears and works well, but the old widget column still appears.

As you can see in these images above, now I want to replace the box 2 by the box 1, and show the "Add widget" button for all user, not only admin. Thank you.

$myparams = array(
        'num_columns' => 2, //change on 'num_columns' => 1,
        'show_access' => true,
        'exact_match' => true,
        'show_add_widgets' => false,
    );

if(elgg_is_admin_logged_in()) { //change on if(elgg_is_logged_in()) {
$myparams .= array(
        'show_add_widgets' => true,
    );
}

Thank you RvR but it doesn't work. There's still two column, nothing changes. The column1 is within <div class="elgg-body elgg-main">, and the column2 is within <div class="elgg-sidebar-alt">. Can you help me, please?!

If you want to show your widgets on sidebar then try it:

I can't test it now but should be work

BTW, better if you'll make

views\default\pages\sidebar\widgets.php

with

elgg_push_context('dashboard');
elgg_push_context('widgets');
elgg_pop_context();
    $params = array(
        'exact_match' => true,
        'num_columns' => 1,
        'show_access' => false,
    );
$title = '';
$body = elgg_view_layout('widgets', $params);

echo elgg_view_module('aside', $title, $body);

then into aboving code change on

$sidebar = elgg_view(pages/sidebar/widgets);

$params = array(
        'title' => $title,
        'content' =>  $composer . $content . $activity,
         'sidebar' => $sidebar,
        //'filter_context' => $page_filter,
        'class' => 'elgg-river-layout',
);

Thanks RvR. I think I didn't provide enought information for you. I'm using Ultimate cool theme, and it uses two sidebar layout, so it has a sidebar on the left, and a sidebar_alt on the right.

First the widgets appear on the sidebar_alt div tag, but they don't work. After I change the code, they appear within both the body and the sidebar_alt tag.

I don't know how widget appears before I change my code. It still appears but doesn't work.

Beside that, there's a file named sidebar_alt.php in the folder mod\WISB\views\default\page\elements contents code below:

<?php
$homepage = "/dashboard";
$currentpage = $_SERVER['REQUEST_URI'];
if($homepage==$currentpage) {
echo "<strong><a href=\"../thanks\">Thanks</a></strong><br />
edit the sidebar for the dashboard in /mod/cool_theme/views/default/page/elements/sidebar_alt.php<br />
and enjoy";
}
?>

Hope you understand clearly my problem. I really confused about it.

You can change 'sidebar' on 'sidebar_alt'

$params = array(
        'title' => $title,
        'content' =>  $composer . $content . $activity,
      'sidebar_alt' => $sidebar,
        //'filter_context' => $page_filter,
        'class' => 'elgg-river-layout',
);

 

Or edit your sidebar_alt.php in mod\WISB\views\default\page\elements with

<?php

elgg_push_context('dashboard');
elgg_push_context('widgets');
elgg_pop_context();
    $params = array(
        'exact_match' => true,
        'num_columns' => 1,
        'show_access' => false,
    );
$title = '';
$body = elgg_view_layout('widgets', $params);

echo elgg_view_module('aside', $title, $body);

If this then no need to create views\default\pages\sidebar\widgets.php

Thanks RvR. I try and it still doesn't work. So complicated. Now the widget appears within the sidebar_alt tag, but it still doesn't work. You can see in the image below. I try all of what you said. I think we have to remove the old sidebar_alt but I don't know how to do that. Can you help me to fix it?

//Sorry for my bad English :D

Sounds like FB Theme's Issue with Widgets

I'll try your theme now. Wait my answer soon ;)