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Layout Subtree View 

The layout subtree is used to reload content of some layout block via Ajax request.

Initialization 

Layout update:

layout:
    actions:
        - '@addTree':
            ...
            tree:
                layout_block_id: ~

Add LayoutSubtreeView in block template:

{% block _layout_block_id_widget %}
    <div id="block_id"
        data-page-component-module="oroui/js/app/components/view-component"
        data-page-component-options="{{ {
            view: 'oroui/js/app/views/layout-subtree-view',
            blockId : id,
            reloadEvents: ['reload-on-event'],
            restoreFormState: true
        }|json_encode }}"
        >
        {{ block_widget(block) }}
    </div>
{% endblock %}

Or initialize in JavaScript:

var LayoutSubtreeView = require('oroui/js/app/views/layout-subtree-view');
var layoutSubtree = new LayoutSubtreeView({
    el: '#block_id',
    blockId: 'layout_block_id',
    reloadEvents: ['reload-on-event'],
    restoreFormState: true
});

//then call reload method
layoutSubtree.reloadLayout();

//or trigger reload event in other script
var mediator = require('oroui/js/mediator');
mediator.trigger('reload-on-event');