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What is Layout

A layout defines the visual structure of the user interface element, such as a page or a widget. In other words, a layout is a recursive system that knows how an element should be positioned and drawn.

Content of any page of an application is usually separated by a set of blocks grouped by content or structure.

Have a look at the following page structure:

Page layout structure example

Here, we are splitting the page into the following blocks hierarchy:

  • root
    • header
    • body
      • sidebar
      • main content
    • footer

Each of these blocks has children in the final structure, so they represent a container.

  • A Container is a block type responsible for holding and rendering its children.
  • A Final block is a block type that renders content based on data, but it cannot have children.

Each block has a type class that is responsible for passing options and data into view, and building the inner structure of the block into containers.

The layout should be built by providing a set of actions called a layot update. Layout updates can be defined for a specific route and a specific theme.

Block Types

The following are the block types to build HTML layout structure:

Type name Default HTML output
root <html>
head <head>
title <title>
meta <meta>
style <style> with content or <link> with external resource
script <script>
external_resource <link>
body <body>
form_start <form>
form_end </form>
form Creates three child blocks: form_start, form_fields, form_end
form_fields Adds form fields based on the Symfony form
form_field Block will be rendered differently depending on the field type of the Symfony form
fieldset <fieldset>
link <a>
list <ul>
ordered_list <ol>
list_item <li>, this block type can be used if you want to control rendering of the li tag and its attributes
text Text node
input Input node
button <button> or <input type=”submit/reset/button”>
button_group No HTML output. It is used for logical grouping of buttons. You can define how to render the button group in your application

Identify a Block for Customization

To locate a specific block and its template to customize the design or content in the storefront, use the Block Information Debugger OroCommerce development tool, as described below:

Note

You have to perform the following steps in the application development mode.

  1. Enable the block’s debug information in HTML source code of the storefront pages, as described in the Debug Layout Blocks topic.

    Once debug information is enabled, attributes data-layout-debug-block-id with the block ID and data-layout-debug-block-template with the block template file name are displayed in the root HTML tag of every layout block on the page.

  2. With browser development tools (or by browsing a storefront page HTML source code):

    • For the point you want to change, find the closest parent HTML node with the block id and block template data and note down their details for later. They contain the information about the main desired layout block.
    • Find the closest next HTML node after the point you want to change, which has such block information and note down its details for later. They contain information about the auxiliary desired layout block.
  3. Use the Layouts tab of the Symfony Profiler to find the stack of applicable template name prefixes for the blocks with retrieved IDs:

    1. Open the Layouts tab of the Symfony Profiler

    2. In the Layout Tree, find the blocks with the retrieved IDs.

    3. For each of the main and auxiliary blocks:

      • Click on the tree node with the block ID.

      • Expand the Variables section on the right side of the layout tree; it displays variables for selected block.

      • Find the block_prefixes variable. It contains a list of applicable block template prefixes sorted by priority in ascending order.

        It means that if there are two templates for the block in the application (the one with the last prefix on the list and the second with the next-to-last prefix), the template with the last prefix will be applied to the block.

  4. Open the block template files (discovered in the second step) for the main and auxiliary blocks.

  5. In the opened template files, locate the applied block template for both blocks.

    Starting from the end of block_prefixes list for block, for each block prefix:

    • Figure out the block template name for this prefix by concatenating the block prefix with a _widget suffix.
    • Search the block template with a figured template name in the opened template file.
    • If the file contains the searched template, you have found the desired block template responsible for the representation of the desired block.
    • If template file does not contain the template with a figured name, go to the next block prefix on the block_prefix list.
    • Repeat these steps until you find the block template. The block_prefix list must contain the prefix for the applied block template.
  6. At this step, you have found the templates for the main and auxiliary blocks.

    In most cases, the desired HTML markup is located in the main block template. In a rare cases, it may be located in the auxiliary block template.

Browse maintained versions:3.11.6
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