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• Extending Admin UI >
• 5. Creating a UDW tab

Step 5 - Creating a UDW tab

The Universal Discovery Widget (UDW) is a separate React module. By default it contains two tabs: Browse and Search.

In this step you will add a new tab called Images which will display all Content items of the type 'Image' using a gallery of thumbnails.

Tip

To be able to view the results of this step, create a few Content items of the type "Image".

Add a tab

First add a src/EzSystems/ExtendingTutorialBundle/Resources/public/js/add.tab.js which governs the creation of the new tab:

(function (global, eZ) {
    eZ = eZ || {};
    eZ.adminUiConfig = eZ.adminUiConfig || {};
    eZ.adminUiConfig.universalDiscoveryWidget = eZ.adminUiConfig.universalDiscoveryWidget || {};
    eZ.adminUiConfig.universalDiscoveryWidget.extraTabs = eZ.adminUiConfig.universalDiscoveryWidget.extraTabs || [];

    eZ.adminUiConfig.universalDiscoveryWidget.extraTabs.push({
        id: 'images',
        title: 'Images',
        iconIdentifier: 'image',
        panel: eZ.modules.ImagesPanel, // React component that represents content of a tab
        attrs: {}
    });

})(window, window.eZ);

The highlighted line indicates the actual panel inside the tab that will display the images.

Provide ReactJS development files

Next you need to provide a set of files that will later be compiled into the module:

• images.service.js handles fetching the data
• images.panel.js renders the panel inside the tab
• images.list.js renders the image list
• image.js renders a single image

Place all these files in src/EzSystems/ExtendingTutorialBundle/Resources/ui-dev/src:

images.service.js

const handleRequestResponse = response => {
    if (!response.ok) {
        throw Error(response.statusText);
    }

    return response.json();
};

export const getImages = ({token, siteaccess, contentId}, callback) => {
    const body = JSON.stringify({
        ViewInput: {
            identifier: 'images',
            public: false,
            LocationQuery: {
                Criteria: {},
                FacetBuilders: {},
                SortClauses: {},
                Filter: { ContentTypeIdCriterion: 5 }
            }
        }
    });
    const request = new Request('/api/ezp/v2/views', {
        method: 'POST',
        headers: {
            'Accept': 'application/vnd.ez.api.View+json; version=1.1',
            'Content-Type': 'application/vnd.ez.api.ViewInput+json; version=1.1',
            'X-Siteaccess': siteaccess,
            'X-CSRF-Token': token,
        },
        body,
        mode: 'cors',
    });

    fetch(request)
        .then(handleRequestResponse)
        .then(callback)
        .catch(error => console.log('error:load:images', error));
};

export const loadImageContent = ({token, siteaccess, contentId}, callback) => {
    const body = JSON.stringify({
        ViewInput: {
            identifier: `image-content-${contentId}`,
            public: false,
            ContentQuery: {
                Criteria: {},
                FacetBuilders: {},
                SortClauses: {},
                Filter: { ContentIdCriterion: contentId }
            }
        }
    });
    const request = new Request('/api/ezp/v2/views', {
        method: 'POST',
        headers: {
            'Accept': 'application/vnd.ez.api.View+json; version=1.1',
            'Content-Type': 'application/vnd.ez.api.ViewInput+json; version=1.1',
            'X-Siteaccess': siteaccess,
            'X-CSRF-Token': token,
        },
        body,
        mode: 'cors',
    });

    fetch(request)
        .then(handleRequestResponse)
        .then(callback)
        .catch(error => console.log('error:load:images', error));
};

images.panel.js

import React from 'react';
import ImagesList from './images.list';

const ImagesPanel = (props) => {
    const wrapperAttrs = {className: 'c-images-panel'};

    if (!props.isVisible) {
        wrapperAttrs.hidden = true;
    }

    return (
        <div {...wrapperAttrs}>
            <h1>Images panel</h1>
            <ImagesList {...props} />
        </div>
    );
};

export default ImagesPanel;

images.list.js

import React, { Component } from 'react';
import Image from './image';
import { getImages } from './images.service';
import './css/images.list.css';

class ImagesList extends Component {
    constructor(props) {
        super(props);

        this.updateImagesState = this.updateImagesState.bind(this);
        this.showPrevPage = this.showPrevPage.bind(this);
        this.showNextPage = this.showNextPage.bind(this);
        this.state = {
            images: [],
            page: 0,
            itemsPerPage: 5,
            maxPageIndex: 0
        };
    }

    componentDidMount() {
        getImages(this.props.restInfo, this.updateImagesState);
    }

    updateImagesState(response) {
        const images = response.View.Result.searchHits.searchHit.map(item => item.value.Location);
        const perPage = this.state.itemsPerPage;
        const modulo = images.length % perPage;
        const maxPageIndex = modulo ? (images.length - modulo) / perPage : images.length / perPage - 1;

        this.setState({ images, maxPageIndex });
    }

    showPrevPage() {
        this.setState(state => Object.assign({}, state, {
            page: state.page > 0 ? state.page - 1 : 0
        }));
    }

    showNextPage() {
        this.setState(state => Object.assign({}, state, {
            page: state.maxPageIndex > state.page ? state.page + 1 : state.maxPageIndex
        }));
    }

    renderItems() {
        const attrs = {
            className: 'c-images-list__items',
            style: {
                transform: `translate3d(-${this.state.page * this.state.itemsPerPage * 316}px, 0, 0)`
            }
        };

        return (
            <div className="c-images-list__items-wrapper">
                <div {...attrs}>
                    {this.state.images.map(imageLocation => <Image key={imageLocation.id} location={imageLocation} restInfo={this.props.restInfo}/>)}
                </div>
            </div>
        );
    }

    renderPrevBtn() {
        const attrs = {
            className: 'c-images-list__btn--prev',
            onClick: this.showPrevPage
        };

        if (this.state.page <= 0) {
            attrs.disabled = true;
        }

        return (
            <div {...attrs}>
                <svg className="ez-icon">
                    <use xlinkHref="/bundles/ezplatformadminui/img/ez-icons.svg#caret-back"></use>
                </svg>
            </div>
        );
    }

    renderNextBtn() {
        const attrs = {
            className: 'c-images-list__btn--next',
            onClick: this.showNextPage
        };

        if (this.state.page >= this.state.maxPageIndex) {
            attrs.disabled = true;
        }

        return (
            <div {...attrs}>
                <svg className="ez-icon">
                    <use xlinkHref="/bundles/ezplatformadminui/img/ez-icons.svg#caret-next"></use>
                </svg>
            </div>
        );
    }

    render() {
        return (
            <div className="c-images-list">
                {this.renderPrevBtn()}
                {this.renderItems()}
                {this.renderNextBtn()}
            </div>
        );
    }
}

export default ImagesList;

image.js

import React, { Component } from 'react';
import { loadImageContent } from './images.service';
import './css/image.css';

class Image extends Component {
    constructor(props) {
        super(props);

        this.updateVersionInfoState = this.updateVersionInfoState.bind(this);
        this.state = {
            content: null
        };
    }

    componentDidMount() {
        loadImageContent({ ...this.props.restInfo, contentId: this.props.location.ContentInfo.Content._id}, this.updateVersionInfoState);
    }

    updateVersionInfoState(response) {
        this.setState(state => Object.assign({}, state, {
            content: response.View.Result.searchHits.searchHit[0].value.Content
        }));
    }

    render() {
        let src = 'data:image/svg+xml;base64,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';
        let alt = 'Loading meta data ...';

        if (this.state.content) {
            const imageField = this.state.content.CurrentVersion.Version.Fields.field.find(field => field.fieldTypeIdentifier === 'ezimage').fieldValue;

            src = imageField.uri;
            alt = imageField.fileName;
        }

        return (
            <div className="c-image" data-title={alt} onClick={() => console.log(data)}>
                <img className="c-image__thumb" src={src} alt={alt} />
            </div>
        );
    }
}

export default Image;

Finally, ensure that the new tab is styled by adding the following two files to src/EzSystems/ExtendingTutorialBundle/Resources/ui-dev/src/css:

image.css

.c-image {
    width: 300px;
    height: 200px;
    background: #fff;
    transition: box-shadow .3s ease-in-out;
    position: relative;
    cursor: pointer;
    display: flex;
}

.c-image:before {
    content: attr(data-title);
    display: flex;
    background: rgba(0,0,0,.75);
    color: #fff;
    width: 300px;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    padding: 1rem;
    transition: opacity .3s ease-in-out;
    overflow: hidden;
}

.c-image:hover:before,
.c-image:focus:before {
    opacity: 1;
}

.c-image__thumb {
    display: block;
    max-width: 300px;
    max-height: 200px;
    width: auto;
    height: auto;
    margin: auto;
}

images.list.css

.c-images-list {
    display: grid;
    grid-template-areas: 'prev list next';
    grid-template-columns: 32px 1fr 32px;
    grid-gap: 16px;
    overflow: hidden;
}

.c-images-list__items-wrapper {
    overflow: hidden;
    max-width: 1564px;
}

[class*="c-images-list__btn--"] {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f15a10;
    transition: background .2s ease-in-out, opacity .2s ease-in-out;
}

[class*="c-images-list__btn--"]:focus,
[class*="c-images-list__btn--"]:hover {
    background: #ab3f0a;
}

[class*="c-images-list__btn--"][disabled],
[class*="c-images-list__btn--"][disabled]:focus,
[class*="c-images-list__btn--"][disabled]:hover {
    background: #f15a10;
    opacity: .5;
}

[class*="c-images-list__btn--"] .ez-icon {
    fill: #fff;
}

.c-images-list__btn--prev {
    grid-area: prev;
}

.c-images-list__btn--next {
    grid-area: next;
}

.c-images-list__items {
    grid-area: list;
    display: flex;
    flex-wrap: nowrap;
    transition: transform .3s ease-in-out;
}

.c-images-list__items .c-image {
    flex: 0 0 300px;
}

.c-images-list__items .c-image + .c-image {
    margin-left: 1rem;
}

Compile the files

Now you need to make the React module available (in umd version) in the window object in the browser.

Place the compiled files in src/EzSystems/ExtendingTutorialBundle/Resources/public/js/modules.

How to compile the React module

If you are not familiar with compiling React modules, you can use the following steps:

1. Copy the webpack.*.js, package.json, and .babelrc files from vendor/ezsystems/ezplatform-admin-ui-modules to src/EzSystems/ExtendingTutorialBundle/Resources/ui-dev.
2. Replace the existing modules in the entry property in webpack.common.js with ImagesPanel: './src/images.panel.js',.
3. In the terminal, in src/EzSystems/ExtendingTutorialBundle/Resources/ui-dev, run npm install.
4. Next, run npm run build.

Add configuration

Next, ensure that the React modules will be correctly initialized. To do this, add the following instructions to src/EzSystems/ExtendingTutorialBundle/Resources/config/services.yml. This adds JavaScript files into specific zones inside the built-in layout.html.twig file.

ReactJS modules (the compiled files) should be placed in the custom-admin-ui-modules group, and configuration in the custom-admin-ui-config group.

ezplatform.udw.image.panel.module.js:
    parent: EzSystems\EzPlatformAdminUi\Component\ScriptComponent
    arguments:
        $src: /bundles/ezsystemsextendingtutorial/js/modules/ImagesPanel.module.js
    tags:
        - { name: ezplatform.admin_ui.component, group: custom-admin-ui-modules }

ezplatform.udw.add.tab.js:
    parent: EzSystems\EzPlatformAdminUi\Component\ScriptComponent
    arguments:
        $src: /bundles/ezsystemsextendingtutorial/js/add.tab.js
    tags:
        - { name: ezplatform.admin_ui.component, group: custom-admin-ui-config }

Finally, make sure that the Symfony bundle configuration is imported. In src/EzSystems/ExtendingTutorialBundle/DependencyInjection add the following files:

Configuration.php

<?php

namespace EzSystems\ExtendingTutorialBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

/**
 * This is the class that validates and merges configuration from your app/config files.
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/configuration.html}
 */
class Configuration implements ConfigurationInterface
{
    /**
     * {@inheritdoc}
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('ez_systems_udw_tab_tutorial');

        // Here you should define the parameters that are allowed to
        // configure your bundle. See the documentation linked above for
        // more information on that topic.

        return $treeBuilder;
    }
}

EzSystemsExtendingTutorialExtension.php

<?php

namespace EzSystems\ExtendingTutorialBundle\DependencyInjection;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;

/**
 * This is the class that loads and manages your bundle configuration.
 *
 * @link http://symfony.com/doc/current/cookbook/bundles/extension.html
 */
class EzSystemsExtendingTutorialExtension extends Extension
{
    /**
     * {@inheritdoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.yml');
    }
}

Check results

Tip

If you cannot see the results or encounter an error, clear the cache and reload the application.

At this point you can go to the Back Office and choose Browse under Content/Content structure. In the UDW a new "Images" tab will appear, listing all Images from the Repository.