{"id":28,"date":"2019-03-15T09:44:45","date_gmt":"2019-03-15T09:44:45","guid":{"rendered":"https:\/\/www.magetop.com\/blog\/?p=28"},"modified":"2021-08-03T02:03:02","modified_gmt":"2021-08-03T02:03:02","slug":"how-to-create-events-observer-in-magento-2","status":"publish","type":"post","link":"https:\/\/www.magetop.com\/blog\/how-to-create-events-observer-in-magento-2\/","title":{"rendered":"How to Create Events and Observer in Magento 2"},"content":{"rendered":"\n

In this example we will should you How to create events in Magento 2<\/strong>, we only catch the event to show the word Magetop - Event<\/code> on the frontend so we should create an events.xml<\/code> file in etc\/frontend<\/code> folder.<\/p>\n\n\n\n

\"create<\/figure>\n\n\n\n

Overview of creating events in Magento 2<\/h2>\n\n\n\n
  • Step 1: Dispatch event<\/li>
  • Step 2: Create a event file: events.xml<\/li>
  • Step 3: Create Observer class<\/li>
  • Step 4: Flush cache and check the result<\/li><\/ul>\n\n\n\n

    Understand Catching and handling a event<\/h2>\n\n\n\n

    Magento use area definition to manage the store. We will have a frontend area and admin area. With the configuration file, they can be put in 3 places:<\/p>\n\n\n\n

    • Under etc\/<\/code> folder is the configuration which can be used in both admin and frontend.<\/li>
    • Under etc\/frontend<\/code> folder will be used for frontend area.<\/li>
    • Under etc\/adminhtml<\/code> folder will be used for admin area.<\/li><\/ul>\n\n\n\n

      The same with the event configuration file. You can create events configuration file for each area like this:<\/p>\n\n\n\n

      • Admin area: app\/code\/Magetop\/HelloWorld\/etc\/adminhtml\/events.xml<\/code><\/li>
      • Frontend area: app\/code\/Magetop\/HelloWorld\/etc\/frontend\/events.xml<\/code><\/li>
      • Global area: app\/code\/Magetop\/HelloWorld\/etc\/events.xml<\/code><\/li><\/ul>\n\n\n\n

        Step 1: Dispatch event<\/h2>\n\n\n\n

        Now we want to dispatch an magento 2 event list which allow other module can change the word displayed. We will change the controller like this:<\/p>\n\n\n\n

        File: app\/code\/Magetop\/HelloWorld\/Controller\/Index\/Test.php<\/code><\/p>\n\n\n\n

        Content would be:<\/p>\n\n\n

        \n<?php\nnamespace Magetop\\HelloWorld\\Controller\\Index;\n\nclass Test extends \\Magento\\Framework\\App\\Action\\Action\n{\n    public function execute()\n    {\n        $textDisplay = new \\Magento\\Framework\\DataObject(array('text' => 'Magetop'));\n        $this->_eventManager->dispatch('magetop_helloworld_display_text', ['magetop_text' => $textDisplay]);\n        echo $textDisplay->getText();\n        exit;\n    }\n}\n<\/pre><\/div>\n\n\n
        The dispatch method will receive 2 arguments: an unique event name and an array data. In this example, we add the data object to the event and call it back to display the text.<\/p>\n\n\n\n
        Step 2: Create a event file: events.xml<\/h2>\n\n\n\n
        File: app\/code\/Magetop\/HelloWorld\/etc\/frontend\/events.xml<\/code><\/p>\n\n\n
        \n<?xml version="1.0"?>\n<config xmlns:xsi="http:\/\/www.w3.org\/2001\/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event\/etc\/events.xsd">\n    <event name="magetop_helloworld_display_text">\n        <observer name="magetop_display_text" instance="Magetop\\HelloWorld\\Observer\\ChangeDisplayText" \/>\n    <\/event>\n<\/config>\n<\/pre><\/div>\n\n\n
        In this file, under config element, we define an event element with the name is the event name which was dispatch above. The class which will execute this event will be define in the observer element by instance attribute. The name of observer is used to identify this with other observers of this event.<\/p>\n\n\n\n
        With this events.xml<\/code> file, Magento will execute class Magetop<\/code>\\HelloWorld\\Observer\\ChangeDisplayText<\/code> whenever the dispatch method of this event was called on frontend area. Please note that, we place events.xml<\/code> in the frontend area, so if you dispatch that event in the admin area (like admin controller), it will not run.<\/p>\n\n\n\n
        Step 3: Create Observer class<\/h2>\n\n\n\n
        Now we will create a class to execute above event.<\/p>\n\n\n\n
        File: app\/code\/Magetop\/HelloWorld\/Observer\/ChangeDisplayText.php<\/code><\/p>\n\n\n
        \n<?php\nnamespace Magetop\\HelloWorld\\Observer;\n\nclass ChangeDisplayText implements \\Magento\\Framework\\Event\\ObserverInterface\n{\n\tpublic function execute(\\Magento\\Framework\\Event\\Observer $observer)\n\t{\n\t\t$displayText = $observer->getData('magetop_text');\n\t\techo $displayText->getText() . " - Event <\/br>";\n\t\t$displayText->setText('Execute event successfully.');\n\n\t\treturn $this;\n\t}\n}\n<\/pre><\/div>\n\n\n
        This class will implement the ObserverInterface<\/code> and declare the execute method. You can see this simple method to know how it work.<\/p>\n\n\n\n
        Step 4: Flush cache and check the result<\/h2>\n\n\n\n
        Let\u2019s flush cache and see the result.<\/p>\n\n\n\n
        It comes to the end of the tutorials: How to Create Events and Observer in Magento 2<\/strong><\/p>\n\n\n\n
        We hope this is useful blog for you.<\/p>\n\n\n\n
        Thank you for reading!<\/p>\n","protected":false},"excerpt":{"rendered":"
        In this example we will should you How to create a event in Magento 2, we only catch the event to show the word Magetop – Event on the frontend so we should create an events.xml file in etc\/frontend folder.<\/p>\n","protected":false},"author":1,"featured_media":30,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[30,31,33,34,27],"class_list":["post-28","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-magento-2-knowledge-base","tag-how-to-create-events-observer","tag-how-to-create-events-and-observer","tag-how-to-create-events-and-observer-in-magento-2","tag-magento-2-create-events-and-observer","tag-magento-2-knowledge"],"yoast_head":"\nHow to Create Events and Observer in Magento 2 - Magetop Blog<\/title>\n<meta name=\"description\" content=\"In this blog, we will show you How to Create Events & Observer in Magento 2. 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