Understanding PrintJS JavaScript Functionality in Web Browsers
TL/DR –
The content provided is a complex block of JavaScript code. The code includes several functions related to browser functionalities and interactions such as handling print commands in different browsers, tracking user interactions and scrolling, handling popups, setting and getting cookies, managing event listeners, and adjusting newsletter block placements. The code also manipulates the Document Object Model (DOM) to show, hide, or modify certain elements. However, the content does not provide any data or arguments.
Optimizing PrintJS for Firefox, Internet Explorer, and Edge
PrintJS currently does not support PDF printing in Firefox, Internet Explorer, and Edge. In these browsers, the application opens the file in a new tab for printing. However, the application uses a different approach for each type of file with the use of the JavaScript Blob object and the Fetch API for remote files. The application has different modules for images, HTML, raw HTML, and JSON files.
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Setting Printable Content
The application sets the ‘printable’ content using a query selector. The application then listens for changes on Pinterest share buttons and adjusts them accordingly. The application also listens for click events on print share buttons and checks the user’s browser. If the user is using Firefox, the window’s print function is triggered. Else, the printJS function is triggered with the ‘printable’ content, type of content, targeted styles, and additional custom styles to hide certain elements during printing.
Displaying a Popup Modal
The application checks for a cookie with the key ‘popupShown’ or ‘hide_newsletter’. If either is present, the popup modal is not displayed. If the modal has a subscribe button, the application adds an event listener to it. When the button is clicked, a ‘hide_newsletter’ cookie is set. The application also listens for scroll events and calculates if the modal should be shown.
Adjusting Twitter Share Links
The application listens for changes to Twitter share links and adjusts their href attribute to a Bluesky URL. This helps to improve sharing functionality across different platforms.
Displaying Comment Count
The application fetches the number of comments for a post from the Discourse API and displays the count on a comment icon.
For more details about Bluesky, click here.
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