Instantiated at 1, it will increase by 1 every time a new tab is opened (a new page is instantiated) and decrease by 1 when a tab is closed (using beforeunload event handler). The idea is simple, we can keep count of the total number of tabs open in the browser for a specific domain. This means you can have multiple tabs open in the browser from let's say and they all share the same local storage. Local Storage in the browser is shared by the same domain. However, we can make use of local storage to achieve this. Unlike page reload, there is no standard way to detect whether the tab was closed or not. In case you are using JavaScript and not TypeScript, the only change would be the use of the arrow function in map. I went into good detail about why you shouldn't use loops in this article. NOTE: There are many reasons why we didn't use loops. You would want to put it within our beforeunload event handler. Just like that, now pageReloaded carries the boolean value of whether the page is reloaded or not. Let's code that let pageReloaded = window.performance We will avoid using loops for simplicity. Use the properties provided by the NavigationTiming API instead.īased on the documentation of NavigationTiming, we need to look for navigation type 'reload' within the array of navigation entry type. Please note that is deprecated and hence, you should avoid using that. Page reload can be identified using NavigationTiming API. Within that event handler, we need to identify whether the page was reloaded or not. When the event is triggered we do not know what triggered it (reload, tab close or browser close). We know so far, a page reload would also trigger beforeunload event. Angular Example for beforeunload event ) However, for most of the applications, we need to distinguish between a 'close' (tab or window) and a 'reload'. It is enough if you are looking for just that. This means this event will be triggered whenever the user either reloads the page, closes the tab or the browser window. This event is called whenever the resources are removed/unloaded from the client. JavaScript provides an event handler called beforeunload. If you are using another framework or JavaScript in general, the syntax would vary but the theory remains the same. The examples I will be showing below are using Angular 10. In this article, you will learn a way to detect page reload, tab close and browser close actions effectively and also distinguish between them. I was surprised to find that there is no straightforward way to do so. In JavaScript/TypeScript, however, there is no direct/standard way to identify whether the user has closed a tab and/or the browser window.
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